GCN Circular 34454

Subject

IPN triangulation of GRB 230815B

Event

GRB 230815B

Date

2023-08-16T18:47:08Z (3 years ago)

From

Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>

Via

Web form

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

A. Ridnaia, D. Frederiks, D. Svinkin, A. Lysenko,
and T. Cline on behalf of the Konus-Wind 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 long-duration GRB 230815B
(AstroSat CZTI detection: Pari et al., GCN 34447Loading...
 
 ;
GECAM-B and GECAM-C detection: Xiong et al., GCN 34448Loading...
 
 )
has been detected by Konus-Wind, INTEGRAL (SPI-ACS),
Swift (BAT), AstroSat (CZTI), GECAM-B, GECAM-C,
and Mars-Odyssey (HEND), so far, at about 58049 s UT (16:07:29).
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:
  307.334 (20h 29m 20s)  +4.190 ( +4d 11' 24")
 Corners:
  307.122 (20h 28m 29s)  +2.976 ( +2d 58' 33")
  307.518 (20h 30m 04s)  +5.411 ( +5d 24' 38")
  307.571 (20h 30m 17s)  +5.398 ( +5d 23' 53")
  307.175 (20h 28m 42s)  +2.963 ( +2d 57' 47")
 ---------------------------------------------
The error box area is 487 sq. arcmin, and its maximum
dimension is 2.5 deg (the minimum one is 3 arcmin).
The Sun distance was 154 deg.

This localization may be improved.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB230815_T58054/IPN

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