EP240416A: Terskol Zeiss-2000 optical upper limit
Abstract
We observed the EP240416A (Cheng et al., GCN 36138) with the Zeiss-2000 telescope of Terskol observatory in R-filter starting on on 2024-04-16 (UT) 21:21:18. We did not detect the optical counterpart (Chen et al., GCN 36139; An et al., GCN 36144) down to the limiting magnitude of R~21.9. 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 21:21:18 0.79832 70x90 R n/d n/d 21.9 The photometry is based on nearby USNO-B1.0 stars. USNO-B1.0 RA DEC R2 13:32:30.1848000 -13:36:51.350400 13.67 13:32:25.6521600 -13:39:02.671200 14.26 13:32:19.2355200 -13:39:27.943200 13.96
- Publication:
-
GRB Coordinates Network
- Pub Date:
- April 2024
- Bibcode:
- 2024GCN.36158....1B