GCN Circular 30465
Subject
GRB 210704A: Zeiss-1000/SAO-RAS optical observations
Date
2021-07-17T14:02:10Z (3 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Volnova (IKI), A. Moskvitin (SAO RAS), A. Pozanenko (IKI), N. Pankov
(IKI, HSE), S. Belkin (IKI, HSE) report on behalf of GRB IKI FuN:
We observed GRB 210704A (Ursi et al., GCN 30372; Berretta et al., GCN
30375; Prasad et al., GCN 30378; D'Ai et al., GCN 30379; Malacaria et
al., GCN 30380; Ridnaia et al., GCN 30388) with Zeiss-1000 telescope of
SAO RAS observatory on 2021-07-11 and 2021-07-13. We marginally
detect the optical afterglow (Kim et al., GCN 30384; D'Avanzo et al.,
GCN 30385; Troja et al., GCN 30390; Kann et al., GCN 30391, 30401; Sun
et al., GCN 30411; D'Avanzo et al., GCN 30432; Rastinejad et al., GCN
30433; Watson et al., GCN 30436; Pankov et al., GCN 30440; Troja et
al., GCN 30442; Kann et al., GCN 30443; Fong et al., GCN 30445; O'Connor
et al., GCN 30451).
Preliminary photometry of the afterglow is following
Date UT start t-T0 Filter Exp. OT err UL(3 sigma)
(mid, days) (s)
2021-07-11 18:38:22 6.98262 R 12*300 23.1 0.3 23.2
2021-07-13 18:16:08 8.94635 R 24*300 23.8 S/N=2 23.5
The photometry is based on nearby USNO_B-1.0 stars
USNO_B-1.0_id R2
1471-0248922 16.31
1471-0248878 17.04