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A comprehensive study of GRB 070125, a most energetic gamma ray burst
Poonam Chandra, S. Bradley Cenko, Dale Frail +21
We present a comprehensive multiwavelength analysis of the bright, long duration gamma-ray burst GRB 070125, comprised of observations in -ray, X-ray, optical, millimeter and ce…
GRB070125: The First Long-Duration Gamma-Ray Burst in a Halo Environment
S. B. Cenko, D. B. Fox, B. E. Penprase +15
We present the discovery and high signal-to-noise spectroscopic observations of the optical afterglow of the long-duration gamma-ray burst GRB070125. Unlike all previously observed…
GRB070610 : A Curious Galactic Transient
M. M. Kasliwal, S. B. Cenko, S. R. Kulkarni +23
GRB 070610 is a typical high-energy event with a duration of 5s.Yet within the burst localization we detect a highly unusual X-ray and optical transient, SwiftJ195509.6+261406. We…
GRB 060505: A possible short-duration gamma-ray burst in a star forming region at redshift of 0.09
E. O. Ofek, S. B. Cenko, A. Gal-Yam +26
On 2006 May 5, a four second duration, low energy, ~10^49 erg, Gamma-Ray Burst (GRB) was observed, spatially associated with a z=0.0894 galaxy. Here, we report the discovery of the…
A New Population of High Redshift Short-Duration Gamma-Ray Bursts
E. Berger, D. B. Fox, P. A. Price +23
The redshift distribution of the short-duration GRBs is a crucial, but currently fragmentary, clue to the nature of their progenitors. Here we present optical observations of nine…
The gamma-ray burst GRB060614 requires a novel explosive process
A. Gal-Yam, D. Fox, P. Price +26
Over the past decade our physical understanding of gamma-ray bursts (GRBs) has progressed rapidly thanks to the discovery and observation of their long-lived afterglow emission. Lo…
Multi-Wavelength Observations of GRB 050820A: An Exceptionally Energetic Event Followed from Start to Finish
S. B. Cenko, M. Kasliwal, F. A. Harrison +25
We present observations of the unusually bright and long gamma-ray burst GRB 050820A, one of the best-sampled broadband data sets in the Swift era. The gamma-ray light curve is mar…
A Spectacular Radio Flare from XRF 050416a at 40 days and Implications for the Nature of X-ray Flashes
A. M. Soderberg, E. Nakar, S. B. Cenko +26
We present detailed optical, near-infrared, and radio observations of the X-ray flash 050416a obtained with Palomar and Siding Springs Observatories as well as HST and the VLA, pla…
An Energetic Afterglow From A Distant Stellar Explosion
D. A. Frail, P. B. Cameron, M. Kasliwal +10
We present the discovery of radio afterglow emission from the high redshift (z=6.295) burst GRB 050904. The peak flux density for this burst is similar to typical low-redshift gamm…
Relativistic ejecta from XRF 060218 and the rate of cosmic explosions
A. M. Soderberg, S. R. Kulkarni, E. Nakar +22
Over the last decade, long-duration gamma-ray bursts (GRBs) including the subclass of X-ray flashes (XRFs) have been revealed to be a rare variety of Type Ibc supernova (SN). While…
The Afterglow, Energetics and Host Galaxy of the Short-Hard Gamma-Ray Burst 051221a
A. M. Soderberg, E. Berger, M. Kasliwal +9
We present detailed optical, X-ray and radio observations of the bright afterglow of the short gamma-ray burst 051221a obtained with Gemini, Swift/XRT, and the Very Large Array, as…
The Afterglows, Redshifts, and Properties of Swift Gamma-Ray Bursts
E. Berger, S. R. Kulkarni, D. B. Fox +29
We present optical, near-IR, and radio follow up of sixteen Swift bursts, including our discovery of nine afterglows and a redshift determination for three. These observations, sup…
The Radio Afterglow and Host Galaxy of the Dark GRB 020819
P. Jakobsson, D. A. Frail, D. B. Fox +8
Of the fourteen gamma-ray bursts (GRBs) localized to better than 2' radius with the SXC on HETE-2, only two lack optical afterglow detections, and the high recovery rate among this…
An HST Study of the Supernovae Accompanying GRB 040924 and GRB 041006
A. M. Soderberg, S. R. Kulkarni, P. A. Price +23
We present the results from a {\it Hubble Space Telescope/ACS} study of the supernovae associated with gamma-ray bursts 040924 () and 041006 (). We find evidence th…
The Discovery of the Optical and Near-IR Afterglows of the First Swift Gamma-Ray Bursts
E. Berger, D. B. Fox, S. R. Kulkarni +16
We present optical and near-infrared searches for afterglow emission from the first four Swift bursts with accurate positions from the X-ray Telescope (XRT). Using telescopes at La…
A Redshift Determination for XRF 020903: First Spectroscopic Observations of an X-Ray Flash
A. M. Soderberg, S. R. Kulkarni, E. Berger +10
We report the discovery of optical and radio afterglow emission from the extremely soft X-ray flash, XRF 020903. Our spectroscopic observations provide the first redshift for an X-…
The Early Optical Afterglow of GRB 030418 and Progenitor Mass Loss
E. S. Rykoff, D. A. Smith, P. A. Price +13
The ROTSE-IIIa telescope and the SSO-40 inch telescope, both located at Siding Spring Observatory, imaged the early time afterglow of GRB 030418. In this report we present observat…
A Common Origin for Cosmic Explosions Inferred from Fireball Calorimetry
E. Berger, S. R. Kulkarni, G. Pooley +8
Past studies suggest that long-duration gamma-ray bursts (GRBs) have a standard energy of E_gamma ~ 10^51 erg in ultra-relativistic ejecta when corrected for asymmetry ("jets"). Ho…
Discovery of Early Optical Emission from GRB 021211
D. W. Fox, P. A. Price, A. M. Soderberg +11
We report our discovery and early time optical, near-infrared, and radio wavelength follow-up observations of the afterglow of the gamma-ray burst GRB 021211. Our optical observati…
The Broadband Afterglow of GRB980703
D. A. Frail, S. A. Yost, E. Berger +8
We present radio observations of the afterglow of the bright gamma-ray burst GRB980703 made between one day and one year after the burst. These data are combined with published lat…
The Cosmic Gamma-Ray Bursts and Their Host Galaxies in a Cosmological Context
S. G. Djorgovski, S. R. Kulkarni, D. A. Frail +14
Studies of the cosmic gamma-ray bursts (GRBs) and their host galaxies are now starting to provide interesting or even unique new insights in observational cosmology. Observed GRB h…
Hubble Space Telescope and Ground-Based Optical and Ultraviolet Observations of GRB010222
T. J. Galama, D. Reichart, T. M. Brown +12
We report on Hubble Space Telescope WFPC2 optical and STIS near ultraviolet MAMA observations, and ground-based optical observations of GRB010222, spanning 15 hrs to 71 days. The o…
Optical Spectropolarimetry of the GRB 020813 Afterglow
A. J. Barth, R. Sari, M. H. Cohen +6
The optical afterglow of gamma-ray burst 020813 was observed for 3 hours with the LRIS spectropolarimeter at the Keck-I telescope, beginning 4.7 hours after the burst was detected…
Discovery of GRB 020405 and its Late Red Bump
P. A. Price, S. R. Kulkarni, E. Berger +41
We present the discovery of GRB 020405 made with the Inter-Planetary Network (IPN). With a duration of 60 s, the burst appears to be a typical long duration event. We observed the…