[vsnet-grb-info 10039] GRB 101225A (Swift trigger 441015): optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  11494
SUBJECT: GRB 101225A (Swift trigger 441015): optical upper limit
DATE:    10/12/25 21:51:06 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

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
http://grb.eam.ru/Swift_441015/Trigger_441015_Zeiss600.jpg