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Einstein Probe trigger EP250321a
Source 3 (SWIFT J115742.4+172803)

Image of the XRT detection

This source is detected in 1 block. Show all images.

Image of the LC

Spectrum

Image of the spectrum

Enhanced position

Image of the UVOT image
Source details
Rank/Classification: 3: Uncatalogued X-ray source
RA (J2000):11h 57m 42.05s (= 179.42522°)
Dec (J2000):+17° 28′ 06.1″ (= +17.4684°)
Error (radius, 90%):4.0″ (enhanced position)
Detection flag:Good
XRT exposure:9.7 ks (vignetting corrected)
Peak rate:9.8 (±2.6) ×10-3 ct s-1
Peak flux:4.2 (±1.1) ×10-13 erg cm-2 s-1
Mean rate:7.0 (+1.3, -1.2) ×10-3 ct s-1
Mean flux:3.0 (±0.5) ×10-13 erg cm-2 s-1
Has spectral fit?Yes
NH 2.25 × 1021 cm-2
Γ 5.68
Database ID:337
Things to check:
Optical Loading: Needs checking (automatic)
Stray Light: No warning (automatic)
Extended Emission: No warning (automatic)
Catalogue information
Known X-ray emitter?No. Get XMM upper limit
LSXPS upper limit9.1×10-3 ct s-1
Obs rate/LSXPS UL≤0 σ
Rass upper limit20.053 ct s-1
Obs rate/Rass UL≤0 σ
Fading? ≤3-σ signifance.
Near 2MASS source? Yes, 1 match. Show details.
Near SIMBAD source?Yes - HD 103877 is 1.5″ away.
High proper motion star?No.
Catalogue SearchCone search radius 12″ Vizier | Simbad | NED | X-ray master | LSXPS | 3XMM-DR5

Notes
All XRT count rates and fluxes are 0.3—10 keV
1Catalogued count-rates have been converted to XRT equivalents.
2Catalogued upper limits and fluxes have been converted to the XRT equivalent using the automatic power-law spectral fit described above.

2MASS objects near the source

ID Position Offset from
XRT source		 J H K