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.