{
  "submittedHow": "web",
  "subject": "GRB 251013C: LCO optical afterglow detection",
  "bibcode": "2025GCN.42229....1P",
  "format": "text/plain",
  "circularId": 42229,
  "body": "J. T. Palmerio, D. Turpin, A. Saccardi, B. Cordier (CEA/Irfu), L. P. Xin (NAOC), C. Wu (NAOC), report on behalf of the SVOM mission team:\n\nWe observed the field of GRB 251013C (SVOM/ECLAIRs and GRM, Rakotondrainibe et al. GCN 42223; Fermi/GBM, Fermi GBM team, GCN 42221) with the LCO 1m telescope at South African Astronomical Observatory equipped with the Sinistro instrument. Our observation started at 2025-10-13T19:27:33.084 about 1.8 hours after the SVOM/ECLAIRs T0 time.\n\nWe obtained 3 series of 3x200 s exposures in the SDSS gri filters. The bright optical counterpart detected by SVOM/VT (Palmerio et al. GCN 42223), BOOTES-6 (Perez-Garcia et al., GCN 42225), LAST (Konno et al., GCN 42226), NOT (Martin-Carrillo et al., GCN 42227 and the Visual Telescope Project (Masi et al., GCN 42228) is clearly detected in our first images subtracted to the Pan-STARRS DR2 catalog image. We measure the following magnitude:\n\ng = 16.30 +/- 0.01 (AB), at Tmid-T0 = 2.1 hours \nr = 15.99 +/- 0.01 (AB), at Tmid-T0 = 2.0 hours\ni = 15.70 +/- 0.01 (AB), at Tmid-T0 =1.8 hours\n\nFurther observations are planned and spectroscopic observations are encouraged.\nThis project is funded by the SVOM collaboration.\n",
  "createdOn": 1760390033235,
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>",
  "eventId": "GRB 251013C"
}