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GCN Circular 13271

IPN Triangulation of GRB 120427A
2012-04-28T16:51:31Z (12 years ago)
Valentin Pal'shin at Ioffe Inst <>
K. Hurley on behalf of the Mars Odyssey and MESSENGER GRB teams,

I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin,
on behalf of the HEND-Odyssey GRB team,

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 moderately intense single-pulsed GRB 120427A was observed by Fermi 
(GBM: trigger 357182249), INTEGRAL (SPI-ACS), Konus-Wind, MESSENGER 
(GRNS), Mars Odyssey (HEND), and Suzaku (WAM) at about 4646 s UT (01:17:26).

We have triangulated it to a preliminary, 3 sigma error box whose
coordinates are:
   RA(2000), deg                 Dec(2000), deg
   224.935 (14h 59m 44s) +29.311 (+29d 18' 39")
   224.688 (14h 58m 45s) +29.951 (+29d 57' 03")
   225.169 (15h 00m 41s) +29.418 (+29d 25' 06")
   225.175 (15h 00m 42s) +28.663 (+28d 39' 47")
   224.701 (14h 58m 48s) +29.203 (+29d 12' 11")
The error box area is 1109 sq. arcmin (0.31 sq. deg), and its maximum
dimension is 81 arcmin (the minimum one is 28 arcmin). The Sun distance 
is ~136 deg.

This box may be improved.

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