GCN Circular 44254

Subject

EP-WXT01709259790: Xinglong optical upper limit

Date

2026-04-10T14:18:44Z (5 days ago)

Edited On

2026-04-10T14:29:42Z (5 days ago)

From

Xinglong Observatory at National Astronomical Observatories (NAOC), Chinese Academy of Sciences (CAS) <xinglong@nao.cas.cn>

Edited By

Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Xinglong Observatory at National Astronomical Observatories (NAOC), Chinese Academy of Sciences (CAS) <xinglong@nao.cas.cn>

Via

Web form

Min-He (NAOC), Junjie-Jin (NAOC), Haiyang-Mu (NAOC), Sen-Liu (NAOC), Yiming-Mao (NAOC), Pengliang-Du (NAOC), Zhou-Fan (NAOC), Hong-Wu (NAOC) report on behalf of a large collaboration:

Following the detection of EP-WXT01709259790, we observed the field of EP-WXT01709259790 using the 2.16-m telescope at Xinglong Observatory, NAOC. We obtained 3x300s clear-band frames with a median time of 2026-04-10T12:16:23, 52 minutes after the EP trigger.

No uncatalogued optical transient is detected in the stacked images within the 3 arcmin EP/WXT error circle (WXT01709259790), down to 3-sigma limiting magnitudes of 22.18 mag for 2.16-m, calibrated with Pan-STARRS sources in the field. Also there is no apparent brightening for the catalogued sources within the error circle.