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Home > GRB products > GRB 251022A

TILED_GRB00139

NEWGRB

139

/xrt_products

GRB 251022A: Swift observation summary

Source 4 has been manually confirmed as the GRB afterglow; data for this object are now available through the main GRB results area for this GRB.

About tiled field analysis.

So far 4 fields have been scheduled for observations. Data are available and processed for 4 of these. The list gives the exposure time used in source detection. If any individual sources were selected for follow-up observations, the source detection is not repeated for the follow up observations and the table below is not updated.

• 21864 — 1.0 ks of cleaned data taken between 2025-10-23 05:56:25 and 2025-10-23 07:40:48
• 21868 — 1.2 ks of cleaned data taken between 2025-10-23 07:40:52 and 2025-10-23 09:17:39
• 21869 — 398 s of cleaned data taken between 2025-10-23 09:17:43 and 2025-10-23 10:38:45
• 21871 — 2.0 ks of cleaned data taken between 2025-10-23 16:47:35 and 2025-10-23 18:30:01

Probable afterglow details

A source was found which matches the afterglow criteria.

#	RA (J2000)	Dec (J2000)	Err901	Detection Flag2	Dist from LAT pos	Exposure	Notes	Vizier
4 [details]	04h 21m 59.23s65.49681°	-18° 55′ 07.8″-18.91884°	4.8′′	Good	24.4′	6.6 ks	The source is fading with 4.0-σ significance.
Mean XRT rate: 1.10 (±0.25) ×10-2 ct s-1 Peak XRT rate: 1.10 (±0.25) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.04 ct s-1 (XRT equiv count-rate) Mean XRT flux: 3.1 (±0.7) ×10-13 erg cm-1s-1 Peak XRT flux: 3.1 (±0.7) ×10-13 erg cm-1s-1 Products: Light curve | Spectrum

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.

Find an upper limit.

Sources found so far

So far 9 sources have been found in the XRT data. 3 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err901	Detection Flag2	Dist from LAT pos	Exposure	Notes	Vizier
1 [details]	04h 20m 03.25s65.01354°	-19° 19′ 50.1″-19.33059°	6.3′′	Good	20.8′	1.0 ks
Mean XRT rate: 1.7 (+0.6, -0.5) ×10-2 ct s-1 Peak XRT rate: 1.7 (+0.6, -0.5) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.16 ct s-1 (XRT equiv count-rate) Mean XRT flux: 3.5 (+1.2, -1.0) ×10-12 erg cm-1s-1 Peak XRT flux: 3.5 (+1.2, -1.0) ×10-12 erg cm-1s-1 Products: Spectrum | Enhanced position
2 [details]	04h 20m 23.62s65.09840°	-19° 15′ 45.2″-19.26255°	5.4′′	Good	16.2′	1.0 ks
Mean XRT rate: 1.1 (+0.5, -0.4) ×10-2 ct s-1 Peak XRT rate: 1.1 (+0.5, -0.4) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.05 ct s-1 (XRT equiv count-rate) Mean XRT flux: 4.4 (+1.8, -1.4) ×10-13 erg cm-1s-1 Peak XRT flux: 4.4 (+1.8, -1.4) ×10-13 erg cm-1s-1 Products: Spectrum
3 [details]	04h 22m 24.70s65.60291°	-18° 54′ 55.8″-18.91549°	4.4′′	Good	26.8′	6.2 ks	Matches known X-ray source: LSXPS J042224.8-185458 (from LSXPS), 3.3″ away.
Mean XRT rate: 1.48 (+0.19, -0.18) ×10-2 ct s-1 Peak XRT rate: 1.8 (±0.3) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.0×100 ct s-1 (XRT equiv count-rate) Mean XRT flux: 2.5 (±0.3) ×10-13 erg cm-1s-1 Peak XRT flux: 3.0 (±0.6) ×10-13 erg cm-1s-1 Products: Light curve | Spectrum
4 [details]	04h 21m 59.23s65.49681°	-18° 55′ 07.8″-18.91884°	4.8′′	Good	24.4′	6.6 ks	The source is fading with 4.0-σ significance.
Mean XRT rate: 1.10 (±0.25) ×10-2 ct s-1 Peak XRT rate: 1.10 (±0.25) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.04 ct s-1 (XRT equiv count-rate) Mean XRT flux: 3.1 (±0.7) ×10-13 erg cm-1s-1 Peak XRT flux: 3.1 (±0.7) ×10-13 erg cm-1s-1 Products: Light curve | Spectrum
5 [details]	04h 21m 31.10s65.37958°	-18° 59′ 08.4″-18.98566°	6.0′′	Good	19.5′	6.6 ks
Mean XRT rate: 6.3 (+1.6, -1.3) ×10-3 ct s-1 Peak XRT rate: 7.7 (+2.6, -2.1) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.03 ct s-1 (XRT equiv count-rate) Mean XRT flux: 1.6 (+0.4, -0.3) ×10-13 erg cm-1s-1 Peak XRT flux: 2.0 (+0.7, -0.5) ×10-13 erg cm-1s-1 Products: Spectrum
6 [details]	04h 22m 10.93s65.54555°	-19° 06′ 30.8″-19.10855°	6.5′′	Good	15.3′	3.8 ks
Mean XRT rate: 6.0 (+2.5, -2.0) ×10-3 ct s-1 Peak XRT rate: 6.0 (+2.5, -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: 1.9 (+0.8, -0.6) ×10-13 erg cm-1s-1 Peak XRT flux: 1.9 (+0.8, -0.6) ×10-13 erg cm-1s-1 Products: Spectrum
7 [details]	04h 22m 50.18s65.70907°	-18° 57′ 30.0″-18.95833°	7.1′′	Good	28.2′	4.6 ks	Matches known X-ray source: LSXPS J042249.9-185733 (from LSXPS), 4.7″ away.
Mean XRT rate: 5.2 (+1.8, -1.3) ×10-3 ct s-1 Peak XRT rate: 5.5 (+2.7, -2.1) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.0×100 ct s-1 (XRT equiv count-rate) Mean XRT flux: 2.5 (+0.9, -0.7) ×10-13 erg cm-1s-1 Peak XRT flux: 2.7 (+1.3, -1.0) ×10-13 erg cm-1s-1 Products: Spectrum
8 [details]	04h 21m 45.16s65.43816°	-19° 01′ 36.6″-19.02684°	7.8′′	Good	17.3′	6.6 ks
Mean XRT rate: 3.2 (+1.8, -1.3) ×10-3 ct s-1 Peak XRT rate: 3.2 (+1.8, -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: 10 (+6, -4) ×10-14 erg cm-1s-1 Peak XRT flux: 10 (+6, -4) ×10-14 erg cm-1s-1 Products: Spectrum
9 [details]	04h 21m 34.95s65.39561°	-19° 03′ 27.4″-19.05761°	6.3′′	Reasonable	15.2′	6.6 ks	Matches SIMBAD source: NVSS J042135-190324, 5.9″ away.
Mean XRT rate: 3.44 (+1.23, -0.93) ×10-3 ct s-1 Peak XRT rate: 3.3 (+1.5, -1.2) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.04 ct s-1 (XRT equiv count-rate) Mean XRT flux: 1.9 (+0.7, -0.5) ×10-13 erg cm-1s-1 Peak XRT flux: 1.8 (+0.8, -0.6) ×10-13 erg cm-1s-1 Products: Spectrum

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.

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Exposure map

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FITS exposure map.