Gamma-ray Burst 000623

On June 23, 2000 at 16:36:02 UT a burst was detected by Ulysses, Konus-Wind, and NEAR.

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN notice #730
  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 59762 s UT. As observed by Ulysses, it had a duration ~5 s, a 25-100 keV fluence of ~5x10^-6 erg/cm^2, and a peak flux over 0.5 s of ~6x10^-7 erg/cm^2 s. We have localized it to an ~130 sq. arcmin. error box whose preliminary, 3 sigma coordinates are:

      RA(2000)                 DEC(2000)
   11 h 15 m 41.48 s     10 o 42 '   2.50 "  (CENTER)
   11 h 15 m 56.55 s     10 o 41 '  53.52 "  (CORNER)
   11 h 14 m 17.45 s     11 o  0 '  30.38 "  (CORNER)
   11 h 17 m  4.21 s     10 o 23 '  34.43 "  (CORNER)
   11 h 15 m 26.41 s     10 o 42 '  11.33 "  (CORNER)
  

  This localization can be improved.
• GCN notice #735
  J. Gorosabel (DSRI, Copenhagen), S. Pascual, J. Gallego, J. Zamorano (UCM, Madrid), A.J. Castro-Tirado (LAEFF-INTA, Madrid, and IAA-CSIC, Granada), J.M. Castro Ceron (ROA, San Fernando), S. Klose (Thueringer Landessternwarte, Tautenburg), J. Greiner (AIP, Potsdam), report on behalf of a larger European collaboration:
  R-band images covering 90% of the GRB 000623 error box (GCN #730) were acquired with the 2.2-m CAHA telescope, as follows:

      Date(UT)        T-T0(hr)   Exp.(s)   Seeing(")  Lim. Mag.
   ------------------------------------------------------------
    24.900 -- 24.908   29.1       120        1.2"       20
    27.860 -- 27.876  100.2       240        2.0"       20
   ------------------------------------------------------------
  

  Comparison between these two epoch observations did not reveal any object brighter than R ~ 19.7 showing a variation larger than 0.3 mag.