[vsnet-grb-info 14399] GRB 140108A: Mondy optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15713
SUBJECT: GRB 140108A: Mondy optical upper limit
DATE:    14/01/10 12:39:53 GMT
FROM:    Alina Volnova at SAI MSU  <alinusss at gmail.com>

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

We observed the field of the Swift GRB 140108A (Racusin et al., GCN
15699) with AZT-33IK telescope of Sayan observatory (Mondy) starting
Jan., 09 (UT) 15:10:20. We obtained several images in R-filter with
exposure of 180 seconds. On the stacked image we do not detected
the optical afterglow (Gorbovskoy et al., GCN 15701; Gorosabel et al.,
15702).

The details of the photometry are the following:

UT start,      t-T0           Filter     Exp.     OT    UL
                (mid, days)               (s)                (3 sigma)
15:10:20    0.94627       R         34*180   n/d    22.0

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

USNO-B id        RA                Dec             R2
1487-0322168   21:40:30.85   +58:43:53.1   18.18
1487-0322049   21:40:20.16   +58:43:58.3   17.96
1487-0322069   21:40:21.62   +58:45:00.6   17.29