Gamma-ray Burst 141029B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN Circular #16987
  O.J. Roberts (UCD) reports on behalf of the Fermi GBM Team:
  "At 03:13:18.62 UT on the 29th October 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 141029B (trigger 436245201 / 141029134). The trigger resulted in an Autonomous Repoint Request (ARR) that was accepted and the spacecraft slewed to the GBM in-flight location.
  The on-ground calculated location, using the GBM trigger data, is RA = 105.2, DEC = +25.1, with an uncertainty of 1.0 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees).
  The angle from the Fermi LAT boresight is about 42 degrees.
  The GBM light curve consists of a multiple episodes with a duration (T90) of about 202.4 s (50-300 keV). The time-averaged spectrum from T0-12.2 s to T0+190.5 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -1.36 +/- 0.03 and the cutoff energy, parameterised as Epeak, is 191 +/-13 keV.
  The event fluence (10-1000 keV) in this time interval is (3.800 +/- 0.10)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+78.3 s in the 10-1000 keV band is 20.3 +/- 0.4 ph/s/cm^2.
  The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
• GCN Circular #16988
  K. Hurley, on behalf of the IPN,
  J. Goldsten, on behalf of the MESSENGER NS GRB team,
  A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, and
  V. Connaughton, M. S. Briggs, C. Meegan, and V. Pelassa, on behalf of the Fermi GBM team, report:
  GRB 141029B (Roberts et al. GCN 16987) was also observed by INTEGRAL (SPI-ACS) and MESSENGER, so far. We have triangulated it to a preliminary, 3 sigma annulus, whose coordinates are RA (center), Dec (center), radius= 16.850, +5.225, 87.104 +/- 0.259 degrees. This annulus intersects the GBM 1 sigma (statistical-only) error circle at two points:

  	RA(deg)	 Dec(deg)
        105.735    +24.226
        105.874    +25.894
  

  to form an error box whose area is approximately 0.56 sq. deg. This triangulation may be improved.
  A map has been posted at ssl.berkeley.edu/ipn3/141029B