GOTO065054.49+593624.51: detection of X-ray emission by Einstein Probe
ATel #16851; C. Y. Wang (THU), A. Li (BNU), H. Y. Liu, Z. X. Ling, W. Yuan (NAOC), on behalf of the Einstein Probe team
on 8 Oct 2024; 07:52 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Yuan Liu (liuyuan@bao.ac.cn)
Subjects: X-ray, Transient
Following the discovery of the bright optical galactic transient GOTO065054.49+593624.51 (ATel #16842, T. Killestein et al., ATel #16847, Amar Deo Chandra et al.), we performed a follow-up observation with the Follow-up X-ray Telescope (FXT) on board the Einstein Probe (EP). The observation started at 2024-10-06T15:03:44 (UTC) with an exposure time of 3911 seconds. An X-ray source is detected at RA = 102.7272 deg, Dec = 59.6078 deg (J2000) with an uncertainty of 10 arcsec in radius (90% C.L. statistical and systematic). No previously known X-ray source is found within the error circle. The new X-ray source is 3.6 arcsec away from the reported position of the optical transient. We thus consider the X-ray emission being associated with GOTO065054.49+593624.51. The average 0.5-10 keV spectrum can be fitted with an absorbed power law with a photon index of 3.23(+0.68/-0.56) and a column density of 7.1(+6.8/-4.3) x 10^20 cm^-2, giving an average unabsorbed flux of 8.1(+1.9/-1.4) x 10^(-14) erg/s/cm^2 in 0.5-10 keV. The uncertainties are at the 90% confidence level for the above parameters.
For queries on more information about the X-ray source and data analysis, or coordination of multi-wavelength observations, please contact us at EP science center (ep_ta@bao.ac.cn). The contact persons are ChenYu Wang and An Li.
Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics).
