GCN Circular 37370
Subject
GRB 240828A: SAO RAS AS-500(2) optical observations
Date
2024-09-01T21:05:37Z (2 months ago)
From
Moskvitin Alexander at SAO RAS <mosk@sao.ru>
Via
legacy email
A. S. Moskvitin and V. V. Vlasyuk (SAO RAS),
report on behalf of the GRB follow-up team.
We observed the field of GRB 240828A (Fermi GBM team, GCN 37317;
Srijan et al., GCN 37328; Gupta and Di Lalla, GCN 37331;
Beardmore et al., GCN 37337; Dalessi and Meegan GCN 37341)
with the AS-500(2) 0.5-m Ritchey-Chretien telescope of SAO RAS
equipped with CCD-photometer and Andor iXon Ultra EM-CCD DU-897
camera with 512x512 pixels E2V chip. We obtained 40 x 90 sec. images
in Rc band on August 31 (2024-08-31T18:44:29 -- 2024-08-31T19:59:08),
t_mid - T0 = 3.1852 days.
The OT (Zheng and Filippenko, GCNs 37339, 37349; Moskvitin
and Spiridonova, GCN 37344) is marginally detected in our stacked
frame with the brightness of R = 21.8 +/- 0.3 calibrated against
nearby SDSS stars (magnitudes converted with Lupton 2005 equations)
and not corrected for the MW extinction.