{
  "bibcode": "2010GCN.10695....1R",
  "body": "V. Rumyantsev, D. Shakhovskoy (CrAO), A. Volnova (SAI MSU), A.\nPozanenko (IKI)  report on behalf of larger GRB  follow-up\ncollaboration:\n\nWe observed the field of the Swift GRB 100423A (Stroh et al., GCN\n10651) with AZT-11 telescope of CrAO Observatory between (UT) Apr. 23\n18:15 - 18:46. We do not detect source at the position of the\nafterglow (Filgas et al., GCN 10652; Ivarsen et al., GCN 10653).\n\nThe upper limit of the stacked image based on USNO-B1.0 star\n1115-0180143  (RA(J2000) = 09 05 44.73  Dec(J2000)= +21 31 14.0) and\nassuming R=17.21 is following:\n\nT0+      Filter, Exposure, mag.\n(mid, d)         (s)\n\n0.7489   R       11x180    >20.7\n\nThe upper limit is compatible with power-law decay index -1.1 reported\nby Ivarsen et al. (GCN 10653).",
  "circularId": 10695,
  "createdOn": 1272361948000,
  "email": "alinusss@gmail.com",
  "subject": "GRB 100423A: CrAO optical observations",
  "submitter": "Alina Volnova at SAI MSU  <alinusss@gmail.com>",
  "eventId": "GRB 100423A"
}