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GCN Circular 37892

Subject

EP241021a: optical follow-up observations with Xinglong Observatory

Date

2024-10-26T14:05:37Z (a month ago)

Edited On

2024-10-28T13:49:36Z (a month ago)

From

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

Edited By

Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov> on behalf of Xinglong Observatory at National Astronomical Observatories (NAOC), Chinese Academy of Sciences (CAS) <xinglong@nao.cas.cn>

Via

Web form

J.J-Jin(NAOC),H.Y. Mu(NAOC), Z.F(NAOC),Y.G. Sun, S.L, R.Wang Y.M Mao report on behalf of a large collaboration:
Following the detection of EP241021a by EP-WXT (Hu et al., GCN 37834Not found
 
 
), we observed the field of EP241021a using the 80-cm telescope at Xinglong Observatory, NAOC. We obtained 3x600s g-band frames with a median time of 2024-10-22T15:25:50 i.e., 34 hr after the EP trigger.No uncatalogued optical transient is detected in the stacked images within the 3 arcmin EP/WXT error circle.
Then we performed photometry on the Xinglong 2.16-m telescope with a median time of 2024-10-23T15:57:29 i.e., 58 hr after the EP trigger, and obtained 3x600s V-band frames. 
Within the error circle of the EP/WXT, we we detected the optical counterpart of EP241021a, at a position matching the optical counterpart identified by Fu et al., GCN 37840Not found
 
 
 (see also Gompertz et al., GCN 37835Not found
 
 
; Lipunov et al., GCN 37839Not found
 
 
; Fu et al., GCN 37842Not found
 
 
; Yang et al., GCN 37843Not found
 
 
; Li et al., GCN 37844Not found
 
 
; Li et al., GCN 37846Not found
 
 
; Zheng et al., GCN 37849Not found
 
 
; Moskvitin et al., GCN 37850Not found
 
 
; Pugliese et al., GCN 37852Not found
 
 
; Pérez-Fournon et al., GCN 37858Not found
 
 
; Bochenek et al., GCN 37869Not found
 
 
; Kumar et al., GCN 37875Not found
 
 
). 

We performed aperture photometry on the stacked g and V-band images and calibrated them with Pan-STARRS sources in the field. The observed magnitudes are as follows: 

Date_obs     |  Telescope|   UT    |  Exp. Time     |    Filter   |  Mag    |  Mag_err

----------------------------------------------------------------------------------------
2024-10-22  |  80-cm  |  15:25:50  |  3x600s       |   g      |  *21.51  |  0.032

2024-10-23  |  216-cm |  15:57:29  |  3x600s       |   V      |  22.468  |  0.477