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GCN Circular 16116

Subject
IPN Triangulation of GRB 140416A (long/very intense)
Date
2014-04-18T14:35:36Z (10 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
K. Hurley and J. Goldsten, on behalf of the MESSENGER NS GRB team,

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

V. Connaughton, M. S. Briggs, C. Meegan, V. Pelassa, and A. Goldstein,
on behalf of the Fermi GBM team,

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

G. Di Cocco, F. Fuschino, M. Galli, C. Labanti, and M. Marisaldi, on
behalf of the AGILE MCAL team, report:

The long-duration very intense GRB 140416A (P. Jenke, GCN Circ. 16115) 
has been observed by Fermi (GBM: trigger 419304403), Konus-Wind, AGILE 
(MCAL), MESSENGER (GRNS), and Mars-Odyssey (HEND), so far, at about 5201 
s UT (01:26:41).

These annuli intersect to form a long arc, whose coordinates are:
  ---------------------------------------------
     RA(2000), deg                 Dec(2000), deg
    ---------------------------------------------
    Center:
      40.186 (02h 40m 45s) +39.527 (+39d 31' 37")
    Corners:
      25.842 (01h 43m 22s) +45.226 (+45d 13' 35")
      27.972 (01h 51m 53s) +44.893 (+44d 53' 35")
      50.081 (03h 20m 20s) +30.017 (+30d 01' 02")
      50.783 (03h 23m 08s) +28.603 (+28d 36' 11")
    ---------------------------------------------
The error box area is 2.023 sq. deg, and its maximum dimension is 25.8 
deg (the minimum one is 0.164 deg).

This error box may be improved.

Because the Earth, the Wind, the Mars-Odyssey, and the MESSENGER 
satellites are nearly aligned at the moment (the angular distance 
between Wind and MESSENGER is 10.3 deg and between Wind and Mars-Odyssey 
is 170 deg), the annuli intersect at grazing incidence and the resulting 
3-sigma box is long.

The center of the GBM ground position given in P. Jenke, GCN Circ. 16115 
(that is RA, Dec, RErr = 35.4, 43.9, 1.0 deg) is 5.4 deg from the box 
center and is 1.5 deg from the center line of the Konus-MESSENGER annulus.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB140416_T05196/IPN/
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