{
  "circularId": 42243,
  "submittedHow": "web",
  "format": "text/plain",
  "eventId": "GRB 251013C",
  "subject": "GRB 251013C: ALMA detection",
  "body": "T. Laskar (University of Utah), C. Christy, N. Franz, K. D. Alexander (University of Arizona), E. Berger (Harvard University), R. Chornock (UC Berkeley), H. J. van Eerten (University of Bath), G. Farley (U. Utah), W. Fong (Northwestern University), R. Gill (UNAM), J. Granot (Open University), R. Margutti (UC Berkeley), and P. Schady (University of Bath) report:\n\n“We observed GRB 251013C (Fermi GBM team, GCN 42221; Rakotondrainibe et al., GCN 42222) with the Atacama Large Millimeter/Submillimeter Array (ALMA) at 97.5 GHz beginning on 2025 October 13 at 23:07 UT (5.5 hours after the burst). \n\nPreliminary analysis reveals a mm source with flux density of ~ 0.3 mJy at position:\n\nRA (J2000) = 23:03:20.56\nDec (J2000) = -00:12:37.21\n\nwith an uncertainty of 0.02\" in each coordinate. This is consistent with the X-ray position (Rakotondrainibe et al., GCN 42222; Evans et al., GCN 42232) and optical position (Palmerio et al., GCN 42223; Masi et al., GCN 42228). Further observations are planned. \n\nWe thank the NAASC staff, P2G, AoD, JAO staff, and the entire ALMA team for their help with these observations.\"",
  "bibcode": "2025GCN.42243....1L",
  "submitter": "Tanmoy Laskar at U of Utah <tanmoylaskar@gmail.com>",
  "createdOn": 1760413909650
}