GCN Circular 36829
Subject
IPN triangulation of GRB 240628B (short)
Date
2024-07-05T14:53:53Z (a year ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
Via
Web form
D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko,
on behalf of the IPN,
A. Goldstein, M. S. Briggs, C. Wilson-Hodge,
and E. Burns on behalf of the Fermi GBM team,
E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu
on behalf of the Swift-BAT team, report:
The short-duration GRB 240628B
was detected by Fermi (GBM trigger 741296200), Swift (BAT),
and INTEGRAL (SPI-ACS) at about 70596 s UT (19:36:36).
The burst was outside the coded field of view of the BAT.
We have triangulated it to the following annuli:
---------------------------------------------------
annulus R.A. Dec. R dR (3sigma)
(deg) (deg) (deg) (deg)
---------------------------------------------------
GBM-SPI-ACS 30.342 -81.135 79.219 1.517
GBM-BAT 268.041 11.906 43.493 43.493
---------------------------------------------------
The annuli intersect to form a long arc which was partially Earth occulted for Fermi.
The area of the preliminary 3-sigma IPN localization
is 224.5 sq. deg, and its maximum dimension is 70.7 deg
(the minimum one is 3 deg).
This localization may be improved.
A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB240628_T70595/IPN/
The HEALPix triangulation map is the multi-order HEALPix in units of probability density.