General information
NuSTAR 260828 is a 1100 s hard X-ray transient detected by NuSTAR on 2026-08-28 18:39:29.6 UTC at RA=91.9004 deg, Dec=-8.49441 deg with about 10 arcsec uncertainty. No catalogued X-ray source is reported at the position despite multiple Swift observations of the region.
Wavelength coverage
- X-ray: NuSTAR detected the transient in the 3--79 keV band and reported a power-law spectral fit plus flux estimates.
- X-ray: Swift is mentioned only in the context of prior observations showing no catalogued X-ray source at the NuSTAR position.
No observations mentioned: optical, infrared, radio, gamma-ray, neutrino, gravitational-wave.
Lightcurve and spectrum
- Duration: about 1100 s.
- Spectrum: power law with Gamma=1.7^+2.0_-1.9.
- Flux: 3--79 keV flux of 2.9 +/- 2.2 x10^-12 erg cm^-2 s^-1.
- Extrapolated flux: 0.2--10 keV flux of 1.1^+3.1_-0.9 x10^-12 erg cm^-2 s^-1.
Redshift
What’s special vs typical
- The event is a fast hard X-ray transient without a known catalogued X-ray counterpart at the reported position.
- Its nature is unclear; a flare star is explicitly stated as not ruled out because of the soft, unconstrained spectrum and location close to the Galactic plane.