The Neil Gehrels Swift Observatory

General Information:

Swift Name:SWIFT J1209.4+4340
RA:182.3881 (J2000)
Dec:43.6800 (J2000)
S/N:16.70
Counterpart Name:NGC 4138
Ctpt RA:182.3741 (J2000)
Ctpt Dec:43.6853 (J2000)
Flux:23.29 (20.87, 25.81) × 10-12 ergs s-1 cm-2, (14-195 keV)
Gamma:1.90 (1.76, 2.05)
Chi2r:0.37
Redshift:0.0030
Luminosity:41.68 log[ergs s-1] (14-195 keV)
AS:1
Class:5
Type:Sy2

BAT 157-Month Lightcurve:

Crab Weighted Monthly Mosaic Lightcurve for SWIFT J1209.4+4340

Crab Weighted Monthly Mosaic Lightcurve for SWIFT J1209.4+4340

Lightcurve:

BAT 157-Month Spectrum:

BAT Spectrum for SWIFT J1209.4+4340

BAT Spectrum for SWIFT J1209.4+4340

BAT Hard X-ray Transient Source Page:

Data last modified: 15 Sep 2025
Page last modified: 03 Jun 2025