Gamma-ray Burst 030821

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:          GCN/HETE BURST POSITION NOTICE
  NOTICE_DATE:    Thu 21 Aug 03 05:31:50 UT
  NOTICE_TYPE:    HETE S/C_Alert 
  TRIGGER_NUM:    2814,   Seq_Num: 1
  GRB_DATE:       12872 TJD;   233 DOY;   03/08/21
  GRB_TIME:       19895.60 SOD {05:31:35.60} UT
  TRIGGER_SOURCE: Trigger on the 25-400 keV band.     
  GAMMA_RATE:     153  [cnts/s]  on a 1.300 [sec] timescale
  SC_-Z_RA:       330 [deg]
  SC_-Z_DEC:      -11 [deg]      
  SC_LONG:        250 [deg East] 
  SUN_POSTN:      149.96d {+09h 59m 49s}  +12.25d {+12d 14' 47"}
  MOON_POSTN:      68.94d {+04h 35m 45s}  +23.43d {+23d 25' 48"}
  MOON_ILLUM:     39 [%]
  COMMENTS:       Probable GRB.
  

• GCN/BACODINE POSITION NOTICE
  

  TITLE:          GCN/HETE BURST POSITION NOTICE
  NOTICE_DATE:    Thu 21 Aug 03 08:45:53 UT
  NOTICE_TYPE:    HETE Ground Analysis
  TRIGGER_NUM:    2814,   Seq_Num: 3
  GRB_DATE:       12872 TJD;   233 DOY;   03/08/21
  GRB_TIME:       19895.59 SOD {05:31:35.59} UT
  TRIGGER_SOURCE: Trigger on the 25-400 keV band.
  GAMMA_RATE:     153  [cnts/s]  on a 1.300 [sec] timescale
  SC_-Z_RA:       329 [deg]
  SC_-Z_DEC:      -11 [deg]
  SC_LONG:        250 [deg East]
  WXM_CNTR_RA:    326.946d {+21h 47m 47s} (J2000),
                  327.005d {+21h 48m 01s} (current),
                  326.133d {+21h 44m 32s} (1950)
  WXM_CNTR_DEC:   -48.180d {-48d 10' 49"} (J2000),
                  -48.164d {-48d 09' 48"} (current),
                  -48.413d {-48d 24' 45"} (1950)
  WXM_CORNER1:    327.3110 -48.5590 [deg]
  WXM_CORNER2:    326.8730 -48.5940 [deg]
  WXM_CORNER3:    326.5820 -47.8020 [deg]
  WXM_CORNER4:    327.0179 -47.7670 [deg]
  WXM_MAX_SIZE:   53.97 [arcmin] diameter
  WXM_LOC_SN:     7 sig/noise (pt src in image)
  WXM_IMAGE_SN:   X= 3.7 Y= 2.2 [sig/noise]
  WXM_LC_SN:      X= 11.1 Y= 1.1 [sig/noise]
  SUN_POSTN:      149.96d {+09h 59m 49s}  +12.25d {+12d 14' 47"}
  SUN_DIST:       144.00 [deg]
  MOON_POSTN:      68.94d {+04h 35m 45s}  +23.43d {+23d 25' 48"}
  MOON_DIST:      115.01 [deg]
  MOON_ILLUM:     39 [%]
  GAL_COORDS:     349.61,-48.82 [deg] galactic lon,lat of the burst
  ECL_COORDS:     311.57,-32.62 [deg] ecliptic lon,lat of the burst
  COMMENTS:       Definite GRB.
  COMMENTS:       Burst_Validity flag is true.
  COMMENTS:       WXM data refined since S/C_Last Notice.
   

• GCN/BACODINE POSITION NOTICE
  

  TITLE:          GCN/HETE BURST POSITION NOTICE
  NOTICE_DATE:    Thu 21 Aug 03 22:12:10 UT
  NOTICE_TYPE:    HETE Ground Analysis
  TRIGGER_NUM:    2814,   Seq_Num: 4
  GRB_DATE:       12872 TJD;   233 DOY;   03/08/21
  GRB_TIME:       19895.59 SOD {05:31:35.59} UT
  TRIGGER_SOURCE: Trigger on the 25-400 keV band.
  GAMMA_RATE:     153  [cnts/s]  on a 1.300 [sec] timescale
  SC_-Z_RA:       328 [deg]
  SC_-Z_DEC:      -11 [deg]      
  SC_LONG:        250 [deg East] 
  WXM_CNTR_RA:    325.637d {+21h 42m 33s} (J2000),
                  325.696d {+21h 42m 47s} (current),
                  324.836d {+21h 39m 21s} (1950)
  WXM_CNTR_DEC:   -45.203d {-45d 12' 12"} (J2000),
                  -45.187d {-45d 11' 11"} (current),
                  -45.432d {-45d 25' 55"} (1950)
  WXM_CORNER1:    325.4500 -43.5840 [deg]
  WXM_CORNER2:    326.4920 -46.7710 [deg]
  WXM_CORNER3:    325.8180 -46.8230 [deg]
  WXM_CORNER4:    324.7900 -43.6360 [deg] 
  WXM_MAX_SIZE:   201.33 [arcmin] diameter 
  WXM_LOC_SN:     7 sig/noise (pt src in image)
  WXM_IMAGE_SN:   X= 3.7 Y= 2.2 [sig/noise]
  WXM_LC_SN:      X= 11.1 Y= 1.1 [sig/noise]
  SUN_POSTN:      149.96d {+09h 59m 49s}  +12.25d {+12d 14' 47"}
  SUN_DIST:       146.86 [deg]
  MOON_POSTN:      68.94d {+04h 35m 45s}  +23.43d {+23d 25' 48"}
  MOON_DIST:      115.48 [deg]
  MOON_ILLUM:     39 [%]         
  GAL_COORDS:     354.30,-48.54 [deg] galactic lon,lat of the burst
  ECL_COORDS:     311.95,-29.53 [deg] ecliptic lon,lat of the burst
  COMMENTS:       Definite GRB.
  COMMENTS:       Burst_Validity flag is true.  
  COMMENTS:       WXM data refined since S/C_Last Notice.
  

• GCN notice #2358
  T. Donaghy, C. Graziani, Y. Shirasaki, T. Tamagawa, M. Suzuki, M. Matsuoka, K. Torii, T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi, Y. Nakagawa, R. Satoh, Y. Urata, T. Yamazaki and Y. Yamamoto, on behalf of the HETE WXM Team;
  G. Ricker, J-L. Atteia, N. Kawai, D. Lamb, and S. Woosley on behalf of the HETE Science Team;
  G. Prigozhin, N. Butler, G. Crew, J. Doty, A. Dullighan, R. Vanderspek, J. Villasenor, J. G. Jernigan, A. Levine, F. Martel, E. Morgan, G. Monnelly, G. Azzibrouck, J. Braga, R. Manchanda, and G. Pizzichini, on behalf of the HETE Operations and HETE Optical-SXC Teams;
  C. Barraud, M. Boer, J-F Olive, and J-P Dezalay on behalf of the HETE FREGATE Team;
  K. Hurley and T. Cline, on behalf of the Ulysses, HETE, Mars Odyssey, and KONUS GRB teams;
  I. Mitrofanov, S. Charyshnikov, V. Grinkov, 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;
  E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team;
  A. von Kienlin, G. Lichti, and A. Rau, on behalf of the INTEGRAL SPI-ACS GRB team,
  report:
  At 05:31:50 UTC (19895.60 s UT) on 21 August 2003, the HETE FREGATE and WXM instruments detected GRB 030821 (=H2814), a faint long GRB.
  The burst triggered FREGATE in the 25-400 keV energy band. A GCN burst alert was issued 15 s later. The burst was faint and located at the edge of the FOV of the WXM YB counter; hence no WXM flight localization was derived. Ground analysis of the WXM data provided a localization that was reported in a GCN Notice (Seq. 3) at 08:45:53 UT.
  Mars Odyssey (HEND), Konus-Wind, and INTEGRAL (SPI-ACS) also observed this burst. Triangulation of the burst produces a preliminary annulus centered at
  RA = 341.285, Dec = -15.283 (J2000),
  whose radius is 32.642 +/- 1.153 degrees (3 sigma). This annulus does not include the initial (Seq. 3) HETE-2 WXM ground analysis location, but is fully consistent with the revised ground analysis location that was reported in a GCN Notice (Seq. 4) at 22:12:10 UT. The revised WXM ground analysis localization can be expressed as a rectangle that is 33 arcminutes wide and 3.3 degrees long, whose center is at
  WXM Center-ground: RA = +21h 42m 33s, Dec = -45d 12' 12" (J2000).
  The four corners of the WXM localization region are located at the following coordinates (J2000):

  WXM_CORNER1:    RA = +21h 41m 48s, Dec = -43d 35'  2"
  WXM_CORNER2:    RA = +21h 45m 58s, Dec = -46d 46' 16"
  WXM_CORNER3:    RA = +21h 43m 16s, Dec = -46d 49' 23"
  WXM_CORNER4:    RA = +21h 39m 10s, Dec = -43d 38' 10"
  

  The burst was very faint in the SXC X-camera and was outside the FOV of the SXC Y-camera; hence an SXC localization is unlikely.
  The T_90 duration of the burst in the 30-400 keV band was ~ 19 s. The peak photon energy flux in 1 s and the fluence of the burst were 4.8 x 10-7 ergs cm-2 s-1 and 5.7 x 10-6 ergs cm-2, respectively, in the same energy band.
  Ulysses data are expected shortly, and may constrain the localization further.
  A light curve and finding chart for GRB030821 are provided at the following URL:
  http://space.mit.edu/HETE/Bursts/GRB030821
• GCN notice #2359
  K. Hurley and T. Cline, on behalf of the Ulysses, Konus, Odyssey, and HETE GRB teams,
  E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team,
  I. Mitrofanov, S. Charyshnikov, V. Grinkov, 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,
  A. von Kienlin, G. Lichti, and A. Rau, on behalf of the INTEGRAL SPI-ACS 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 data have now been received for this burst (GCN 2358). Because Ulysses is approximately 16 times farther from Earth than Mars, the width of the triangulation annulus is substantially smaller. We have triangulated the position to a preliminary annulus centered at RA, Decl(2000)= 340.962, -23.121 degrees, with radius 25.143 +/- 0.332 degrees (3 sigma). This annulus intersects the HETE WXM error box given in GCN 2358 to form an error box which is about 5 times smaller, with an area ~1200 square arcminutes. The corners of this error box are:

  RA(2000)    Decl(2000)
  326.077     -45.547
  325.767     -44.594
  325.266     -45.157
  324.954     -44.170
  

  A figure has been posted at ssl.berkeley.edu/ipn3/030821. Only very slight improvements to this error box are expected.