GCN Circular 31420
Subject
GRB 220101A: SAO RAS optical observations
Event
Date
2022-01-09T14:22:05Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. S. Moskvitin (SAO), N. Pankov (HSE, IKI), A. S. Medvedev (SAO), S.
Belkin (IKI), A. Pozanenko (IKI) report on behalf of GRB IKI FuN:
We observed Swift GRB 220101A (Tohuvavohu, et al., GCN 31347) also
detected by Fermi/LAT (Arimoto et al. 2022, GCN 31350), AGILE (Ursi et
al. 2022, GCN 31354), and Fermi/GBM (Lesage et al. 2022, GCN 31360) with
Zeiss-1000 telescope of SAO RAS in Rc-filter starting on 2022-01-08 (UT)
15:40:16.
We detected the afterglow (Tohuvavohu et al., GCN 31347; Kuin &
Tohuvavohu, GCN 31351; Fu et al., GCN 31353; Hentunen et al., GCN
31356; Perley et al., GCN 31357; de Ugarte Postigo et al., GCN 31358;
Fynbo et al., GCN 31359; Vinko et al., GCN 31361; Tomasella et al., GCN
31363; Mao et al., GCN 31364; Noschese et al., GCN 31366; Mao et al.,
GCN 31368; Guelbenzu, et al., GCNs 31370, 31401; Strausbaugh et al., GCN
31371; D'Avanzo et al., GCN 31373; Strausbaugh et al., GCNs 31383,
31389; Dimple et al., GCN 31384; Romanov, GCN 31387; Caballero-Garcia,
GCN 31388; Belkin et al., GCNs 31390, 31398; Gupta et al., GCN 31394;
D'Avanzo et al., GCN 31395) in a stacked image.
Preliminary photometry of the afterglow is following
Date UT start t-T0 Filter Exp. OT Err. UL(3sigma)
(mid, days) (s)
2022-01-08 15:40:16 7.46534 Rc 16*300 22.8 0.3 23.2
The photometry is based on the nearby SDSS-DR12 stars
RA DEC R(Lupton transformations)
00:05:20.64408 +31:45:46.0728 18.562
00:05:34.81464 +31:45:50.5224 15.734
00:05:32.53944 +31:44:51.9396 15.369
00:05:36.69864 +31:44:42.4176 14.677