{
  "bibcode": "2020GCN.27061....1W",
  "body": "Alan M. Watson (UNAM), Nat Butler (ASU), Margarita Pereyra (UNAM),\nWilliam H. Lee (UNAM), Simone Dichiara (GSFC/UMD), Alexander Kutyrev\n(GSFC/UMD), Margarita Pereyra (UNAM), Rosa L. Becerra (UNAM), Diego\nGonzalez (UNAM), Eleonora Troja (GSFC/UMD), and Tanner Wolfram (ASU)\nreport:\n\nWe observed LIGO/Virgo S200213t (Singer et al, GCN Circ. 27042) with the\nDDOTI/OAN wide-field imager at the Observatorio Astronomico Nacional on\nSierra San Pedro Martir (http://ddoti.astroscu.unam.mx) on the night of\n2020-02-13 UTC.\n\nWe tiled the LVC localization with three pointings centered on\n00:50:27.6 +49:57:20, 01:09:34.1 +55:40:56, and 01:46:40.1 +57:01:56\n(J2000). The combined field covers about 200 square degrees and includes\nabout 50% of the probability in the current BAYESTAR map.\n\nWe observed from 2020-02-13 04:55 UTC to 2020-02-13 07:05 UTC (from 0.75\nto 2.92 hours after the event) obtaining exposures of 24 to 44 minutes\nacross the field in the w filter. We calibrate our images against the\nAPASS catalog. Our 10-sigma limiting magnitude are between w = 18.7 and\nw = 19.2.\n\nComparing our observations to the USNO-B1 and PanSTARRS PS1 DR2\ncatalogs, with the exception of Comet C/2017 T2, we detect no\nuncatalogued sources within the observed field to our 10-sigma limit.\n\nWe thank the staff of the Observatorio Astronomico Nacional in San Pedro\nMartir.",
  "circularId": 27061,
  "createdOn": 1581637585000,
  "email": "alan@astro.unam.mx",
  "subject": "LIGO/Virgo S200213t: No Counterparts in DDOTI/OAN Optical Observations",
  "submitter": "Alan M Watson at UNAM  <alan@astro.unam.mx>",
  "eventId": "LIGO/Virgo S200213t"
}