{
  "bibcode": "2016GCN.19928....1D",
  "body": "A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), Z. Cano (IAA-CSIC) & F. Aceituno\n(IAA-CSIC) report on behalf of a larger collaboration:\n\nWe observed the field of GRB 160917A (Racusin et al.; GCN Circ. 19926) with\nthe 1.5-m OSN telescope in Granada, Spain.  We began observing at 19:08:34\nUT (7.64 hours after the GRB onset), and obtained 14x300s images in\nI-band.  In our coadded image, we find no new source in the refined XRT\nerror circle (Evans et al; GCN Circ. 19927) down to a a 3-sigma limit of\nI(Vega) = 22.6.  The calibration was performed using a nearby star in the\nUSNO B1 catalog, and the upper limit corresponds to an isolated point\nsource in our co-added image.",
  "circularId": 19928,
  "createdOn": 1474145358000,
  "email": "zewcano@gmail.com",
  "subject": "GRB 160917A: OSN I-band upper limits",
  "submitter": "Zach Cano at U of Iceland  <zewcano@gmail.com>",
  "eventId": "GRB 160917A"
}