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. View this GCN Circular online at https://gcn.nasa.gov/circulars/35945. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...