GRB 250728A: Swift observation summary

Mission:	Fermi/GBM; BAT/GUANO
GRB RA:	260.945°
GRB Dec:	+16.205°
GRB Err:	4.0 arcmin
T0:	2025-07-28 09:25:45 UT
Galactic:	38.38° +26.50°
Galactic N_H:	6.37× 10²⁰ cm^-2
Galactic E(B-V):	0.08863836

Sun distance:	122.21°
Sun angle:	8.89 [hr] (East of Sun)
Moon distance:	89.73°
Visibility of this field.

Data analysed so far:

ObsID: 00021852001 with 1.5 ks exposure.
ObsID: 00021852002 with 1.6 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 Fermi/GBM + BAT/GUANO pos	Exposure	Notes
1 [details]	17h 22m 58.84s260.74516°	+16° 12′ 03.7″16.20104°	8.1′′	Poor	11.5′	3.1 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate) Products: Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
2 [details]	17h 23m 48.55s260.95229°	+16° 02′ 07.4″16.03540°	6.4′′	Good	10.2′	3.1 ks	Matches known X-ray source: 1RXS J172347.9+160234 (from ROSAT/RASSFSC), 28.2″ away.
Mean XRT rate: 5.6 (+2.1, -1.7) ×10^-3 ct s^-1 Peak XRT rate: 5.6 (+2.1, -1.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.3 (+0.5, -0.4) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.3 (+0.5, -0.4) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
3 [details]	17h 23m 57.48s260.98949°	+16° 12′ 01.6″16.20044°	6.7′′	Reasonable	2.6′	3.1 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: undetermined erg cm^-1s^-1 Peak XRT flux: undetermined erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
4 [details]	17h 23m 51.75s260.96564°	+16° 04′ 55.5″16.08209°	6.6′′	Poor	7.5′	3.1 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: undetermined erg cm^-1s^-1 Peak XRT flux: undetermined 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.