TITLE: GCN CIRCULAR NUMBER: 44348 SUBJECT: EP260321A/AT2026gzf: Optical observation from 1.3m DFOT DATE: 26/04/19 09:06:27 GMT FROM: ANSHIKA GUPTA at ARIES <anshika05180@gmail.com> Anshika Gupta, Pankaj Pawar, Divyanshu Janghel, Dhruv Jain, Debalina Kar, and Kuntal Misra (ARIES) report: We observed the field of EP260321A/AT2026gzf detected by EP-WXT (Huang, GCN 44068) with the 1.3m Devasthal Fast Optical Telescope (DFOT), located at the Devasthal Observatory of the Aryabhatta Research Institute of Observational Sciences (ARIES), India. Observations began on 2026-04-16 at 14:22:58 UT, i.e., ~26.07 days 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 afterglow in our stacked image. We obtain the following preliminary magnitude in the stacked image: Date Start_UT T_start-T0 (days) Filter Exp time (s) Magnitude ================================================================= 2026-04-16 14:22:58 ~26.07 R 300s*4 17.14 +- 0.01 The optical detection of the burst is consistent with Lipunov et al., GCN 44069; Lee et al., GCN 44070; Aryan et al., GCN 44081; Tanvir et al., GCN 44082; Moran et al., GCN 44083; Ahumada et al., GCN 44084; Liu et al., GCN 44087; Sankar et al. GCN 44089; de Ugarte Postigo et al., GCN 44091; Xu et al., GCN 44092; Pankov et al. GCN 44103; Corcoran et al., GCN 44105; Rastinejad et al., GCN 44107; Gao et al., GCN 44110; He et al., GCN 44117; Zhang et al., GCN 44171; Li et al., GCN 44284; Volnova et al., GCN 44295. 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. View this GCN Circular online at https://gcn.nasa.gov/circulars/44348. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...