GRB 250107A: Swift observation summary

Mission:	Swift/BAT
GRB RA:	302.520°
GRB Dec:	+45.564°
GRB Err:	4.0 arcmin
T0:	2025-01-07 05:02:30 UT
Galactic:	81.34° +6.66°
Galactic N_H:	5.38× 10²¹ cm^-2
Galactic E(B-V):	0.977078

Sun distance:	69.18°
Sun angle:	0.94 [hr] (East of Sun)
Moon distance:	72.88°
Visibility of this field.

Data analysed so far:

ObsID: 00021754001 with 4.7 ks exposure.

About ToO analysis.

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Sources found so far

So far 4 sources have been found in the XRT data. 1 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from Swift/BAT pos	Exposure	Notes
1 [details]	20h 09m 32.68s302.38617°	+45° 29′ 27.1″45.49086°	5.8′′	Good	7.1′	4.7 ks
Mean XRT rate: 2.97 (+1.19, -0.96) ×10^-3 ct s^-1 Peak XRT rate: 2.97 (+1.19, -0.96) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 2035527959.89 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 5.2 (+2.1, -1.7) ×10^-10 erg cm^-1s^-1 Peak XRT flux: 5.2 (+2.1, -1.7) ×10^-10 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=6.66°
2 [details]	20h 10m 27.73s302.61555°	+45° 28′ 37.0″45.47695°	5.5′′	Good	6.6′	4.7 ks	This source is affected by optical loading. Matches SIMBAD source: HD 191942, 3.7″ away.
Mean XRT rate: 2.84 (+1.13, -0.91) ×10^-3 ct s^-1 Peak XRT rate: 2.84 (+1.13, -0.91) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 5.3 (+2.1, -1.7) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 5.3 (+2.1, -1.7) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=6.66°
3 [details]	20h 09m 59.82s302.49926°	+45° 26′ 31.7″45.44215°	5.5′′	Good	7.4′	4.7 ks
Mean XRT rate: 1.7 (+1.0, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 1.7 (+1.0, -0.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.8 (+2.1, -1.6) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 3.8 (+2.1, -1.6) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=6.66°
4 [details]	20h 10m 17.30s302.57210°	+45° 41′ 46.9″45.69635°	5.8′′	Poor	8.2′	4.7 ks
Mean XRT rate: 1.7 (+1.0, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 1.7 (+1.0, -0.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=6.66°

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 image.

Exposure map

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FITS exposure map.