GCN Circular 34567
Subject
GRB 230826A: Mondy optical observations
Date
2023-08-27T01:28:38Z (a year ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
Via
legacy email
N. Pankov (HSE, IKI), E. Klunko (ISTP), A. Pozanenko (IKI), S. Belkin (IKI) on behalf of GRB-IKI-FuN report.
We observed the field of GRB 230826A detected by Fermi GBM (Fermi GBM Team, GCN 34564) and Swift (Eyles-Ferris et al, 34565) with AZT-33IK telescope of Sayan observatory (Mondy). Observations started on 2023-08-26 220:06:00 (UT) (i.e. ~33 min since trigger). We obtained
series of images in R-filter. We do not detect evident candidate within XRT error circle (Swift-XRT Position: +05h 32m 14.20s +66d 07' 30.0" 5.3 arcsec, radius) in a stacked image. Preliminary photometry is following:
Date UT start t-T0 Filter Exp. OT Err. UL(3sigma)
(mid, days) (s)
2023-08-26 20:06:00 0.038345 R 44*60 n/d n/d 22.0
We note the presence of the object USNO-B1.0 1561-0095652 at 8.8 arces from the Swift-XRT Position. Measured brightness of the object is R = 18.1 +/- 0.01 what is brighter than USNO-B1.0 R2=18.22 magnitude.
All photometry is based on nearby USNO-B1.0 stars, R2 magnitudes