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### Absolute flux

G21.5-09

source region – circle radius 2.7 arcmin

Best fit po x phabs model: = 1.86 ± 0.04

Nh = 1.91 ± 0.04 x 1022 cm-2

Flux(2-10 keV) = 5.1 x 10-11 ergs cm-2 s-1

Ginga: = 1.88, Nh = 1.3 x 1022 cm-2

Flux(2-10 keV) = 5.2 x 10-11 ergs cm-2 s-1

EXOSAT: = 1.59-1.84,

Nh = 1.08 – 1.83 x 1022 cm-2

Flux(2-10 keV) = 6.5 x 10-11 ergs cm-2 s-1

Cross-correlation with pn data

Best fit po x phabs model: = 2.06 ± 0.03

Nh = 2.08 ± 0.04 x 1022 cm-2

Flux(2-10 keV) = 7.6 x 10-11 ergs cm-2 s-1

(flux 50% greater)

Light curve shows 30 ks available but calculated exposure = 10 ks?

source region – circle radius 34''

Best fit (2-10 keV) po x phabs model:MOS1 = 2.50 ± 0.07

Flux(2-10 keV) = 3.1 x 10-12 ergs cm-2 s-1

PN = 2.62 ± 0.05

Flux(2-10 keV) = 3.2 x 10-12 ergs cm-2 s-1

2-10 keV flux agrees to within 3%

MOS Flux(0.2-2.0 keV) = 6.0x 10-12 ergs cm-2 s-1

PN Flux(0.2-2.0 keV) = 7.0 x 10-12 ergs cm-2 s-1

(17% difference)

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