TITLE: GCN CIRCULAR NUMBER: 38109 SUBJECT: EP241101a: CrAO ZTSH optical observations DATE: 24/11/07 03:48:50 GMT FROM: Alexei Pozanenko at IKI, Moscow grb.alex@gmail.com
N. Pankov (HSE, IKI), A. Pozanenko (IKI), V. Rumyantsev (CrAO) report on behalf of GRB-IKI-FuN collaboration:
We observed the EP241101a detected by EP-WXT (Liang et al., GCN 38039) with the 2.6-meter ZTSh telescope of CrAO in the R-filter. The observations were carried out on 02.11.2024 and 03.11.2024. We found several OT candidates entire the EP-WXT localization area. In particular the source (PS1 catalog PSO J037.7952+22.7485) reported by Busmann et al., GCN 38064 and the source reported by Adami et al., GCN 38060 were also marked as candidates in our preliminary analysis. And we do not find any sources within the enhanced localization area of EP-FXT (Wu et al., GCN 38073). Preliminary photometry of the sources and upper limits are the following:
Date UT start TO+ Exp. Filter GCN#38064 GCN#38064 UL(3) (mid, days) (s) OT OT
2024-11-02 23:59:22 1.03548 46x120 R 19.98+-0.05 n/d 21.0 2024-11-03 21:18:54 1.91711 36x120 R 20.47+-0.02 21.88+-0.04 22.0
Photometry is calibrated using nearby USNO-B1.0 stars (R2 magnitude).
Based on our observations and previously reported candidates, we cannot suggest an obvious candidate for OT EP341101a.
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