////////////////////////////////////////////////////////////////////////
TITLE:   GCN CIRCULAR
NUMBER:  14868
SUBJECT: IPN Triangulation of GRB 130610B (long/multipeaked)
DATE:    13/06/11 14:51:30 GMT
FROM:    Dmitry Svinkin at Ioffe Institute  <svinkin@mail.ioffe.ru>

K. Hurley and J. Goldsten, on behalf of MESSENGER GRNS GRB team,

S. Golenetskii, R. Aptekar, V. Pal'shin, D. Frederiks,
D. Svinkin, and T. Cline on behalf of the Konus-Wind 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 long-duration GRB 130610B has been observed by Konus-Wind, INTEGRAL 
(SPI-ACS), and MESSENGER (GRNS), so far, at about 76880 s UT (21:21:20).

We have triangulated it to a preliminary, 3 sigma error box whose 
coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   176.359 (11h 45m 26s) -32.187 (-32d 11' 12")
  Corners:
   176.728 (11h 46m 55s) -31.962 (-31d 57' 43")
   176.012 (11h 44m 03s) -32.983 (-32d 58' 58")
   175.989 (11h 43m 57s) -32.409 (-32d 24' 33")
   176.709 (11h 46m 50s) -31.377 (-31d 22' 36")
  ---------------------------------------------
The error box area is 0.37 sq. deg, and its maximum dimension is
1.71 deg (the minimum one is 0.31 deg).

This box may be improved.

A triangulation map is posted at 
http://www.ioffe.ru/LEA/GRBs/GRB130610_T76879/IPN/

The time history and spectrum will be given in a forthcoming GCN Circular.

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TITLE:   GCN CIRCULAR
NUMBER:  14872
SUBJECT: Konus-Wind observation of GRB 130610B
DATE:    13/06/11 16:23:38 GMT
FROM:    Dmitry Frederiks at Ioffe Institute  <fred@mail.ioffe.ru>

S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin,
P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline, on behalf
of the Konus-Wind team, report:

The long-duration GRB 130610B
(IPN triangulation: Hurley at al., GCN 14868)
triggered Konus-Wind at T0=76879.093 s UT (21:21:19.093).

The light curve  from ~T0-0.5 s to ~T0+16s shows multiple pulses
with decaying spectral hardness.
The pulses form a quasi-periodic structure with the period of ~1s
during first ~5 seconds of the burst, which is followed, after T0+7s,
by the three pulses separated by ~2.7s.

A weak count rate excess in the soft energy channel (20-80 keV)
is observed from ~T0-170 s to ~T0-100 s in the instrument
background mode; however, its attribution to GRB 130610B
is not yet confirmed.

The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB130610_T76879/

As observed by Konus-Wind, the burst
had a fluence of (8.5 ± 0.4)x10-6 erg/cm2,
and a 64-ms peak flux, measured from T0+0.256s,
of (6.0 ± 0.5)x10-6 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).

The time-integrated spectrum (measured from T0 to T0+16.640 s)
is best fit in the 20 keV - 15 MeV range
by the cutoff power law with the following model parameters:
the photon index alpha = -1.7 ± 0.1,
the peak energy Ep = 62 ± 9 keV,
chi2 = 99/98 dof.

The 3-channel spectrum at the maximum count rate
(measured from T0+0.256 to T0+0.384 s)
can be modeled, in the 20 keV - 1.35 MeV range,
by the cutoff power law with the following model parameters:
the photon index alpha = -0.52 ± 0.08,
and the peak energy Ep = 444 ± 30 keV.

All the quoted results are preliminary.