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GCN Circular 27595

Subject
Improved IPN error box for GRB 200415A (consistent with the Sculptor Galaxy)
Date
2020-04-16T16:16:25Z (4 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Ridnaia,
and T. Cline on behalf of the Konus-Wind team,

K. Hurley on behalf of the IPN,

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

A. Goldstein, M. S. Briggs, and C. Wilson-Hodge
on behalf of the Fermi GBM team, and

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, 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:

Using the Konus-Wind data we have
triangulated this GRB to an improved, but still preliminary,
3 sigma error box whose coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
    11.874 (00h 47m 30s) -25.194 (-25d 11' 37")
  Corners:
    11.760 (00h 47m 02s) -25.393 (-25d 23' 34")
    12.022 (00h 48m 05s) -25.302 (-25d 18' 09")
    11.987 (00h 47m 57s) -24.994 (-24d 59' 38")
    11.726 (00h 46m 54s) -25.085 (-25d 05' 05")
  ---------------------------------------------
The error box area is about 274 sq. arcmin, and its maximum
dimension is 27 arcmin (the minimum one is 14.7 arcmin).
The Sun distance was about 37 deg.

This error box reduces the initial error box (Svinkin et al.,
GCN Circ. 27585Not found
 
 
). The Sculptor Galaxy (NGC 253) is mostly inside
the box, strengthen the association the burst with the galaxy
proposed in GCN 27585Not found
 
 
.

We encourage an extensive search, both retrospective and
follow-up, for an accompanying radio emission.

This box may be further improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB200415_T31685/IPN/

The Swift (BAT) event data used for the IPN localization
came from the GUANO system (https://www.swift.psu.edu/guano/).

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