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VLT spectroscopy of GRB 990510 and GRB 990712; probing the faint and bright end of the GRB host galaxy population
P. M. Vreeswijk, A. Fruchter, L. Kaper +15
We present time-resolved optical spectroscopy of the afterglows of the gamma-ray bursts GRB 990510 and GRB 990712. Through the identification of several absorption lines in the fir…
GRB990712: First Indication of Polarization Variability in a Gamma-ray Burst Afterglow
E. Rol, R. A. M. J. Wijers, P. M. Vreeswijk +9
We report the detection of significant polarization in the optical afterglow of GRB990712 on three instances 0.44, 0.70 and 1.45 days after the gamma-ray burst, with (P, theta) bei…
Discovery of the optical counterpart and early optical observations of GRB990712
Kailash C. Sahu
We present the discovery observations of the optical counterpart of the gamma-ray burster GRB990712 taken 4.16 hours after the outburst and discuss its light curve observed in the…
Prompt and afterglow emission from the X-ray rich GRB981226 observed with BeppoSAX
F. Frontera, L. A. Antonelli, L. Amati +20
We discuss observations of the prompt X and gamma-ray emission and X-ray afterglow from GRB981226. This event has the weakest gamma-ray peak flux detected with the Gamma-Ray Burst…
Prompt and delayed emission properties of Gamma-Ray Bursts observed with BeppoSAX
F. Frontera, L. Amati, E. Costa +14
We investigated the spectral evolution in the 2--700 keV energy band of Gamma-Ray Bursts (GRBs) detected by the Gamma-Ray Burst Monitor (GRBM) and localized with the Wide Field Cam…
The X-ray, Optical and Infrared Counterpart to GRB 980703
P. M. Vreeswijk, T. J. Galama, A. Owens +36
We report on X-ray, optical and infrared follow-up observations of GRB 980703. We detect a previously unknown X-ray source in the GRB error box; assuming a power law decline we fin…
Discovery of the peculiar supernova 1998bw in the error box of GRB980425
T. J. Galama, P. M. Vreeswijk, J. van Paradijs +42
The discovery of X-ray, optical and radio afterglows of gamma-ray bursts (GRBs) and the measurements of the distances to some of them have established that these events come from G…
Spectral Properties of the Prompt X-ray emission and Afterglow from the Gamma-Ray Burst of 28 February 1997
F. Frontera, E. Costa, L. Piro +18
We report high-energy spectral data of the prompt emission of GRB970228 and its X-ray afterglow. We establish that the nature of the X-ray afterglow emission is non-thermal and sim…
Radio Monitoring of the January 11, 1997 Gamma-Ray Burst
D. A. Frail, S. R. Kulkarni, E. Costa +8
We report on a comprehensive radio monitoring program of the bright gamma-ray burster GRB970111. These VLA observations were made at a frequency of 1.4 GHz and span a range of post…