{
  "bibcode": "1999GCN...377....1P",
  "body": "Infrared and Optical Observations of GRB990705\n\nE. Palazzi, N. Masetti, E. Pian, F. Frontera, L. Amati (ITESRE-CNR,\nBologna), M. Mendez, P. Vreeswijk, E. Rol, T. Galama, F. van der Hooft,\nM.  van der Klis, M. Heemskerk, (Univ. of Amsterdam), J. van Paradijs\n(U. of Amsterdam and U. of Alabama in Huntsville), L.  Hunt (Astr. Obs.\nof Arcetri), L.A. Antonelli, G. Marconi (Astr. Obs. of Rome), E.\nKuulkers (SRON, Utrecht), T. Augusteijn, H. Boehnhardt, C. Lidman, L.\nVanzi (ESO), M. Feroci (IAS-CNR, Rome), and C.  Kouveliotou (MSFC/NASA)\nreport on behalf of a large collaboration:\n\n\n\"We have observed the error box of GRB990705 (BeppoSAX mail # 99/16 and\n99/17) at the ESO NTT with SOFI in H filter for 20 minutes starting on \nJuly 5.94 UT and for 10 minutes starting on July 6.95 UT. An object of \nH = 16.7 +- 0.1 is detected in the first night at RA = 05 09 55.4, Dec\n= -72 08 01 (astrometric uncertainty of 1\".5), and not in the second  \nnight, with a 3-sigma upper limit of H >~ 19.  The position of the  \ntransient is consistent with that of the X-ray transient detected with\nthe SAX NFIs (Gandolfi, GCN 373).  We propose that the transient source\nis the infrared counterpart to GRB 990705.  Assuming a power-law\ntemporal fading, the measured magnitude and upper limit would imply\nthat the decay index is < -1.4.\n\nIn a 10-minutes exposure taken at the VLT with FORS1 in the V filter on\nJuly 6.40 UT in very bad seeing conditions (~2\".5) the source is\ndetected at 3-sigma confidence level with V ~22.5, linked to the\nstandard sequence PG 2331+055 (Landolt 1992, AJ 104, 340).\n\nA 7.5-min exposure with the ESO 2.2m telescope at La Silla on July 6.44\nUT yields no detection, to a 3-sigma limiting magnitude of B ~22,\nlinked to the USNO-A1.0 star at RA = 05 09 42.59, Dec = -72 07 41.2\n(J2000) which has B = 19.1.\"\n\nThis message can be cited.",
  "circularId": 377,
  "createdOn": 931364915000,
  "email": "pian@tesre.bo.cnr.it",
  "subject": "Infrared and Optical Observations of GRB990705",
  "submitter": "Elena Pian at ITESRE-CNR,Bologna  <pian@tesre.bo.cnr.it>",
  "eventId": "GRB 990705"
}