GRB 250103A: Swift observation summary

Mission:	SVOM/ECLAIRs
GRB RA:	22.083°
GRB Dec:	-5.096°
GRB Err:	4.6 arcmin
T0:	2025-01-03 09:56:34 UT
Galactic:	146.31° -66.28°
Galactic N_H:	3.97× 10²⁰ cm^-2
Galactic E(B-V):	0.04008137

Sun distance:	95.39°
Sun angle:	6.53 [hr](East of Sun)
Moon distance:	52.37°
Visibility of this field.

Data analysed so far:

ObsID: 00021752001 with 2.7 ks exposure.
ObsID: 00021752002 with 1.1 ks exposure.

Source 1 has been manually confirmed as the GRB afterglow; data for this object are now available through the main GRB results area for this GRB.

About ToO analysis.

Probable afterglow details

A source was found which matches the afterglow criteria.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from SVOM/ECLAIRs pos	Exposure	Notes	Vizier
1 [details]	01h 28m 15.40s22.06415°	-05° 03′ 06.4″-5.05179°	2.5′′	Good	2.9′	7.1 ks	The source is fading with 4.1-σ significance.
Mean XRT rate: 5.3 (±0.3) ×10^-2 ct s^-1 Peak XRT rate: 0.138 (±0.030) ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.72 (±0.10) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 4.5 (±1.0) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| 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 2SXPS 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.

Find an upper limit.

Sources found so far

So far 4 sources have been found in the XRT data. 2 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from SVOM/ECLAIRs pos	Exposure	Notes
1 [details]	01h 28m 15.40s22.06415°	-05° 03′ 06.4″-5.05179°	2.5′′	Good	2.9′	7.1 ks	The source is fading with 4.1-σ significance.
Mean XRT rate: 5.3 (±0.3) ×10^-2 ct s^-1 Peak XRT rate: 0.138 (±0.030) ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.72 (±0.10) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 4.5 (±1.0) ×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 28m 33.26s22.13860°	-05° 06′ 47.2″-5.11311°	6.4′′	Poor	3.5′	7.1 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) Mean XRT flux: undetermined erg cm^-1s^-1 Peak XRT flux: undetermined erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
3 [details]	01h 28m 39.72s22.16548°	-05° 01′ 24.6″-5.02351°	6.7′′	Poor	6.6′	7.1 ks	Matches known X-ray source: 1WGA J0128.6-0501 (from ROSAT/WGACAT), 19.3″ away. Matches SIMBAD source: PB 8865, 5.7″ away.
Mean XRT rate: 3.12 (+1.02, -0.80) ×10^-3 ct s^-1 Peak XRT rate: 3.7 (+1.6, -1.3) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 9.9 (+3.2, -2.5) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 1.2 (+0.5, -0.4) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
4 [details]	01h 27m 48.73s21.95302°	-05° 07′ 30.2″-5.12505°	6.4′′	Poor	8.0′	7.1 ks	Matches SIMBAD source: SDSS J012748.60-050725.4, 5″ away.
Mean XRT rate: 2.11 (+1.16, -0.88) ×10^-3 ct s^-1 Peak XRT rate: 2.11 (+1.16, -0.88) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 7.38 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 4.6 (+2.5, -1.9) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 4.6 (+2.5, -1.9) ×10^-11 erg cm^-1s^-1 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.

Image

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FITS image.

Exposure map

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FITS exposure map.