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GCN Circular 23844

Subject
GRB 190202A: SAO RAS optical observations
Date
2019-02-03T14:23:55Z (5 years ago)
From
Moskvitin Alexander at SAO RAS <mosk@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.
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