[vsnet-grb-info 9733] GRB 100901A: optical observation at Mt.Terskol

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  11201
SUBJECT: GRB 100901A: optical observation at Mt.Terskol
DATE:    10/09/04 01:15:38 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

M. Andreev, A. Sergeev (Terskol Branch of Institute of Astronomy) and 
A.Pozanenko (IKI) on behalf of larger GRB follow up collaboration report:

We are continuing observations of the Swift GRB 100901A (Immler  et al., GCN 
11159) with the Z-600 telescope of Mt.Terskol observatory in R-filter. In 
combined images we still detect  afterglow (Immler et al., GCN 11159). The 
photometry is based  on several  reference stars of SDSS DR7 and Lupton 
transformation griz -> R used in our previous reports (GCNs 11191, 11200):

T0+     Filter, Exposure,   OT
(d)                 (s)

2.4073  R     15x120        20.13  +/-0.12
2.4282  R     15x120        20.28  +/-0.16