School of Physics & Astronomy

| site map

Home
About
The Swift Mission UK involvement Instruments
GRBs before Swift GRBs in the Swift era Non-GRB science with Swift GRB research at Leicester
Spacecraft status Swift in the press Swift Videos
Support
Helpdesk TOO requests Guest Investigator program Target visibility checker Search transient database
Data Access
Overview Quick Look GCN Notices Download obs data Search obs catalogue The 2SXPS catalogue The LSXPS catalogue
Data Analysis
Data analysis overview Swift software
Build XRT products
BAT data analysis guide XRT data analysis guide XRT digest UVOT data analysis guide
Data Products
GRBs Full dataset Swift XRT products for GRBs XRT positions XRT light curves XRT spectra XRT GRB catalogue XRT GRB images Burst analyser Prompt data GRB field info XRT prompt analysis External triggers Einstein Probe follow up SVOM follow up Neutrino follow up Gravitational Wave follow up
Publications
Publication index Published papers Submitted papers XRT instrument papers ATels GCNs Conferences
Links
Databases NED Simbad GCN circulars archive GRB data table Software & Tools Swift Software (HEASoft) Xanadu WebPIMMS Institutional Swift Sites GSFC PSU OAB SSDC MSSL University of Leicester

Swift-XRT spectra of EP250821a — Source 8

Last updated at 2025-08-29 at 13:30:40 UTC

About these products.

Time-averaged spectrum (T0 + 5095 to 651111 s)

Download spectral files for Time-averaged spectrum.

Plots to download

PC mode spectrum of EP250821a - source 8

PC mode. Mean photon arrival: T0+134683 s

N_H (Galactic)	7.30 × 10²⁰ cm^-2
N_H (intrinsic)	2.1 (+8.1, -2.1) × 10²¹ cm^-2
z of absorber	0
Photon index/th>	9.78 (+??, -12.02)
Flux (0.3-10 keV) (Observed)	1.3 (+1.8, -1.1) × 10^-14 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	9 (+1.00 × 10¹³, -9) × 10^-13 erg cm^-2 s^-1
Counts to flux (obs)	2.45 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	1.64 × 10^-9 erg cm^-2 ct^-1
W-stat What's this?(dof)	7.17 (5)
Spectrum exposure	17.3 ks