[vsnet-grb-info 14579] GRB 140226A/iPTF14yb: Mondy optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15893
SUBJECT: GRB 140226A/iPTF14yb: Mondy optical observations
DATE:    14/02/28 16:22:51 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

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

We observed the field of transient iPTF14yb (Cenko et al., GCN 15883,
Beardmore et al., GCN 15884, 15891) of possible GRB 140226A (Hurley et 
al., GCN 15888) with AZT-33IK telescope of Mondy observatory on Feb. 27 
between (UT) 18:59:34 - 19:59:36. On a stacked R-filter image of 30 x 
120 s we marginally detected  iPTF14yb source with S/N ~2, and 
photometry of the source R = 23.0 at Feb. 27.81221 (mid).

The photometry is based on SDSS J144600.66+145826.2 star assuming
R(Lupton transformation)= 17.624 +/- 0.018