GCN Circular 9741
Subject
GRB 090726: optical observation
Date
2009-07-31T20:36:03Z (15 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Volnova (SAI MSU), E. Pavlenko, A. Sklyanov, O. Antoniuk (CrAO), A.
Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 090726 (Page et al., GCN 9706) in
R-filter on Jul. 27 between (UT) 18:19:22 - 20:28:58 with Shajn telescope
of CrAO. We detect afterglow (Moskvitin et al., GCN 9709) in a stacked
image. The photometry against nearby USNO-B1.0 stars is following:
T0+ Filter, Exposure, mag., err.
(d) (s)
0.8626 R 114x60 23.60 +/- 0.25
While the index of power law approximation of the light curve during early
observation (Moskvitin et al., GCN 9709) is ~ -1.0, the power law index
between observation presented by Moskvitin et al. (GCN 9709) and our
observation is -1.6, clearly suggesting a break between 0.079 and 0.863
days.