GCN Circular 25212
Subject
LIGO/Virgo S190728q: ZTF19abjethn TShAO and NUTTelA-TAO optical observations / classification
Date
2019-07-29T01:03:07Z (5 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), I. Reva (AFIF), M. Krugov (AFIF), A. Pozanenko (IKI),
B. Grossan (ECL) report on behalf of larger GRB IKI FuN collaboration:
We observed the optical transient AT2019lvs/ZTF19abjethn
discovered by ZTF (Kasliwal et al. GCN 25199) with TShAO Zeiss-1000 and
CDK700 telescope (NUTTelA-TAO) of Assy-Turgen observatory. Observations
started earlier than Update on Sky-Localization (LVC, GCN 25208). We
observed the transient in B,R - filters. The transient photometry is
following.
Date, UTC, MJD, Filter, Exposure, OT, Err, Uplim, FWHM Obs., Telescope
2019-07-28 16:04:19 58692.65864 R 23*120 16.63 0.02 21.5 2.1 TSHAO
Zeiss-1000
2019-07-28 17:15:10 58692.72234 R 5*120 16.49 0.03 21.3 1.8 Assy-Turgen
CDK700
2019-07-28 17:17:18 58692.72729 B 10*120 16.35 0.07 21.0 1.8 Assy-Turgen
CDK700
2019-07-28 20:29:12 58692.86056 B 10*120 15.51 0.09 21.0 2.8 Assy-Turgen
CDK700
The photometry is based on the nearby USNO-B1 (R2) stars.
The extremely blue color of the transient (B-R) = -0.15 is fully agreed
with classification of the transient as CV (Magee et al., GCN 25209).