TITLE:   GCN CIRCULAR
NUMBER:  11973
SUBJECT: GRB 110422A: optical observations in CrAO
DATE:    11/04/24 22:48:24 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

V. Rumyantsev,  K. Antoniuk (CrAO), A. Pozanenko (IKI) report on behalf of 
larger GRB  follow-up collaboration:

We observed  the field of the Swift GRB 110422A (Mangano  et al., GCN 
11957) with AZT-11 telescope of CrAO between  Apr. 22 (UT) 19:13 and  20:11. 
We clearly detect the afterglow (Klunko et al. GCN 11958, Gres et al. GCN 
11960, Xu et al. GCN 11961). The photometry is based on the USNO B1.0 star 
1651-0050626   (07 28 13.15 +75 06 51.5) assuming R=18.56 :

T0+      Filter,   Exposure, mag.
(mid, d)              (s)

0.1675  R        20x180       19.32  +/-0.08