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GCN Circular 15519

Subject

GRB 131127A: Mondy optical upper limit

Date

2013-11-27T13:18:01Z (10 years ago)

From

Alina Volnova at SAI MSU <alinusss@gmail.com>

E. Klunko (ISTP), A.Volnova (IKI),  M. Eselevich (ISTP), A. Pozanenko(IKI)
report on behalf of larger GRB follow-up collaboration:

We observed the field of the Swift GRB 131127A (Markwardt et al., GCN
15516Not found
 
 
)  with AZT-33IK telescope of Sayan observatory (Mondy) starting Nov.,
27 (UT) 10:40:06. We obtained  several images in R-filter with exposure of
30 and 60 seconds. Within the XRT circle  (Markwardt et al., GCN 15516Not found
 
 
)  we
did not detect any optical object.

The details of the photometry are the following:

UT start,      t-T0           Filter    Exp.             OT     UL
                 (mid, days)              (s)                        (3 sigma)
10:40:06     0.02839       R        7*30+21*60    n/d    21.3

The photometry is based on 3 USNO-B1.0 stars:

USNO-B id     RA              Dec             R2
1265-0518495 22:11:06.80 +36:35:45.6 16.06
1265-0518432 22:10:59.37 +36:35:56.7 16.45
1266-0522367 22:10:48.55 +36:36:43.7 15.45