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GCN Circular 11494

GRB 101225A (Swift trigger 441015): optical upper limit
2010-12-25T21:51:06Z (13 years ago)
Alexei Pozanenko at IKI, Moscow <>
M. Andreev, A. Sergeev (Terskol Branch of Institute of Astronomy), 
A.Pozanenko (IKI) on behalf of larger GRB follow up collaboration report:

We observed the field of the Swift  trigger 441015 = GRB 101225A? (Racusin 
et al, GCN 11493) with Zeiss-600 telescope of Mt.Terskol observatory.
In the XRT error circle (Racusin et al, GCN 11493) we do not detect any 
sources down to R=21.5 (3 sigma):

UT (mid time), Exposure,  Filter, ULimit
19:46              21 x 120s  R        21.5

The combined image can be found at
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