{
  "bibcode": "2011GCN.11963....1M",
  "body": "A. Melandri, P. D'avanzo, D. Fugazza (INAF-OAB) and E. Palazzi (INAF-IASFBo)\non behalf of a larger collaboration report:\n\nWe observed the field of GRB 110422A (Mangano et al. GCN 11957) with the 3.6m\nTNG equipped with the Dolores camera. Few sets of unfiltered images were acquired\nstarting on Apr 22.89 UT (i.e. ~5.7 hours after the burst event).\n\nThe optical afterglow (Elunko et al. GCN 11958; Gres et al. GCN 11960;  Xu et al.\nGCN 11961, Moskvitin GCN 11962) is clearly detected in all our frames. The observed\nmagnitudes (calibrated with respect to the same star used in GCN 11961) are\n\nDt_start  t_exp    R_mag   err\n   [hr]            [s]\n---------------------------------------------\n  5.777      60.0    20.17   0.03\n  5.934      60.0    20.24   0.05\n  5.998      60.0    20.03   0.05\n  8.052      60.0    20.24   0.04\n\nOur observations, coupled with previous observations reported on GCNs imply a\npower-law decay index for the optical afterglow of ~0.55.\n\nFurther observations are ongoing.\n\nWe thank the TNG staff for their support, in particular Massimo Cecconi\nand Giovanni Mainella.\n\n[GCN OPS NOTE(23apr11): Per author's request, the last sentence was added.]",
  "circularId": 11963,
  "createdOn": 1303518349000,
  "email": "axm@astro.livjm.ac.uk",
  "subject": "GRB 110422A: TNG optical observations",
  "submitter": "Andrea Melandri at Liverpool John Moores U  <axm@astro.livjm.ac.uk>",
  "eventId": "GRB 110422A"
}