TITLE:   GCN CIRCULAR
NUMBER:  33373
SUBJECT: GRB 230216A Mondy Observations
DATE:    23/02/23 23:42:28 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

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

We observed  the field of Swift GRB 220306B (Klingler et al. GCN 33328) 
with AZT-33IK telescope of Mondy observatory  in  R-filter on 
2023-02-16, 2023-02-18, and 2023-02-20. We detect the optical afterglow 
of GRB 230216A (Gendre et al. GCN33329) on 2023-02-16 and do not detect 
on 2023-02-18 and 2023-02-20.
Preliminary photometry after subtraction of template image obtained on 
2023-02-20 we obtained following results

Date       UT start  t-T0     Exp.  Filter   OT     Err.  UL(3sigma)
                    (mid, days)  (s)

2023-02-16 15:18:03  0.041319 60*60 R        18.10  0.06   22.1
2023-02-18 13:39:52  1.973123 60*60 R        n/d    n/d    21.2

The photometry is based on nearby USNO-B1.0 stars.
             USNO-B1.0
             RA Dec R2
             113.9612341 -8.0016198 16.61
             113.9487699 -8.0038889 16.65
             113.9570121 -7.9997820 17.15