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Einstein Probe trigger EP250109a / GRB 250109A
Source 4 (SWIFT J055522.6-122145)

Image of the XRT detection

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

Image of the LC

Spectrum

Image of the spectrum
Source details
Rank/Classification: 3: Uncatalogued X-ray source
RA (J2000):05h 55m 22.67s (= 88.84446°)
Dec (J2000):-12° 21′ 45.0″ (= -12.3625°)
Error (radius, 90%):7.1″
Detection flag:Good
XRT exposure:4.1 ks (vignetting corrected)
Peak rate:2.35 (+1.19, -0.90) ×10-3 ct s-1
Peak flux:1.0 (+0.5, -0.4) ×10-13 erg cm-2 s-1
Mean rate:2.35 (+1.19, -0.90) ×10-3 ct s-1
Mean flux:1.0 (+0.5, -0.4) ×10-13 erg cm-2 s-1
Has spectral fit?Yes
NH 3.25 × 1022 cm-2
Γ 2.23
Database ID:264
Things to check:
Optical Loading: No warning (automatic)
Stray Light: No warning (automatic)
Extended Emission: No warning (automatic)
Catalogue information
Known X-ray emitter?No. Get XMM upper limit
Rass upper limit20.015 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 - TYC 5356-516-1 is 10.1″ away.
High proper motion star?No.
Catalogue SearchCone search radius 21″ 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