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GCN Circular 17993

Subject
IPN Triangulation of GRB 150702A
Date
2015-07-05T16:18:24Z (9 years ago)
From
Valentin Pal'shin at Ioffe Inst <val@mail.ioffe.ru>
K. Hurley, on behalf of the IPN,

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

A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C.
Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,

S. Barthelmy, J. Cummings, N. Gehrels, H. Krimm, and D. Palmer, on
behalf of the Swift-BAT team, and

W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr,
on behalf of the GRS-Odyssey GRB team, report:

GRB 150702A, localized by Fermi-LAT (Vianello, Monzani, & Axelsson GCN 
Circ. 17989), has been also observed by Fermi (GBM trigger 457574201), 
Konus-Wind, INTEGRAL (SPI-ACS), Swift (BAT), and Mars Odyssey (HEND), so 
far, at about 86198 s UT (23:56:38). The burst was outside the coded 
field of view of the BAT.

We have triangulated this GRB to a Konus-MarsOdyssey annulus centered at
RA(2000)=95.937 deg (06h 23m 45s)  Dec(2000)=+24.107 deg (+24d 06' 24"), 
whose radius is 88.902 �� 0.055 deg (3 sigma).

This annulus intersects the Fermi-LAT 90% CL error circle (Vianello, 
Monzani, & Axelsson, GCN Circ. 17989) to form an error box whose area is 
about 5 times smaller than that of the LAT error circle, and whose
corners are:
-----------------------------------------------
    RA(2000), deg                 Dec(2000), deg
-----------------------------------------------
1 53.1503 (03h 32m 36s) -57.2987 (-57d 17' 55")
2 53.2998 (03h 33m 12s) -57.2234 (-57d 13' 24")
3 52.2673 (03h 29m 04s) -56.7738 (-56d 46' 26")
4 52.1653 (03h 28m 40s) -56.8692 (-56d 52' 09")
-----------------------------------------------

Both XRT sources (D'Avanzo et al., GCN Circ. 17991) are outside the IPN 
annulus and, hence, unlikely related to the GRB.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB150702_T86198/IPN/
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