GRB 260903A: Swift observation summary

Mission:	SVOM/ECLAIRs
GRB RA:	25.661°
GRB Dec:	+11.370°
GRB Err:	0.4998 arcsec
T0:	2026-09-03 12:36:59 UT
Galactic:	142.49° -49.55°
Galactic N_H:	4.52× 10²⁰ cm^-2
Galactic E(B-V):	0.0633214

Sun distance:	132.75°
Sun angle:	9.10 [hr](West of Sun)
Moon distance:	32.48°
Visibility of this field.

Data analysed so far:

ObsID: 00021910001 with 3.9 ks exposure.

About ToO analysis.

Find an upper limit.

Sources found so far

So far 7 sources have been found in the XRT data. 5 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from SVOM/ECLAIRs pos	Exposure	Notes
1 [details]	01h 42m 30.96s25.62898°	+11° 12′ 59.1″11.21642°	2.7′′	Good	9.4′	3.9 ks	Matches known X-ray source: LSXPS J014231.0+111257 (from LSXPS), 7″ away. Matches SIMBAD source: SDSS J014231.00+111258.0, 6.4″ away.
Mean XRT rate: 5.1 (±0.5) ×10^-2 ct s^-1 Peak XRT rate: 7.8 (±2.0) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.97 (±0.19) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 3.0 (±0.8) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
2 [details]	01h 42m 15.69s25.56538°	+11° 11′ 37.4″11.19373°	9.5′′	Good	12.0′	1.9 ks	Matches known X-ray source: LSXPS J014215.7+111129 (from LSXPS), 8.1″ away.
Mean XRT rate: 6.8 (+3.1, -2.4) ×10^-3 ct s^-1 Peak XRT rate: 6.8 (+3.1, -2.4) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.2 (+1.0, -0.8) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.2 (+1.0, -0.8) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
3 [details]	01h 42m 02.09s25.50869°	+11° 24′ 36.2″11.41005°	4.6′′	Good	9.3′	3.9 ks	Matches SIMBAD source: SDSS J014202.17+112436.2, 6.4″ away.
Mean XRT rate: 7.6 (±1.9) ×10^-3 ct s^-1 Peak XRT rate: 7.6 (±1.9) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.3 (±0.3) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.3 (±0.3) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
4 [details]	01h 41m 57.78s25.49076°	+11° 18′ 23.7″11.30657°	5.2′′	Good	10.7′	3.9 ks	Matches known X-ray source: LSXPS J014158.2+111822 (from LSXPS), 7.2″ away.
Mean XRT rate: 8.9 (+2.7, -2.3) ×10^-3 ct s^-1 Peak XRT rate: 8.9 (+2.7, -2.3) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.49 (+1.07, -0.89) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 3.49 (+1.07, -0.89) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
5 [details]	01h 42m 46.44s25.69350°	+11° 17′ 12.2″11.28672°	7.9′′	Good	5.4′	3.9 ks
Mean XRT rate: 4.8 (+1.7, -1.4) ×10^-3 ct s^-1 Peak XRT rate: 4.8 (+1.7, -1.4) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.2 (+0.8, -0.6) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.2 (+0.8, -0.6) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
6 [details]	01h 42m 58.19s25.74244°	+11° 30′ 04.3″11.50120°	4.9′′	Good	9.2′	3.9 ks	Matches SIMBAD source: SDSS J014258.63+113002.4, 6.9″ away.
Mean XRT rate: 4.5 (+1.6, -1.3) ×10^-3 ct s^-1 Peak XRT rate: 4.5 (+1.6, -1.3) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.8 (+0.6, -0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.8 (+0.6, -0.5) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
7 [details]	01h 42m 52.21s25.71754°	+11° 23′ 03.2″11.38422°	6.3′′	Poor	3.4′	3.9 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]

¹ Radius, 90% confidence.
² Indicates how likely the source is to be real. See the 1SXPS documentation.
^* 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.