BOOTES-4/MET optical observation of the newly discovered X-ray transient LXT 221107A
ATel #15775; D. R. Xiong, J. M. Bai, Y. F. Fan, K. Ye, C. J. Wang, Y. X. Xin, B. L. Lun, J. R. Mao, L. Xu, X. G. Yu, K. X. Lu, X. Ding, D. Q. Wang (Yunnan Observatories), A. J. Castro-Tirado, E. Fernandez-Garcia, Y. D. Hu (IAA-CSIC) and C. J. Perez del Pulgar (UMA) on behalf of the BOOTES team
on 24 Nov 2022; 06:11 UT
Credential Certification: Dingrong Xiong (xiongdingrong@ynao.ac.cn)
Subjects: Optical, X-ray, Binary, Star
ATel #15748 (on November 9 2022) reported a new X-ray transient LXT 221107A detected by LEIA on November 7 2022, which is most likely associated with the rotating variable star HD 251108 (ATEL #15754; ATEL #15756). From November 9 to November 22, we made a follow-up observation with BOOTES-4/MET 0.6m optical telescope (SDSS-g, SDSS-r and SDSS-i filters). For all three bands, HD 251108 darkened from November 9 to November 10, and brightened continuously from November 14 to November 22.
After correcting flat field and bias, we used PyRAF to implement aperture photometry. The two comparison stars (TYC 725-825-1, TYC 725-489-1) were chosen. The rms errors of differential magnitudes between comparison stars were considered as photometry errors. The mean magnitudes per night in SDSS-r band are given as follows:
MJD|SDSS r-mag|Error|Data
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59892.735| 9.70| 0.001 |2022-11-09
59893.893| 9.79| 0.002 |2022-11-10
59897.847| 9.79| 0.002 |2022-11-14
59898.655| 9.76| 0.002 |2022-11-15
59899.619| 9.72| 0.002 |2022-11-16
59900.644| 9.69| 0.001 |2022-11-17
59901.726| 9.65| 0.001 |2022-11-18
59902.575| 9.61| 0.004 |2022-11-19
59903.618| 9.60| 0.003 |2022-11-20
59904.650| 9.58| 0.003 |2022-11-21
59905.596| 9.57| 0.002 |2022-11-22
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The Burst Optical Observer and Transient Exploring System (BOOTES) is a world-wide automatic telescope network which aims to repaid follow-up of transient and astrophysical sources in the sky for which the first station was installed in 1998 (Hu et al. 2021). The fourth station of the BOOTE Network, BOOTES-4/MET, is located at the Lijiang Observatory of the Yunnan Observatories of China (Xiong et al. 2020).
We acknowledge the support of these staffs from the BOOTES telescope network.
