[vsnet-grb-info 21769] GRB 190204A: SAO RAS optical observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Tue Feb 5 04:04:26 JST 2019
TITLE: GCN CIRCULAR
NUMBER: 23868
SUBJECT: GRB 190204A: SAO RAS optical observations
DATE: 19/02/04 19:02:35 GMT
FROM: Moskvitin Alexander at SAO RAS <mosk at sao.ru>
A. S. Moskvitin (SAO RAS)
report on behalf of larger GRB follow-up team.
We observed the field of the GRB 190204A (Lien et al., GCNC #23852)
with the Zeiss-1000 telescope of SAO RAS (+ CCD photometer)
on February, 4, 15:36:17--16:44:07 UT (mid. time 16:10:12).
The observations were carried out in Rc band.
We detected the OT (Lien et al., GCNC #23852; Watson et al.,
GCNC #23861; Kuin & Lien, GCNC #23863)
in the stacked 12 x 300 sec. image.
Preliminary brightness of OT is R = 21.9 +/- 0.1 (T-T0 = 0.4335 d).
The calibrations is based on nearby SDSS stars (Volnova et al.,
GCNC #23867), magnitudes converted with the Lupton 2005 equations.
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