TITLE: GCN CIRCULAR NUMBER: 36781 SUBJECT: IPN triangulation of GRB 240619C DATE: 24/06/28 20:24:16 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,

G. Waratkar, V. Jethwani, J.Joshi, V. Bhalerao, D. Bhattacharya, and S. Vadawale, on behalf of the Astrosat-CZTI 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 240619С (AstroSat-CZTI detection: Joshi et al., GCN 36711; Fermi-GBM detection: Bala, GCN 36716; NuSTAR anti-coincidence shields detection: Grefenstette, GCN 36718) was detected by AstroSat (CZTI), Konus-Wind, Fermi (during GBM trigger 740533060 record), Swift (BAT), INTEGRAL (SPI-ACS), NuSTAR (ACS), and Mars-Odyssey (HEND) at about 85480 s UT (23:44:40). 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: 350.990 (23h 23m 58s) -72.469 (-72d 28' 08") Corners: 352.954 (23h 31m 49s) -73.034 (-73d 02' 03") 352.985 (23h 31m 56s) -72.971 (-72d 58' 14") 349.140 (23h 16m 34s) -71.884 (-71d 53' 02") 349.100 (23h 16m 24s) -71.947 (-71d 56' 50") --------------------------------------------- The error box area is 307 sq. arcmin, and its maximum dimension is 1.6 deg (the minimum one is 3.2 arcmin). The Sun distance was 114 deg.

The IPN localization is consistent with, but reduces the area of, the Fermi-GBM localization.

This localization may be improved.

A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB240619_T85480/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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