GCN Circular 26790
Subject
GRB 200115A: Mondy optical afterglow candidate
Date
2020-01-16T18:22:00Z (5 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Pozanenko (IKI), A. Volnova (IKI), E. Klunko (ISTP), K. Kamyshnikov
(HSE), N. Pankov (HSE), E. Mazaeva (IKI), S. Belkin (IKI) report on
behalf of GRB IKI FuN:
We observed the field of GRB 200115A (Cenko et al. GCN 26771) with
AZT-33IK telescope of Sayan observatory (Mondy) starting on Jan. 15 (UT)
11:55:00, i.e. 4.6 minutes after GRB trigger. Within BAT
ground-calculated position (Laha et al. GCN 26780) we detected the
only one unidentified object at the coordinates (J2000) 03:45:46.58
+05:36:36 with uncertainty of 0.5 arcsec in both coordinates. The object
is absent in SDSS DR12. At this time we cannot confirm variability of
the object. We suggest the object is the optical afterglow of GRB
200115A. Preliminary photometry of the afterglow candidate is following.
Date UT start t-T0 Filter Exp. OT Err. UL(3sigma)
(mid, days) (s)
2020-01-15 11:55:00 0.02455 R 30*120 20.9 0.2 22.1
The photometry is based on the nearby SDSS DR12 stars
SDSS R_Lupton
J034551.63+053704.5 17.138 0.016
J034547.51+053555.6 18.214 0.029
J034543.70+053549.4 17.851 0.022