GCN Circular 31520
Subject
GRB 220117A: Terskol and AbAO optical upper limits
Event
Date
2022-01-23T16:24:09Z (3 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Volnova (IKI), I. Sokolov (INASAN, KIAM), I. Izvekova (Institute of
Physics of NAS, ICAMBR of NAS), A. Shein (INASAN), Y. Markus (Institute
of Physics of NAS, ICAMBR NAS), Y. Markelov (KIAM), R. Ya. Inasaridze
(AbAO), N. Pankov (HSE), G. Butenko (ICAMBR NAS), S. Belkin (IKI,
HSE), A. Pozanenko (IKI) report on behalf of GRB IKI:
We observed the field of GRB 220117A (Melandri et al., GCN 31466) also
detected by Fermi GBM Sub-Threshold (Veres, GCN 31487), and Konus-Wind
(Frederiks et al. GCN 31511) with Zeiss-2000, Zeiss-600 and K-800
telescopes of Terskol observatory and with AS-32 telescope of Abastumani
observatory. Within the enhanced XRT Swift-XRT error circle (Beardmore
et al., GCN 31472) we did not find any optical source. In particular we
do not find the afterglow reported by Nanshan/NEXT (Fu et al., GCN
31467), VLT (Palmerio et al., GCN 31480), LCO (Strausbaugh et al., GCN
31481). Preliminary upper limits are following
Date UT start t-T0 Filter Exp. OT Err UL(3sigma) Telescope
2022-01-17 18:32:01 0.12671 R 90*60 n/d n/d 19.3 Zeiss-600
2022-01-17 19:41:36 0.16134 R 19*180 n/d n/d 20.5 Zeiss-2000
2022-01-17 20:53:30 0.20545 R 35*60 n/d n/d 19.4 AS-32
The photometry is based on the nearby PS1 stars.