GCN Circular 36187
Subject
EP240414A: Terskol Zeiss-2000 optical upper limit
Date
2024-04-19T17:52:39Z (14 days ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
Via
legacy email
S. Belkin (IKI), I. Sokolov (INASAN, KIAM), A. Pozanenko (IKI), N. Pankov (HSE) report on behalf of GRB IKI FuN:
We observed the EP240414A (Lian et al., GCN 36091) with the Zeiss-2000 telescope of Terskol observatory in R-filter on 2024-04-15 starting (UT) 22:55:21. We did not detect the optical counterpart (Aryan et al., GCN 36094; Xu et al., GCN 36105; Jonker et al., GCN 36110; Xiong et al., 36130; Srivastav et al., GCN 36150; Li et al., GCN 36154; Wang et al., GCN 36171;) down to the limiting magnitude of R~22.0. Preliminary photometry of a stacked image is the following
Date UT start t-T0 Exp. Filter OT Err. UL(3sigma)
(mid, days) (s)
2024-04-15 22:55:21 1.56347 35x90 R n/d n/d 22.0
The photometry is based on nearby USNO-B1.0 stars.
USNO-B1.0
RA DEC R2
12:46:00.7214400 -09:43:21.021600 17.15
12:45:53.8893600 -09:43:46.700400 15.87
12:46:03.7461600 -09:41:28.521600 15.12