GCN Circular 31628
Subject
ZTF22aabjpxh/AT2022cva: Assy optical observations
Event
Date
2022-02-22T00:16:49Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
V. Kim (FAI, HSE), A. Pozanenko (IKI), M. Krugov (FAI), I. Reva (FAI),
N. Pankov (HSE, IKI), S. Belkin (IKI) report on behalf of GRB IKI FuN:
We observed ZTF22aabjpxh/AT2022cva transient (Ho et al., GCN 31619) what
is considered the likely afterglow of GRB 220219B (Ho et al., GCN 31619;
Svinkin et al., GCN 31624) with AZT-20 telescope of Assy-Turgen
observatory starting on 2022-02-21 (UT) 19:44:30.
We clearly detect the SDSS galaxy at photo_z = 0.248 (Ho et al., GCN
31619). Due to non-optimal seeing (FWHM of about 2.4") we could not
discriminate the afterglow source from the galaxy. We use aperture
photometry and preliminary photometry (AB) of a source (afterglow+host
galaxy) is following
Date UT start JD Exp. Filter OT Err. UL(3sigma)
(mid, days) (s)
2022-02-21 19:44:30 2459632.327 40*60 r' 19.20 0.03 22.1
2022-02-21 21:57:59 2459632.416 40*60 r' 19.45 0.02 22.7
The photometry is based on nearby PS1 stars
id r
J160337.10+311328.5 16.987
J160343.10+311452.9 18.700
The photometry of the the source is brighter than reported either in PS1
or SDSS DR12, and source is variable. We can conclude that the
afterglow is detected and dominate over host galaxy brightness.