{
  "createdOn": 1746187504759,
  "bibcode": "2025GCN.40319....1A",
  "submittedHow": "web",
  "subject": "GRB 250502A: TRT optical afterglow confirmation",
  "format": "text/plain",
  "eventId": "GRB 250502A",
  "body": "J. An (NAOC), K. Noysena, S. Tinyanont, K. Chanchaiworawit (NARIT), S.Y. Fu (HUST), X. Liu, Z.P. Zhu, S.Q. Jiang, D. Xu (NAOC) report on behalf of a large collaboration:\n\nWe observed the field of GRB 250502A detected by SVOM/ECLAIRs (Wang et al., GCN 40313), using the 0.7-m telescope of the Thai Robotic Telescope network (TRT), located at New South Wales, Australia (SBO). Observations started at 10:30:05 UTC on 2025-05-02, i.e., ~1.73 hr after the SVOM trigger and a series of frames in the B/V/R/I bands were obtained. \n\nThe optical afterglow of the burst (Rakotondrainibe et al., GCN 40315) is clearly detected in our individual images. Preliminary photometry shows that the afterglow has decayed to I ~ 18.6 mag at 2.00 hr post-trigger, calibrated with Pan-STARRS DR2 catalog and not corrected for Galactic extinction.\n\nObservations are ongoing.",
  "circularId": 40319,
  "submitter": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>"
}