GCN Circular 38733
Subject
GRB 241228B: SAO RAS optical observations
Date
2024-12-30T21:08:56Z (3 days ago)
From
Moskvitin Alexander at SAO RAS <mosk@sao.ru>
Via
Web form
A. S. Moskvitin, O. I. Spiridonova, Yu. V. Sotnikova (SAO RAS),
A. Volnova, A. Pozanenko (IKI), A. Ghosh, S. Razzaque (CAPP,
University of Johannesburg), report on behalf of the GRB follow-up team.
We observed the field of GRB 241228B discovered by Fermi (Fermi GBM
team, GCN 38682; Scotton and Meegan, GCN 38714), Swift (Evans,
GCN 38688; Burrows et al., GCN 38713) with the 1-m telescope of SAO RAS
Zeiss-1000 equipped with the CCD-photometer on December 29, 21:49:11 --
22:57:57 UT (t_mid - T0 = 1.7573 days). We obtained 12 x 300 sec.
images in Rc band.
The GOTO24jmz optical counterpart (Kumar et al., GCN 38684, GCN 38691;
An et al. GCN 38687; Ortega-Casas et al., GCN 38692; Ghosh et al.,
GCN 38702; An et al., GCN 38704; Volnova et al., GCN 38709;
Strobl and Jelinek, GCN 38715) is clearly detected in the stacked image
with the brightness of R = 20.97 +/- 0.06. Based on photometry in R
filter (this report and photometry by Volnova et al., GCN 38709)
we found that the light curve of the afterglow of GRB 241228B/GOTO24jmz
can be fitted with a simple power-law model
with an power law index of -0.66.
The photometry is based on nearby SDSS stars used by Volnova et al.,
GCN 38709 (magnitudes were converted with Lupton 2005 equations).