TITLE:   GCN CIRCULAR
NUMBER:  36726
SUBJECT: IPN triangulation of GRB 240615A (short)
DATE:    24/06/21 17:27:05 GMT
FROM:    Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>

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

D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko,
and T. Cline on behalf of the Konus-Wind team,

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,

and

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

The short-duration GRB 240615A
(Fermi-GBM detection: The Fermi GBM team, GCN 36671;
Swift-BAT/GUANO detection and localization: DeLaunay et al., GCN 36672;
Konus-Wind detection: Frederiks et al., GCN 36677;
GECAM-C detection: Tan et al., GCN 36682)
was detected by Fermi (GBM trigger 740166710), Swift (BAT),
Konus-Wind, INTEGRAL (SPI-ACS), GECAM-C, and Mars-Odyssey (HEND)
at about 64305 s UT (17:51:45).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
  326.163 (21h 44m 39s) +38.634 (+38d 38' 02")
 Corners:
  326.204 (21h 44m 49s) +38.689 (+38d 41' 21")
  326.141 (21h 44m 34s) +38.735 (+38d 44' 07")
  326.122 (21h 44m 29s) +38.578 (+38d 34' 42")
  326.186 (21h 44m 45s) +38.532 (+38d 31' 56")
 ---------------------------------------------
The error box area is 31 sq. arcmin, and its maximum
dimension is 12 arcmin (the minimum one is 3.3 arcmin).
The Sun distance was 95 deg.

The IPN localization is consistent with, but reduces the area of,
the Swift-BAT/GUANO localization. All the sources reported by Swift-XRT (GCN 36683) are outside the IPN box.

This localization may be improved.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB240615_T64306/IPN
The HEALPix triangulation map is the multi-order HEALPix in units of probability density.