GCN Circular 43884
Subject
EP260227A: 3.6m DOT optical afterglow detection
Event
Date
2026-03-01T07:52:34Z (10 days ago)
From
ANSHIKA GUPTA at ARIES <anshika05180@gmail.com>
Via
Web form
Anshika Gupta, Dhruv Jain, Pankaj Pawar, Debalina Kar, and Kuntal Misra (ARIES) report:
We observed the field of EP260227A detected by Einstein Probe WXT (Wang et al., GCN 43869) with the 3.6m Devasthal Optical Telescope (DOT), located at the Devasthal Observatory of the Aryabhatta Research Institute of Observational Sciences (ARIES), India. The observations were started on 2026-02-28 at 21:17:26 UT, i.e., ~25.08 hours after the EP/WXT trigger. We have taken multiple frames with an exposure time of 300s in the R filter. We stacked the images after the alignment. We detect an optical counterpart in our stacked image at the position given by the Eyles-Ferris et al. (GCN 43867). We obtain the following preliminary magnitude in the stacked image:
Date Start_UT T_start-T0 (hours) Filter Exp time (s) Magnitude
==================================================================
2026-02-28 21:17:26 ~25.08 R 300s*24 22.92 +/-0.06
Our detection is consistent with Eyles-Ferris et al. (GCN 43867); Li et al. (GCN 43868); Lipunov et al. (GCN 43870); Fu et al.(GCN 43873); Mandarakas et al. (GCN 43874); Eyles-Ferris and N. R. Tanvir et al. (GCN 43875); Malesani et al. (GCN 43876); Eyles-Ferris et al. (GCN 43877); Strausbaugh et al. (GCN 43879); Bochenek et al. (GCN 43880); Gassert et al. (GCN 43881).
The magnitude is not corrected for the Galactic extinction in the direction of the burst.
Photometric calibration is performed using the standard stars from the USNO-B1.0 catalog.