GRB 251026B: Swift observation summary

Mission:	Fermi/GBM
GRB RA:	133.228°
GRB Dec:	-6.258°
GRB Err:	0.49998 arcsec
T0:	2025-10-26 07:18:53 UT
Galactic:	233.75° +23.43°
Galactic N_H:	2.49× 10²⁰ cm^-2
Galactic E(B-V):	0.02484386

Sun distance:	76.34°
Sun angle:	5.16 [hr](West of Sun)
Moon distance:	121.42°
Visibility of this field.

Data analysed so far:

ObsID: 00021872001 with 2.0 ks exposure.

About ToO analysis.

Find an upper limit.

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 pos	Exposure	Notes
1 [details]	08h 52m 33.72s133.14050°	-06° 22′ 37.4″-6.37705°	7.1′′	Good	8.8′	2.0 ks	Matches known X-ray source: LSXPS J085233.7-062241 (from LSXPS), 4.5″ away. Matches SIMBAD source: ASAS J085232-0622.8, 4.5″ away.
Mean XRT rate: 3.3 (±0.8) ×10^-2 ct s^-1 Peak XRT rate: 3.3 (±0.8) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 5.7 (±1.4) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 5.7 (±1.4) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
2 [details]	08h 52m 32.23s133.13429°	-06° 24′ 22.1″-6.40615°	5.3′′	Good	10.5′	2.0 ks
Mean XRT rate: 1.1 (+0.4, -0.3) ×10^-2 ct s^-1 Peak XRT rate: 1.1 (+0.4, -0.3) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.08 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.3 (+0.8, -0.6) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.3 (+0.8, -0.6) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
3 [details]	08h 53m 30.83s133.37844°	-06° 06′ 41.1″-6.11142°	7.6′′	Good	12.6′	2.0 ks
Mean XRT rate: 5.5 (+2.7, -2.0) ×10^-3 ct s^-1 Peak XRT rate: 5.5 (+2.7, -2.0) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.1 (+1.5, -1.2) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 3.1 (+1.5, -1.2) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
4 [details]	08h 52m 39.44s133.16432°	-06° 20′ 39.8″-6.34438°	6.3′′	Good	6.4′	2.0 ks
Mean XRT rate: 6.3 (+2.5, -2.0) ×10^-3 ct s^-1 Peak XRT rate: 6.3 (+2.5, -2.0) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 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?]

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.