GCN Circular 25943
Subject
LIGO/Virgo S190930t: AT2019rpn, AT2019rpj CrAO continued optical photometry
Event
Date
2019-10-04T16:31:19Z (6 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), A. Pozanenko (IKI), V. Rumyantsev (CrAO), S. Belkin
(IKI), A. Volnova (IKI) report on behalf of larger GRB follow-up
collaboration:
We observed the ZTF19acbpqlh (AT2019rpn) reported by Stein et al. (GCN
25899) and the ATLAS19wyn (AT2019rpj) optical transients with ZTSh 2.6m
telescope of CrAO observatory on Oct. 02 and Oct. 3.
Preliminary photometry of the optical transients is following
(we repeat our photometry previously published in GCN 25928 in the table
below for convenience)
Name, UT start T_mid Filter Exp. OT err
(MJD) (s)
AT2019rpj 2019-10-01 20:16:16 58757.84880 R 11*60 19.37 0.04
AT2019rpj 2019-10-01 20:28:33 58757.85886 B 15*60 19.86 0.04
AT2019rpj 2019-10-02 19:44:58 58758.82668 R 10*60 19.31 0.05
AT2019rpj 2019-10-02 20:28:33 58758.83825 B 20*60 19.83 0.03
AT2019rpj 2019-10-03 17:56:18 58759.75245 R 12*60 19.33 0.06
AT2019rpj 2019-10-03 18:11:03 58759.76604 B 22*60 19.91 0.06
AT2019rpn 2019-10-01 19:30:53 58757.81861 R 12*60 19.26 0.11
AT2019rpn 2019-10-01 19:47:03 58757.83270 B 11*60 20.17 0.07
AT2019rpn 2019-10-02 19:01:22 58758.79640 R 10*60 19.34 0.12
AT2019rpn 2019-10-02 19:12:33 58758.80874 B 22*60 20.20 0.04
AT2019rpn 2019-10-03 17:13:26 58759.72220 R 10*60 19.26 0.12
AT2019rpn 2019-10-03 17:26:42 58759.73485 B 21*60 20.18 0.05
The photometry is based on the same stars reported by Mazaeva et al.
(GCN 25928).
The color of AT2019rpj (B-R) = 0.5 is not resemble of any object which
can be related to LVC OT counterpart, and the detection the AT2019rpj
before S190930t (Smartt et al. GCN 25922), exclude it from candidates.
Based on the photometry, it can be seen that AT2019rpn does not rise for
three epochs (which is previously reported by Tan et al. (GCN 25916)) or
is near a maximum.