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.
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