2003ApJ...587..135G -
Astrophys. J., 587, 135-142 (2003/April-2)
Hubble Space Telescope and ground-based optical and ultraviolet observations of GRB 010222.
GALAMA T.J., REICHART D., BROWN T.M., KIMBLE R.A., PRICE P.A., BERGER E., FRAIL D.A., KULKARNI S.R., YOST S.A., GAL-YAM A., BLOOM J.S., HARRISON F.A., SARI R., FOX D. and DJORGOVSKI S.G.
Abstract (from CDS):
We report on Hubble Space Telescope (HST) Wide Field Planetary Camera 2 optical and Space Telescope Imaging Spectrograph (STIS) near-ultraviolet MAMA observations and ground-based optical observations of GRB 010222, spanning 15 hr to 71 days. The observations are well described by a relativistic blast wave model with a hard electron energy distribution, p=1.57+0.04–0.03, and a jet transition at t*=0.93+0.15–0.06days. These values are slightly larger than previously found as a result of a correction for the contribution from the host galaxy to the late-time ground-based observations and the larger temporal baseline provided by the HST observations. The host galaxy is found to contain a very compact core (size <0".25), which coincides with the position of the optical transient. The STIS near-ultraviolet MAMA observations allow for an investigation of the extinction properties along the line of sight to GRB 010222. We find that the far-ultraviolet curvature component c4 is rather large. In combination with the low optical extinction, AV=0.110+0.010–0.021mag, when compared with the hydrogen column inferred from X-ray observations, we suggest that this is evidence for dust destruction.
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Journal keyword(s):
Gamma Rays: Bursts
Simbad objects:
5
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