{
  "bibcode": "2014GCN.16711....1A",
  "body": "F.J. Aceituno (OSN/IAA-CSIC), J. Gorosabel (IAA-CSIC/UPV-EHU) and A.J.\nCastro-Tirado (IAA-CSIC/UMA), report on behalf of a larger collaboration:\n\nWe observed the field of GRB 140818B (Vargas et al., GCN 16709) with the\n1.5m OSN telescope at Observatorio de Sierra Nevada (Spain). Several 300s\nimages were acquired in the I- and R-band starting on Aug 18, 20:15 UT\n(i.e. 1.5 hours post burst). An optical source at the edge of the\nSwift/XRT error box is detected at coordinates (J2000) RA: 18 04 32.47,\nDec: -01 23 09.8 (+/- 1\"), which is not present in the corresponding DSS-2\nimage. A preliminary photometry  against  the USNO  B1.0  catalog yields\nan I-band magnitude of 19.7 (Vega). At the moment we cannot determine if\nthe source if fading in brightness. Further observations are encouraged.",
  "circularId": 16711,
  "createdOn": 1408402224000,
  "email": "ajct@iaa.es",
  "subject": "GRB 140818B: OSN I-band afterglow candidate",
  "submitter": "Alberto Castro-Tirado at Inst.de Astro. de Andalucia  <ajct@iaa.es>",
  "eventId": "GRB 140818B"
}