GRB 251222A: Swift observation summary

Mission:	SVOM/ECLAIRs
GRB RA:	77.202°
GRB Dec:	-7.206°
GRB Err:	30 arcsec
T0:	2025-12-22 17:05:46 UT
Galactic:	207.55° -26.07°
Galactic N_H:	6.29× 10²⁰ cm^-2
Galactic E(B-V):	0.1339128

Sun distance:	146.60°
Sun angle:	11.09 [hr](East of Sun)
Moon distance:	125.66°
Visibility of this field.

Data analysed so far:

ObsID: 00021895001 with 2.0 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]	05h 08m 46.80s77.19502°	-07° 12′ 48.7″-7.21354°	2.5′′	Good	0.6′	2.0 ks	The source is 3.9-σ above the RASS limit.
Mean XRT rate: 0.186 (±0.014) ct s^-1 Peak XRT rate: 0.29 (±0.07) ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 6.6 (±0.5) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 1.04 (±0.23) ×10^-11 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 2 sources have been found in the XRT data. 0 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from SVOM/ECLAIRs pos	Exposure	Notes
1 [details]	05h 08m 46.80s77.19502°	-07° 12′ 48.7″-7.21354°	2.5′′	Good	0.6′	2.0 ks	The source is 3.9-σ above the RASS limit.
Mean XRT rate: 0.186 (±0.014) ct s^-1 Peak XRT rate: 0.29 (±0.07) ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 6.6 (±0.5) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 1.04 (±0.23) ×10^-11 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
2 [details]	05h 08m 58.04s77.24184°	-07° 13′ 57.0″-7.23251°	5.8′′	Good	2.9′	2.0 ks
Mean XRT rate: 6.4 (+2.6, -2.1) ×10^-3 ct s^-1 Peak XRT rate: 6.4 (+2.6, -2.1) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.4 (+0.6, -0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.4 (+0.6, -0.5) ×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.