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Home > SVOM follow up > GRB 250901A

SVOM_FIELD00033

SVOM

33

/SVOM

GRB 250901A: Swift observation summary

This is a confirmed GRB (GRB 250901A), the afterglow is source 1 -- please see the GRB results at https://www.swift.ac.uk/xrt_products/03000066 for updated analysis

Data analysed so far:

• ObsID: 03000066001 with 0.8 ks exposure.

About tiled field analysis.

So far 1 fields have been scheduled for observations. Data are available and processed for 1 of these.

• 3000066 — 754 s of cleaned data taken between 2025-09-01 18:52:43 and 2025-09-01 19:10:04

Details of afterglow candidates

1 sources were found which matches the afterglow criteria.

#	RA (J2000)	Dec (J2000)	Err901	Detection Flag2	Rank3	Dist from SVOM/ECLAIRs pos	Exposure	Notes	Vizier
1 [details]	23h 44m 44.08s356.18367°	-15° 44′ 27.7″-15.74103°	3.9′′	Good	1 (T)	6.6′	754 s	The source is 4.4-σ above the LSPXS limit.
Mean XRT rate: 0.157 (±0.017) ct s-1 Peak XRT rate: 0.24 (±0.05) ct s-1 RASS PSPC 3-σ upper limit: 0.06 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.208 (±0.022) ct s-1 Peak XRT rate converted to PSPC: 0.32 (±0.07) ct s-1 Mean XRT flux: 5.2 (±0.5) ×10-12 erg cm-1s-1 Peak XRT flux: 7.9 (±1.8) ×10-12 erg cm-1s-1 Products: Light curve | Spectrum

¹ Radius, 90% confidence.
² Indicates how likely the source is to be real. See the LSXPS documentation.
³ T=Transient Source, O=Outbursting known source, U=Uncatalogued X-ray source, K=Known X-ray source.
^* The position was enhanced using astrometry derived from the Swift UVOT.
^† The position was astrometrically corrected using the XRT sources and the 2MASS catalogue.

Find an upper limit.

Sources found so far

So far 2 sources have been found in the XRT data. 1 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err901	Detection Flag2	Rank3	Dist from SVOM/ECLAIRs pos	Exposure	Notes	Vizier
1 [details]	23h 44m 44.08s356.18367°	-15° 44′ 27.7″-15.74103°	3.9′′	Good	1 (T)	6.6′	754 s	The source is 4.4-σ above the LSPXS limit.
Mean XRT rate: 0.157 (±0.017) ct s-1 Peak XRT rate: 0.24 (±0.05) ct s-1 RASS PSPC 3-σ upper limit: 0.06 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.208 (±0.022) ct s-1 Peak XRT rate converted to PSPC: 0.32 (±0.07) ct s-1 Mean XRT flux: 5.2 (±0.5) ×10-12 erg cm-1s-1 Peak XRT flux: 7.9 (±1.8) ×10-12 erg cm-1s-1 Products: Light curve | Spectrum
2 [details]	23h 44m 28.83s356.12011°	-15° 47′ 14.3″-15.78730°	5.1′′	Good	4 (K)	7.1′	754 s	Matches known X-ray source: LSXPS J234428.9-154717 (from LSXPS), 3.6″ away.
Mean XRT rate: 1.2 (+0.6, -0.4) ×10-2 ct s-1 Peak XRT rate: 1.2 (+0.6, -0.4) ×10-2 ct s-1 1.43 σ below the catalogued flux from LSXPS. RASS PSPC 3-σ upper limit: 0.0×100 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.020 (+0.009, -0.007) ct s-1 Peak XRT rate converted to PSPC: 0.020 (+0.009, -0.007) ×10-2 ct s-1 Mean XRT flux: 4.8 (+2.2, -1.7) ×10-13 erg cm-1s-1 Peak XRT flux: 4.8 (+2.2, -1.7) ×10-13 erg cm-1s-1 Products: Light curve | Spectrum

¹ Radius, 90% confidence.
² Indicates how likely the source is to be real. See the LSXPS documentation.
³ T=Transient Source, O=Outbursting known source, U=Uncatalogued X-ray source, K=Known X-ray source.
^* The position was enhanced using astrometry derived from the Swift UVOT.
^† The position was astrometrically corrected using the XRT sources and the 2MASS catalogue.

Image

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FITS image.

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Exposure map

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FITS exposure map.