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GCN Circular 13487

Subject
IPN Triangulation of unusual GRB 120716A
Date
2012-07-17T20:16:23Z (12 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
K. Hurley, and J. Goldsten, on behalf of the MESSENGER GRNS GRB team,

S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks,
D. Svinkin, and T. Cline on behalf of the Konus-Wind team,

V. Connaughton, M. Briggs, and C. Meegan, on behalf of the Fermi
GBM 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

K. Yamaoka, M. Ohno, Y. Hanabata, Y. Fukazawa, T. Takahashi, M. Tashiro,
Y. Terada, T. Murakami, and K. Makishima on behalf of the Suzaku WAM
team, report:

The long-duration GRB 120716A has been observed by Fermi (GBM: trigger
364151106), Konus-Wind, INTEGRAL (SPI-ACS), Suzaku (WAM), and MESSENGER
(GRNS), so far, at about 61504 s UT (17:05:04).

The burst light curve shows a short initial pulse followed in ~170 s
period of quiescence by two long pulses with a total duration of ~60 s.

We have triangulated both emission episodes and have revealed that they
came from the same direction.

We have localized the burst to a preliminary, 3 sigma error box whose
coordinates are:
    ---------------------------------------------
    RA(2000), deg                 Dec(2000), deg
   ---------------------------------------------
   Center:
    313.089 (20h 52m 21s)  +9.558 ( +9d 33' 28")
   Corners:
    311.595 (20h 46m 23s)  +9.913 ( +9d 54' 46")
    313.791 (20h 55m 10s) +10.049 (+10d 02' 56")
    314.615 (20h 58m 28s)  +9.110 ( +9d 06' 36")
    312.407 (20h 49m 38s)  +9.046 ( +9d 02' 45")
   ---------------------------------------------
The error box area is 2.04 sq. deg, and its maximum dimension is 3.1 deg.

This box can be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB120716_T61507/IPN/

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