Publications (349)
The X-ray stream-eclipsing polar RX J1802.1+1804
J. Greiner, R. A. Remillard, C. Motch
We present X-ray and optical data of the newly discovered AM Her variable RX J1802.1+1804 = V884 Her. This X-ray source was observed in the ROSAT All-Sky-Survey in September 1990 a…
A gravitational-wave standard siren measurement of the Hubble constant
B. P. Abbott, R. Abbott, T. D. Abbott +1308
The detection of GW170817 in both gravitational waves and electromagnetic waves heralds the age of gravitational-wave multi-messenger astronomy. On 17 August 2017 the Advanced LIGO…
Multifrequency Observations of Gamma-Ray Burst
J. Greiner
Neither a flaring nor a quiescent counterpart to a gamma-ray burst has yet been convincingly identified at any wavelength region. The present status of the search for counterparts…
A quiescent galaxy at the position of the long GRB 050219A
A. Rossi, S. Piranomonte, S. Savaglio +25
Long-duration gamma-ray bursts (LGRBs) are produced by the collapse of very massive stars. Due to the short lifetime of their progenitors, LGRBs pinpoint star-forming galaxies. We…
The extraordinarily bright optical afterglow of GRB 991208 and its host galaxy
A. J. Castro-Tirado, V. V. Sokolov, J. Gorosabel +50
Observations of the extraordinarily bright optical afterglow (OA) of GRB 991208 started 2.1 d after the event. The flux decay constant of the OA in the R-band is -2.30 +/- 0.07 up…
V751 Cyg and V Sge as transient supersoft X-ray sources
J. Greiner
I review the observational evidence for luminous, soft X-ray emission during optical low-states in the two cataclysmic variables V751 Cyg and V Sge, and discuss the possible link t…
The X-shooter GRB afterglow legacy sample (XS-GRB)
J. Selsing, D. Malesani, P. Goldoni +53
In this work we present spectra of all -ray burst (GRB) afterglows that have been promptly observed with the X-shooter spectrograph until 31-03-2017. In total, we obtained spec…
On the constraining observations of the dark GRB 001109 and the properties of a z = 0.398 radio selected starburst galaxy contained in its error box
J. M. Castro Cerón, J. Gorosabel, A. J. Castro-Tirado +24
We present optical and NIR (near infrared) follow up observations of the GRB 001109 from 1 to 300 days after the burst. No transient emission was found at these wavelengths within…
DUAL Gamma-Ray Mission
S. Boggs, C. Wunderer, P. von Ballmoos +30
Gamma-ray astronomy presents an extraordinary scientific potential for the study of the most powerful sources and the most violent events in the Universe. In order to take full adv…
The Evolution of Swift/BAT blazars and the origin of the MeV background
M. Ajello, L. Costamante, R. M. Sambruna +8
We use 3 years of data from the Swift/BAT survey to select a complete sample of X-ray blazars above 15 keV. This sample comprises 26 Flat-Spectrum Radio Quasars (FSRQs) and 12 BL L…
Cosmology with XMM galaxy clusters: the X-CLASS/GROND catalogue and photometric redshifts
J. Ridl, N. Clerc, T. Sadibekova +11
The XMM Cluster Archive Super Survey (X-CLASS) is a serendipitously-detected X-ray-selected sample of 845 galaxy clusters based on 2774 XMM archival observations and covering appro…
Quasi-Periodic Pulsations in Solar Flares: new clues from the Fermi Gamma-Ray Burst Monitor
D. Gruber, P. Lachowicz, E. Bissaldi +14
In the last four decades it has been observed that solar flares show quasi-periodic pulsations (QPPs) from the lowest, i.e. radio, to the highest, i.e. gamma-ray, part of the elect…
An unusually massive stellar black hole in the Galaxy
J. Greiner, J. G. Cuby, M. J. McCaughrean
Here we report a measurement of the orbital period and mass function of GRS 1915+105 which allow us to deduce a mass of 14 +- 4 solar masses for its black hole. This large mass pro…
The Emergence of a Lanthanide-Rich Kilonova Following the Merger of Two Neutron Stars
N. R. Tanvir, A. J. Levan, C. Gonzalez-Fernandez +51
We report the discovery and monitoring of the near-infrared counterpart (AT2017gfo) of a binary neutron-star merger event detected as a gravitational wave source by Advanced LIGO/V…
Optical counterparts of ROSAT X-ray sources in two selected fields at low vs. high Galactic latitudes
J. Greiner, G. A. Richter
The optical identification of large number of X-ray sources such as those from the ROSAT All-Sky Survey is challenging with conventional spectroscopic follow-up observations. We in…
Swift and Chandra Detections of Supernova 2006jc: Evidence for Interaction of the Supernova Shock with a Circumstellar Shell
S. Immler, M. Modjaz, W. Landsman +20
The peculiar Type Ib supernova (SN) 2006jc has been observed with the UV/Optical Telescope (UVOT) and X-Ray Telescope (XRT) on board the Swift observatory over a period of 19 to 18…
UV and X-Ray Monitoring of AG Draconis During the 1994/1995 Outbursts
J. Greiner, K. Bickert, R. Luthardt +3
The recent 1994-1995 active phase of AG Draconis has given us for the first time the opportunity to follow the full X-ray behaviour of a symbiotic star during two successive outbur…
The optical/near-IR spectral energy distribution of the GRB 000210 host galaxy
J. Gorosabel, L. Christensen, J. Hjorth +25
We report on UBVRIZJsHKs-band photometry of the dark GRB 000210 host galaxy. Fitting a grid of spectral templates to its Spectral Energy Distribution (SED), we derived a photometri…
Dissecting accretion and outflows in accreting white dwarf binaries
D. de Martino, G. Sala, S. Balman +22
This is a White Paper in support of the mission concept of the Large Observatory for X-ray Timing (LOFT), proposed as a medium-sized ESA mission. We discuss the potential of LOFT f…
A large amplitude flaring dMe star in the 1978 October 6B -ray burst error box
J. Greiner, C. Motch
Spectroscopic observations provide evidence that the optical transient object observed in 1966 on archival plates of Sonneberg Observatory is a B=18.5 dMe star. For an assumed flar…
BL Lacertae objects beyond redshift 1.3 - UV-to-NIR photometry and photometric redshift for Fermi/LAT blazars
Arne Rau, P. Schady, J. Greiner +17
Observations of the gamma-ray sky with Fermi led to significant advances towards understanding blazars, the most extreme class of Active Galactic Nuclei. A large fraction of the po…
The metallicity and dust content of a redshift 5 gamma-ray burst host galaxy
M. Sparre, O. E. Hartoog, T. Krühler +26
Observations of the afterglows of long gamma-ray bursts (GRBs) allow the study of star-forming galaxies across most of cosmic history. Here we present observations of GRB 111008A f…
HV 2554 and the supersoft X-ray source RX J0527.8-6954
J. Greiner, M. L. Hazen
We have re-identified HV 2554 on plates of the Harvard College Observatory. Using photographic plates with higher sensitivity and spatial resolution taken within the EROS programme…
The late-time afterglow of the extremely energetic short burst GRB 090510 revisited
A. Nicuesa Guelbenzu, S. Klose, T. Kruehler +16
The discovery of the short GRB 090510 has raised considerable attention mainly because it had a bright optical afterglow and it is among the most energetic events detected so far w…
A near-infrared survey of the N49 region around the Soft Gamma-Ray Repeater 0526-66
S. Klose, A. A. Henden, U. Geppert +7
We report the results of a deep near-infrared survey with VLT/ISAAC of the environment of the supernova remnant N49 in the Large Magellanic Cloud, which contains the soft gamma-ray…
The very short supersoft X-ray state of the classical nova M31N 2007-11a
M. Henze, W. Pietsch, G. Sala +9
Short supersoft X-ray source (SSS) states (durations < 100 days) of classical novae (CNe) indicate massive white dwarfs that are candidate progenitors of supernovae type Ia. We car…
GRB 160410A: the first Chemical Study of the Interstellar Medium of a Short GRB
J. F. Agüà Fernández, C. C. Thöne, D. A. Kann +27
Short Gamma-Ray Bursts (SGRBs) are produced by the coalescence of compact binary systems which are remnants of massive stars. GRB 160410A is classified as a short-duration GRB with…
The Microchannel X-ray Telescope for the Gamma-Ray Burst mission SVOM
D. Gotz, J. Osborne, B. Cordier +17
We present the Microchannel X-ray Telescope, a new light and compact focussing telescope that will be flying on the Sino-French SVOM mission dedicated to Gamma-Ray Burst science. T…
Time-Resolved GRB Polarization with POLAR and GBM
J. Michael Burgess, M. Kole, F. Berlato +5
Simultaneous -ray measurements of gamma-ray burst (GRB) spectra and polarization offer a unique way to determine the underlying emission mechanism(s) in these objects as well a…
Nuclear Resonances: The quest for large column densities and a new tool
J. Greiner, S. E. Boggs, G. DiCocco +6
Nuclear physics offers us a powerful tool: using nuclear resonance absorption lines to infer the physical conditions in astrophysical settings which are otherwise difficult to dedu…
Soft X-ray emission of VY Scl stars during optical high state
J. Greiner
I have collected all available ROSAT observations of VY Scl stars including those during the all-sky survey to investigate the presence, strength and spectrum of soft X-ray emissio…
GRB 091029: At the limit of the fireball scenario
R. Filgas, J. Greiner, P. Schady +20
Using high-quality, broad-band afterglow data for GRB 091029, we test the validity of the forward-shock model for gamma-ray burst afterglows. We used multi-wavelength (NIR to X-ray…
PKS 2123-463: a confirmed gamma-ray blazar at high redshift
F. D'Ammando, A. Rau, P. Schady +11
The flat spectrum radio quasar (FSRQ) PKS 2123-463 was associated in the First Fermi-LAT source catalog with the gamma-ray source 1FGL J2126.1-4603, but when considering the full f…
A Photometric Redshift of z ~ 9.4 for GRB 090429B
A. Cucchiara, A. J. Levan, D. B. Fox +33
Gamma-ray bursts (GRBs) serve as powerful probes of the early Universe, with their luminous afterglows revealing the locations and physical properties of star forming galaxies at t…
Rapid ROSAT Observations of small Gamma-Ray Burst Error Boxes
J. Greiner
I summarize the use of the ROSAT satellite over the last months for the investigation of well localized GRB error boxes. In particular, I report about the attempts for and results…
A Gravitationally Lensed Quasar Discovered in OGLE
Z. Kostrzewa-Rutkowska, S. KozÅowski, C. Lemon +15
We report the discovery of a new gravitationally lensed quasar (double) from the Optical Gravitational Lensing Experiment (OGLE) identified inside the 670 sq. deg area encomp…
The Characteristics of Magnetic CVs in the Period Gap
G. Tovmassian, S. Zharikov, R. Mennickent +1
We have observed several magnetic cataclysmic variables located in the range between 2 and 3 hours, known as the period gap. This work was prompted by the recent discovery of RX J1…
The pre-eruption state of T CrB as observed with ALMA in 2024
D. Petry, G. Sala, I. El Mellah +2
T CrB is a nearby symbiotic binary and a recurrent nova with a period of ca. 80 years. The next eruption is expected to take place in 2025 or 2026. We present our pre-eruption obse…
New Parameters and Transit Timing Studies for OGLE2-TR-L9 b
M. Lendl, C. Afonso, J. Koppenhoefer +4
Context: Repeated observations of exoplanet transits allow us to refine the planetary parameters and probe them for any time dependent variations. In particular deviations of the p…
X-ray emission from the PSR B1259--63 system near apastron
J. Greiner, M. Tavani, T. Belloni
The PSR B1259--63 system contains a 47 ms radio pulsar in a highly eccentric binary with a Be-star companion. Strongly time variable X-ray emission was reported from this system as…
The Swift Gamma-Ray Burst Host Galaxy Legacy Survey - I. Sample Selection and Redshift Distribution
D. A. Perley, T. Krühler, S. Schulze +20
We introduce the Swift Gamma-Ray Burst Host Galaxy Legacy Survey ("SHOALS"), a multi-observatory high-redshift galaxy survey targeting the largest unbiased sample of long-duration…
The low-extinction afterglow in the solar-metallicity host galaxy of gamma-ray burst 110918A
J. Elliott, T. Krühler, J. Greiner +21
Metallicity is theoretically thought to be a fundamental driver in gamma-ray burst (GRB) explosions and energetics, but is still, even after more than a decade of extensive studies…
High resolution imaging of the X-ray afterglow of GRB970228 with ROSAT
F. Frontera, J. Greiner, L. A. Antonelli +6
We report results of a ROSAT High-Resolution Imager (HRI) observation of the X-ray error box given by the BeppoSAX Wide Field Camera for the gamma-ray burst that occurred on 1997 F…
Chandra Studies of the X-ray Point Source Luminosity Functions of M31
A. K. H. Kong, R. Di Stefano, M. R. Garcia +1
Three different M31 disk fields, spanning a range of stellar populations, were observed by Chandra. We report the X-ray point source luminosity function (LF) of each region, and th…
X-Ray, UV, and Optical Observations of Supernova 2006bp with Swift: Detection of Early X-Ray Emission
S. Immler, P. J. Brown, P. Milne +21
We present results on the X-ray and optical/UV emission from the type IIP SN 2006bp and the interaction of the SN shock with its environment, obtained with the X-Ray Telescope (XRT…
A new X-ray tidal disruption event candidate with fast variability
J. Hampel, S. Komossa, J. Greiner +3
During a close encounter between a star and a supermassive black hole, the star can get disrupted by the black hole's tidal forces, resulting in a tidal disruption event (TDE). The…
Galaxy Clusters in the Swift/BAT era: Hard X-rays in the ICM
M. Ajello, P. Rebusco, N. Cappelluti +6
We report about the detection of 10 clusters of galaxies in the ongoing Swift/BAT all-sky survey. This sample, which comprises mostly merging clusters, was serendipitously detected…
A real-time fast radio burst: polarization detection and multiwavelength follow-up
E. Petroff, M. Bailes, E. D. Barr +32
Fast radio bursts (FRBs) are one of the most tantalizing mysteries of the radio sky; their progenitors and origins remain unknown and until now no rapid multiwavelength follow-up o…
Evolution of the polarization of the optical afterglow of the gamma-ray burst GRB 030329
J. Greiner, S. Klose, K. Reinsch +23
We report 31 polarimetric observations of the afterglow of GRB 030329 with high signal-to-noise and high sampling frequency. We establish the polarization light curve, detect susta…
A proposed network of Gamma-ray Burst detectors on the Global Navigation Satellite System Galileo G2
J. Greiner, U. Hugentobler, J. M. Burgess +3
The accurate localization of gamma-ray bursts remains a crucial task. While historically, improved localization have led to the discovery of afterglow emission and the realization…
Hunting distant BL Lacs with the photometric technique using Swift and SARA
M. Rajagopal, A. Kaur, A. Ajello +5
BL Lacertae objects (BL Lacs) represent a large fraction (22\%) of gamma-ray sources in the Third Fermi Large Area Telescope catalog (3FGL). Nearly half of the BL Lac population re…
A long optical plateau in the afterglow of the Extended Emission short GRB 150424A: Evidence for energy injection by a magnetar?
F. Knust, J. Greiner, H. J. van Eerten +14
Short-duration GRBs with extended emission form a subclass of short GRBs, comprising about 15% of the short-duration sample. Afterglow detections of short GRBs are also rare (about…
Supplement: Localization and broadband follow-up of the gravitational-wave transient GW150914
B. P. Abbott, R. Abbott, T. D. Abbott +1538
This Supplement provides supporting material for arXiv:1602.08492 . We briefly summarize past electromagnetic (EM) follow-up efforts as well as the organization and policy of the c…
Evidence for diffuse molecular gas and dust in the hearts of gamma-ray burst host galaxies
J. Bolmer, C. Ledoux, P. Wiseman +17
Here we built up a sample of 22 GRBs at redshifts observed with X-shooter to determine the abundances of hydrogen, metals, dust, and molecular species. This allows us to st…
K band monitoring of GRS 1915+105 during 1999/2000
J. Greiner, F. J. Vrba, A. A. Henden +2
We report on long-term K band photometry of the galactic microquasar GRS 1915+105 since March 1999. We see variations of more than 1 mag, which are seemingly correlated with variat…
Optical and near-infrared observations of the GRB 970616 error box
J. Gorosabel, A. J. Castro-Tirado, H. Pedersen +7
We report on near-infrared and optical observations of the GRB 970616 error box and of the X-ray sources discovered by ASCA and ROSAT in the region. No optical transient was found…
A Supernova Candidate at z=0.092 in XMM-Newton Archival Data
G. Novara, P. Esposito, A. Tiengo +14
During a search for X-ray transients in the XMM-Newton archive within the EXTraS project, we discovered a new X-ray source that is detected only during a ~5 min interval of a ~21 h…
The Optical/NIR afterglow of GRB 111209A: Complex yet not Unprecedented
D. A. Kann, P. Schady, F. Olivares E. +24
Afterglows of Gamma-Ray Bursts (GRBs) are simple in the most basic model, but can show many complex features. The ultra-long duration GRB 111209A, one of the longest GRBs ever dete…
Multi-wavelength observations of 3FGL J2039.6-5618: a candidate redback millisecond pulsar
D. Salvetti, R. P. Mignani, A. De Luca +8
We present multi-wavelength observations of the unassociated gamma-ray source 3FGL J2039.6-5618 detected by the Fermi Large Area Telescope. The source gamma-ray properties suggest…
On the secondary star of the cataclysmic variable 1RXS J094432.1+035738
R. E. Mennickent, G. Tovmassian, S. V. Zharikov +4
We present V and Rc band photometry and optical near-infrared spectroscopy of the cataclysmic variable 1RXS J094432.1+035738. We detected features of a cool secondary star, which c…
The GROND gamma-ray burst sample. I. Overview and statistics
J. Greiner, T. Krühler, J. Bolmer +17
A dedicated gamma-ray burst (GRB) afterglow observing program was performed between 2007 and 2016 with GROND, a seven-channel optical and near-infrared imager at the 2.2m telescope…
The polarization evolution of the optical afterglow of GRB 030329
J. Greiner, S. Klose, K. Reinsch +23
We report 31 polarimetric observations of the afterglow of GRB 030329 with high signal-to-noise and high sampling frequency. The data imply that the afterglow magnetic field has sm…
Rapid follow-up ROSAT observation of GRB 940301
J. Greiner, N. Bade, K. Hurley +2
The strong GRB of March 1, 1994 was imaged by COMPTEL and found to have an identical location within the errors as a burst which occurred on July 4, 1993. This location coincidence…
Bright X-Ray Sources in M31 Globular Clusters
R. Di Stefano, A. K. H. Kong, M. R. Garcia +4
We have conducted Chandra observations of ~2560 square arcmin (~131 kpc^2) of of M31, and find that the most luminous X-ray sources in our fields are in globular clusters (GCs). Of…
The 60-month all-sky BAT Survey of AGN and the Anisotropy of Nearby AGN
M. Ajello, D. M. Alexander, J. Greiner +3
Surveys above 10 keV represent one of the the best resources to provide an unbiased census of the population of Active Galactic Nuclei (AGN). We present the results of 60 months of…
A strong optical flare before the rising afterglow of GRB 080129
J. Greiner, T. Krühler, S. McBreen +11
We report on GROND observations of a 40 sec duration (rest-frame) optical flare from GRB 080129 at redshift 4.349. The rise- and decay time follow a power law with indices +12 and…
Three X-ray transients in M31 observed with Swift
R. Voss, W. Pietsch, F. Haberl +5
The purpose of this study is to find transient X-ray sources in M31, and to investigate and classify their nature. Three X-ray transients were observed with Swift. For each of the…
Identification of the donor in GRS 1915+105
J. Greiner, M. J. McCaughrean, J. G. Cuby +2
We report on the results of medium-resolution spectroscopy of GRS 1915+105 in the H and K band using the 8m VLT at ESO. We clearly identify absorption bandheads from CO12 and CO13.…
Optical and near-infrared follow-up observations of four Fermi/LAT GRBs : Redshifts, afterglows, energetics and host galaxies
S. McBreen, T. Krühler, A. Rau +13
Fermi can measure the spectral properties of gamma-ray bursts over a very large energy range and is opening a new window on the prompt emission of these energetic events. Localizat…
A multi-wavelength investigation of candidate milli-second pulsars in unassociated -ray sources
D. Salvetti, R. P. Mignani, A. De Luca +7
About one third of the 3033 -ray sources in the Third Fermi-LAT Gamma-ray Source Catalogue (3FGL) are unidentified and do not have even a tentative association with a known obj…
Gamma-ray bursts with ROSAT
J. Greiner
I review the use of ROSAT over the last years for the investigation of well localized gamma-ray burst (GRB) error boxes. In particular, I cover (i) the systematic study of several…
The census of cataclysmic variables in the ROSAT Bright Survey
A. D. Schwope, H. Brunner, D. Buckley +5
We give an identification summary and results of polarimetric, photometric and spectroscopic follow-up observations of new, X-ray bright cataclysmic variables. These were identifie…
Identification of the donor in the X-ray binary GRS 1915+105
J. Greiner, J. G. Cuby, M. J. McCaughrean +2
We report on the results of medium-resolution spectroscopy of GRS 1915+105 in the near-infrared H and K band using the 8m VLT at ESO. We clearly identify absorption bandheads from…
New constraints on GRB jet geometry and relativistic shock physics
C. Guidorzi, C. G. Mundell, R. Harrison +23
We use high--quality, multi-band observations of Swift GRB120404A, from gamma-ray to radio frequencies, together with the new hydrodynamics code of van Eerten et al. (2012) to test…
Afterglow rebrightenings as a signature of a long-lasting central engine activity? The emblematic case of GRB 100814A
M. Nardini, J. Elliott, R. Filgas +12
In the past few years the number of well-sampled optical to NIR light curves of long Gamma-Ray Bursts (GRBs) has greatly increased particularly due to simultaneous multi-band image…
GRIPS - Gamma-Ray Burst Investigation via Polarimetry and Spectroscopy
J. Greiner
The primary scientific goal of the GRIPS mission is to revolutionize our understanding of the early universe using gamma-ray bursts. We propose a new generation gamma-ray observato…
GRIPS - The potential of a future MeV survey
J. Greiner, G. Kanbach, K. Mannheim
We describe the potential of GRIPS, a future MeV mission. The Gamma-Ray Imaging, Polarimetry and Spectroscopy ("GRIPS") concept combines a Compton and pair telescope, and will be a…
GRB 050502B optical afterglow: a jet break at high redshift
P. Afonso, J. Greiner, E. Pian +9
Aims: GRB 050502B is well known for the very bright flare displayed in its X-ray light curve. Despite extensive studies, however, the optical light curve has never been discussed a…
GROND - a 7-channel imager
J. Greiner, W. Bornemann, C. Clemens +19
We describe the construction of GROND, a 7-channel imager, primarily designed for rapid observations of gamma-ray burst afterglows. It allows simultaneous imaging in the Sloan g'r'…
BZ Cam during its 1999/2000 optical low state
J. Greiner, G. Tovmassian, M. Orio +6
We report optical observations of the VY Scl star BZ Cam during its previous optical low state in 1999/2000. We find drastic variations in the line profiles. Narrow-band imaging ob…
The redshift and afterglow of the extremely energetic gamma-ray burst GRB 080916C
J. Greiner, C. Clemens, T. Kruehler +22
The detection of GeV photons from gamma-ray bursts (GRBs) has important consequences for the interpretation and modelling of these most-energetic cosmological explosions. The full…
Supersoft X-ray sources in M31: II. ROSAT-detected supersoft sources in the ROSAT, Chandra and XMM eras
J. Greiner, R. DiStefano, A. Kong +1
We have performed Chandra observations during the past 3 years of 5 of the M31 supersoft X-ray sources (SSS) discovered with ROSAT. Surprisingly, only one of these sources has been…
Detailed optical and near-infrared polarimetry, spectroscopy and broadband photometry of the afterglow of GRB 091018: Polarisation evolution
K. Wiersema, P. A. Curran, T. Kruehler +30
[Abridged] A number of phenomena have been observed in GRB afterglows that defy explanation by simple versions of the standard fireball model, leading to a variety of new models. P…
Simultaneous optical/gamma-ray observations of GRB 121217's prompt emission
J. Elliott, H. -F. Yu, S. Schmidl +20
Since the advent of the Swift satellite it has been possible to obtain precise localisations of GRB positions of sub-arcsec accuracy within seconds, facilitating ground-based robot…
RX J0719.2+6557: A New Eclipsing Polar
G. Tovmassian, J. Greiner, F. -J. Zickgraf +4
A new magnetic, eclipsing cataclysmic variable is identified as the counterpart of the X-ray source RX J0719.2+6557 detected during the ROSAT all-sky survey. The relative phasing o…
Gas inflow and outflow in an interacting high-redshift galaxy: The remarkable host environment of GRB 080810 at
P. Wiseman, D. A. Perley, P. Schady +5
We reveal multiple components of an interacting galaxy system at through a detailed analysis of the exquisite high-resolution Keck/HIRES spectrum of the afterglow of…
GRB 100219A with X-shooter - abundances in a galaxy at z = 4.7
C. C. Thoene, J. P. U. Fynbo, P. Goldoni +24
Abundances of galaxies at redshifts z > 4 are difficult to obtain from damped Ly α (DLA) systems in the sightlines of quasars (QSOs) due to the Ly α forest blanketing and the low…
Search for GRB X-ray afterglows in the ROSAT all-sky survey
J. Greiner, D. H. Hartmann, W. Voges +3
We describe a search for X-ray afterglows from gamma-ray bursts using the ROSAT all-sky survey (RASS) data. If the emission in the soft X-ray band is significantly less beamed than…
The circumburst density profile around GRB progenitors: a statistical study
S. Schulze, S. Klose, G. Björnsson +6
According to our present understanding, long GRBs originate from the collapse of massive stars while short bursts are due to the coalescence of compact stellar objects. Since the a…
GRB 120422A/SN 2012bz: Bridging the Gap between Low- And High-Luminosity GRBs
S. Schulze, D. Malesani, A. Cucchiara +62
At low redshift, a handful of gamma-ray bursts (GRBs) have been discovered with peak luminosities () substantially lower than the average…
RXTE observations of GRS 1915+105
J. Greiner, E. H. Morgan, R. A. Remillard
The galactic superluminal motion source GRS 1915+105 was observed with RXTE at several occasions during its ongoing active state. The observed X-ray intensity changes drastically o…
SDSS J102623.61+254259.5: the second most distant blazar at z=5.3
T. Sbarrato, G. Ghisellini, M. Nardini +7
The radio-loud quasar SDSS J102623.61+254259.5, at a redshift z=5.3, is one of the most distant radio-loud objects. Since its radio flux exceeds 100 mJy at a few GHz, it is also on…
The unpolarized macronova associated with the gravitational wave event GW170817
S. Covino, K. Wiersema, Y. Z. Fan +37
The merger of two dense stellar remnants including at least one neutron star (NS) is predicted to produce gravitational waves (GWs) and short duration gamma ray bursts (GRBs). In t…
X-Ray Observations of GRS 1915+105
J. Greiner, B. A. Harmon, W. S. Paciesas +2
A comparison of ROSAT observations with simultaneous BATSE monitoring data shows a different intensity evolution in the soft and hard X-ray band of GRS 1915+105 since 1992. In addi…
New High-z Fermi BL Lacs with the Photometric Dropout Technique
A. Kaur, A. Rau, M. Ajello +6
Determining redshifts for BL Lacertae (BL Lac) objects using the traditional spectroscopic method is challenging due to the absence of strong emission lines in their optical spectr…
New light on gamma-ray burst host galaxies with Herschel
L. K. Hunt, E. Palazzi, M. J. MichaÅowski +17
Until recently, dust emission has been detected in very few host galaxies of gamma-ray bursts (GRBHs). With Herschel, we have now observed 17 GRBHs up to redshift z~3 and detected…
Massive stars exploding in a He-rich circumstellar medium. V. Observations of the slow-evolving SN Ibn OGLE-2012-SN-006
A. Pastorello, L. Wyrzykowski, S. Valenti +36
We present optical observations of the peculiar Type Ibn supernova (SN Ibn) OGLE-2012-SN-006, discovered and monitored by the OGLE-IV survey, and spectroscopically followed by PESS…
GRB 151027B - large-amplitude late-time radio variability
J. Greiner, J. Bolmer, M. Wieringa +20
Deriving physical parameters from gamma-ray burst afterglow observations remains a challenge, even now, 20 years after the discovery of afterglows. The main reason for the lack of…
On the Afterglow of the X-Ray Flash of July 23 2003: Photometric evidence for an off-axis Gamma-Ray Burst with an associated Supernova?
J. P. U. Fynbo, J. Sollerman, J. Hjorth +31
We present optical and near-infrared follow-up observations of the X-Ray Flash (XRF) of July 23 2003. Our observations in the R-band cover the temporal range from 4.2 h to 64 days…
Multi-color observations of short GRB afterglows: 20 events observed between 2007 and 2010
A. Nicuesa Guelbenzu, S. Klose, J. Greiner +18
We report on follow-up observations of 20 short-duration gamma-ray bursts performed in g'r'i'z'JHKs with the seven-channel imager GROND between mid-2007 and the end of 2010. This i…