Publications (48)
High-redshift GRB 140304A at z = 5.282 with flaring activity: A multi-wavelength study
Shashi. B. Pandey, Amit. K. Ror, A. J. Castro-Tirado +48
Context. This article presents a detailed multi-wavelength analysis of GRB 140304A at z = 5.282, having uncommon late-time flaring features. The aim is to study GRB 140304A and oth…
Happy Birthday Swift: Ultra-long GRB141121A and its broad-band Afterglow
A. Cucchiara, P. Veres, A. Corsi +27
We present our extensive observational campaign on the Swift-discovered GRB141121A, al- most ten years after its launch. Our observations covers radio through X-rays, and extends f…
COLIBRI (SVOM/FM-GFT): Instrumentation and Performances on the SVOM Alerts
S. Basa, W. H. Lee, A. M. Watson +71
COLIBRI, the French Mexican Ground Followup Telescope (FM GFT) for SVOM, is a 1.3 meter rapid response optical facility specifically developed for prompt, multiband observations of…
VLBI observations of SN 2008iz: I. Expansion velocity and limits on anisotropic expansion
A. Brunthaler, I. Marti-Vidal, K. M. Menten +9
We present observations of the recently discovered supernova 2008iz in M82 with the VLBI High Sensitivity Array at 22 GHz, the Very Large Array at frequencies of 1.4, 4.8, 8.4, 22…
Automating Discovery and Classification of Transients and Variable Stars in the Synoptic Survey Era
J. S. Bloom, J. W. Richards, P. E. Nugent +10
The rate of image acquisition in modern synoptic imaging surveys has already begun to outpace the feasibility of keeping astronomers in the real-time discovery and classification l…
Towards a Real-time Transient Classification Engine
J. S. Bloom, D. L. Starr, N. R. Butler +4
Temporal sampling does more than add another axis to the vector of observables. Instead, under the recognition that how objects change (and move) in time speaks directly to the phy…
Multi-epoch afterglow rebrightenings in GRB 250129A: Evidence for successive shock interactions
D. Akl, S. Antier, H. Koehn +105
Most long gamma-ray bursts (GRBs) exhibit afterglows broadly consistent with external forward-shock emission, typically described by smooth broken power-law decays in the multiband…
Deciphering the unusual stellar progenitor of GRB 210704A
R. L. Becerra, E. Troja, A. M. Watson +16
GRB~210704A is a burst of intermediate duration (~s) followed by a fading afterglow and an optical excess that peaked about 7 days after the explosion. Its propert…
DDOTI Observations of Gravitational-Wave Sources Discovered in O3
R. L. Becerra, S. Dichiara, A. M. Watson +8
We present optical follow-up observations with the DDOTI telescope of gravitational-wave events detected during the Advanced LIGO and Advanced Virgo O3 observing run. DDOTI is capa…
Optical and near-infrared observations of SN 2013dx associated with GRB 130702A
V. L. Toy, S. B. Cenko, J. M. Silverman +33
We present optical and near-infrared light curves and optical spectra of SN 2013dx, associated with the nearby (redshift 0.145) gamma-ray burst GRB 130702A. The prompt isotropic ga…
The Exceptionally Luminous Type II-L SN 2008es
A. A. Miller, R. Chornock, D. A. Perley +11
We report on our early photometric and spectroscopic observations of the extremely luminous Type II supernova (SN) 2008es. With an observed peak optical magnitude of m_V = 17.8 and…
The Troublesome Broadband Evolution of GRB 061126: Does a Grey Burst Imply Grey Dust?
D. A. Perley, J. S. Bloom, N. R. Butler +18
We report on observations of a gamma-ray burst (GRB 061126) with an extremely bright (R ~ 12 mag at peak) early-time optical afterglow. The optical afterglow is already fading as a…
Identifying high-redshift GRBs with RATIR
O. M. Littlejohns, N. R. Butler, A. Cucchiara +16
We present a template fitting algorithm for determining photometric redshifts, , of candidate high-redshift gamma-ray bursts (GRBs). Using afterglow photometry, obtai…
GRB 071003: Broadband Follow-up Observations of a Very Bright Gamma-Ray Burst in a Galactic Halo
D. A. Perley, W. Li, R. Chornock +26
The optical afterglow of long-duration GRB 071003 is among the brightest yet to be detected from any GRB, with R ~ 12 mag in KAIT observations starting 42 s after the GRB trigger,…
GRB 241030A: a bright afterglow challenging forward shock emission
J. -G. Ducoin, C. Pellouin, V. Aivazyan +97
Gamma-Ray Burst GRB 241030A (z = 1.411) exhibited a bright afterglow (similar to GRB 221009A), detected across gamma-ray, X-ray, UV, and optical bands, providing a probe of GRB aft…
High Resolution Gratings Spectroscopy of GRBs 030382 and 041006 with Chandra LETGS
N. R. Butler, G. R. Ricker, P. G. Ford +5
We present high resolution X-ray spectroscopy of two recent GRB afterglows observed with the Low Energy Transmission Gratings on Chandra. The afterglows to GRBs 030328 and 041006 a…
High Energy Observations of XRF 030723: Evidence for an Off-axis Gamma-Ray Burst?
N. R. Butler, T. Sakamoto, M. Suzuki +34
We report High Energy Transient Explorer 2 (HETE-2) Wide Field X-ray Monitor/French Gamma Telescope observations of XRF030723 along with observations of the XRF afterglow made usin…
A structured jet explains the extreme GRB 221009A
B. O'Connor, E. Troja, G. Ryan +29
Long duration gamma-ray bursts (GRBs) are powerful cosmic explosions, signaling the death of massive stars. Among them, GRB 221009A is by far the brightest burst ever observed. Due…
The central engine of GRB 130831A and the energy breakdown of a relativistic explosion
M. De Pasquale, S. R. Oates, J. L. Racusin +37
Gamma-ray bursts (GRBs) are the most luminous explosions in the universe, yet the nature and physical properties of their energy sources are far from understood. Very important clu…
When Do Internal Shocks End and External Shocks Begin? Early-Time Broadband Modelling of GRB 051111
N. R. Butler, W. Li, D. Perley +18
Even with the renaissance in gamma-ray burst (GRB) research fostered by the Swift satellite, few bursts have both contemporaneous observations at long wavelengths and exquisite obs…
The Luminous Infrared Host Galaxy of Short-Duration GRB 100206A
Daniel A. Perley, M. Modjaz, A. N. Morgan +5
The known host galaxies of short-hard gamma-ray bursts (GRBs) to date are characterized by low to moderate star-formation rates and a broad range of stellar masses. In this paper,…
The Afterglows of Swift-era Gamma-Ray Bursts II.: Type I GRB versus Type II GRB Optical Afterglows
D. A. Kann, S. Klose, B. Zhang +21
We use a large sample of GRB afterglow and prompt-emission data (adding further GRB afterglow observations in this work) to compare the optical afterglows (or the lack thereof) of…
Monster in the Dark: The Ultraluminous GRB 080607 and its Dusty Environment
Daniel A. Perley, A. N. Morgan, A. Updike +17
We present early-time optical through infrared photometry of the bright gamma-ray burst GRB 080607, starting only 6 s following the initial trigger in the rest frame. Complemented…
The early afterglow of GRB 190829A
S. Dichiara, E. Troja, V. Lipunov +19
GRB 190829A at z=0.0785 is the fourth closest long GRB ever detected by the Neil Gehrels Swift observatory, and the third confirmed case with a very high energy component. We prese…
Constraints on the electromagnetic counterpart of the Neutron Star Black Hole merger GW200115
S. Dichiara, R. L. Becerra, E. A. Chase +10
We report the results of our follow-up campaign for the neutron star - black hole (NSBH) merger GW200115 detected during the O3 run of the Advanced LIGO and Advanced Virgo detector…
Investigating signatures of cosmological time dilation in duration measures of prompt gamma-ray burst light curves
O. M. Littlejohns, N. R. Butler
We study the evolution with redshift of three measures of gamma-ray burst (GRB) duration (, and ) in a fixed rest frame energy band for a samp…
The Optical Two and Three-Dimensional Fundamental Plane Correlations for Nearly 180 Gamma-Ray Burst Afterglows with Swift/UVOT, RATIR, and the SUBARU Telescope
Maria Giovanna Dainotti, Sam Young, L. Li +21
Gamma-ray bursts (GRBs) are fascinating events due to their panchromatic nature. We study optical plateaus in GRB afterglows via an extended search into archival data. We comprehen…
GRB 191016A: The onset of the forward shock and evidence of late energy injection
M. Pereyra, N. Fraija, A. M. Watson +13
We present optical and near-infrared photometric observations of GRB 191016 with the COATLI, DDOTI and RATIR ground-based telescopes over the first three nights. We present the tem…
Photometric Observations of Supernova 2013cq Associated with GRB 130427A
R. L. Becerra, A. M. Watson, W. H. Lee +18
We observed the afterglow of GRB 130427A with the RATIR instrument on the 1.5-m Harold L. Johnson telescope of the Observatorio Astronómico Nacional on Sierra San Pedro Mártir. O…
An Optical Gamma-Ray Burst Catalogue with Measured Redshift PART I: Data Release of 535 Gamma-Ray Bursts and Colour Evolution
M. G. Dainotti, B. De Simone, R. F. Mohideen Malik +49
We present the largest optical photometry compilation of Gamma-Ray Bursts (GRBs) with redshifts (). We include 64813 observations of 535 events (including upper limits) from 28…
A long-lived neutron star merger remnant in GW170817: constraints and clues from X-ray observations
L. Piro, E. Troja, B. Zhang +12
Multi-messenger observations of GW170817 have not conclusively established whether the merger remnant is a black hole (BH) or a neutron star (NS). We show that a long-lived magneti…
Afterglow Observations of Fermi-LAT Gamma-Ray Bursts and the Emerging Class of Hyper-Energetic Events
S. B. Cenko, D. A. Frail, F. A. Harrison +21
We present broadband (radio, optical, and X-ray) light curves and spectra of the afterglows of four long-duration gamma-ray bursts (GRBs 090323, 090328, 090902B, and 090926A) detec…
GRB 080503: Implications of a Naked Short Gamma-Ray Burst Dominated by Extended Emission
D. A. Perley, B. D. Metzger, J. Granot +22
We report on observations of GRB 080503, a short gamma-ray burst with very bright extended emission (about 30 times the gamma-ray fluence of the initial spike) in conjunction with…
The Afterglows of Swift-era Gamma-Ray Bursts. I. Comparing pre-Swift and Swift era Long/Soft (Type II) GRB Optical Afterglows
D. A. Kann, S. Klose, B. Zhang +73
We have gathered optical photometry data from the literature on a large sample of Swift-era gamma-ray burst (GRB) afterglows including GRBs up to September 2009, for a total of 76…
SN 2008iy: An Unusual Type IIn Supernova with an Enduring 400 Day Rise Time
A. A. Miller, J. M. Silverman, N. R. Butler +9
We present spectroscopic and photometric observations of the Type IIn supernova (SN) 2008iy. SN 2008iy showed an unprecedentedly long rise time of ~400 days, making it the first SN…
The Host Galaxies of Swift Dark Gamma-Ray Bursts: Observational Constraints on Highly Obscured and Very High-Redshift GRBs
D. A. Perley, S. B. Cenko, J. S. Bloom +13
In this work we present the first results of our imaging campaign at Keck Observatory to identify the host galaxies of "dark" gamma-ray bursts (GRBs), events with no detected optic…
Refined Astrometry and Positions for 179 Swift X-ray Afterglows
N. R. Butler
We present a refined catalog for the positions of 179 Gamma-ray burst (GRB) X-ray afterglows observed by the X-ray Telescope (XRT) on Swift prior to November 1, 2006. The positions…
The X-ray counterpart to the gravitational wave event GW 170817
E. Troja, L. Piro, H. van Eerten +31
A long-standing paradigm in astrophysics is that collisions- or mergers- of two neutron stars (NSs) form highly relativistic and collimated outflows (jets) powering gamma-ray burst…
Evidence for Supernova-Synthesised Dust from the Rising Afterglow of GRB 071025 at z~5
Daniel A. Perley, J. S. Bloom, C. R. Klein +21
We present observations and analysis of the broadband afterglow of Swift GRB 071025. Using optical and infrared (RIYJHK) photometry, we derive a photometric redshift of 4.4 < z < 5…
Constraining GRB Emission Physics with Extensive Early-Time, Multiband Follow-up
A. Cucchiara, S. B. Cenko, J. S. Bloom +21
Understanding the origin and diversity of emission processes responsible for Gamma-ray Bursts (GRBs) remains a pressing challenge. While prompt and contemporaneous panchromatic obs…
A search for optical and near-infrared counterparts of the compact binary merger GW190814
A. L. Thakur, S. Dichiara, E. Troja +29
We report on our observing campaign of the compact binary merger GW190814, detected by the Advanced LIGO and Advanced Virgo detectors on August 14th, 2019. This signal has the best…
The Collimation and Energetics of the Brightest Swift Gamma-Ray Bursts
S. B. Cenko, D. A. Frail, F. A. Harrison +22
Long-duration gamma-ray bursts (GRBs) are widely believed to be highly-collimated explosions (opening angle theta ~ 1-10 deg). As a result of this beaming factor, the true energy r…
A detailed study of the optical attenuation of gamma-ray bursts in the Swift era
O. M. Littlejohns, N. R. Butler, A. Cucchiara +16
We present optical and near-infrared (NIR) photometry of 28 gamma-ray bursts (GRBs) detected by the \textit{Swift} satellite and rapidly observed by the Reionization and Transients…
A Machine Learning Method to Infer Fundamental Stellar Parameters from Photometric Light Curves
A. A. Miller, J. S. Bloom, J. W. Richards +6
A fundamental challenge for wide-field imaging surveys is obtaining follow-up spectroscopic observations: there are > photometrically cataloged sources, yet modern spectrosc…
Unveiling the Origin of GRB 090709A: Lack of Periodicity in a Reddened Cosmological Long-Duration Gamma-Ray Burst
S. B. Cenko, N. R. Butler, E. O. Ofek +15
We present broadband (gamma-ray, X-ray, near-infrared, optical, and radio) observations of the gamma-ray burst (GRB) 090709A and its afterglow in an effort to ascertain the origin…
Understanding the Nature of the Optical Emission in Gamma-Ray Bursts: Analysis from TAROT, COATLI, and RATIR Observations
R. L. Becerra, A. Klotz, J. L. Atteia +12
We collected the optical light curve data of 227 gamma-ray bursts (GRBs) observed with the TAROT, COATLI, and RATIR telescopes. These consist of 133 detections and 94 upper limits.…
Late Central Engine Activity in GRB 180205A
R. L. Becerra, A. M. Watson, N. Fraija +16
We present optical photometry of the afterglow of the long GRB 180205A with the COATLI telescope from 217 seconds to about 5 days after the {\itshape Swift}/BAT trigger. We analyse…
Observations of the Naked-Eye GRB 080319B: Implications of Nature's Brightest Explosion
J. S. Bloom, D. A. Perley, W. Li +18
The first gamma-ray burst (GRB) confirmed to be bright enough to be seen with the naked eye, GRB 080319B at redshift z = 0.937, allowed for exquisite follow-up observations across…