Gamma-ray Burst 020923

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN notice #1550
  K. Hurley, on behalf of the Ulysses GRB team,
  E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team,
  T. Cline, on behalf of the Ulysses, Konus, and Mars Odyssey GRB teams,
  I. Mitrofanov, D. Anfimov, A. Kozyrev, M. Litvak and A. Sanin, on behalf of the HEND/Odyssey GRB team, and W. Boynton, C. Fellows, K. Harshman, C. Shinohara and R. Starr, on behalf of the GRS/Odyssey GRB team, report:
  Konus, GRS, and HEND observed this burst at 47182 s. We have triangulated it to an annulus centered at RA, Decl (2000)=167.356, +6.634 degrees, whose radius is 57.136 +/- 0.054 degrees.
  Ulysses data are expected to arrive by 2400 UT September 24. If this event was indeed detected by Ulysses, it should be possible to derive an error box for it. More details will be given in a later message.
• GCN notice #1551
  K. Hurley and T. Cline, on behalf of the Ulysses, Konus, and Mars Odyssey GRB +teams,
  I. Mitrofanov, D. Anfimov, A. Kozyrev, M. Litvak and A. Sanin, on behalf of the HEND/Odyssey GRB team,
  W. Boynton, C. Fellows, K. Harshman, C. Shinohara and R. Starr, on behalf of the GRS/Odyssey GRB team, and
  E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team, report:
  Ulysses, Mars Odyssey-HEND and GRS, and Konus-Wind observed this GRB at 47182 seconds (GCN 1550). As observed by Ulysses, it had a duration of approximately 5 seconds, a 25-100 keV fluence of approximately 4.6E-6 erg/cm2, and a peak flux of approximately 3.5E-07 erg/cm2 s over 0.50 seconds.
  We have triangulated it to two preliminary, 3 sigma error box whose approximate areas are each 425 sq. arcmin. and whose coordinates are:

      RA(2000)                              DEC(2000)
  
   ERROR BOX CENTER:  14 h  6 m  7.54 s     50 o 31 '  18.25 "
   ERROR BOX CORNER 1: 14 h  6 m 59.90 s     50 o 17 '  59.15 "
   ERROR BOX CORNER 2: 14 h  6 m 25.92 s     50 o 51 '  50.42 " 
   ERROR BOX CORNER 3: 14 h  5 m 48.13 s     50 o 10 '  48.11 "
   ERROR BOX CORNER 4: 14 h  5 m 14.07 s     50 o 44 '  32.15 "
  
                                         OR
  
  ERROR BOX CENTER:  9 h 20 m 15.09 s      59 o 56 ' 35.43 "
  ERROR BOX CORNER 5:  9 h 18 m 33.02 s     59 o 47 '  29.22 "
  ERROR BOX CORNER 6:  9 h 20 m 57.27 s     60 o 16 '  39.32 " 
  ERROR BOX CORNER 7:  9 h 19 m 35.37 s     59 o 36 '  28.03 " 
  ERROR BOX CORNER 8:  9 h 21 m 58.62 s     60 o  5 '  30.99 "
  

  These error boxes may be improved. However, the Konus ecliptic latitude response does not allow us to choose between them; this may become possible if RHESSI observed this event.