GRB 250704A: Swift observation summary

This is a confirmed GRB (GRB 250704A), the afterglow is source 1 -- please see the GRB results at https://www.swift.ac.uk/xrt_products/00019907 for updated analysis

Mission:	SVOM/ECLAIRs
SVOM RA:	17.133°
SVOM Dec:	-17.280°
SVOM Err:	6.8 arcmin
T0:	2025-07-04 03:42:20 UT
Galactic:	145.66° -79.39°
Galactic N_H:	1.50× 10²⁰ cm^-2

Sun distance:	93.11°
Sun angle:	5.74 [hr](West of Sun)
Moon distance:	148.93°
Visibility of this field.
First slew:	2025-07-04 04:29:25 UT
First observation:	2025-07-04 04:28:54 UT
First analysis:	2025-07-04 06:26:20 UT

Data analysed so far:

ObsID: 00019907001 with 1.7 ks exposure.

About tiled field analysis.

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

19907 — 1.7 ks of cleaned data taken between 2025-07-04 04:29:23 and 2025-07-04 04:59:24

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]	01h 08m 46.48s17.19366°	-17° 19′ 27.0″-17.32417°	3.7′′	Good	2 (O)	4.4′	1.7 ks	The source is 4.1-σ above the RASS limit.
Mean XRT rate: 0.170 (±0.011) ct s^-1 Peak XRT rate: 0.38 (±0.08) ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.248 (±0.016) ct s^-1 Peak XRT rate converted to PSPC: 0.55 (±0.12) ct s^-1 Mean XRT flux: 5.1 (±0.3) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 1.13 (±0.25) ×10^-11 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 3 sources have been found in the XRT data. 2 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Rank³	Dist from SVOM/ECLAIRs pos	Exposure	Notes
1 [details]	01h 08m 46.48s17.19366°	-17° 19′ 27.0″-17.32417°	3.7′′	Good	2 (O)	4.4′	1.7 ks	The source is 4.1-σ above the RASS limit.
Mean XRT rate: 0.170 (±0.011) ct s^-1 Peak XRT rate: 0.38 (±0.08) ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.248 (±0.016) ct s^-1 Peak XRT rate converted to PSPC: 0.55 (±0.12) ct s^-1 Mean XRT flux: 5.1 (±0.3) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 1.13 (±0.25) ×10^-11 erg cm^-1s^-1 Products: Light curve \| Spectrum
2 [details]	01h 09m 21.65s17.34022°	-17° 21′ 05.9″-17.35165°	5.7′′	Good	4 (K)	12.6′	1.7 ks	Matches SIMBAD source: LEDA 884732, 2.9″ away. Matches known X-ray source: 1RXS J010921.4-172057 (from ROSAT/RASSBSC), 9.1694183232124″ away.
Mean XRT rate: 3.3 (±0.6) ×10^-2 ct s^-1 Peak XRT rate: 5.5 (±1.4) ×10^-2 ct s^-1 2.43 σ below the catalogued flux from ROSAT/RASSBSC. RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.072 (±0.013) ct s^-1 Peak XRT rate converted to PSPC: 0.12 (±0.03) ×10^-1 ct s^-1 Mean XRT flux: 8.8 (±1.6) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.5 (±0.4) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum
3 [details]	01h 07m 47.58s16.94824°	-17° 20′ 41.9″-17.34497°	9.1′′	Good	4 (K)	11.3′	1.7 ks	Matches SIMBAD source: GALEX J010747.4-172042, 1.6″ away. Matches known X-ray source: LSXPS J010747.3-172044 (from LSXPS), 3.9″ away.
Mean XRT rate: 7.7 (+3.4, -2.7) ×10^-3 ct s^-1 Peak XRT rate: 7.7 (+3.4, -2.7) ×10^-3 ct s^-1 1.28 σ below the catalogued flux from LSXPS. RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (PSPC count-rate) Products: Light curve

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FITS exposure map.