GCN Circular 6945
Subject
GRB071010b: optical observations
Date
2007-10-19T19:41:37Z (18 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Klunko, A. Marchenkov, M. Eselevich (ISTP), A. Shulga, A. Volnova (SAI
MSU), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration
report:
We observed the optical afterglow (Oksanen GCN 6873, Kann et al. GCN 6884)
of GRB071010b (Markwardt et al., GCN 6871) in R-band on Oct.12 ((UT)
19:44:42 - 20:45:06) and Oct. 13 ((UT)19:17:13 - 20:14:49) with 1.5m
telescope of Sayan observatory. The optical afterglow is clearly visible in
stacked images of both epochs. Based on two USNO B1.0 stars (Kann et. al
GCN 6918) (RA (J2000) = 10:02:09.93, Dec. (J2000) = +45:41:18.4, R2=16.80;
RA (J2000) = 10:02:23.11, Dec. (J2000) = +45:41:41.1, R2=16.94) we
estimated brightness of the optical afterglow:
T0+ , Exposure, R_mag
(mid time)
1.9995 d 15x240 s 20.5 +/-0.1
2.979 d 20x180 s 20.8 +/-0.2
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