GRB 250108A: Swift observation summary

Mission:	SVOM/ECLAIRs
GRB RA:	207.906°
GRB Dec:	+26.232°
GRB Err:	60 arcsec
T0:	2025-01-08 04:37:01 UT
Galactic:	32.53° +76.53°
Galactic N_H:	1.30× 10²⁰ cm^-2
Galactic E(B-V):	0.01286278

Sun distance:	92.46°
Sun angle:	5.43 [hr](West of Sun)
Moon distance:	138.43°
Visibility of this field.

Data analysed so far:

ObsID: 00021755001 with 2.7 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]	13h 51m 41.02s207.92093°	+26° 12′ 59.5″26.21652°	4.1′′	Good	1.2′	2.7 ks	The source is 3.9-σ above the 2SXPS limit.
Mean XRT rate: 1.7 (±0.3) ×10^-2 ct s^-1 Peak XRT rate: 2.0 (±0.5) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.8 (+0.8, -0.7) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 4.7 (±1.1) ×10^-13 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 6 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]	13h 51m 41.02s207.92093°	+26° 12′ 59.5″26.21652°	4.1′′	Good	1.2′	2.7 ks	The source is 3.9-σ above the 2SXPS limit.
Mean XRT rate: 1.7 (±0.3) ×10^-2 ct s^-1 Peak XRT rate: 2.0 (±0.5) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.8 (+0.8, -0.7) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 4.7 (±1.1) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
2 [details]	13h 51m 19.28s207.83033°	+26° 15′ 20.2″26.25560°	6.7′′	Good	4.3′	2.7 ks	Matches known X-ray source: 2SXPS J135119.3+261521 (from 2SXPS), 2.5″ away. Matches SIMBAD source: SDSS J135119.37+261521.6, 2.3″ away.
Mean XRT rate: 8.9 (+3.1, -2.6) ×10^-3 ct s^-1 Peak XRT rate: 8.9 (+3.1, -2.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.4 (+0.9, -0.7) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.4 (+0.9, -0.7) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
3 [details]	13h 52m 32.72s208.13633°	+26° 16′ 46.6″26.27962°	15.1′′	Poor	12.7′	1.4 ks
Mean XRT rate: 5.2 (+3.4, -2.4) ×10^-3 ct s^-1 Peak XRT rate: 5.2 (+3.4, -2.4) ×10^-3 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?]
4 [details]	13h 50m 59.57s207.74822°	+26° 09′ 55.8″26.16551°	6.2′′	Poor	9.4′	2.7 ks
Mean XRT rate: 3.8 (+2.1, -1.7) ×10^-3 ct s^-1 Peak XRT rate: 3.8 (+2.1, -1.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Products: Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
5 [details]	13h 50m 50.79s207.71163°	+26° 12′ 08.4″26.20232°	8.5′′	Poor	10.6′	2.7 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 11.35 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 \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
6 [details]	13h 51m 31.31s207.88047°	+26° 18′ 13.3″26.30369°	8.2′′	Good	4.5′	2.7 ks	Matches known X-ray source: 2SXPS J135131.6+261807 (from 2SXPS), 7.6″ away.
Mean XRT rate: 4.5 (+2.0, -1.6) ×10^-3 ct s^-1 Peak XRT rate: 4.5 (+2.0, -1.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 6.9 (+3.0, -2.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 6.9 (+3.0, -2.5) ×10^-13 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.