[vsnet-grb-info 26579] GRB 201017A: Assy and Mondy optical observations, possible afterglow detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sun Oct 18 19:37:43 JST 2020
TITLE: GCN CIRCULAR
NUMBER: 28679
SUBJECT: GRB 201017A: Assy and Mondy optical observations, possible afterglow detection
DATE: 20/10/18 10:36:43 GMT
FROM: Alexei Pozanenko at IKI, Moscow <apozanen at iki.rssi.ru>
S. Belkin (IKI), V. Kim (AFIF, Pulkovo Observatory), A. Pozanenko (IKI),
E. Klunko (ISTP), M. Krugov (AFIF), N. Pankov (HSE), A. Volnova (IKI)
report on behalf of IKI GRB FuN:
We observed the filed of GRB 201017A (Fermi GBM Team, GCN 28665; D'Ai
et al., GCN 28666; Poolakkil et al., GCN 28675) with AZT-33IK telescope
of Mondy observatory in R-filter starting on Oct. 17 (UT) 14:56:22 and
with AZT-20 telescope of Assy-Turgen observatory starting on Oct. 17
(UT) 14:15:45 in r' -filter. At the edge of enhanced Swift-XRT
position (Goad et al., GCN 28671) we marginally detected the object
which is absent in any Pan-STARRS images and PS1 catalog. Position of
the object is (J2000) 02:26:28.31 +66:40:44.74 with uncertainty of 0.5"
in each coordinate.
Preliminary photometry of the afterglow candidate is following
Date UT start t-T0 Filter Exp. OT Err. UL (3sigma)
(mid, days) (s)
2020-10-17 14:15:45 0.2043 r'(AB) 50*60 22.9 0.3 23.2 (AZT-20)
2020-10-17 14:56:22 0.2362 R 30*120 n/d n/d 21.8 (AZT-33IK)
The photometry is based on the nearby stars of PanSTARRS-PS1 catalog.
RA DEC r
02:26:33.94915 +66:39:38.3372 16.1111
02:26:39.68479 +66:38:36.3089 17.4493
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