BOOTES-4/MET and BOOTES-2/TELMA optical observations of the new X-ray transient LXT 221227A
ATel #15843; D. R. Xiong, J. M. Bai, Y. F. Fan, K. Ye, C. J. Wang, Y. X. Xin, B. L. Lun, J. R. Mao, X. H. Zhao, 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 4 Jan 2023; 08:59 UT
Credential Certification: Dingrong Xiong (xiongdingrong@ynao.ac.cn)
Subjects: Optical, X-ray, Transient
On 2022-12-27 LEIA detected a new X-ray transient, named LXT 221227A. The source position is RA=147.454 deg, DEC=4.677 deg (J2000), with an uncertainty of radius 2.2 arcmin (ATEL 15834).
We observed the source position with BOOTES-4/MET and BOOTES-2/TELMA 0.6m automatic optical telescopes. We took the image of SDSS DR16 as reference, and did not detect any new optical transient source within the uncertainty region of the source. The upper limits of magnitudes (without being corrected for Galactic extinction) are given as follows.
UT (start) | Upper Limit (error) | Exposure Time | Filter | Telescope
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22-12-31 02:32:46.46 | 19.5 (0.03) | 6*300s (co-added) | Clear | BOOTES-2
23-01-01 17:01:35.24 | 19.57 (0.03) | 15*120s (co-added) | SDSS-i | BOOTES-4
23-01-02 17:35:10.96 | 19.13 (0.03) | 10*120s (co-added) | SDSS-i | BOOTES-4
23-01-03 15:48:21.93 | 19.05 (0.07) | 18*120s (co-added) | SDSS-i | BOOTES-4
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There are no ASAS-SN variable stars catalog sources (Jayasinghe+, 2018-2020) within the uncertainty region of the source. One galaxy (RA=147.4435 deg, DEC=4.685 deg) classified by SDSS DR16 is in the uncertainty region of the source. The SDSS i-band magnitude (without being corrected for Galactic extinction) from the galaxy is 18.75+/-0.16 on January 1st, 2023. Compared with the magnitude from SDSS DR16 (18.67), the source cannot be determined to be lightened or darkened due to large error.
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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 BOOTES Network, BOOTES-4/MET, is located at the Lijiang Observatory of the Yunnan Observatories of China (Xiong et al. 2020). The BOOTES-2/TELMA robotic telescope at IHSM La Mayora (UMA-CSIC) in Algarrobo Costa (Malaga, Spain). We acknowledge the support of these staffs from the BOOTES telescope networks.
