TITLE: GCN CIRCULAR NUMBER: 43063 SUBJECT: EP251124a: Mondy optical upper limit DATE: 25/12/10 11:55:55 GMT FROM: Alina Volnova at IKI RAS alinusss@gmail.com
A. A. Volnova (IKI), E. Klunko (ISTP), A. S. Pozanenko, N. S. Pankov (HSE, IKI) (IKI) report on behalf of IKI-GRB-FuN:
We observed the field of the EP251124a triggered by EP/WXT (Zhou et al., GCN 42816; GCN 42832) with the AZT-33IK 1.5m telescope of the Sayan Solar Observatory (Mondy) taking several 120-second expositions in R-band starting on Nov.24 UT 14:36:01 in the R filter. In the error boxes reported by Zhou et al. (GCN 42816) we do not detect any new optical transient in the stacked frame. The photometry and observational details are the following:
Date UT start t-T0 Exp. Filter UL Site/Telescope (mid,days) (n*s) (3sigma) 2025-11-24 14:36:01 0.16386 30*120 R 22.3 Mondy/AZT-33IK
The photometry is based on several nearby stars from the USNO-B1 catalogue (R2 magnitudes) and is not corrected for the Galactic extinction.
Our upper limit is in agreement with previously reported limits (Mohan et al., GCN 42817; Wang et al., GCN 42824; Lipunov et al., GCN 42828; van Hoof et al., GCN 42829; Ma et al, GCN 42833; Gillanders et al., GCN 42862).
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