Gamma-ray Burst 021125

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN notice #1706
  A. Bazzano, A. Paizis and the INTEGRAL Science Team report the detection of GRB021125 at 17:58:30 UTC of duration 20 sec in IBIS field of view with ISGRI and PICsIT detectors.
  The event is confirmed by the SPI anticoincidence system. The most probable preliminary position is RA 19h 47m and DEC +28.1deg.
  The position uncertainty is entirely systematics and estimated to be 30 arcmin at this early stage of INTEGRAL commissioning.
  A refined position will be published as soon as possible.
  The burst peak intensity was about 2-4 Crab in the energy range 15-120 keV.
  This message is citable.
• GCN notice #1707
  K. Hurley and T. Cline, on behalf of the Ulysses 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
  D. M. Smith, R. P. Lin, J. McTiernan, R. Schwartz, C. Wigger, W. Hajdas, and A. Zehnder, on behalf of the RHESSI GRB team, report:
  Ulysses, Mars Odyssey-HEND, and RHESSI observed this GRB (GCN1706) at 64710 seconds. As observed by Ulysses, it had a duration of approximately 30 seconds, a 25-100 keV fluence of approximately 8.7E-06 erg/cm2, and a peak flux of approximately 7.8E-07 erg/cm2 s over 0.50 seconds.
  We have triangulated it to a preliminary, 3 sigma error box whose approximate area is 111. sq. arcmin. and whose coordinates are:

      RA(2000)                              DEC(2000)
   
   ERROR BOX CENTER:   19 h 47 m 42.76 s     28 o 17 '   8.06 " 
   ERROR BOX CORNER 1: 19 h 46 m 49.27 s     28 o  9 '  14.20 " 
   ERROR BOX CORNER 2: 19 h 47 m 47.73 s     28 o 13 '   9.68 " 
   ERROR BOX CORNER 3: 19 h 47 m 37.78 s     28 o 21 '   6.43 " 
   ERROR BOX CORNER 4: 19 h 48 m 36.40 s     28 o 25 '   0.85 " 

  Assuming that the INTEGRAL-IBIS localization is a circle with 30 arcminute radius, this error box lies entirely within it and reduces its area by a factor of about 25.
  An image will be posted shortly at http://ssl.berkeley.edu/ipn3/021125.
  This error box may be improved.
• GCN notice #1708
  

   TITLE: IPN BURST POSITION MESSAGE # 430
   NOTICE TYPE: SINGLE ERROR BOX
   APPROXIMATE EARTH-CROSSING TIME (DD MM YYYY UT): 25 11 2002 17:58:30
   APPROXIMATE 25-100 keV FLUENCE (ERG/CM^2):  8.7E-06
   APPROXIMATE 25-100 keV PEAK FLUX (ERG/CM^2/SEC): 7.8E-07 IN A 0.50 SEC INTERVAL
   APPROXIMATE T90 DURATION (S):  3.00E+01
   ERROR BOX CENTER:   19 h 47 m 42.76 s     28 o 17 '   8.06 " 
   ERROR BOX CORNER 1: 19 h 46 m 49.27 s     28 o  9 '  14.20 " 
   ERROR BOX CORNER 2: 19 h 47 m 47.73 s     28 o 13 '   9.68 " 
   ERROR BOX CORNER 3: 19 h 47 m 37.78 s     28 o 21 '   6.43 " 
   ERROR BOX CORNER 4: 19 h 48 m 36.40 s     28 o 25 '   0.85 " 
  
   APPROXIMATE ERROR BOX AREA (SQ. ARCMIN.):  1.11E+02
   COMMENTS: This is a preliminary, 3 sigma error box.
   COMMENTS: GCN message is being issued.
  

• GCN notice #1709
  K. Hurley, on behalf of the Ulysses and Mars Odyssey GRB teams,
  E. Mazets and S. Golenetskii, on behalf of the Konus-Wind 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,
  I. Mitrofanov, D. Anfimov, A. Kozyrev, M. Litvak and A. Sanin, on behalf of the HEND/Odyssey GRB team,
  T. Cline, on behalf of the Ulysses, Odyssey, and Konus GRB teams, and
  W. Boynton, C. Fellows, K. Harshman, C. Shinohara and R. Starr, on behalf of the GRS/Odyssey GRB team, report:
  This burst (GCN 1706, 1707) was also observed by Konus. We have triangulated it to an improved, but still preliminary 3 sigma error box whose approximate area is 72 sq. arcmin. and whose coordinates are:

      RA(2000)                              DEC(2000) 
  
  ERROR BOX CENTER:   19 h 47 m 25.93 s     28 o 16 '   0.45 " 
  ERROR BOX CORNER 1: 19 h 46 m 45.23 s     28 o  8 '  57.88 " 
  ERROR BOX CORNER 2: 19 h 47 m 33.79 s     28 o 20 '  50.43 " 
  ERROR BOX CORNER 3: 19 h 47 m 18.08 s     28 o 11 '  10.45 " 
  ERROR BOX CORNER 4: 19 h 48 m 06.73 s     28 o 23 '  02.41 "

  This error box is fully contained within the INTEGRAL error circle and overlaps the previous IPN error box (GCN 1707), but about 10 square arcminutes in this new box are not included in the old one. A map showing the two new triangulation annuli, the INTEGRAL error circle, and the old error box, is being posted to ssl.berkeley.edu/ipn3/021125.
  This error box may be improved.
• GCN notice #1714
  A. Gros (CEA-Saclay) and N. Produit (ISDC) on behalf of the INTEGRAL Science Working Team report:
  The systematic errors on the position of GRB021125 obtained from the IBIS/ISGRI data have been significantly reduced to a radius of 2 arcmin. The resulting new position of the 2 arcmin-radius circle center is 19h 47m 56s, 28o 23' 28" (2000). This circle is fully contained in the previous INTEGRAL error circle (GCN 1706) and partially overlaps the most recent IPN error box (GCN 1709).
  This message can be cited
• GCN notice #1729
  E. Berger (Caltech) and D. A. Frail (NRAO) report on behalf of a larger collaboration:
  "On December 8.03 UT we used the VLA at 8.46 GHz to observe the 2-arcmin refined error circle of GRB 021125 (GCN 1714) localized by INTEGRAL (GCN 1706). We do not detect any sources within the error circle down to a 5-sigma limit of 220 microJy. No further observations are planned"
  This message may be cited.