{
  "body": "GRB971024                                                              #005\n\nThe KPNO reduced 4m Mosaic (8k x 8k imager) data are now available on our\nweb page ( http://www.noao.edu/noao/grb/971024.html ).  As briefly stated\nthere, these data have been block averaged (binned) 2x2 to reduce the\nimage size to 4k x 4k.  The images are about 77 Mb each.  The seeing was\npoor, about 1.5\" on the first night and about 2\" on the second night, so\nwith the ~0.25\" Mosaic pixels the images are still well sampled after\nbinning.\n\nThe images were taken in the R-band and total 50 minutes exposure each.\nZero points are not yet available.\n\nBuell Jannuzi, Arjun Dey and collaborators observed, processed, and\ncombined these images.  James Rhoads and Ted von Hippel have performed\npreliminary photometry on these images and find a large number of objects\nwhich deviate between the two epochs when comparing aperture photometry.\nMost of the objects which deviate from one epoch to the other seem to be\ndue to crowding causing aperture photometry differences due to the\ndifferent seeing, and some are due to image defects.  Careful psf-fitting\nphotometry should improve the analysis.  We are still studying these\nimages but do not want to delay the efforts of others, so we are now\nmaking the reduced images available.\n\nThis message is citable in publications.",
  "createdOn": 877824000000,
  "editedBy": "Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Tyler Barna at University of Minnesota <tylerpbarna@gmail.com>",
  "bibcode": "1997GCN.....5....1J",
  "subject": "GRB 971024: KPNO Optical  Observations Summary",
  "format": "text/plain",
  "version": 2,
  "email": "circulars@gcn.nasa.gov",
  "submitter": "Buell Jannuzi at University of Arizona <buelljannuzi@arizona.edu>",
  "circularId": 5,
  "editedOn": 1721067964619,
  "eventId": "GRB 971024"
}