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
GRB Products
Full dataset Swift XRT products for GRBs XRT positions XRT light curves XRT spectra XRT GRB catalogue XRT GRB images Burst analyser Prompt dataset GRB field info XRT prompt analysis
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 GRB 070721B

Last updated after receiving ObsID 00285654003, version 8

Data were analysed using HEASOFT version 6.32

About these products.

Get another burst.

Add time-sliced spectrum.

The spectral fits assume a redshift: 3.626 (GCN 6651)

Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 98 to 12683 s)

Download spectral files for Time-averaged spectrum.

Plots to download

WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+251 s

N_H (Galactic)	2.56 × 10²⁰ cm^-2
N_H (intrinsic)	6 (+7, -6) × 10²¹ cm^-2
z of absorber	3.626
Photon index	1.41 (+0.07, -0.07)
Flux (0.3-10 keV) (Observed)	5.17 (+0.29, -0.28) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	5.40 (+0.26, -0.25) × 10^-10 erg cm^-2 s^-1
Counts to flux (obs)	4.41 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.61 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	538.29 (591)
Spectrum exposure	264 s

PC mode. Mean photon arrival: T0+5312 s

N_H (Galactic)	2.56 × 10²⁰ cm^-2
N_H (intrinsic)	1.1 (+0.9, -0.8) × 10²² cm^-2
z of absorber	3.626
Photon index	1.46 (+0.08, -0.08)
Flux (0.3-10 keV) (Observed)	2.15 (+0.14, -0.13) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.28 (+0.13, -0.12) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	4.41 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.66 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	395.44 (472)
Spectrum exposure	5.8 ks

Late Time spectrum (T0 + 4267 to 12683 s)

Download spectral files for Late Time spectrum.

Plots to download

PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+7366 s

N_H (Galactic)	2.56 × 10²⁰ cm^-2
N_H (intrinsic)	1.31 (+1.08, -0.99) × 10²² cm^-2
z of absorber	3.626
Photon index	1.56 (+0.10, -0.10)
Flux (0.3-10 keV) (Observed)	1.19 (+0.10, -0.09) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.28 (+0.09, -0.08) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	4.16 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.47 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	342.51 (396)
Spectrum exposure	5.2 ks