Gamma-ray Burst 050922

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN notice #4007
  D.Gotz, S.Mereghetti (IASF, Milano) S. Shaw, N. Mowlavi, M. Beck, J. Zurita Heras (ISDC, Versoix) and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report:
  A possible GRB triggered IBAS at 13:43:18 UT with coordinates (J2000)

  R.A. = 271.1541
  Dec. = -32.0235
    

  with an uncertainty of 3.5 arcmin radius (90% c.l.).
  The trigger significance was below the threshold for automatic alert delivery.
  A preliminary analysis shows a spectrum consistent with an X-ray flash and a fluence (20-200 keV) is 1E-7 erg/cm^2. However, due to the position in the galactic bulge and the soft spectrum, we cannot exclude that the trigger is due to an uncatalogued Galactic source.
  This message can be cited.
• GCN/BACODINE POSITION NOTICE
  

  TITLE:          GCN/INTEGRAL NOTICE
  NOTICE_DATE:    Thu 22 Sep 05 16:06:59 UT
  NOTICE_TYPE:    INTEGRAL Offline
  TRIGGER_NUM:    2650,   Sub_Num: 0
  GRB_RA:         271.1540d {+18h 04m 37s} (J2000),
                  271.2473d {+18h 04m 59s} (current),
                  270.3394d {+18h 01m 21s} (1950)
  GRB_DEC:        -32.0234d {-32d 01' 23"} (J2000),
                  -32.0227d {-32d 01' 21"} (current),
                  -32.0270d {-32d 01' 36"} (1950)
  GRB_ERROR:      3.48 [arcmin, radius, statistical only]
  GRB_INTEN:      7.11 [sigma]
  GRB_TIME:       49415.38 SOD {13:43:35.38} UT
  GRB_DATE:       13635 TJD;   265 DOY;   05/09/22
  SC_RA:          269.38 [deg] (J2000)
  SC_DEC:         -28.25 [deg] (J2000)
  SUN_POSTN:      179.68d {+11h 58m 43s}   +0.14d {+00d 08' 20"}
  SUN_DIST:        91.40 [deg]
  MOON_POSTN:      55.04d {+03h 40m 08s}  +23.33d {+23d 19' 59"}
  MOON_DIST:      146.94 [deg]
  GAL_COORDS:     359.39, -5.09 [deg] galactic lon,lat of the burst
  ECL_COORDS:     270.99, -8.59 [deg] ecliptic lon,lat of the burst
  COMMENTS:       INTEGRAL GRB Coordinates.
  COMMENTS:       Possible GRB 050922
  

• GCN notice #4014
  J. A. Kennea, D. N. Burrows (PSU) and N. Gehrels (GSFC) report on behalf of the Swift/XRT Team:
  Swift began a target of opportunity observation of the INTEGRAL discovered burst GRB 050922A (GCN 4007) at 15:21:21 UT on September 22nd, 2005. Analysis of ground processed XRT data reveals no point source inside the INTEGRAL error circle. We estimate a 90% confidence level upper limit on the X-ray flux from this burst of 3 x 10^-14 erg/s (0.5 - 10 keV).