GCN Circular 36157
Subject
EP240416A: Khureltogoot optical upper limit
Date
2024-04-18T12:29:15Z (a month ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
Via
legacy email
N. Pankov (HSE,IKI), L. Elenin (KIAM), A. Pozanenko (IKI), N. Tungalag (IAG), A. Volnova (IKI), S. Belkin (IKI) report on behalf of GRB IKI FuN:
We observed the EP240416A (Cheng et al., GCN 36138) with the ORI-40 telescope of Khureltogoot observatory in Clear filter starting on 2024-04-16 (UT) 17:57:07. We did not detect the optical counterpart (Chen et al., GCN 36139; An et al., GCN 36144). Preliminary photometry of a stacked image is the following
Date UT start t-T0 Exp. Filter OT Err. UL(3sigma)
(mid, days) (s)
2024-04-16 17:57:07 0.65409 54*60 Clear n/d n/d 19.7
The photometry is based on nearby USNO-B1.0 (R2) stars.
The given results is in agreement with the upper limit obtained by (Xiong et al., GCN 36155).