Skip banner and navigation tools.

 |  site map

SVOM trigger GRB 250831A
Source 1 (SWIFT J013907.0-175644)

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: 1: Transient source
RA (J2000):01h 39m 07.42s (= 24.78090°)
Dec (J2000):-17° 56′ 46.5″ (= -17.9462°)
Error (radius, 90%):2.2″ (enhanced position)
Detection flag:Good
XRT exposure:1559 s (vignetting corrected)
Peak rate:8.4 (±1.8) ct s-1
Peak flux:3.6 (±0.8) ×10-10 erg cm-2 s-1
Mean rate:5.44 (±0.16) ct s-1
Mean flux:2.34 (±0.07) ×10-10 erg cm-2 s-1
The source is fading with 2.5-σ significance
Has spectral fit?Yes
NH 1.30 × 1021 cm-2
Γ 2.42
Database ID:388
Things to check:
Optical Loading: No warning (automatic)
Stray Light: No warning (automatic)
Extended Emission: Needs checking (automatic)
Catalogue information
Known X-ray emitter?No. Get XMM upper limit
LSXPS upper limit6.6×10-3 ct s-1
Obs rate/LSXPS UL4.6 σ
Rass upper limit20.32 ct s-1
Obs rate/Rass UL4.4 σ
Fading? ≤3-σ signifance.
Near 2MASS source? No
Near SIMBAD source?No.
High proper motion star?No.
Catalogue SearchCone search radius 6″ 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.