GCN Circular 43754
Subject
EP260214a: NOT optical upper limits
Event
Date
2026-02-15T15:07:18Z (a day ago)
From
L. B. He at NAOC <helb@bao.ac.cn>
Via
Web form
L.B. He (NAOC), S.Y. Fu (HUST), J. An, X. Liu, S.Q. Jiang, Z.P. Zhu, D. Xu (NAOC), J.P.U. Fynbo (DAWN/NBI), K. Valeckas (NOT) report on behalf of a large collaboration:
We observed the field of EP260214a (Li et al., GCN 43742) using the 2.56-m Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations started at 03:39:29.978 UT on 2026-02-15, i.e., 7.02 hrs after the EP trigger, and we obtained 3x300 s frames in the Sloan r-band and 5 x 200 s frames in the Sloan z- band.
No new optical source is detected within the EP/FXT error circle (Li et al., GCN 43751), down to 5-sigma upper limits of r ~ 23.1 and z ~ 21.8, calibrated with nearby Pan-STARRS stars and not corrected for Galactic extinction.
These upper limits are consistent with the ones previously reported (Li et al., GCN 43746; Watson et al. GCN 43753).