GRB 250716A: Swift observation summary

Mission:	Fermi/GBM
GRB RA:	66.772°
GRB Dec:	-46.566°
GRB Err:	3 arcsec
T0:	2025-07-16 01:29:06 UT
Galactic:	252.65° -43.75°
Galactic N_H:	1.17× 10²⁰ cm^-2
Galactic E(B-V):	0.01264022

Sun distance:	80.85°
Sun angle:	3.25 [hr](West of Sun)
Moon distance:	75.63°
Visibility of this field.

Data analysed so far:

ObsID: 00021845001 with 2.6 ks exposure.
ObsID: 00021845002 with 1.6 ks exposure.

About ToO analysis.

Probable afterglow details

A source was found which matches the afterglow criteria.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from Fermi/GBM pos	Exposure	Notes	Vizier
1 [details]	04h 27m 05.23s66.77179°	-46° 33′ 59.5″-46.56652°	2.5′′	Good	1.9′′	4.2 ks	The source is 5.1-σ above the RASS limit.
Mean XRT rate: 0.108 (±0.006) ct s^-1 Peak XRT rate: 0.179 (±0.030) ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.26 (±0.18) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 5.4 (±0.9) ×10^-12 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 8 sources have been found in the XRT data. 1 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from Fermi/GBM pos	Exposure	Notes
1 [details]	04h 27m 05.23s66.77179°	-46° 33′ 59.5″-46.56652°	2.5′′	Good	1.9′′	4.2 ks	The source is 5.1-σ above the RASS limit.
Mean XRT rate: 0.108 (±0.006) ct s^-1 Peak XRT rate: 0.179 (±0.030) ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.26 (±0.18) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 5.4 (±0.9) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
2 [details]	04h 28m 02.00s67.00835°	-46° 32′ 51.4″-46.54761°	5.9′′	Good	9.8′	4.2 ks	Matches known X-ray source: 1RXS J042801.3-463238 (from ROSAT/RASSFSC), 14.8″ away. Matches SIMBAD source: 2MASS J04280188-4632508, 1.4″ away.
Mean XRT rate: 7.4 (+1.9, -1.7) ×10^-3 ct s^-1 Peak XRT rate: 8.4 (±2.2) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.4 (+0.4, -0.3) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.6 (±0.4) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
3 [details]	04h 27m 57.53s66.98969°	-46° 27′ 16.9″-46.45468°	7.1′′	Good	11.2′	4.2 ks
Mean XRT rate: 4.3 (+1.6, -1.3) ×10^-3 ct s^-1 Peak XRT rate: 4.3 (+1.6, -1.3) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.3 (+0.9, -0.7) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.3 (+0.9, -0.7) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
4 [details]	04h 26m 59.51s66.74794°	-46° 43′ 02.7″-46.71743°	6.9′′	Good	9.1′	4.2 ks
Mean XRT rate: 3.5 (+1.5, -1.2) ×10^-3 ct s^-1 Peak XRT rate: 3.5 (+1.5, -1.2) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 9 (+4, -3) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 9 (+4, -3) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
5 [details]	04h 26m 54.50s66.72709°	-46° 28′ 52.6″-46.48127°	7.3′′	Reasonable	5.4′	4.2 ks
Mean XRT rate: 1.78 (+1.02, -0.78) ×10^-3 ct s^-1 Peak XRT rate: 1.78 (+1.02, -0.78) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 8 (+5, -4) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 8 (+5, -4) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
6 [details]	04h 27m 29.38s66.87244°	-46° 37′ 05.7″-46.61824°	8.1′′	Good	5.2′	4.2 ks
Mean XRT rate: 6.4 (+1.6, -1.5) ×10^-3 ct s^-1 Peak XRT rate: 6.4 (±1.8) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 9.6×10^-3 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.3 (+0.6, -0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.3 (±0.7) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
7 [details]	04h 27m 38.98s66.91240°	-46° 32′ 37.7″-46.54382°	5.4′′	Reasonable	5.9′	4.2 ks
Mean XRT rate: 1.91 (+1.06, -0.81) ×10^-3 ct s^-1 Peak XRT rate: 1.91 (+1.06, -0.81) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.7 (+1.5, -1.2) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 2.7 (+1.5, -1.2) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
8 [details]	04h 27m 28.11s66.86714°	-46° 30′ 38.7″-46.51076°	7.3′′	Poor	5.1′	4.2 ks
Mean XRT rate: 1.6 (+1.0, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 1.6 (+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?]

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.