GCN Circular 44744
Subject
IPN triangulation of GRB 260527A / EP260527a
Event
Date
2026-05-30T14:35:28Z (6 hours ago)
From
Dmitry Svinkin at Ioffe Institute <dmitrysvinkin@gmail.com>
Via
Web form
A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin
on behalf of the HEND/Mars Odyssey team,
D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia,
and T. Cline on behalf of the Konus-Wind team,
E. Burns on behalf of the IPN,
Y. Kawakubo, A. Yoshida, T. Sakamoto, S. Sugita (AGU),
K. Yamaoka (Nagoya U), S. Nakahira (JAXA), Y. Asaoka (ICRR), S. Torii,
Y. Akaike, K. Kobayashi (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U),
N. Cannady (GSFC), M. L. Cherry (LSU), S. Ricciarini (U of Florence),
P. S. Marrocchesi (U of Siena),
on behalf of the CALET collaboration,
Chen-Wei Wang (IHEP), Shao-Lin Xiong (IHEP), Shuang-Nan Zhang (IHEP)
on behalf of the Insight-HXMT team,
Zheng-Hang Yu, Chen-Wei Wang, Shao-Lin Xiong, Chao Zheng,
Cheng-Kui Li (IHEP) on behalf of GECAM team,
and
W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr,
and A.S. Gardner on on behalf of the GRS-Odyssey GRB team,
report:
The short-duration GRB 260527A
(Konus-Wind detection: Svinkin et al., GCN 44722;
GECAM-B detection: Yu et al., GCN 44724;
CALET-GBM detection: Kawakubo et al., GCN 44726;
Insight-HXMT detection: Wang et al., GCN 44735)
was detected by Konus-Wind, CALET (GBM trigger 1463897683),
GECAM-B, Insight-HXMT(HE), and Mars-Odyssey (HEND)
at about 22570 s UT (06:16:10).
We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
---------------------------------------------
RA(2000), deg Dec(2000), deg
---------------------------------------------
Center:
192.924 (12h 51m 42s) +1.318 ( +1d 19' 03")
Corners:
192.308 (12h 49m 14s) +0.301 ( +0d 18' 02")
192.793 (12h 51m 10s) +1.224 ( +1d 13' 25")
193.417 (12h 53m 40s) +2.085 ( +2d 05' 08")
193.052 (12h 52m 13s) +1.406 ( +1d 24' 23")
---------------------------------------------
The error box area is 457 sq. arcmin, and its maximum
dimension is 2.1 deg (the minimum one is 6.4 arcmin).
The Sun distance was 125 deg.
This localization may be improved.
The fast X-ray transient EP260527a (Yang et al., GCN 44718) is inside the box strengthen the association of the transient and GRB 260527A.
A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB260527_T22572/IPN/