TITLE:   GCN CIRCULAR
NUMBER:  33615
SUBJECT: GRB 230414A: Mondy optical afterglow candidate
DATE:    23/04/14 17:17:45 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

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

We observed  the field of Swift GRB 230414A (D'Ai et al. GCN 33612) with 
AZT-33IK telescope of Mondy observatory  in  R-filter on
2023-04-14 starting (UT) 16:41:07. Within prompt enhanced Swift-XRT 
position (Evans et al., GCN 33613) we detect fading  object at the 
position of (J2000) 12 04 22.60 +53 09 16.5  with an error of 0.2 arcsec 
in both coordinates. Since the object is absent in DSS2 and variable we 
suggest the object as an afterglow of GRB 230414A.

Preliminary photometry  of first images is following

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

2023-04-14 16:41:07  0.01859  1x120 R        19.2   0.2   20.0

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