TITLE:   GCN CIRCULAR
NUMBER:  35945
SUBJECT: X-ray transient EP240315a: Kitab observatory optical upper limitns
DATE:    24/03/17 16:17:06 GMT
FROM:    Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>

N. Pankov (HSE, IKI), A. Schmalz (KIAM), A. Pozanenko (IKI), S. Belkin (IKI), A. Volnova (IKI), A. Novichonok (Petrozavodsk State University, KIAM) report on behalf of IKI GRB FuN:

We observed the field of the optical counterpart of the X-ray transient EP240315a (Einstein Probe, GCN 35931, Zhang et al.; GCN 35932, GCN 35933, Srivastav et al.; GCN 35935, Jiang et al.; GCN 35937, Rau; GCN 35938, Chen et al.; GCN 35944, Leonini et al.) with   Kitab-ISON RC-36  telescope starting on 2024-03-16 (UT) 18:00:00 in Clear filter.  We do not detect the optical afterglow (Srivastav et al., GCN 35932) at redshift of z = 4.859 (Saccardi et al., GCN  35936).  Preliminary photometry of the filed is following

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

2024-03-16 18:00:00  0.91685   Clear  22*60  n/d    n/d   19.2

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