{
  "eventId": "GRB 250101A",
  "submittedHow": "web",
  "submitter": "ankur ghosh at CAPP, University of Johannesburg <ghosh.ankur1994@gmail.com>",
  "bibcode": "2025GCN.38779....1G",
  "createdOn": 1735836991547,
  "body": "Ankur Ghosh, Soebur Razzaque (CAPP, University of Johannesburg),  Rahul Gupta (NASA GSFC),  Alexander Moskvitin, Yulia Sotnikova (SAO RAS), Naveen Dukiya (ARIES) on behalf of a larger collaboration. \n\nWe observed the field of the GRB 250101A triggered by Swift (Page et. al., GCN 38752) in B, V  filter of  the 1-meter Sinistro telescope at the Las Cumbres Observatory Global Telescope (LCOGT) node located at McDonald Observatory. The 1-m Sinistro telescope is equipped with a 4K x 4K CCD (FOV: 26 x 26 arcmin, scale: 0.39 arcsec/pixel).\nObservations began on January 02, 2025, starting from 14.48 hours after the GRB trigger.\n\nWe clearly detect the optical transient (OT) reported by GCNs (Li et al., GCN 38753; Mohan et al., GCN 38754; Zhu et al., GCN 38755; Budnev et al., GCN 38756; Wu et al., GCN 38758; Moskvitin et al., GCN 38762; Odeh et al., GCN 38763, Hu et al., GCN 38764; D'Avino et al., GCN 38768; Escudero-Coca et al., GCN 38769, Coca et al., Zhang wt al., GCN 38774, Komesh et al., GCN 38777) in our B, V band image. \n\n|Date|\t\t|UTstart|\t|t-T0 (hours)|\t|Exp (sec)|\t|Filter|\t|Magnitude| \n---------------------------------------------------------------------------------------------------      \n2025-01-02\t03:51:30.528\t14.48\t\t1 x 900 \tV\t\tV = 20.61 +/- 0.04\n2025-01-02\t06:19:33.312\t16.95\t\t2 x 1200\tB\t\tB = 21.82 +/- 0.03\n\nThe field was calibrated against nearby APASS stars, with magnitudes converted using Lupton (2005) equations, and has not been corrected for Galactic extinction.\n",
  "circularId": 38779,
  "format": "text/plain",
  "subject": "GRB 250101A: LCO optical counterpart detection"
}