Swift BAT 157-Month Hard X-ray Survey » SWIFT J1557.8-5425

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General Information:

Swift Name:	SWIFT J1557.8-5425
RA:	239.4972 (J2000)
Dec:	-54.4063 (J2000)
S/N:	17.95
Counterpart Name:	H 1553-542
Ctpt RA:	239.4512 (J2000)
Ctpt Dec:	-54.4150 (J2000)
Flux:	22.14 (20.56, 23.77) × 10^-12 ergs s^-1 cm^-2, (14-195 keV)
Gamma:	4.00 (3.77, 4.25)
Chi²_{r_:}	3.24
Redshift:	NA
Luminosity:	NA log[ergs s^-1] (14-195 keV)
AS:	1
Class:	13
Type:	HMXB

SIMBAD
NED

BAT 157-Month Lightcurve:

Crab Weighted Monthly Mosaic Lightcurve for SWIFT J1557.8-5425

Crab Weighted Monthly Mosaic Lightcurve for SWIFT J1557.8-5425

Lightcurve:

BAT 157-Month Spectrum:

BAT Spectrum for SWIFT J1557.8-5425

BAT Spectrum for SWIFT J1557.8-5425

SWIFT_J1557.8-5425.pha

BAT Hard X-ray Transient Source Page:

http://swift.gsfc.nasa.gov/docs/swift/results/transients/weak/H1553-542/

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