GCN Circular 34487
Subject
GRB 230818A: KGO RC-25 optical observations
Event
Date
2023-08-19T10:06:00Z (2 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
Via
legacy email
N. Pankov (HSE, IKI) A. V. Samokhvalov (citizen scientist, Surgut),
A. Pozanenko (IKI), S. Belkin (IKI, HSE) report on behalf of GRB IKI FuN:
We observed the field of GRB 230818A (Swift: Tohuvavohu et al., GCN 34479; Fermi: GBM team, GCN 34478) with 25cm telescope of KGO observatory. Observation started on 2023-08-18 23:42:15, i.e. 14.5 minutes after GRB trigger. The series consist of images with an exposure of 600 s in R-filter. WE clearly detect the afterglow (Lipunov et al., GCN 34476; Gompertz et al., GCN 34480; Moskvitin et al., GCN 34483; Malesani et al., GCN 34485; Siegel et al., GCN 34486). Preliminary photometry of images is following
Date UT-start Exptime Filter t-T0 OT Err UL
sec days
2023-08-18 23:42:15 1*600 R 0.013667 18.7 0.2 19.3
2023-08-18 23:52:24 6*600 R 0.038080 19.8 0.3 19.9
Ref.stars
PanSTARRS-DR1
RA Dec r i R(Lupton transformation)
19:03:22.0694 +40:55:31.814 14.1600 14.0074 13.97
19:04:17.2714 +40:50:28.744 14.8986 14.7352 14.71