[vsnet-grb-info 14987] GRB 140419A: Continued Mondy optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16281
SUBJECT: GRB 140419A: Continued Mondy optical observations
DATE:    14/05/16 15:49:12 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

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

We continued observation of the Swift GRB 140419A (Marshall et al., GCN 
16118) with AZT-33IK telescope of Sayan observatory (Mondy) on Apr.
25-26. We took several images in R-filter with the exposure of 60 
seconds. On a stacked image from Apr. 25 we detect the optical afterglow
(Zheng et al., GCN 16119; Guver et al., GCN 16120; Butler et al., GCN 
16121; Kuin et al., GCN 16123; Hentunen et al., GCN 16126). On the 
stacked frame from Apr. 26 in the Swift/XRT error circle (Osborne et 
al., GCN 16124) we do not detect any source.

Details of a photometry are the following:

date         UT start   t-T0      Filter   Exp.     OT
                         (mid, days)        (s)
2014-04-25   14:48:25   6.47713   R        90*60    22.81+/-0.17
2014-04-26   14:21:55   7.45841   R        90*60   >21.7 (3 sigma)

The photometry is based on nearby SDSS star, R (gri -> R transformations 
by Lupton 2005):

SDSS id               R
J082752.69+461357.4   17.381+/-0.018