[vsnet-grb-info 27743] GRB 210420B: Optical observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Wed Apr 21 05:39:01 JST 2021
TITLE: GCN CIRCULAR
NUMBER: 29846
SUBJECT: GRB 210420B: Optical observations
DATE: 21/04/20 20:37:21 GMT
FROM: Arto Oksanen at Nyrola Obs., Finland <oksanen at nyrola.jklsirius.fi>
A. Oksanen (Hankasalmi observatory) report on behalf a larger collaboration:
We observed the field of the Swift GRB 210420B (Page et al., GCN 29844)
using the 0.40 m remote controlled RC telescope of Hankasalmi observatory
equipped with the SBIG STX-16803 CCD camera. Total of 25 exposures of 60 s
each were secured in the clear filter, starting on 2021 April 19:44:58 UT.
A candidate afterglow is clearly detected in the XRT error circle with
coordinates (J2000):
RA = 16:57:18.0
DEC = +42:34:12.6
Its magnitude is r = 17.97 +- 0.05 , calibrated against a nearby star
from SDSS. This object is not visible in the Digitized Sky Survey R band
images.
We consider this object as a viable afterglow candidate to GRB 210420B,
but a confirmation is necessary to assess variability. Further
observations are planned.
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