GRB 250612A: Swift observation summary

Mission:	Swift-BAT
GRB RA:	250.903°
GRB Dec:	-38.902°
GRB Err:	3.0 arcmin
T0:	2025-06-12 01:02:05 UT
Galactic:	344.42° +4.60°
Galactic N_H:	3.08× 10²¹ cm^-2
Galactic E(B-V):	0.8961528

Sun distance:	162.36°
Sun angle:	11.38 [hr] (East of Sun)
Moon distance:	18.36°
Visibility of this field.

Data analysed so far:

ObsID: 01323295001 with 0.8 ks exposure.
ObsID: 01323295002 with 2.3 ks exposure.

About ToO analysis.

Find an upper limit.

Sources found so far

So far 9 sources have been found in the XRT data. 7 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from Swift-BAT pos	Exposure	Notes
1 [details]	16h 42m 46.63s250.69428°	-38° 46′ 52.5″-38.78126°	5.6′′	Good	12.2′	2.2 ks
Mean XRT rate: 7.7 (+2.9, -2.3) ×10^-3 ct s^-1 Peak XRT rate: 7.7 (+2.9, -2.3) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Products: Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=4.60°
2 [details]	16h 44m 15.01s251.06253°	-38° 56′ 39.8″-38.94439°	5.8′′	Good	7.9′	3.1 ks	This source may be affected by optical loading Matches known X-ray source: XMMSL3 J164415.0-385642 (from XMM-NEWTON/XMMSLEWCLN), 1.9″ away. Matches SIMBAD source: HD 150689, 4.8″ away.
Mean XRT rate: 1.25 (+0.28, -0.26) ×10^-2 ct s^-1 Peak XRT rate: 1.19 (±0.28) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.2 (±0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.1 (±0.5) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=4.60°
3 [details]	16h 42m 44.46s250.68526°	-38° 57′ 21.2″-38.95589°	5.1′′	Good	10.7′	3.1 ks	Matches SIMBAD source: HD 150439, 0.4″ away.
Mean XRT rate: 1.07 (±0.27) ×10^-2 ct s^-1 Peak XRT rate: 1.07 (±0.27) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.2 (±0.6) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.2 (±0.6) ×10^-13 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=4.60°
4 [details]	16h 43m 56.41s250.98505°	-38° 55′ 53.3″-38.93148°	5.5′′	Good	4.2′	3.1 ks	This source may be affected by optical loading Matches known X-ray source: XMMSL3 J164355.5-385551 (from XMM-NEWTON/XMMSLEWCLN), 9.7″ away. Matches SIMBAD source: HD 150624, 4.2″ away.
Mean XRT rate: 5.6 (+2.0, -1.6) ×10^-3 ct s^-1 Peak XRT rate: 5.6 (+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: 5.0 (+1.8, -1.5) ×10^-10 erg cm^-1s^-1 Peak XRT flux: 5.0 (+1.8, -1.5) ×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=4.60°
5 [details]	16h 42m 55.03s250.72929°	-38° 54′ 12.3″-38.90341°	6.2′′	Good	8.1′	3.1 ks	Matches known X-ray source: 1RXS J164253.6-385401 (from ROSAT/RASSFSC), 19.8″ away.
Mean XRT rate: 9.7 (±2.5) ×10^-3 ct s^-1 Peak XRT rate: 9.7 (±2.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 5.7 (±1.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 5.7 (±1.5) ×10^-13 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=4.60°
6 [details]	16h 43m 15.97s250.81654°	-38° 47′ 16.4″-38.78789°	6.6′′	Reasonable	7.9′	3.1 ks	Matches SIMBAD source: 2MASS J16431594-3847166, 0.4″ away.
Mean XRT rate: 2.4 (+1.4, -1.0) ×10^-3 ct s^-1 Peak XRT rate: 2.4 (+1.4, -1.0) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.4 (+2.0, -1.4) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 3.4 (+2.0, -1.4) ×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=4.60°
7 [details]	16h 43m 18.63s250.82761°	-38° 55′ 48.8″-38.93021°	8.7′′	Poor	3.9′	3.1 ks	Matches SIMBAD source: Gaia DR3 5970954833079394688, 5.4″ away.
Mean XRT rate: 2.12 (+1.29, -0.95) ×10^-3 ct s^-1 Peak XRT rate: 2.12 (+1.29, -0.95) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 4.3 (+2.6, -1.9) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 4.3 (+2.6, -1.9) ×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=4.60°
8 [details]	16h 43m 48.57s250.95239°	-39° 03′ 48.2″-39.06340°	6.7′′	Poor	10.0′	3.1 ks	Matches SIMBAD source: Gaia DR3 5970949335521001984, 2.1″ away.
Mean XRT rate: 3.5 (+1.7, -1.3) ×10^-3 ct s^-1 Peak XRT rate: 3.5 (+1.7, -1.3) ×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?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=4.60°
9 [details]	16h 44m 13.49s251.05621°	-38° 51′ 35.9″-38.85997°	7.9′′	Reasonable	7.6′	3.1 ks
Mean XRT rate: 2.9 (+1.6, -1.2) ×10^-3 ct s^-1 Peak XRT rate: 2.9 (+1.6, -1.2) ×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=4.60°

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.