[vsnet-grb-info 19212] GRB 170317A: Mondy optical observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Mar 18 01:49:43 JST 2017
TITLE: GCN CIRCULAR
NUMBER: 20893
SUBJECT: GRB 170317A: Mondy optical observations
DATE: 17/03/17 16:48:01 GMT
FROM: Alexei Pozanenko at IKI, Moscow <apozanen at 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
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