[vsnet-grb-info 5258] GRB 071020: ROTSE-III Analysis of Optical
Counterpart
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Sat Oct 20 17:07:37 JST 2007
TITLE: GCN CIRCULAR
NUMBER: 6951
SUBJECT: GRB 071020: ROTSE-III Analysis of Optical Counterpart
DATE: 07/10/20 08:07:20 GMT
FROM: Fang Yuan at ROTSE <yuanfang at umich.edu>
F. Yuan (U Mich), E.S. Rykoff (UCSB), T.A. McKay (U Mich), B. E.
Schaefer (Louisiana State), R. Quimby (Caltech), H. Swan (U Mich),
report on behalf of the ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB
071020 (Swift trigger 294835; Holland, et al., GCN6949) and detected the
optical counterpart (Schaefer, et al., GCN 6948). During our first 80
seconds observation (starting 25.6 sec after the burst), the OT faded
with a decay index of 1.52 +/- 0.03.
We notice that the burst location is 9.7h^-1 kpc from the central bulge
of SDSS J075843.38+325141.7, a galaxy with an old stellar population
located at z=0.0166. DR6 SDSS data suggest this galaxy as M_r ~ -19.4,
and a central velocity dispersion of 135 km/s.
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