TITLE:   GCN CIRCULAR
NUMBER:  34994
SUBJECT: GRB 231111A: Mondy optical observations
DATE:    23/11/12 03:05:47 GMT
FROM:    Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>

N. Pankov (HSE, IKI),  E. Klunko (ISTP),  A. Pozanenko (IKI), S. Belkin (IKI,HSE) report on behalf of GRB IKI FuN:

We observed  the field of Swift GRB 231111A (Melandri et al. GCN 34981) with AZT-33IK telescope of Mondy observatory  in  R-filter on
2023-11-11 starting (UT) 14:36:53. We detect afterglow   (Melandri et al. GCN 34981; Jiang et al. GCN 34982; Lipunov et al. GCN 34983) within  Enhanced Swift-XRT error circle. 
Preliminary photometry  of first images is following

Date       UT start  t-T0     Exp.   Filter   OT     Err.  UL(3sigma)
                   (mid, days)  (s)
2023-11-11  14:36:53  0.014284  1x120 R       18.24 0.08 20.3

The photometry is based on nearby USNO-B1.0 R2 stars.