{
  "bibcode": "2009GCN.10011....1O",
  "body": "Arto Oksanen and Eric Southgate (The Hermitage Observatory, Sunshine \nCoast, QLD, Australia) report to the AAVSO International High Energy \nNetwork the following optical observations of the field of GRB 091010 (GCN \nCirc. #10004, Donnarumma et al.):\n\nA. Oksanen and E. Southgate report an upper limit of approximately CR=17.5 \non the optical afterglow of GRB 091010 (GCN Circ. #10004, Donnarumma et \nal.).  The afterglow upper limit was measured relative to the star \nUSNO-B1.0 0674-0991959.  A single, 120-second observation was made using \nan A&M 130-mm TMB APO with an SBIG ST2000 CCD camera and no filter.  The \nmid-point of the exposure was 2009 October 10, 11:19:17 UT, approximately \n8.6 hours after the SuperAGILE trigger.  The entire error box of the burst \ncentered on RA 19h 54m 40.51s , Dec -22d 32m 17.36s was imaged; no new \nsources were detected using visual comparison of the CCD image with the \nDSS2 R-band plate of the area.\n\nA stacked, 10 x 120-second image was also created from subsequent images \nof the field using the same camera.  The midpoint of this image was 2009 \nOctober 10 11:47 UT, approximately 9.0 hours after the burst.  This image \nwas visually examined, and no candidate objects were found; the image \nextends to approximately the same depth as the DSS2 red plate.\n\nA FITS image of the initial observation is available at the following URL:\nftp://ftp.aavso.org/grb/ArtoOksanen_GRB091010_2455115.12128_.fits\n\nThe AAVSO thanks the Curry Foundation for its support of the AAVSO\nInternational High Energy Network.",
  "circularId": 10011,
  "createdOn": 1255260541000,
  "email": "matthewt@aavso.org",
  "subject": "GRB 091010 optical upper limits",
  "submitter": "AAVSO GRB Network at AAVSO  <matthewt@aavso.org>",
  "eventId": "GRB 091010"
}