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GCN Circular 23870

Subject
GRB 190202A: SAO RAS further optical observations
Date
2019-02-04T19:53:15Z (5 years ago)
From
Moskvitin Alexander at SAO RAS <mosk@sao.ru>
A. S. Moskvitin, O. I. Spiridonova, O. A. Maslennikova (SAO RAS),
and A. A. Volnova (IKI 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, 21:15:42--22:45:25 UT (mid. time 22:00:33).
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; Moskvitin & Spiridonova, GCNC #23844;
Brajesh Kumar et al., GCNC #23853) in the stacked 15 x 300 sec image.

Preliminary brightness of OT is R = 21.9 +/- 0.1 (T-T0 = 1.848 d).
The calibrations is based on nearby SDSS stars, magnitudes converted
with the Lupton 2005 equations.
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