GRB 250601A: Swift observation summary

Mission:	Swift/BAT
GRB RA:	90.071°
GRB Dec:	-57.289°
GRB Err:	5.0 arcmin
T0:	2025-06-01 17:29:35 UT
Galactic:	265.73° -29.35°
Galactic N_H:	5.12× 10²⁰ cm^-2
Galactic E(B-V):	0.06954069

Sun distance:	81.24°
Sun angle:	1.35 [hr] (East of Sun)
Moon distance:	87.05°
Visibility of this field.

Data analysed so far:

ObsID: 00021844001 with 4.6 ks exposure.
ObsID: 00021844002 with 3.9 ks exposure.

About ToO analysis.

Find an upper limit.

Sources found so far

So far 12 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]	06h 01m 31.83s90.38261°	-57° 10′ 52.0″-57.18112°	3.3′′	Good	12.0′	4.6 ks	Matches known X-ray source: 1RXS J060131.8-571041 (from ROSAT/RASSFSC), 11.8″ away. Matches SIMBAD source: 1RXS J060131.8-571041, 11.8″ away.
Mean XRT rate: 1.67 (±0.27) ×10^-2 ct s^-1 Peak XRT rate: 1.67 (±0.27) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 4.1 (±0.7) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 4.1 (±0.7) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
2 [details]	06h 00m 48.56s90.20233°	-57° 14′ 16.6″-57.23794°	7.3′′	Good	5.2′	8.5 ks
Mean XRT rate: 8.3 (±1.4) ×10^-3 ct s^-1 Peak XRT rate: 1.03 (±0.26) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 5.7 (±1.0) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 7.0 (±1.8) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
3 [details]	06h 00m 22.47s90.09361°	-57° 16′ 40.0″-57.27777°	5.7′′	Good	1.0′	8.5 ks
Mean XRT rate: 1.9 (+0.9, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 1.9 (+0.9, -0.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.5 (+0.7, -0.5) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 1.5 (+0.7, -0.5) ×10^-11 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
4 [details]	06h 01m 25.51s90.35629°	-57° 18′ 50.8″-57.31411°	6.0′′	Reasonable	9.4′	8.5 ks
Mean XRT rate: 1.4 (+0.7, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 1.4 (+0.7, -0.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 4.3 (+1.9, -1.5) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 4.3 (+1.9, -1.5) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
5 [details]	06h 01m 43.43s90.43094°	-57° 19′ 14.1″-57.32057°	8.3′′	Good	11.8′	8.1 ks
Mean XRT rate: 2.97 (+1.01, -0.83) ×10^-3 ct s^-1 Peak XRT rate: 2.97 (+1.01, -0.83) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.06 (+0.36, -0.30) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.06 (+0.36, -0.30) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
6 [details]	05h 59m 23.87s89.84945°	-57° 11′ 14.3″-57.18732°	8.5′′	Poor	9.4′	8.5 ks
Mean XRT rate: 1.5 (+0.7, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 1.5 (+0.7, -0.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.8 (+1.3, -1.0) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 2.8 (+1.3, -1.0) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
7 [details]	06h 00m 34.45s90.14356°	-57° 06′ 23.4″-57.10650°	9.0′′	Poor	11.2′	8.5 ks
Mean XRT rate: 2.1 (+0.8, -0.6) ×10^-3 ct s^-1 Peak XRT rate: 2.1 (+0.8, -0.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 5.4 (+2.1, -1.7) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 5.4 (+2.1, -1.7) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
8 [details]	06h 00m 45.59s90.18997°	-57° 06′ 29.0″-57.10804°	6.7′′	Poor	11.5′	8.5 ks
Mean XRT rate: 1.1 (+0.6, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 1.1 (+0.6, -0.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 14699199.01 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.2 (+0.7, -0.5) ×10^-10 erg cm^-1s^-1 Peak XRT flux: 1.2 (+0.7, -0.5) ×10^-10 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
9 [details]	05h 59m 14.89s89.81204°	-57° 11′ 21.4″-57.18927°	7.1′′	Poor	10.3′	8.5 ks
Mean XRT rate: 1.8 (+0.7, -0.6) ×10^-3 ct s^-1 Peak XRT rate: 1.8 (+0.7, -0.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 4.6 (+2.0, -1.6) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 4.6 (+2.0, -1.6) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
10 [details]	06h 00m 01.20s90.00499°	-57° 20′ 45.6″-57.34601°	11.6′′	Poor	4.0′	8.5 ks
Mean XRT rate: 10 (+5, -4) ×10^-4 ct s^-1 Peak XRT rate: 10 (+5, -4) ×10^-4 ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 8 (+4, -3) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 8 (+4, -3) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
11 [details]	05h 59m 25.90s89.85790°	-57° 18′ 08.0″-57.30221°	5.8′′	Poor	7.0′	8.5 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 6.0×10^-3 ct s^-1 (XRT equiv count-rate) Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
12 [details]	06h 00m 55.44s90.23099°	-57° 12′ 45.2″-57.21256°	5.9′′	Poor	6.9′	8.5 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 6.9×10^-3 ct s^-1 (XRT equiv count-rate) 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.

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Exposure map

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FITS exposure map.