Swift BAT 157-Month Hard X-ray Survey » SWIFT J1657.7+3518

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General Information:

Swift Name:	SWIFT J1657.7+3518
RA:	254.4577 (J2000)
Dec:	35.3419 (J2000)
S/N:	793.81
Counterpart Name:	Her X-1
Ctpt RA:	254.4576 (J2000)
Ctpt Dec:	35.3424 (J2000)
Flux:	958.91 (957.13, 960.62) × 10^-12 ergs s^-1 cm^-2, (14-195 keV)
Gamma:	3.26 (3.26, 3.27)
Chi²_{r_:}	10838.45
Redshift:	NA
Luminosity:	NA log[ergs s^-1] (14-195 keV)
AS:	1
Class:	14
Type:	LMXB

SIMBAD
NED

BAT 157-Month Lightcurve:

Crab Weighted Monthly Mosaic Lightcurve for SWIFT J1657.7+3518

Crab Weighted Monthly Mosaic Lightcurve for SWIFT J1657.7+3518

Lightcurve:

BAT 157-Month Spectrum:

BAT Spectrum for SWIFT J1657.7+3518

BAT Spectrum for SWIFT J1657.7+3518

SWIFT_J1657.7+3518.pha

BAT Hard X-ray Transient Source Page:

http://swift.gsfc.nasa.gov/docs/swift/results/transients/HerX-1/

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