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GCN Circular 24128

Subject
IPN Triangulation of GRB 190415A
Date
2019-04-18T16:25:31Z (5 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Kozlova,
and T. Cline on behalf of the Konus-Wind team,

K. Hurley, on behalf of the IPN,

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

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

The long-duration GRB 190415A
(Insight-HXMT/HE detection: Luo et al., GCN Circ. 24125)
was detected by Fermi (GBM trigger 576994194),
INTEGRAL (SPI-ACS), Konus-Wind, Swift (BAT), and Insight (HXMT/HE)
at about 14990 s UT (04:09:50).
The burst was outside the coded field of view of the BAT.

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
    28.053 (01h 52m 13s) +20.221 (+20d 13' 16")
  Corners:
    26.606 (01h 46m 25s) +21.774 (+21d 46' 27")
    27.221 (01h 48m 53s) +22.093 (+22d 05' 34")
    29.374 (01h 57m 30s) +18.606 (+18d 36' 22")
    28.770 (01h 55m 05s) +18.296 (+18d 17' 44")
  ---------------------------------------------
The error box area is about 2.6 sq. deg, and its maximum
dimension is 4.1 deg (the minimum one is 39 arcmin).
The Sun distance was about 10 deg.

This box may be improved.

The box lies outside the 1 sigma of the alternative
localization of the Fermi-GBM detection BALROG
(Kunzweiler et al., GCN Circ. 24123; ~0.6 deg stat. + 1 deg sys.),
while being consistent with 1 sigma contours of the Fermi-GBM final
position.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB190415_T14986/IPN

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