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Home > SVOM follow up > GRB 250403A

SVOM_FIELD00010

SVOM

10

/SVOM

GRB 250403A: Swift observation summary

This is a confirmed GRB (GRB 250403A), the afterglow is source 1 -- please see the GRB results at https://www.swift.ac.uk/xrt_products/00019677 for updated analysis

Data analysed so far:

• ObsID: 00019677001 with 0.4 ks exposure.

About tiled field analysis.

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

• 19677 — 401 s of cleaned data taken between 2025-04-03 15:45:41 and 2025-04-03 17:29:00

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]	12h 58m 27.90s194.61625°	-24° 22′ 47.9″-24.37996°	3.7′′ *	Good	2 (O)	1.3′	401 s	The source is 3.1-σ above the RASS limit.
Mean XRT rate: 0.213 (±0.029) ct s-1 Peak XRT rate: 0.29 (±0.07) ct s-1 RASS PSPC 3-σ upper limit: 0.06 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.31 (±0.04) ct s-1 Peak XRT rate converted to PSPC: 0.42 (±0.11) ct s-1 Mean XRT flux: 6.3 (±0.9) ×10-12 erg cm-1s-1 Peak XRT flux: 8.6 (±2.2) ×10-12 erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position

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 16 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]	12h 58m 27.90s194.61625°	-24° 22′ 47.9″-24.37996°	3.7′′ *	Good	2 (O)	1.3′	401 s	The source is 3.1-σ above the RASS limit.
Mean XRT rate: 0.213 (±0.029) ct s-1 Peak XRT rate: 0.29 (±0.07) ct s-1 RASS PSPC 3-σ upper limit: 0.06 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.31 (±0.04) ct s-1 Peak XRT rate converted to PSPC: 0.42 (±0.11) ct s-1 Mean XRT flux: 6.3 (±0.9) ×10-12 erg cm-1s-1 Peak XRT flux: 8.6 (±2.2) ×10-12 erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position
2 [details]	12h 59m 04.33s194.76804°	-24° 16′ 03.1″-24.26751°	12.6′′	Poor	3 (U)	11.6′	401 s
Mean XRT rate: 8.5 (±2.3) ×10-2 ct s-1 Peak XRT rate: 8.5 (±2.3) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.04 ct s-1 (PSPC count-rate) Products: Light curve
3 [details]	12h 58m 58.85s194.74522°	-24° 16′ 48.3″-24.28008°	5.7′′	Poor	3 (U)	10.1′	401 s
Mean XRT rate: 5.2 (±1.9) ×10-2 ct s-1 Peak XRT rate: 5.2 (±1.9) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 2.5×10-4 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 22 (±8) ct s-1 Peak XRT rate converted to PSPC: 22 (±8) ×101 ct s-1 Mean XRT flux: 10 (±3) ×10-13 erg cm-1s-1 Peak XRT flux: 10 (±3) ×10-13 erg cm-1s-1 Products: Light curve | Spectrum
4 [details]	12h 57m 49.09s194.45454°	-24° 20′ 07.3″-24.33536°	5.8′′	Poor	3 (U)	8.0′	401 s
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.05 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: undetermined ct s-1 Peak XRT rate converted to PSPC: undetermined ct s-1 Mean XRT flux: undetermined erg cm-1s-1 Peak XRT flux: undetermined erg cm-1s-1 Products: Light curve | Spectrum
5 [details]	12h 57m 56.25s194.48437°	-24° 18′ 43.2″-24.31199°	6.0′′	Poor	3 (U)	7.1′	401 s
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.0×100 ct s-1 (PSPC count-rate) Mean XRT flux: undetermined erg cm-1s-1 Peak XRT flux: undetermined erg cm-1s-1 Products: Light curve | Spectrum
6 [details]	12h 58m 22.65s194.59437°	-24° 13′ 03.2″-24.21756°	4.9′′ *	Poor	3 (U)	9.5′	401 s	Matches SIMBAD source: 2MASS J12582224-2412462, 15.2″ away.
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.11 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: undetermined ct s-1 Peak XRT rate converted to PSPC: undetermined ct s-1 Mean XRT flux: undetermined erg cm-1s-1 Peak XRT flux: undetermined erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position
7 [details]	12h 59m 02.92s194.76217°	-24° 28′ 54.5″-24.48181°	5.5′′	Poor	3 (U)	11.2′	401 s
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.0×100 ct s-1 (PSPC count-rate) Mean XRT flux: undetermined erg cm-1s-1 Peak XRT flux: undetermined erg cm-1s-1 Products: Light curve | Spectrum
8 [details]	12h 57m 51.37s194.46406°	-24° 17′ 25.6″-24.29044°	5.2′′ *	Poor	3 (U)	8.7′	401 s
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.0×100 ct s-1 (PSPC count-rate) Mean XRT flux: undetermined erg cm-1s-1 Peak XRT flux: undetermined erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position
9 [details]	12h 58m 27.11s194.61294°	-24° 28′ 40.7″-24.47796°	4.9′′ *	Poor	3 (U)	6.2′	401 s
Mean XRT rate: 3.1 (+1.5, -1.2) ×10-2 ct s-1 Peak XRT rate: 3.1 (+1.5, -1.2) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.05 ct s-1 (PSPC count-rate) Products: Light curve | Enhanced position
10 [details]	12h 58m 03.25s194.51355°	-24° 16′ 13.0″-24.27028°	6.4′′	Poor	3 (U)	7.7′	401 s
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.05 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: undetermined ct s-1 Peak XRT rate converted to PSPC: undetermined ct s-1 Mean XRT flux: undetermined erg cm-1s-1 Peak XRT flux: undetermined erg cm-1s-1 Products: Light curve | Spectrum
11 [details]	12h 57m 52.53s194.46888°	-24° 26′ 14.5″-24.43736°	6.3′′	Poor	3 (U)	7.7′	401 s
Mean XRT rate: 3.2 (+1.5, -1.2) ×10-2 ct s-1 Peak XRT rate: 3.2 (+1.5, -1.2) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.11 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.0216 (+0.0102, -0.0085) ct s-1 Peak XRT rate converted to PSPC: 0.0216 (+0.0102, -0.0085) ×10-2 ct s-1 Mean XRT flux: 2.25 (+1.07, -0.89) ×10-10 erg cm-1s-1 Peak XRT flux: 2.25 (+1.07, -0.89) ×10-10 erg cm-1s-1 Products: Light curve | Spectrum
12 [details]	12h 58m 18.80s194.57835°	-24° 22′ 47.5″-24.37986°	3.9′′ *	Poor	3 (U)	0.8′	401 s
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 4280034774.86 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: undetermined ct s-1 Peak XRT rate converted to PSPC: undetermined ct s-1 Mean XRT flux: undetermined erg cm-1s-1 Peak XRT flux: undetermined erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position
13 [details]	12h 58m 18.57s194.57737°	-24° 13′ 24.5″-24.22346°	4.5′′ *	Poor	3 (U)	9.2′	401 s
Mean XRT rate: 3.8 (+1.8, -1.5) ×10-2 ct s-1 Peak XRT rate: 3.8 (+1.8, -1.5) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.05 ct s-1 (PSPC count-rate) Products: Light curve | Enhanced position
14 [details]	12h 58m 46.03s194.69179°	-24° 12′ 09.9″-24.20275°	5.3′′	Poor	4 ()	11.7′	0 s
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.0×100 ct s-1 (PSPC count-rate) Products: Light curve | Spectrum
15 [details]	12h 57m 44.82s194.43674°	-24° 25′ 09.6″-24.41934°	5.2′′ *	Poor	3 (U)	8.9′	401 s
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 1.0×10-4 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: undetermined ct s-1 Peak XRT rate converted to PSPC: undetermined ct s-1 Mean XRT flux: undetermined erg cm-1s-1 Peak XRT flux: undetermined erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position
16 [details]	12h 58m 39.59s194.66495°	-24° 22′ 08.6″-24.36906°	5.9′′ *	Poor	3 (U)	4.0′	401 s
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.04 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: undetermined ct s-1 Peak XRT rate converted to PSPC: undetermined ct s-1 Mean XRT flux: undetermined erg cm-1s-1 Peak XRT flux: undetermined erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position

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.

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FITS exposure map.