A. Volnova (SAI MASU), A. Pozanenko (IKI), E. Klunko, I. Korobtsev (ISTP) on
behalf of larger GRB follow up collaboration report:
We observed the Swift GRB 100901A (Immler et al., GCN 11159) with
AZT-33IK telescope of Sayan observatory (Mondy) starting Sep. 01 (UT)
13:44:30 and continued observations within 2 nights after burst onset.
Preliminary light curve of Mondy observation in R as well as R, r and
nonfiltered observations inreported on behalf of our follow up
collaboration (Klunko et al, GCN 11162; Andreev et al, GCN 11166; Andreev
et al, GCN 11168; Elenin et al, GCN 11184; Andreev et al, GCN 11191;
Andreev et al, GCN 11200; Andreev et al, GCN 11201; Elenin et al, GCN
11234; Rumyantsev et al, GCN 11255; Volnova et al, GCN 11266) can be found
The photometry calibration was performed against the same SDSS DR7 stars.
There are some distinct features of the light curve. The tail of the flare
reported earlier (Ivanov et al, GCN 11178), the rapid increase brightness
after power law decay until 0.1d since trigger, the deep gap at ~0.13d, and
the bump at ~0.3d corresponding to the bump in XRT light curve (Page et al,
GCN 11171). We also confirm the late break between 5 and 6 days of the
afterglow (Kann et al, GCN 11246; Volnova et al, GCN 11266).
[GCN OPS NOTE(10sep10): Per author's request, the Subject line
was changed from 100906A to 100901A.]