GCN Circular 38214
Subject
EP241113b/GRB 241113B: EP detection of GRB 241113B
Date
2024-11-14T09:01:38Z (14 days ago)
From
EP Team at NAOC/CAS <ep_ta@bao.ac.cn>
Via
Web form
Z. Y. Liu, M. Q. Huang (USTC), C. Y. Dai (NJU), X. P. Xu, M. H. Zhang, W. Yuan (NAO, CAS) report on behalf of the Einstein Probe team:
We report on the detection of an X-ray transient, designated EP241113b, by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission. The WXT position of EP241113b is R.A.= 110.233 deg, DEC = 46.800 deg (J2000) with an uncertainty of 2.5 arcmin (radius, 90% C.L. statistical and systematic).
The lightcurve of the transient observed by the WXT lasts around 100 seconds. The 0.5-4.0 keV spectrum can be fitted using an absorbed power law with a photon index of 1.5 +/- 0.7, and a column density of 2.7 (+/- 1.8) ×10^(21) cm^-2. The derived average flux is estimated to be around 1.5 (+/- 0.4 ) ×10^(-9) erg/s/cm^2 in 0.5-4.0 keV.
EP241113b is spatially and temporally consistent with GRB 241113B (GCN 38196; GCN 38212). The burst started at 2024-11-13T11:22:50 (UTC), which is about 15 seconds before the SVOM/ECLAIRs trigger time (2024-11-13T11:23:05).
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).