TITLE:   GCN CIRCULAR
NUMBER:  11589
SUBJECT: GRB 110112A: optical upper limit
DATE:    11/01/20 21:37:07 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

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

We observed  the field of the Swift GRB 110112A (Stamatikos  et al., GCN 
11553)  with AZT-11 telescope of CrAO starting on Jan. 12 (UT) 16:35. In the 
enhanced Swift-XRT position  (Evanset al., GCN 11556) we do not detect 
optical afterglow (Xin et al., GCN 11554) up to R=20.6. The photometry is 
based on the
USNO B1.0 star 1164-0563915 (21 59 45.42 +26 27 18.3) assuming R=15.64.

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

0.52955  R 13x180  R   >20.6