GRB 260102A: Swift observation summary

Mission:	SVOM/ECLAIRs
GRB RA:	183.880°
GRB Dec:	+48.258°
GRB Err:	5.1 arcmin
T0:	2026-01-02 04:10:03 UT
Galactic:	138.86° +67.74°
Galactic N_H:	1.68× 10²⁰ cm^-2
Galactic E(B-V):	0.01814427

Sun distance:	112.44°
Sun angle:	6.57 [hr](West of Sun)
Moon distance:	75.86°
Visibility of this field.

Data analysed so far:

ObsID: 00021896001 with 2.8 ks exposure.

Source 2 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
2 [details]	12h 15m 47.82s183.94925°	+48° 15′ 02.1″48.25058°	6.2′′	Good	2.8′	7.3 ks	The source is fading with 3.1-σ significance.
Mean XRT rate: 6.3 (+2.2, -1.8) ×10^-3 ct s^-1 Peak XRT rate: 6.3 (+2.2, -1.8) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 1286.38 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 \| 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 3 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]	12h 14m 29.96s183.62485°	+48° 18′ 51.7″48.31437°	5.8′′	Good	10.7′	4.4 ks	Matches known X-ray source: XMMSL3 J121430.4+481857 (from XMM-NEWTON/XMMSLEWCLN), 10″ away. Matches SIMBAD source: BD+49 2125, 8.3″ away.
Mean XRT rate: 1.73 (±0.26) ×10^-2 ct s^-1 Peak XRT rate: 2.3 (±0.5) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.9 (±0.4) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 3.8 (±0.8) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
2 [details]	12h 15m 47.82s183.94925°	+48° 15′ 02.1″48.25058°	6.2′′	Good	2.8′	7.3 ks	The source is fading with 3.1-σ significance.
Mean XRT rate: 6.3 (+2.2, -1.8) ×10^-3 ct s^-1 Peak XRT rate: 6.3 (+2.2, -1.8) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 1286.38 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 \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
3 [details]	12h 14m 25.34s183.60558°	+48° 19′ 55.3″48.33204°	8.9′′	Poor	11.8′	3.5 ks	Matches SIMBAD source: 6C 121154+483739, 9.4″ away.
Mean XRT rate: 4.5 (+2.6, -1.9) ×10^-3 ct s^-1 Peak XRT rate: 4.5 (+2.6, -1.9) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.30 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.2 (+1.8, -1.3) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 3.2 (+1.8, -1.3) ×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.