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Einstein Probe trigger EP250427a / GRB 250427A
Source 1 (SWIFT J182905.4+073347)

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):18h 29m 05.47s (= 277.27280°)
Dec (J2000):+07° 33′ 47.6″ (= +7.5632°)
Error (radius, 90%):3.9″
Detection flag:Good
XRT exposure:1652 s (vignetting corrected)
Peak rate:0.098 (±0.026) ct s-1
Peak flux:4.2 (±1.1) ×10-12 erg cm-2 s-1
Mean rate:0.069 (+0.009, -0.008) ct s-1
Mean flux:3.0 (±0.4) ×10-12 erg cm-2 s-1
The source is fading with 1.2-σ significance
Has spectral fit?Yes
NH 2.87 × 1021 cm-2
Γ 1.79
Database ID:366
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 limit20.049 ct s-1
Obs rate/Rass UL1.9 σ
Fading? ≤3-σ signifance.
Near 2MASS source? Yes, 1 match. Show details.
Near SIMBAD source?No.
High proper motion star?No.
Catalogue SearchCone search radius 11″ 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