GCN Circular 18533
Subject
GRB 151027A: Optical counterpart detection
Event
Date
2015-10-29T21:34:24Z (10 years ago)
From
Valentyna Golovnya at Main Astro Obs,Kyiv <golov_v@ukr.net>
Yu. Protsyuk (RI NAO), O. Kovalchuk (RI NAO) report:
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We observed the field of the Swift GRB 151027A (Maselli et al.
GCN 18478) with 0.5-m telescope Mobitel KT-50 of Nikolaev observatory
with Alta-U9000 CCD-camera with R filter in robotic mode
from Oct., 28 (UTC) 20:34:16 till 20:59:59.
We obtained 19 unfiltered images of 60 s exposure and calculated
coordinates and magnitudes of all detected objects in UCAC4 system.
We don't detect any optical counterpart of GRB 151027A (Maselli et al.
GCN 18478; Zheng and Filippenko, GCN 18479) in coordinates near (J2000)
18 09 56 +61 21 12 up to ~17.2- 17.5 m .
After that we filtered all images and detected optical
counterpart��in 6 images��in coordinates (J2000)
18 09 56.680 (SD=0.s081) +61 21 12.08 (SD=0."63)
with brightness near 18.3m (SD=0.3m)