TITLE:   GCN CIRCULAR
NUMBER:  36624
SUBJECT: IPN triangulation of GRB 240531A (short)
DATE:    24/06/05 19:51:13 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,

S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu
on behalf of the Swift-BAT team,

and

G. Waratkar (IITB), J.Joshi (IUCAA), A. Vibhute (IUCAA),
V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA),
A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL)
on behalf of the Astrosat-CZTI team, report:

The short-duration GRB 240531A
(Astrosat-CZTI detection: Wang et al., GCN 36586)
was detected by Astrosat (CZTI), Konus-Wind (KW), in the waiting mode,
and Swift (BAT) at about 68052 s UT (18:54:12).
The burst occurred during Swift slewing interval
(when normal BAT triggering is disabled).

We have triangulated it to a BAT-Konus annulus centered at
RA(2000)=91.405 deg (06h 05m 37s) Dec(2000)=+25.128 deg (+25d 07' 40"),
whose radius is 84.474 +/- 16.042 deg (3 sigma).

The annulus combined with Swift and Astrosat Earth occultation information, and the KW ecliptic latitude response, gives 3848 sq. deg (3 sigma) localization region.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB240531_T68052/IPN
The HEALPix triangulation map is the multi-order HEALPix in units of probability density.