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GCN Circular 23247

Subject
IPN Triangulation of GRB 180914A (long)
Date
2018-09-17T18:26:55Z (5 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@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,

D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Kozlova,
and T. Cline on behalf of the Konus-Wind team,

A. Goldstein, M. S. Briggs, and C. Wilson-Hodge
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

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

The long-duration GRB 180914A (Bissaldi et al., GCN Circ.23225;
Poolakkil et al., GCN Circ. 23227) was detected by
Fermi (GBM trigger 558621112), INTEGRAL (SPI-ACS), Konus-Wind,
and Mars-Odyssey (HEND) at about 45107 s UT (12:31:47).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
    53.107 (03h 32m 26s)  -5.687 ( -5d 41' 14")
  Corners:
    52.535 (03h 30m 08s)  -5.415 ( -5d 24' 53")
    53.948 (03h 35m 48s)  -8.072 ( -8d 04' 21")
    53.677 (03h 34m 42s)  -5.954 ( -5d 57' 13")
    52.197 (03h 28m 47s)  -3.090 ( -3d 05' 23")
  ---------------------------------------------
The error box area is 2.36 sq. deg, and its maximum
dimension is 5.28 deg (the minimum one is 45.48 arcmin).
The Sun distance was 119 deg.

This box may be improved.

The distance between the XRT source (D'Elia et al., GCN circ. 23229) and 
the box center is 4.1 arcmin, supporting the association of the 
transient and the GRB.

We thank Robert Wilson for noticing this.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB180914_T45107/IPN

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