TITLE:   GCN CIRCULAR
NUMBER:  23544
SUBJECT: GRB 181213A: Mondy optical observations
DATE:    18/12/16 22:42:44 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), E. Mazaeva (IKI), A. 
Volnova (IKI)  report   on behalf of IKI-FuN:

 We observed the field of GRB 181213A (Evans et al., GCN 23525; Osborne   et 
al., GCN 23528) with AZT-33IK telescope of Sayan observatory (Mondy).   We 
marginally detected   the afterglow (Lipunov et al., GCN 23526; Hu et al. 
GCN 23527;  Siegel   et al., GCN 23529; Belkin et al., GCN 23530; Heintz et 
al., GCN 23537) on Dec. 15 (UT start) 11:57:21

  Preliminary photometry of the filed and and the aferglow is following.

  Date       UT start t-T0    Filter Exp. OT    Err. UL
                    (mid, days) (s)

 2018-12-14 12:10:22 0.97344 R      10*120 n/d  n/d   20.9
 2018-12-15 11:57:21 1.97829 R      29*120 23.15 0.45  23.1


 The photometry is based on nearby USNO-B1.0 stars
 USNO-B1.0_id R2
 1684-0061916 15.83
 1684-0061968 16.55