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The galaxies in the field of the nearby GRB980425/SN1998bw
S. Foley, D. Watson, J. Gorosabel +5
We present spectroscopic observations of ESO 184-G82, the host galaxy of GRB980425/SN1998bw, and six galaxies in its field. A host redshift of z=0.0087+/-0.0006 is derived, consist…
A mean redshift of 2.8 for Swift gamma-ray bursts
P. Jakobsson, A. Levan, J. P. U. Fynbo +18
The exceptionally high luminosities of gamma-ray bursts (GRBs), gradually emerging as extremely useful probes of star formation, make them promising tools for exploration of the hi…
Multi-wavelength analysis of the field of the dark burst GRB 031220
A. Melandri, B. Gendre, L. A. Antonelli +8
We have collected and analyzed data taken in different spectral bands (from X-ray to optical and infrared) of the field of GRB031220 and we present results of such multiband observ…
Low-resolution VLT spectroscopy of GRBs 991216, 011211 and 021211
P. M. Vreeswijk, A. Smette, A. S. Fruchter +16
We present low-resolution VLT spectroscopy of the afterglow of the gamma-ray bursts (GRBs) 991216, 011211 and 021211. Our spectrum of GRB991216 is the only optical spectrum for thi…
GRB 050904 at redshift 6.3: observations of the oldest cosmic explosion after the Big Bang
G. Tagliaferri, L. A. Antonelli, G. Chincarini +10
We present optical and near-infrared observations of the afterglow of the gamma-ray burst GRB 050904. We derive a photometric redshift z = 6.3, estimated from the presence of the L…
The host galaxy cluster of the short gamma-ray burst GRB 050509B
K. Pedersen, A. Eliasdottir, J. Hjorth +7
The first arcsecond localization of a short gamma-ray burst, GRB 050509B, has enabled detailed studies of a short burst environment. We here report on studies of the environment of…
The optical afterglow of the short gamma-ray burst GRB 050709
Jens Hjorth, Darach Watson, Johan P. U. Fynbo +9
It has long been known that there are two classes of gamma-ray bursts (GRBs), mainly distinguished by their durations. The breakthrough in our understanding of long-duration GRBs (…
A log N(HI) = 22.6 DLA in a dark gamma-ray burst: the environment of GRB 050401
D. Watson, J. P. U. Fynbo, C. Ledoux +33
The optical afterglow spectrum of GRB050401 (at z=2.8992+/-0.0004) shows the presence of a DLA, with log(nHI)=22.6+/-0.3. This is the highest column density ever observed in a DLA,…
The short-duration GRB 050724 host galaxy in the context of the long-duration GRB hosts
J. Gorosabel, A. J. Castro-Tirado, S. Guziy +11
We report optical and near-infrared broad band observations of the short-duration GRB 050724 host galaxy, used to construct its spectral energy distribution (SED). Unlike the hosts…
Discovery and identification of the very high redshift afterglow of GRB 050904
J. Haislip, M. Nysewander, D. Reichart +39
In 2000, Lamb and Reichart predicted that gamma-ray bursts (GRBs) and their afterglows occur in sufficient numbers and at sufficient brightnesses at very high redshifts (z > 5) to…
Multi-Wavelength Studies of the Optically Dark Gamma-Ray Burst 001025A
K. Pedersen, K. Hurley, J. Hjorth +18
We identify the fading X-ray afterglow of GRB 001025A from XMM-Newton observations obtained 1.9-2.3 days, 2 years, and 2.5 years after the burst. The non-detection of an optical co…
Spectro-photometric study of the GRB 030329 host galaxy
J. Gorosabel, D. Perez-Ramirez, J. Sollerman +13
In this study optical/near-infrared(NIR) broad band photometry and optical spectroscopic observations of the GRB 030329 host galaxy are presented. The Spectral Energy Distribution…
Gamma-Ray Burst Selected High Redshift Galaxies: Comparison to Field Galaxy Populations to z~3
C. J. Conselice, P. M. Vreeswijk, A. S. Fruchter +6
We study the internal structural properties of 37 long duration gamma-ray burst (GRB) host galaxies imaged with the Hubble Space Telescope. Fitting exponential disk and r^1/4 model…
GRB 050509B: Constraints on short gamma-ray burst models
J. Hjorth, J. Sollerman, J. Gorosabel +19
We have obtained deep optical images with the Very Large Telescope at ESO of the first well-localized short-duration gamma-ray burst, GRB 050509B. From V and R imaging, initiated ~…
The GRB 030329 host: a blue low metallicity subluminous galaxy with intense star formation
J. Gorosabel, D. Pérez-Ramírez, J. Sollerman +13
We present broad band photometry and spectroscopic observations of the host galaxy of GRB 030329. Analysis of the spectral emission lines shows that the host is likely a low metall…
GRB 050509b: the elusive optical/nIR/mm afterglow of a short-duration GRB
A. J. Castro-Tirado, A. de Ugarte Postigo, J. Gorosabel +17
We present multiwavelength (optical/near infrared/millimetre) observations of a short duration gamma-ray burst detected by Swift (GRB 050509b) collected between 0 seconds and ~18.8…
The search for the host galaxy of the gamma-ray burst GRB 000214
S. Guziy, J. Gorosabel, A. J. Castro-Tirado +7
We present UBVRI-band observations taken ~300 days after the BeppoSAX gamma-ray burst GRB 000214. This GRB did not show a detectable optical afterglow, however due to the localizat…
GRB 021004 modelled by multiple energy injections
A. de Ugarte Postigo, A. J. Castro-Tirado, J. Gorosabel +43
GRB 021004 is one of the best sampled gamma-ray bursts (GRB) to date, although the nature of its light curve is still being debated. Here we present a large amount (107) of new opt…
Radio, millimeter and optical monitoring of GRB030329 afterglow: Constraining the double jet model
L. Resmi, C. H. Ishwara-Chandra, A. J. Castro-Tirado +15
We present radio, millimeter and optical observations of the afterglow of GRB030329. UBVR_{C}I_{C} photometry is presented for a period of 3 hours to 34 days after the burst. Radio…
On the Afterglow and Host Galaxy of GRB021004: A Comprehensive Study with the Hubble Space Telescope
J. P. U. Fynbo, J. Gorosabel, A. Smette +24
(Abridged) We report on HST observations of the late-time afterglow and host galaxy of GRB021004 (z=2.33). Although this GRB is one of the best observed so far, there is substantia…
Ly-alpha and UV emission from high-redshift GRB hosts: To what extent do GRBs trace star formation?
P. Jakobsson, G. Bjornsson, J. P. U. Fynbo +9
We report the result of a search for Ly-alpha emission from the host galaxies of the gamma-ray bursts (GRBs) 030226 (z = 1.986), 021004 (z = 2.335) and 020124 (z = 3.198). We find…
The earliest spectroscopy of the GRB 030329 afterglow with 6-m telescope
V. G. Kurt, V. V. Sokolov, T. A. Fatkhullin +7
The earliest BTA (SAO RAS 6-m telescope) spectroscopic observations of the GRB 030329 optical transient (OT) are presented, which almost coincide in time with the "first break" ($t…
The red optical afterglow of GRB 030725
G. Pugliese, P. Møller, J. Gorosabel +6
We present a photometric study of the optical counterpart of the long-duration Gamma Ray Burst (GRB) 030725, which triggered the HETE FREGATE and WXM instruments on July 25th, 2003…
Late-epoch optical and near-infrared observations of the GRB000911 afterglow and its host galaxy
N. Masetti, E. Palazzi, E. Pian +28
We present the results of an optical and near-infrared (NIR) monitoring campaign of the counterpart of Gamma-Ray Burst (GRB) 000911, located at redshift z=1.06, from 5 days to more…