GCN Circular 25963
Subject
LIGO/Virgo S190930t: Swift J221951-484240 optical photometry of Chilescope observatory
Event
Date
2019-10-06T18:27:57Z (6 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), M. Krugov (AFIF), E. Mazaeva (IKI),
A. Volnova (IKI) report on behalf of IKI-FuN follow-up collaboration:
We observed the Swift J221951-484240 blue Optical Transient (Oates et
al., GCN 25901; Oates et al., GCN 25939) in the field of the
LIGO/Virgo S190930t (LIGO Scientific Collaboration and the Virgo
Collaboration, GCN 25876). Several images were obtained in r' -filter
of RC-1000 telescope. The OT was also previously observed by Kamei et
al. (GCN 25941) and Buckley et al. (GCN 25962). Preliminary photometry
of the Swift J221951-484240 OT is following.
Date UT start MJD Filter Exp. OT Err. UL
(mid, days) (s)
2019-10-05 04:22:44 58761.19808 r' 2700 19.35 0.06 22.7
The photometry is based on the USNO-B1.0 stars (reverse Lupton's
transformation VRI -> r)
USNO-B1.0_id r_Sloan(Lupton)
0412-0779298 16.866
0412-0779234 17.469
0413-0785834 16.580
0413-0785834 17.565
0413-0785847 16.517