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GCN Circular 17443

GRB 150211A: Mondy optical upper limit
2015-02-11T19:32:58Z (9 years ago)
Alexei Pozanenko at IKI, Moscow <>
E. Mazaeva (IKI), A. Volnova (IKI), E. Klunko (ISTP), I. Korobtsev 
(ISTP), M. Eselevich (ISTP), A. Pozanenko (IKI) report on behalf of 
larger GRB follow-up collaboration:

We observed the field of GRB 150211A (Starling, et al., GCN 17434) with 
AZT-33IK telescope of Sayan observatory (Mondy). We obtained several 
images in R-filter on Feb., 11,  starting (UT) 12:02:35. Within XRT 
error cirvle (Campana, et al.,GCN 17435)  we do not detect any optical 
source. Upper limit is following

Date       UT start   t-T0     Filter   Exp.  UL(3sigma)
                       (mid, days)       (s)

2015-02-11 12:02:35   0.03091  R       1800   21.9

The photometry   is based on nearby USNO-B1.0 stars:
USNO-B1.0_id     R2
1453-0255559    18.45
1453-0255560    18.27
1453-0255536    18.49
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