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GCN Circular 11266

GRB 100901A: optical observation in Maidanak, break confirmation
2010-09-10T01:48:03Z (14 years ago)
Alexei Pozanenko at IKI, Moscow <>
A. Volnova (SAI MSU),  A. Pozanenko (IKI),  M. Ibrahimov (MAO), B. Hafizov 
(MAO), B. Satovski (Astrotel)  report on behalf of  larger GRB  follow-up 

We observed  the field of the Swift GRB 100901A (Immler  et al., GCN 11159) 
with AZT-22 telescope of Maidanak observatory starting  Sep. 7 (UT) 
20:32:06. We clearly detect the afterglow (Immler  et al., GCN 11159 and 
other follow-up ground based observations) in R-filter. The photometry of a 
stacked image is based on the same reference SDSS-DR7 stars used by our 
collaboration previously (GCNs 11191, 11200, 11255):

T0+      Filter,   Exposure, mag.
(mid, d)              (s)

6.2977  R        4*300    22.05+/-0.09

The photometry above confirms suggested break (Kann et al, GCN 11246) in a 
light curve of the afterglow.
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