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GCN Circular 17398

Subject
IPN Triangulation of GRB 150202B
Date
2015-02-04T10:04:20Z (9 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,

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

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

The long-duration GRB 150202B (Axelsson and Vianello., GCN Circ. 17385) 
has been detected by Fermi (Pelassa., GCN Circ. 17388), Konus-Wind, 
MESSENGER (GRNS), INTEGRAL (SPI-ACS), and Swift (BAT), so far, at about 
86348 s UT (23:59:08). The burst was outside the coded field of view of 
the BAT.

We have triangulated it to a Konus-MESSENGER annulus centered at 
RA(2000)=126.992 deg (08h 27m 58s)  Dec(2000)=+15.280 deg (+15d 16' 
50"), whose radius is 52.564 +/- 0.201 deg (3 sigma).

The annulus intersects the LAT (statistical-only) error circle (GCN 
17385) thereby confirming the association of the high-energy emission 
with GRB 150202B. The area of the combined IPN/LAT error region is 570 
sq. arcmin.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB150202_T86354/IPN/

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