{
  "subject": "EP261015a: GSP multiband optical follow-up observations",
  "submitter": "fufu Glow <fufuglow70@gmail.com>",
  "editedBy": "Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Jinfu Gou at National Astronomial Observatories,CAS <fufuglow70@gmail.com>",
  "createdOn": 1792682122558,
  "body": "J. F. Gou, W. X. Li, S. J. Xue (NAOC); M. Andrews, D. A. Howell, C. McCully, J. Ridenbaugh and K. Wynn (Las Cumbres Observatory) report:\nWe observed the field of the Einstein Probe fast X-ray transient EP261015a (Li et al., GCNs 45956 and 45969) using MuSCAT3 on the Las Cumbres Observatory (LCO) 2-m Faulkes Telescope North at Haleakala, Hawaii. Observations were obtained simultaneously in g, r, i, and z_s from 2026 October 20, 14:06:51 to 14:29:01 UTC, with four 300-s exposures in each band, approximately 5.0 days after the EP/WXT event onset.\nFollowing subtraction of same-band archival Legacy Survey DR10 templates with HOTPANTS, we detect residual emission at the position of the optical counterpart reported by Corcoran et al., GCNs 45955 and 45972; Fortin et al., GCN 45991; Pawar et al., GCNs 45998 and 46006; Shivaprasad et al., GCN 46000; Pankov et al., GCN 46003. Preliminary PSF photometry using AutoPhOT (Brennan & Fraser 2022), calibrated against nearby Pan-STARRS DR2 stars, gives:\n\n                Magnitude (AB)\n     g            23.51 ± 0.22\n     r            22.26 ± 0.06\n     i          > 22.34 (5 sigma)\n     z          > 22.14 (5 sigma)\n\nThese observations were taken as part of the Global Supernova Project (GSP). ",
  "editedOn": 1792686564931,
  "eventType": [
    "X-ray Transient",
    "Optical Transient"
  ],
  "version": 2,
  "circularId": 46009,
  "eventId": "EP261015a",
  "submittedHow": "web",
  "format": "text/plain"
}