{
  "bibcode": "2011GCN.12181....1L",
  "body": "Andrew J. Levan (Univ. Warwick), Stefano Covino, Andrea Melandri (INAF/ \nOABr), Daniele Malesani, Antonio de Ugarte Postigo, Johan P.U.\nFynbo (DARK/NBI), report on behalf of the X-shooter GRB GTO  \ncollaboration:\n\nWe observed the field of GRB 110719A (Sakamoto et al., GCN 12173) with  \nthe ESO VLT equipped with X-shooter. We could only take a short\nacquisition image, with mean time 2011 July 19.42 UT (3.95 hr after  \nthe GRB). No new object is detected within the refined XRT error circle\n(Goad et al., GCN 12176), down to a limiting magnitude z > 22.5 (AB),  \ncalibrated against SDSS stars in the field.\n\nWe note that the inferred limit on the broad-band spectral slope is  \nbeta_OX < 0.64 (computed between the z band and 1 keV). Given the hard\nX-ray spectral slope beta_X = 0.58 (Pagani et al., GCN 12178), our non  \ndetection is consistent with the extrapolation of the X-ray spectrum.\nOur data do not allow to classify GRB 110719A as dark.",
  "circularId": 12181,
  "createdOn": 1311101516000,
  "email": "stefano.covino@gmail.com",
  "subject": "GRB 110719A: z-band upper limit",
  "submitter": "Stefano Covino at Brera Astronomical Observatory  <stefano.covino@gmail.com>",
  "eventId": "GRB 110719A"
}