[vsnet-grb-info 16208] GRB 150222A: Mondy optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17489
SUBJECT: GRB 150222A: Mondy optical observations
DATE:    15/02/22 22:42:58 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

E. Mazaeva (IKI), 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 150222A  (Bernardini  et al., GCN 17486) 
with AZT-33IK telescope of Sayan observatory (Mondy)  starting on Feb., 
22 (UT) 17:48:56. We obtained 37 images in R-filter of 120 s exposure. 
Within the Swift-XRT error circle (Bernardini  et al., GCN 17486) we 
marginally detected optical  source with a magnitude of R=22.15+/-0.25 
at 0.06201 days after trigger (mid time). Photometry of the source is 
based on nearby USNO-B1.0 (R2) stars. At this time we cannot confirm 
variability or fading nature of the source.