Gamma-ray Burst 000812

On August 12, 2000 at 19:39:41 UT a faint, long-duration burst was detected by Ulysses, Konus-Wind, and NEAR.

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN notice #770
  K. Hurley, on behalf of the Ulysses GRB team, T. Cline, on behalf of the Konus-Wind and NEAR GRB teams, and E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team, report:
  Ulysses, Konus-Wind, and NEAR observed this burst at 70782 s. As observed by Ulysses, it had a duration ~80 s, a 25-100 keV fluence of ~2x10^-5 erg/cm^2, and a peak flux over 0.25 s of ~6.5x10^-7 erg/cm^2 s. We have triangulated it to a preliminary, 3 sigma error box whose area is ~100 sq. arcmin. and whose coordinates are:

      RA(2000)                 DEC(2000)
   18 h  8 m 43.68 s     45 o 50 '  47.28 "  (CENTER)
   18 h  8 m 28.29 s     45 o 53 '  43.56 "  (CORNER)
   18 h  8 m 37.97 s     45 o 32 '  25.73 "  (CORNER)
   18 h  8 m 50.13 s     46 o  9 '   8.88 "  (CORNER)
   18 h  8 m 59.07 s     45 o 47 '  51.20 "  (CORNER)
  

  This localization may be improved.
• GCN notice #771
  D. A. Frail (NRAO), E. Berger, A. Diercks and R. Gal (Caltech) report:
  A short VLA observation was made of the central 10 arcminutes of the IPN error box for GRB 000812 (GCN #770) on 2000 August 15.44 UT. At a wavelength of 6-cm we detected an uncatalogued source with a flux density of approximately 1 mJy. The position of this source is r.a.= 18:08:49.33 (+/-0.36s), dec.=+45:46:56.5 (+/-2.5"). We will continue to monitor this source to determine whether it is the afterglow of GRB 000812. There are no objects in the DPOSS images within the 2.5" error radius of the radio source, with typical limiting magnitudes of Bj=22.5, Rf=20.8, In=19.5.
• GCN notice #774
  N. Masetti, E. Palazzi (ITESRE, CNR, Bologna), E. Pian (OATs, Trieste), R. Cosentino, F. Ghinassi, A. Magazzu', S. Benetti, (TNG), on behalf of a larger collaboration, report:
  We acquired optical R-band images of the central part of the GRB000812 error box (Hurley et al., GCN #770) on 2000 August 16.961 UT with TNG+Dolores for a total exposure time of 30 minutes. Seeing was 1.1 arcsec. The pointing was centered on the uncatalogued radio source found by Frail et al. (GCN #771). The observations were heavily hampered by the full moon and by a 8th magnitude star located ~40 arcsec from the radio position; nevertheless, they were considerably deeper than the DSS-II.
  Photometric calibration was performed using USNO-A2.0 catalog stars. No new object brighter than the DSS-II limit is apparent all over the image. Also, no object down to a 3-sigma limiting magnitude R ~ 23 is present inside the radio source error box.