{
  "bibcode": "2009GCN..9536....1F",
  "body": "A. Fernandez-Soto (IFCA-Santander), V. Peris (OAUV-Valencia), and\nJ. Alonso-Lorite (OAUV-Valencia) report:\n\nWe have observed the field of GRB090618 (Schady et al., GCN 9512) with\nthe OAUV-0.4m telescope at the Observatorio Astronomico de Aras (OAA)\nin Aras de Alpuente (Valencia, Spain). Observations began after local\nsunset on June 18 (UT 19:32, (t-t0)~11.1 hours).\n\nWe took 23 four-minute exposures using a Johnson R filter. The\nindividual frames have been combined in five groups. The afterglow\nreported in GCN9512 and confirmed by Cenko et al. (GCN 9513) is\nclearly detected in all five images, with magnitudes and times:\n\nUT(middle)   Exposure    R    Error\n----------   --------  -----  -----\n  21:30:03     5x4min   18.67   0.14\n  21:50:51     5x4min   18.57   0.09\n  22:42:14     4x4min   18.62   0.09\n  23:21:44     5x4min   18.92   0.13\n  23:45:19     2x4min   18.96   0.13\n\nAll magnitudes have been calibrated using stars in the field and the\nUSNO-B1 catalog (R1 mags).\n\nOur results agree with those reported by Cano et al. (GCN 9531), and\nsupport the presence of a break in the R-band decay, which happened at\n(t-t0) ~ 14.6 hours.\n\nA lightcurve combining our data and previous GCNs is posted at\nhttp://ayalga.uv.es/~fsoto/grb090618\n\nOAA is operated by the Observatori Astronomic de la Universitat de\nValencia (OAUV).",
  "circularId": 9536,
  "createdOn": 1245452706000,
  "email": "fsoto@ifca.unican.es",
  "subject": "GRB090618: OAA-OAUV Optical observations",
  "submitter": "Alberto Fernandez-Soto at IFCA (CSIC/UC,Santander)  <fsoto@ifca.unican.es>",
  "eventId": "GRB 090618"
}