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GCN Circular 45882

Subject
EP261010a: NOT optical upper limits
Event
EP261010a
Date
2026-10-10T04:48:39Z (3 days ago)
From
Zipei Zhu at NAOC <zpzhu@nao.cas.cn>
Via
Web form
Z.P. Zhu, X. Liu, D. Xu, J. An, L.B. He, S.Q. Jiang (NAOC), S.Y. Fu, L. Lei (HUST), J.P.U. Fynbo (DAWN/NBI), A.S. Zanuzzi (NOT) report:

We observed the field of EP261010a detected by the Einstein Probe (Li et al., GCN 45880), using the ALFOSC camera mounted on the Nordic Optical Telescope (NOT). We obtained 3 x 300 s frames in the SDSS r filter and 5 x 200 s in the z filter, starting on 2026-10-10 at 01:43:35 UTC, i.e., 1.4 hr after the EP trigger.

No uncatalogued optical source is detected in the stacked images within the EP/FXT error circle, down to 5-sigma limiting magnitudes of r > 23.9 and z > 21.5, calibrated with Legacy Survey stars in the field. 

Near-infrared follow-up observations are encouraged.
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