{
  "bibcode": "1998GCN....88....1G",
  "body": "GRB980519 Optical Observations with Keck and Palomar\n\nR. R. Gal, J. S. Bloom, C. Steidel, K. L. Adelberger, S. G. Djorgovski, \nand S. R. Kulkarni, on behalf of the Caltech GRB Collaboration, report:\n\n\"We have obtained additional photometric CCD images of the field of \nGRB 980519. C. Steidel and K. Adelberberger have obtained 11 minutes of \nR-band data using the W.M. Keck Observatory 10-m, and R. Gal has\nobtained \n800 sec. of i band data and 750 sec. of R band data with the Palomar \nObservatory 5-m on UT May 21. We measured magnitudes for the OT using\nthe \nLandolt magnitude system derived by Bloom et al.(GCN #87) for the nearby \nstars. The OT is no longer visible in our i-band data, with an upper\nlimit of \nI > 21.6 +/- 0.7, at UT May 21.43. The OT is still seen in the R band\nwith \nR = 23.48 +/- 0.2 at UT May 21.469 (Palomar) and R = 23.10 +/- 0.13 at \nUT May 21.6 (Keck). The fainter Palomar magnitude at the earlier epoch\nis \nlikely due to poor seeing conditions (>2\") which place the object close\nto \nour detection limit.\n\nC. Steidel and K. Adelberger also report that in seeing conditions\nof 0.75\" at Keck the OT is not distinguishable from a point source.\n\nWe note that these observations place an upper limit on the magnitude of\nthe \nOT host galaxy of not brighter than R ~ 24 mag.\n\nOur R-band magnitudes are consistent with the source still fading with a\nslope\nof approximately 2.0, while the I-band data do not provide additional \nconstraints on the slope.\n\nThis message may be cited.\"",
  "circularId": 88,
  "createdOn": 895875547000,
  "email": "rrg@astro.caltech.edu",
  "eventId": "GRB 980519",
  "subject": "GRB980519 optical observations",
  "submitter": "Roy Gal at CalTech  <rrg@astro.caltech.edu>"
}