[vsnet-grb-info 26405] GRB 200922A: Chilescope optical observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sun Sep 27 01:20:17 JST 2020
TITLE: GCN CIRCULAR
NUMBER: 28505
SUBJECT: GRB 200922A: Chilescope optical observations
DATE: 20/09/26 16:18:20 GMT
FROM: Alexei Pozanenko at IKI, Moscow <apozanen at iki.rssi.ru>
A. Pozanenko (IKI), S. Belkin (IKI), A. Volnova (IKI), P. Minaev (IKI),
N. Pankov (HSE) report on behalf GRB IKI FuN collaboration:
We observed the field of GRB 200922A (Moss et al., GCN 28471) with
RC-1000 Chilescope observatory in r'-filter starting on 2020-09-22 (UT)
23:25:05. In a single obtained image of 1200 s exposure we cannot
resolve the OT reported earlier (Moss et al., GCN 28471; Izzo et al.,
GCN 28478; Siegel et al., GCN 28482; Malesani et al., GCN 28492).
Instead we subtract the flux of nearby star from SkyMapper DR1.1 from
the (nearby star + OT) photometry.
Preliminary photometry of the OT after the above-mentioned procedure is
following.
Date UT start t-T0 Filter Exp. OT(AB) Err. UL(AB)
(mid, days) (s)
2020-09-22 23:25:05 0.478 r' 1200 18.92 0.05 20.7
The photometry is based on nearby SkyMapper DR1.1 stars.
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