GCN Circular 37206
Subject
GRB 240819A: X-ray follow-up observation with EP-FXT
Date
2024-08-20T06:37:42Z (2 months ago)
From
EP Team at NAOC/CAS <ep_ta@bao.ac.cn>
Via
Web form
A.Li (BNU), H. Sun, H. Q. Cheng, Z. X. Ling (NAOC, CAS), J. Q. Peng, J. Guan, C. K. Li, Y. Chen, S. M. Jia, W. W. Cui, H. Feng, D. W. Han, W. Li, C. Z. Liu, F. J. Lu, L. M. Song, J. Wang, J. J. Xu, J. Zhang, S. N. Zhang, H. S. Zhao, X. F. Zhao (IHEP, CAS), J. Wang, L. P. Xin, Y. Liu, C. C. Jin, W. Yuan, C. Zhang (NAOC, CAS), E. Kuulkers, A. Santovincenzo (ESA), P. O'Brien (Univ. of Leicester), K. Nandra, A. Rau (MPE), B. Cordier (CEA) on behalf of the Einstein Probe and SVOM teams
We performed an observation of SVOM/Eclairs-triggered GRB 240819A with the Follow-up X-ray Telescope (FXT) on board the Einstein Probe (EP) mission. The observation began at 2024-08-19T09:29:55 (UTC), and the exposure time is about 5.7 ks. FXT-A detected 3 uncatalogued sources in the 90% localization error circle (with a radius of 10.4 arcmin centered at RA, DEC = 310.909 deg, 49.589 deg), and two of them are also detected by FXT-B.
The following table lists the detailed information of the three X-ray sources detected by FXT-A. The positions are given with an uncertainty of 10 arcsec (radius, 90% C.L. statistical and systematic). The 0.5 - 10 keV flux is derived from FXT-A data; The uncertainties of flux are at the 90% confidence level.
Source name | RA | DEC | Estimated Flux |
| deg | deg | (erg/s/cm^2) |
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EP J204334.6+493448 | 310.8943 | 49.5800 | 7.5(+/-4.0) x 10^-14
EP J204347.6+493054 | 310.9483 | 49.5149 | 2.1(+/-0.6) x 10^-13
EP J204244.0+494023 | 310.6835 | 49.6730 | 1.7(+/-0.5) x 10^-13
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The above observation was made with the EP-FXT instrument. 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). EP is a mission of the Chinese Academy of Sciences in collaboration with ESA, MPE and CNES.