[vsnet-grb-info 21821] GRB 190219A: CrAO and AbAO optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23920
SUBJECT: GRB 190219A: CrAO and AbAO optical upper limit
DATE:    19/02/21 18:44:49 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

A. Volnova  (IKI),  S. Nazarov (CrAO), S. Schmalz (KIAM), R. Ya. 
Inasaridze (AbAO),  A. Pozanenko (IKI),  S. Belkin (IKI), E. Mazaeva 
(IKI),  I. Molotov (KIAM) report on behalf of  IKI-GRB-FuN  collaboration:

We observed the field of GRB 190219A (Beardmore et al., GCN 23902) with 
AZT-8 of CrAO,  AS-32 (0.7m) telescope of Abastumani Observatory and 
ORI-22 telescope of ISON-Castelgrande Observatory, first observation 
starting on Feb. 19 (UT) 19:48:14.  We do not detect any object within 
enhanced XRT error circle (Beardmore et al., GCN 23907). In particular 
we do not detect the afterglow candidate (Xu et al., GCN 23911). 
Preliminary photometry of the field is following.

date       UT start    t-T0    Filter   Exp. UL         Obs./Tel.
                      (mid, d)           (s) (3 sigma)
2019-02-19 20:14:14  0.02991   R   780      20.3        CrAO/AZT-8
2019-02-20 00:39:36  0.28998   R    95*60   20.8        AbAO/AS-32

The photometry is based on nearby USNO-B1.0 stars.