TITLE: GCN CIRCULAR NUMBER: 35966 SUBJECT: IPN triangulation of GRB 240315C (consistent with a fast X-ray transient EP240315a) DATE: 24/03/19 23:33:06 GMT FROM: Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru> D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, E. Burns on behalf of the IPN, and J. DeLaunay, A. Tohuvavohu, S. Barthelmy, J. Cummings, H. Krimm, and D. Palmer on behalf of the Swift-BAT team, report: The long-duration GRB 240315C has been detected by Konus-Wind, in the waiting mode, and Swift (BAT), so far, at about 73000 s UT (20:16:40). The burst was outside the coded field of view of the BAT. We have triangulated it to a Konus-BAT annulus centered at RA(2000)=159.341 deg (10h 37m 22s) Dec(2000)=+10.835 deg (+10d 50' 04") whose radius is 26.696 +/- 26.696 deg (3 sigma). This localization may be improved. The fast X-ray transient EP240315a (Zhang et al., GCN 35931) is inside the annulus and is consisted with the Konus-Wind ecliptic latitude response, lending support to the association of GRB 240315C and the transient. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB240315_T73000/IPN/ The Konus-Wind time history and spectrum will be given in a forthcoming GCN circular. View this GCN Circular online at https://gcn.nasa.gov/circulars/35966. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...