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GCN Circular 17459

GRB 150212A: Khureltogot optical upper limit
2015-02-12T20:37:01Z (9 years ago)
Alexei Pozanenko at IKI, Moscow <>
E. Mazaeva (IKI), S. Schmalz (AIP), N. Tungalag (Research Center of 
Astronomy and Geophysics MAS), A. Volnova (IKI), I.Molotov (KIAM), A. 
Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:

We observed the field of 150212A (Page et al., GCN 17449) with ORI-40 
telescope of Khureltogot observatory on Feb., 12 starting on (UT) 
11:32:28. We obtained 24 unfiltered images of 15 s exposure. We did not 
detect any optical counterpart in XRT error circle (Evans et al. GCN 
17452). Details of the photometry are following:

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

2015-02-12  11:32:28  0.02739 none  24*15  15.8

The star mentioned by Cenko et al. (GCNs 17451, 17454) is visible in our 
combined image and have a brightness of 15.85 +/- 0.25.

The photometry is based on R magnitudes of nearby USNO-B1.0 stars

USNO-B1_id    R2
1374-0373548  15.39
1374-0373502  14.41
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