IPN triangulation of GRB 210518A

Report the long-duration GRB 210518A (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 30045) was detected by Fermi (GBM trigger 643035854), Konus-Wind, and Mars-Odyssey (HEND) at about 47050 s UT (13:04:10). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 271.081 (18h 04m 19s) +50.035 (+50d 02' 07") Corners: 288.400 (19h 13m 36s) +51.036 (+51d 02' 11") 287.357 (19h 09m 26s) +51.489 (+51d 29' 21") 255.561 (17h 02m 15s) +46.119 (+46d 07' 07") 256.707 (17h 06m 50s) +46.052 (+46d 03' 09") --------------------------------------------- The error box area is 9.4 sq. deg, and its maximum dimension is 22.0 deg (the minimum one is 26 arcmin). The Sun distance was 96 deg. This box may be improved. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB210518_T47051/IPN The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.