GCN Circular 20893
Subject
GRB 170317A: Mondy optical observations
Date
2017-03-17T16:48:01Z (7 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), A. Volnova
(IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 170317A (LaPorte et al., GCN 20885) with
AZT-33IK telescope of Sayan observatory (Mondy) starting on March, 17
(UT) 13:56:13. We obtained 60 of 60 s exposure images in R-filter.
The optical afterglow (LaPorte et al., GCN 20885; Mazaeva et al., GCN
20886; Xin et al., GCN 20888; Mao et al., GCN 20889) is clearly visible
in stacked images. Preliminary photometry of the afterglow is following
Date UT start t-T0 Filter Exp. OT Err. UL
(mid, days) (s)
2017-03-17 13:56:13 0.18073 R 20*60 20.94 0.10 22.5
The photometry is based on nearby USNO-B.10 stars
Ref.stars
USNO_B1_id R2
1405-0167493 16.10
1405-0167631 15.69
1404-0169027 16.03
1405-0167512 16.85
1404-0169128 16.25