[vsnet-grb-info 14681] GRB 140311B: Mondy optical limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15995
SUBJECT: GRB 140311B: Mondy optical limit
DATE:    14/03/18 20:45:27 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

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 140311B (Racusin et al., GCN 15945)  with 
AZT-33IK telescope of Mondy observatory starting on Mar. 12 (UT) 
20:21:16. Within enhanced Swift-XRT eror circle (Evans et al., GCN 
15958) we do not detect the optical afterglow (Xu  et al., GCN 15949). 
Details of the photometry is following:

date       UT start   t-T0      Exp.    Filter  UpperLimit (3sigma)
                     (mid, days) (s)
2014-03-12 20:21:16  0.98389    30x120  R       20.2

The photometry is based on reference star SDSS-DR9, (R mag,
transformation by Lupton 2005):

N  SDSS_id          R(Lupton)   err
J164910.91+524333.6 17.449    0.009