{
  "subject": "GRB 191001A: RATIR Optical and NIR Observations",
  "eventId": "GRB 191001A",
  "bibcode": "2019GCN.25918....1P",
  "createdOn": 1569992265000,
  "circularId": 25918,
  "submitter": "Emma Margarita Pereyra Talamantes at IA-UNAM Ensenada  <mpereyra@astro.unam.mx>",
  "email": "mpereyra@astro.unam.mx",
  "body": "Margarita Pereyra (UNAM), Alan M. Watson (UNAM), Eleonora Troja (GSFC), Nat\nButler (ASU),  Alexander Kutyrev (GSFC), William H. Lee (UNAM), Diego\nGonzalez (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier\nProchaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Owen\nLittlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jes��s Gonz��lez (UNAM),\nCarlos Rom��n-Z����iga (UNAM), Harvey Moseley (GSFC), John Capone (UMD), V.\nZach Golkhou (U. Wash.), and Vicki Toy (UMD) report:\n\nWe observed the field of the candidate afterglow of GRB 191001A (trigger\n591604915, Fermi GBM Team, GCN Circ. 25893, Pereyra et al. GCN Circ.\n25911), centered at 20:20:47.65 +15:05:03.4,  with the Reionization and\nTransients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold\nJohnson Telescope at the Observatorio Astron��mico Nacional on Sierra San\nPedro M��rtir from 2019/10 2.12 to 2019/10 2.17 UTC (20.08 to 21.45 hours\nafter the Fermi trigger), obtaining a total of 0.34 hours exposure in the g\nand r bands, 0.67 hours exposure in the i band and 0.37 hours exposure in\nthe i, Z, Y, J, and H bands.\n\nAt the position of the transient source AT2019rog discovered independently\nby ATLAS and DDOTI, in comparison with the USNO-B1, PS1 and 2MASS catalogs,\nwe obtain the following upper limits (3-sigma):\n\n  g > 23.20\n  r > 23.01\n  i > 23.26\n  Z > 21.40\n  Y > 21.49\n  J > 21.22\n  H > 20.92\n\nThese magnitudes are in the AB system and are not corrected for Galactic\nextinction in the direction of the GRB.\n\nThe non-detection implies that the source has faded by about 6 magnitudes\nin 20 hours. This is consistent with it being the afterglow of GRB 191001A.\n\nWe thank the staff of the Observatorio Astron��mico Nacional in San Pedro\nM��rtir."
}