Hubble Space Telescope and Ground-Based Optical and Ultraviolet Observations of GRB010222

Astrophysics, abstract
astro-ph/0301059

From: Dale A. Frail <dfrail@aoc.nrao.edu>

Date: Sun, 5 Jan 2003 18:49:52 GMT   (158kb)

Authors:
T. J. Galama,
D. Reichart,
T. M. Brown,
R. A. Kimble,
P. A. Price,
E. Berger,
D. A. Frail,
S. R. Kulkarni,
S. A. Yost,
A. Gal-Yam,
J. S. Bloom,
F. A. Harrison,
R. Sari,
D. Fox,
S. G. Djorgovski

Comments: ApJ, in press

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 observations are well-described by a relativistic
blast-wave model with a hard electron-energy distribution, p = 1.57, and a jet
transition at t_j=0.93 days. 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 Hubble Space Telescope observations. The host galaxy is found
to contain a very compact core (size <0.25 arcsec) 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 GRB010222. We find that the far ultraviolet curvature component (c_4) is
rather large. In combination with the low optical extinction A_V =0.11 mag,
when compared to the Hydrogen column inferred from X-ray observations, we
suggest that this is evidence for dust destruction.

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