Gamma-ray Burst 140604A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN Circular #16350
  S. Golenetskii, R. Aptekar, V. Pal'shin, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team,
  K. Hurley and J. Goldsten, on behalf of the MESSENGER NS GRB team,
  G. Di Cocco, F. Fuschino, M. Galli, C. Labanti, and M. Marisaldi, on behalf of the AGILE MCAL team, and
  A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, report:
  The short-duration, hard spectrum, bright GRB 140604A has been observed by Konus-Wind, AGILE (MCAL), MESSENGER (GRNS), and INTEGRAL (SPI-ACS), so far, at about 17411 s UT (04:50:11).
  We have triangulated it to a preliminary, 3 sigma error box whose coordinates are:

  ---------------------------------------------
      RA(2000), deg                 Dec(2000), deg
     ---------------------------------------------
     Center:
      263.170 (17h 32m 41s) -40.406 (-40d 24' 22")
     Corners:
      262.578 (17h 30m 19s) -40.773 (-40d 46' 24")
      263.162 (17h 32m 39s) -41.034 (-41d 02' 02")
      263.750 (17h 35m 00s) -40.031 (-40d 01' 53")
      263.172 (17h 32m 41s) -39.770 (-39d 46' 12")
     ---------------------------------------------
  

  The error box area is 2020 sq. arcmin, and its maximum dimension is 76 arcmin (the minimum one is 31 arcmin).
  This box may be improved.
  A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB140604_T17415/IPN/
  The time history and spectrum will be given in a forthcoming GCN Circular.
• GCN Circular #16351
  S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, and T. Cline on behalf of the Konus-Wind team, report:
  The short-duration, hard spectrum, bright GRB 140604A (Golenetskii et al., GCN ) triggered Konus-Wind at T0=17415.447 s UT (04:50:15.447). The burst light curve shows several peaks with a total duration of ~1s. The emission is seen up to ~3 MeV.
  As observed by Konus-Wind, the burst had a fluence of 7.2(-1.8,+2.4)x10^-6 erg/cm2, and a 16-ms peak flux, measured from T0+0.592 s, of 2.55(-0.65,+0.89)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
  The time-integrated spectrum of the burst (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 4 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.54(-0.32,+0.43), and Ep = 795(-236,+414) keV (chi2 = 62/68 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -1.7 (chi2 = 62/67 dof).
  The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB140604_T17415/
  All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.