{
  "bibcode": "1999GCN...277....1P",
  "body": "H.S. Park, L. Ott, R. Porrata (LLNL), G. Williams, D. Hartmann \n(Clemson Univ.) report on behalf of the LOTIS collaboration:\n \nLOTIS obtained realtime images of GRB990316 (BATSE Trigger 7475).\nLOTIS  started recording the first image 13.6 sec after the burst\n(on the rising edge of the GRB light curve). The first image was taken\nwith a 30 s integration time, thus this image completely overlapped the\nremainder of the GRB gamma-ray emission which lasted a total of ~40 sec.\nThe first image from one of our 4 cameras (each with 8.8 x 8.8 deg\nfield of view) covers > 98% of the BATSE 3 sigma (0.3 deg statistical +\n1.6 deg systematic) error circle. The GRB location is further\nconstrained by an annulus derived from IPN data (GCN/IPN notice) \nthat passes through the BATSE error circle in the image. \n \nWe searched for optical transients in this image by 1) comparing\nbackground images taken at later times and 2)comparing the stellar\nobjects in the image with objects in the Guide Star Catalog and Digital\nSky Survey images. We found one transient object at RA=147.54, \nDEC=-4.95 (J2000) near the edge of the IPN annulus with V~12.5 \nbrightness. This object was seen only in the first image. No object\nis seen in the DSS image at this location. The second image was \nstarted after the gamma ray emission was over (at 55 sec after the \nstart of the burst). We cannot rule out the possibility that this OT \nis a local effect rather than associated with the gamma ray burst. \nHowever, we encourage follow up observations at this location for \npossible afterglow observations.\n \nFurther analysis is in progress and associated data will be placed\non our web page.",
  "circularId": 277,
  "createdOn": 921727679000,
  "email": "hpark@llnl.gov",
  "subject": "GRB990316: simultaneous optical observation",
  "submitter": "Hye-Sook Park at LLNL  <hpark@llnl.gov>",
  "eventId": "GRB 990316"
}