GCN Circular 45203
Subject
EP260723a: NOT optical conterpart confirmation
Event
Date
2026-07-24T07:50:37Z (3 days ago)
Edited On
2026-07-24T13:18:25Z (2 days ago)
From
L. B. He at NAOC <helb@bao.ac.cn>
Edited By
Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of L. B. He at NAOC <helb@bao.ac.cn>
Via
Web form
L.B. He, Z.P. Zhu, J. An, X. Liu, S.Q. Jiang, D. Xu (NAOC), S.Y. Fu (HUST), J.P.U. Fynbo (DAWN/NBI), V. Vuolteenaho (NOT) report:
We observed the field of EP260723a detected by EP (Zhang et al., GCN 45201) using the 2.56m Nordic Optical Telescope (NOT) equipped with the ALFOSC camera.
An uncatalogued source is detected within the EP-WXT error circle at coordinates:
R.A. (J2000): 00:11:54.04 (2.97518)
Dec. (J2000): -12:05:54.6 (-12.09851)
with an uncertainty of ~ 0.5 arcsec . The source had r = 22.10 +/- 0.05 at a median time of 10.18 hr post-trigger, calibrated with Pan-STARRS DR2 and not corrected for Galactic extinction.
This position is consistent with the previously reported optical conterpart (Eyles-Ferris et al., GCN 45202). We thus think this is the optical counterpart of EP260723a.