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Polarization Evolution of the GRB 020405 Afterglow
S. Covino, D. Malesani, G. Ghisellini +16
Polarization measurements for the optical counterpart to GRB 020405 are presented and discussed. Our observations were performed with the VLT-UT3 (Melipal) during the second and th…
The Faint Optical Afterglow and Host Galaxy of GRB 020124: Implications for the Nature of Dark Gamma-Ray Bursts
E. Berger, S. R. Kulkarni, J. S. Bloom +24
We present ground-based optical observations of GRB 020124 starting 1.6 hours after the burst, as well as subsequent Very Large Array (VLA) and Hubble Space Telescope (HST) observa…
GRB 010921: Strong Limits on an Underlying Supernova from HST
P. A. Price, S. R. Kulkarni, B. P. Schmidt +24
GRB 010921 was the first HETE-2 GRB to be localized via its afterglow emission. The low-redshift of the host galaxy, z=0.451, prompted us to undertake intensive multi-color observa…
Spectral analysis of 35 GRBs/XRFs observed with HETE-2/FREGATE
C. Barraud, J-F. Olive, J. P. Lestrade +27
We present a spectral analysis of 35 GRBs detected with the HETE-2 gamma-ray detectors (the FREGATE instrument) in the energy range 7-400 keV. The GRB sample analyzed is made of GR…
FREGATE observation of a strong burst from SGR1900+14
J-F. Olive, K. Hurley, J-P. Dezalay +7
After a long period of quiescence, the soft gamma repeater SGR1900+14 was suddenly reactivated on April 2001. On July 2, 2001, a bright flare emitted by this source triggerred the…
In-flight verification of the FREGATE spectral response
J-F. Olive, J-P. Dezalay, J-L. Atteia +6
We present the first results of the in-flight validation of the spectral response of the FREGATE X/gamma detectors on-board the HETE-2 satellite. This validation uses the Crab puls…