[vsnet-grb-info 21745] GRB 190202A: SAO RAS optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23844
SUBJECT: GRB 190202A: SAO RAS optical observations
DATE:    19/02/03 14:23:55 GMT
FROM:    Moskvitin Alexander at SAO RAS  <mosk at sao.ru>

A. S. Moskvitin and O. I. Spiridonova (SAO RAS)
report on behalf of larger collaboration.

We observed the field of the GRB 190202A (Lien et al., GCNC #23830)
with the Zeiss-1000 telescope of SAO RAS (+ CCD photometer)
on February, 3, 2:21:17--3:13:27 UT (mid.date 2:47:22).
The observations were carried out in Rc band.

We detected the OT (Novichonok et al., GCNC #23831; Steeghs et al.,
GCNC #23833; Paul Kuin & A. Y. Lien, GCNC #23834; Cucchiara,
GCNC #23839; Paek et al., GCNC #23841; Malesani et al., GCNC #23842;
Belkin et al., 23843) in the stacked 9 x 300 sec image.

Preliminary brightness of OT is R = 21.45 +/- 0.15 (T-T0 = 1.047 d).
The calibrations is based on nearby SDSS stars, magnitudes converted
with the Lupton 2005 equations.