{
  "bibcode": "2019GCN.23959....1P",
  "body": "V. Peris (OAUV-Valencia) and A. Fernandez-Soto (IFCA-Santander) report:\n\nWe have observed the field of GRB190311A (Troja et al., GCN 23946) with\nthe OAUV-0.5m telescope at the Observatorio de Aras de los Olmos (OAO)\nin Aras de los Olmos (Valencia, Spain). Observations began after local\nmidnight on March 12 (UT 01:03, (t-t0) ~ 10.7 hours ~ 0.444 days).\n\nWe took 23 ten-minute exposures using a Johnson R filter, out of which \n15 have been selected based on best quality. The afterglow reported in \nGCN23946 and confirmed by Pozanenko et al. (GCN 23947) is\nclearly detected in our combined image, with the following magnitude \nand timestamp:\n\nUT(middle)    (t-t0)  Exposure    R    Error\n----------   -------  --------  -----  -----\n  03:41:46   0.4443d  15x10min  21.45   0.15\n\nThe image has been calibrated using 100 stars in the field, the\nAPASS catalog (r and i mags) and the conversion equations in Lupton \n(2005) as given in the SDSS pages. The calibration zeropoint error is\nnot significant in comparison with the flux uncertainty (Delta(ZP)~0.03).\n\nOur results confirm the fading of the afterglow and extend the time \nbaseline from previous observations. We cannot at the present stage\nmeasure the fading rate within our observations.\n\nOAO is operated by the Observatori Astronomic de la Universitat de\nValencia (OAUV).",
  "circularId": 23959,
  "createdOn": 1552403604000,
  "email": "fsoto@ifca.unican.es",
  "subject": "GRB190311A: OAO observations",
  "submitter": "Alberto Fernandez-Soto at IFCA (CSIC/UC,Santander)  <fsoto@ifca.unican.es>",
  "eventId": "GRB 190311A"
}