Gamma-ray Burst 020904

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN notice #1534
  K. Hurley and T. Cline, on behalf of the Ulysses, HETE, 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
  G. Ricker, J-L Atteia, N. Kawai, D. Lamb, S. Woosley, J. Doty, R. Vanderspek, J. Villasenor, G. Crew, G. Monnelly, N. Butler, J.G. Jernigan, A. Levine, F. Martel, E. Morgan, G. Prigozhin, J. Braga, R. Manchanda, G. Pizzichini, Y. Shirasaki, C. Graziani, M. Matsuoka, T. Tamagawa, K. Torii, T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi, T. Tavenner, T. Donaghy, M. Boer, J-F Olive, and J-P Dezalay, on behalf of the HETE GRB team, report:
  Ulysses, Mars Odyssey-HEND, Mars Odyssey-GRS, and HETE-FREGATE observed this GRB at 24827 seconds. As observed by Ulysses, it had a duration of approximately 15 seconds, a 25-100 keV fluence of approximately 5.1E-06 erg/cm2, and a peak flux of approximately 5.1E-07 erg/cm2 s over 0.50 seconds.
  The burst arrival direction was very close to that of the Ulysses/MO vector, resulting in one very wide annulus (~112') and two much smaller ones (~6' and 8'). The result is two alternate, preliminary, 3 sigma error boxes each with approximate areas 500 square arcminutes each whose coordinates are:

      RA(2000)                              DEC(2000)
   ERROR BOX CENTER:   0 h 44 m 28.95 s    -68 o 57 '  38.48 "
   ERROR BOX CORNER 1:  0 h 35 m 20.77 s    -69 o 33 '  50.43 "
   ERROR BOX CORNER 2:  0 h 53 m 07.86 s    -68 o 17 '  23.34 "
   ERROR BOX CORNER 3:  0 h 35 m 06.37 s    -69 o 32 '  58.52 " 
   ERROR BOX CORNER 4:  0 h 53 m 37.28 s    -68 o 18 '  22.10 "
   ERROR BOX CORNER 5:  0 h 43 m 27.01 s    -69 o 06 '  33.49 "
   ERROR BOX CORNER 6:  0 h 45 m 32.84 s    -68 o 48 '  28.17 "
  
                                         OR
  
   ERROR BOX CENTER:   1 h 41 m 58.08 s    -62 o  7 '  29.68 "
   ERROR BOX CORNER 7:  1 h 46 m 11.24 s    -61 o 14 '  55.49 "
   ERROR BOX CORNER 8:  1 h 37 m 09.77 s    -62 o 59 '  57.38 "
   ERROR BOX CORNER 9:  1 h 46 m 02.94 s    -61 o 13 '  46.22 "
   ERROR BOX CORNER 10:  1 h 37 m 21.91 s   -63 o 02 '  29.96 "
   ERROR BOX CORNER 11:  1 h 43 m 07.30 s   -62 o 00 '  49.41 " 
   ERROR BOX CORNER 12:  1 h 40 m 46.66 s   -62 o 14 '  24.57 " 
  

  There is a chance that the ambiguity can be resolved by further processing, if Konus or RHESSI observed this event; Konus data are scheduled to be downlinked around 0500 UT on Thursday September 5.
  Maps will be posted shortly at ssl.berkeley.edu/ipn3/020904. However, viewer discretion is advised; they aren't pretty.
  These error boxes may be improved.
  A GCN socket message has been issued with two larger, four-cornered error boxes, due to the format of those message.
• GCN/BACODINE POSITION NOTICE
  

  
  TITLE:             GCN/IPN POSITION NOTICE
  NOTICE_DATE:       Wed 04 Sep 02 23:11:03 UT
  NOTICE_TYPE:       IPN Double Box
  IPN_NUMBER:        373
  GRB_DATE:          12521 TJD;   247 DOY;   02/09/04
  GRB_TIME:          24827.00 SOD {06:53:47.00} UT
  GRB_IPN_RA:         11.1193d {+00h 44m 29s} (J2000),
                      11.1461d {+00h 44m 35s} (current),
                      10.6162d {+00h 42m 28s} (1950) 
  GRB_IPN_DEC:       -68.9604d {-68d 57' 36"} (J2000),
                     -68.9458d {-68d 56' 44"} (current),
                     -69.2338d {-69d 14' 01"} (1950)
  GRB_ERROR1_RA1:      8.8442d {+00h 35m 23s} (J2000)
  GRB_ERROR1_DEC1:   -69.5658d {-69d 33' 56"} (J2000)
  GRB_ERROR1_RA2:      8.4662d {+00h 33m 52s} (J2000)
  GRB_ERROR1_DEC2:   -69.4721d {-69d 28' 19"} (J2000)
  GRB_ERROR1_RA3:     13.7210d {+00h 54m 53s} (J2000)
  GRB_ERROR1_DEC3:   -68.3447d {-68d 20' 40"} (J2000)
  GRB_ERROR1_RA4:     13.2711d {+00h 53m 05s} (J2000)
  GRB_ERROR1_DEC4:   -68.2882d {-68d 17' 17"} (J2000)
  GRB_IPN2_RA:        25.5135d {+01h 42m 03s} (J2000)
  GRB_IPN2_DEC:      -62.1110d {-62d 06' 39"} (J2000)
  GRB_ERROR2_RA1:     26.5512d {+01h 46m 12s} (J2000)
  GRB_ERROR2_DEC1:   -61.2512d {-61d 15' 03"} (J2000)
  GRB_ERROR2_RA2:     26.3286d {+01h 45m 19s} (J2000)
  GRB_ERROR2_DEC2:   -61.1297d {-61d 07' 46"} (J2000)
  GRB_ERROR2_RA3:     24.4655d {+01h 37m 52s} (J2000) 
  GRB_ERROR2_DEC3:   -63.1508d {-63d 09' 02"} (J2000)
  GRB_ERROR2_RA4:     24.2858d {+01h 37m 09s} (J2000)
  GRB_ERROR2_DEC4:   -62.9952d {-62d 59' 42"} (J2000) 
  GRB_ERROR:         64.01 [arcmin radius of circumscribing circle, 3 sigma]
  GRB_BOX_AREA:      800 [sq.arcmin] 
  GRB_PEAK_FLUX:     5.1e-07 [erg/cm2/sec in 25-100 keV] in a 0.50 sec interval
  GRB_FLUENCE:       5.1e-06 [erg/cm2 in 25-100 keV] 
  GRB_DURATION:      15.0 [sec]
  SUN_POSTN:         163.01d {+10h 52m 02s}   +7.22d {+07d 13' 10"}
  SUN_DIST:          115.57 [deg]
  MOON_POSTN:        125.60d {+08h 22m 24s}  +23.33d {+23d 19' 59"}
  MOON_DIST:         120.41 [deg]
  GAL_COORDS:        303.87,-48.16 [deg] galactic lon,lat of the burst
  ECL_COORDS:        318.86,-62.11 [deg] ecliptic lon,lat of the burst
  COMMENTS:          IPN triangulation localization.
  COMMENTS:          This is a preliminary, 3 sigma error box.
  COMMENTS:          GCN message is being issued.