Gamma-ray Burst 040425

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:          GCN/HETE BURST POSITION NOTICE
  NOTICE_DATE:    Sun 25 Apr 04 16:25:21 UT 
  NOTICE_TYPE:    HETE S/C_Alert 
  TRIGGER_NUM:    3183,   Seq_Num: 1
  GRB_DATE:       13120 TJD;   116 DOY;   04/04/25
  GRB_TIME:       59110.29 SOD {16:25:10.29} UT
  TRIGGER_SOURCE: Trigger on the 25-400 keV band.
  GAMMA_RATE:     119  [cnts/s]  on a 5.200 [sec] timescale
  SC_-Z_RA:       196 [deg]
  SC_-Z_DEC:      -15 [deg]      
  SC_LONG:         42 [deg East] 
  SUN_POSTN:       33.49d {+02h 13m 57s}  +13.45d {+13d 27' 12"}
  MOON_POSTN:     104.62d {+06h 58m 29s}  +27.50d {+27d 29' 56"}
  MOON_ILLUM:     31 [%]         
  COMMENTS:       Probable GRB.
  

• GCN/BACODINE POSITION NOTICE
  

   
  TITLE:          GCN/HETE BURST POSITION NOTICE
  NOTICE_DATE:    Sun 25 Apr 04 16:28:42 UT
  NOTICE_TYPE:    HETE S/C_Last
  TRIGGER_NUM:    3183,   Seq_Num: 2
  GRB_DATE:       13120 TJD;   116 DOY;   04/04/25
  GRB_TIME:       59110.29 SOD {16:25:10.29} UT
  TRIGGER_SOURCE: Trigger on the 25-400 keV band.
  GAMMA_RATE:     119  [cnts/s]  on a 5.200 [sec] timescale
  SC_-Z_RA:       196 [deg]
  SC_-Z_DEC:      -15 [deg]
  SC_LONG:         42 [deg East]
  SUN_POSTN:       33.49d {+02h 13m 57s}  +13.45d {+13d 27' 12"}
  MOON_POSTN:     104.62d {+06h 58m 29s}  +27.50d {+27d 29' 56"}
  MOON_ILLUM:     31 [%]
  COMMENTS:       Probable GRB.
  COMMENTS:       There is no position known for this trigger at this time.
  

• GCN/BACODINE POSITION NOTICE
  

  TITLE:          GCN/HETE BURST POSITION NOTICE
  NOTICE_DATE:    Sun 25 Apr 04 20:04:48 UT 
  NOTICE_TYPE:    HETE Ground Analysis
  TRIGGER_NUM:    3183,   Seq_Num: 3
  GRB_DATE:       13120 TJD;   116 DOY;   04/04/25
  GRB_TIME:       59110.29 SOD {16:25:10.29} UT
  TRIGGER_SOURCE: Trigger on the 25-400 keV band.
  GAMMA_RATE:     119  [cnts/s]  on a 5.200 [sec] timescale
  SC_-Z_RA:       195 [deg]
  SC_-Z_DEC:      -15 [deg]
  SC_LONG:         42 [deg East] 
  WXM_CNTR_RA:    232.899d {+15h 31m 36s} (J2000),
                  232.971d {+15h 31m 53s} (current),
                  232.076d {+15h 28m 18s} (1950)
  WXM_CNTR_DEC:   -39.721d {-39d 43' 13"} (J2000),
                  -39.735d {-39d 44' 05"} (current),
                  -39.551d {-39d 33' 02"} (1950)
  WXM_CORNER1:    233.4280 -43.1730 [deg]
  WXM_CORNER2:    233.9770 -42.9630 [deg]
  WXM_CORNER3:    232.3670 -36.2800 [deg]
  WXM_CORNER4:    231.8260 -36.4660 [deg] 
  WXM_MAX_SIZE:   416.20 [arcmin] diameter  
  WXM_LOC_SN:     8 sig/noise (pt src in image)
  WXM_IMAGE_SN:   X= 4.0 Y= 1.0 [sig/noise]
  WXM_LC_SN:      X= 8.3 Y= 1.4 [sig/noise]
  SUN_POSTN:       33.49d {+02h 13m 57s}  +13.45d {+13d 27' 12"}
  SUN_DIST:       148.63 [deg]
  MOON_POSTN:     104.62d {+06h 58m 29s}  +27.50d {+27d 29' 56"}
  MOON_DIST:      135.92 [deg]
  MOON_ILLUM:     31 [%]
  GAL_COORDS:     333.52,13.46 [deg] galactic lon,lat of the burst
  ECL_COORDS:     240.41,-20.02 [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 #2583
  

  TITLE:   GCN GRB OBSERVATION REPORT
  NUMBER:  2583
  SUBJECT: IPN triangulation of GRB040425 (=H3183)
  DATE:    04/04/27 00:47:17 GMT
  FROM:    Kevin Hurley at UCBerkeley/SSL  
  

  K. Hurley and T. Cline, on behalf of the Ulysses, HETE, Mars Odyssey, and Konus GRB teams,
  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,
  G. Ricker, J-L Atteia, N. Kawai, D. Lamb, S. Woosley, J. Doty, R. Vanderspek, J. Villasenor, G. Crew, A. Dullighan, 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,
  D. M. Smith, R. P. Lin, J. McTiernan, R. Schwartz, C. Wigger, W. Hajdas, and A. Zehnder, on behalf of the RHESSI GRB team,
  A. von Kienlin, G. Lichti, and A. Rau, on behalf of the INTEGRAL SPI-ACS GRB team, and
  I. Mitrofanov, S. Charyshnikov, V. Grinkov, A. Kozyrev, M. Litvak, and A. Sanin, on behalf of the HEND-Odyssey GRB team, report:
  Mars Odyssey (GRS), Konus-Wind, INTEGRAL (SPI-ACS), and RHESSI observed this HETE event, whose error box was given in a GCN Notice on 25 April, 20:04:48, Sequence Number 3. Triangulation gives an annulus centered at RA, Decl (2000)= 261.762, -24.435, whose radius is 28.899 +/- 0.020 degrees (3 sigma). This annulus interesects the HETE WXM error box at:

  RA(2000)	Decl(2000)
  233.588        -41.467
  233.553        -41.330
  232.605        -39.894
  232.564        -39.722
  

  The area of the combined HETE WXM/IPN error box is ~250 sq. arcmin. Only minor improvements to this error box are expected.
  A map has been posted at ssl.berkeley.edu/ipn3/040425.