GCN Circular 37401
Subject
GRB 240905E: SAO RAS optical upper limit
Date
2024-09-05T21:26:52Z (a month ago)
From
Moskvitin Alexander at SAO RAS <mosk@sao.ru>
Via
legacy email
A. S. Moskvitin and O. I. Spiridonova (SAO RAS)
report on behalf of the GRB follow-up team.
We observed the field of GRB 240905E (Dichiara et al., GCN 37397)
using SAO RAS 1-meter telescope Zeiss-1000 equipped with
the New CCD-photometer. The observations started 2024-09-05T18:50:23,
24.3 min after the Swift trigger. We obtained 10 x 60 + 4 x 300 sec.
images in Rc band (t_mid - T0 = 0.69 hours).
Within the XRT error circle (Dichiara et al., GCN 37397) we did not
detect any source down to a limiting magnitude of R_lim = 22.8
calibrated against nearby Pan-STARRS stars (magnitudes converted
to R band) and not corrected for the MW extinction.