GCN Circular 21300
Subject
GRB 170705A: ISON/Terskol optical observations
Event
Date
2017-07-06T13:28:01Z (8 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), A. Pozanenko (IKI), V. Agletdinov (KIAM), A. Volnova
(IKI), A. Mokhnatkin (KIAM), I. Molotov (KIAM) report on behalf of
larger GRB follow-up collaboration:
We observed the field of the Swift GRB 170705A (Starling et al. GCN 21289)
which is also detected by GBM/Fermi and Konus-Wind (Bissaldi et al., GCN
21297; Svinkini et al., GCN 21299) with K-800 (0.8m) telescope of
ISON/Terskol observatory starting on July, 05 (UT) 18:30:54. We obtained
several unfiltered images of 20 s exposure. The optical afterglow of GRB
170705A (Starling et al. GCN 21289, Lipunov et al. GCN 21291, Butler et al.
GCN 21293, Emery et al. GCN 21294; Ugarte Postigo et al. GCN 21298) is
clearly visible in a combined image. Preliminary photometry of the
afterglow is following
Date UT start t-T0 Filter Exp. OT Err.
UL
(mid, days) (s)
2017-07-05 18:30:54 0.70649 CR 358*20 19.84 0.08 22.2
Photometry is based on nearby SDSS DR9 stars
SDSS id R_Lupton
J124702.82+181926.7 17.63
J124700.96+181851.9 19.15
J124653.35+182058.9 17.08
J124641.28+182043.7 16.61
J124646.57+181522.1 17.45
J124645.71+181510.4 17.18
J124650.58+182306.3 18.18
J124624.60+181820.0 16.34
J124647.75+181330.6 16.05
J124644.99+181414.3 18.79