TITLE: GCN CIRCULAR NUMBER: 39015 SUBJECT: IPN triangulation of GRB 250119B DATE: 25/01/23 15:15:15 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. Lysenko, A. Ridnaia, 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 bright, long-duration GRB 250119B (Fermi-GBM detection: The Fermi GBM team, GCN 38979; BALROG localization: Preis et al., GCN 38980; INTEGRAL-SPI-ACS detection: Barria et al., GCN 38997; Swift-BAT/GUANO detection: Ronchini et al., 39007) was detected by Fermi (GBM trigger 758968026), Konus-Wind, INTEGRAL (SPI-ACS), Swift (BAT), and Mars-Odyssey (HEND) at about 30421 s UT (08:27:01). 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: 304.147 (20h 16m 35s) +22.039 (+22d 02' 20") Corners: 308.304 (20h 33m 13s) +21.164 (+21d 09' 51") 307.706 (20h 30m 49s) +21.495 (+21d 29' 42") 299.904 (19h 59m 37s) +22.564 (+22d 33' 49") 300.555 (20h 02m 13s) +22.329 (+22d 19' 46") --------------------------------------------- The error box area is 1.4 sq. deg, and its maximum dimension is 7.9 deg (the minimum one is 11.5 arcmin). The Sun distance was 42 deg.
This localization may be improved.
The IPN localization is consistent with, but reduces the area of, the Fermi-GBM/RoboBA (GCN 38979), BALROG (GCN 38980), and Swift-BAT/GUANO (GCN 39007) localizations.
The burst lightcurve shows two separate emission episodes at ~T0(KW) and at ~T0(KW)+250 s. The IPN localization of the second emission episode is consistent with the first one.
A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB250119_T30434/IPN The HEALPix triangulation map is the multi-order HEALPix in units of probability density.
The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.
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