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GCN Circular 31586

GRB 220210A: Mondy, AbAO and Terskol optical upper limits
2022-02-12T22:20:24Z (2 years ago)
Alexei Pozanenko at IKI, Moscow <>
N. Pankov (HSE), A. Pozanenko (IKI), E. Klunko (ISZF),  R. Ya. 
Inasaridze (AbAO), 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),  G. Butenko (ICAMBR 
NAS), S. Belkin (IKI, HSE) report on behalf of GRB IKI:

We observed the field of Swift/BAT-GUANO localization (Tohuvavohu et 
al.,  GCN 31572) of GRB 220210A (Fermi GBM team, GCN 31568) with 
AZT-33IK telescope of Mondy observatory, AS-32 telescope of Abastumani 
observatory, and Zeiss-2000 telescope in R-filter. Within localization 
area (Tohuvavohu et al.,  GCN 31572) we do not detect evident candidate 
in comparison with SDSS DR12 catalogue. The object reported by BOOTES 
team (Carrasco-Garcia et al., GCN 31573) is clearly visible in all of 
our observations and do not show significant variability  with R= 20.17 
+/- 0.14 (0.54116 d),  R= 20.05 +/- 0.13 (0.72701 d), and R=20.14 +/- 
0.13 (0.77438 d). This highly reddened object visible in DDS-2 Infrared 
Survey (Carrasco-Garcia et al., GCN 31574) is also presented in SDSS 
DR12 as a star-like very red object with r=21.187.

Preliminary photometry of the field is following

Date UT start t-T0 Filter Exp. OT Err UL(3sigma) Telescope

2022-02-11 12:32:54 0.54116 R    23*120  n/d   n/d   22.7 AZT-33IK
2022-02-11 16:58:32 0.72701 R     50*60  n/d   n/d   21.9 AS-32 
2022-02-11 19:41:36 0.77438 R    35*180  n/d   n/d   22.2 Zeiss-2000

The photometry is based on the nearby USNO-B1.0 stars
345.7846139 61.8542256 14.69
345.7584140 61.8282804 17.76
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