IPN triangulation of GRB 241021A (long)

The long-duration GRB 241021A was detected by Konus-Wind, INTEGRAL (SPI-ACS), and Mars-Odyssey (HEND) at about 53930 s UT (14:58:50). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 267.026 (17h 48m 06s) +29.592 (+29d 35' 31") Corners: 265.186 (17h 40m 45s) +28.733 (+28d 43' 57") 268.672 (17h 54m 41s) +30.598 (+30d 35' 53") 268.925 (17h 55m 42s) +30.399 (+30d 23' 57") 265.442 (17h 41m 46s) +28.544 (+28d 32' 37") --------------------------------------------- The error box area is 3597 sq. arcmin, and its maximum dimension is 3.6 deg (the minimum one is 16 arcmin). The Sun distance was 69 deg. This localization may be improved. A triangulation map and a HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB241021_T53930/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.