GCN Circular 4087
Subject
GRB051008: optical candidate
Event
Date
2005-10-11T19:26:24Z (21 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
V.Rumyantsev (CrAO), V.Biryukov (SAI, MSU), A.Pozanenko (IKI), M. Ibrahimov
(MAO) on behalf of larger GRB follow up collaboration report:
We reanalyzed the R-band observations of GRB051008 with 2.6m Shajn
telescope of CrAO (Rumyantsev et al., GCN4081). Within XRT error circle
(Perri et al., GCN4073) we found two objects. One object #1 was reported
early in GCN 4081:
RA(J2000) =13 31 29.98
Dec =+42 05 52.06
It is clearly visible in both epochs of observation. Object #2 is apart
6.5" S-W from the object #1, and is not visible in second epoch. The
photometry against of USNO A2.0 (R) is following:
Mid time Exposure object#1 object#2
Oct.8 (UT)
17:14 15x60 s 21.50+/-0.13 22.19+/-0.27
17:37 22x60 s 21.32+/-0.13 >22.6 (3 sigma UL)
We suggest object #2 as an afterglow candidate.
The temporal index estimated from our observations is alpha < -0.5.
Image of the first epoch can be found at
http://grb.rssi.ru/GRB051008/GRB051008_ZTSh_R1.gif
[Correction to GCN 4081: The start of observation on Oct. 8 is 17:05:08
(UT), i.e 32 minutes after the burst onset.]
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