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Home > SVOM follow up > GRB 251016A

SVOM_FIELD00042

SVOM

42

/SVOM

GRB 251016A: Swift observation summary

Data analysed so far:

• ObsID: 03000141001 with 1.6 ks exposure.
• ObsID: 03000141002 with 1.9 ks exposure.

About tiled field analysis.

So far 1 fields have been scheduled for observations. Data are available and processed for 1 of these.

• 3000141 — 3.5 ks of cleaned data taken between 2025-10-16 16:48:36 and 2025-10-17 02:13:06

Details of afterglow candidates

1 sources were found which matches the afterglow criteria.

#	RA (J2000)	Dec (J2000)	Err901	Detection Flag2	Rank3	Dist from SVOM/ECLAIRs pos	Exposure	Notes	Vizier
1 [details]	17h 45m 12.67s266.30279°	-39° 33′ 36.3″-39.56008°	3.2′′ *	Good	1 (T)	4.5′	3.5 ks	The source is fading with 3.8-σ significance.
Mean XRT rate: 3.1 (±0.6) ×10-2 ct s-1 Peak XRT rate: 7.1 (±1.9) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.10 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.024 (±0.004) ct s-1 Peak XRT rate converted to PSPC: 0.056 (±0.015) ×10-2 ct s-1 Mean XRT flux: 2.0 (±0.4) ×10-12 erg cm-1s-1 Peak XRT flux: 4.6 (±1.2) ×10-12 erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position

¹ Radius, 90% confidence.
² Indicates how likely the source is to be real. See the LSXPS documentation.
³ T=Transient Source, O=Outbursting known source, U=Uncatalogued X-ray source, K=Known X-ray source.
^* 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 33 sources have been found in the XRT data. 8 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err901	Detection Flag2	Rank3	Dist from SVOM/ECLAIRs pos	Exposure	Notes	Vizier
1 [details]	17h 45m 12.67s266.30279°	-39° 33′ 36.3″-39.56008°	3.2′′ *	Good	1 (T)	4.5′	3.5 ks	The source is fading with 3.8-σ significance.
Mean XRT rate: 3.1 (±0.6) ×10-2 ct s-1 Peak XRT rate: 7.1 (±1.9) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.10 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.024 (±0.004) ct s-1 Peak XRT rate converted to PSPC: 0.056 (±0.015) ×10-2 ct s-1 Mean XRT flux: 2.0 (±0.4) ×10-12 erg cm-1s-1 Peak XRT flux: 4.6 (±1.2) ×10-12 erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position
2 [details]	17h 44m 39.77s266.16570°	-39° 45′ 50.5″-39.76402°	5.1′′ *	Poor	3 (U)	11.4′	3.5 ks	The source is fading with 4.2-σ significance.
Mean XRT rate: 2.3 (±0.5) ×10-2 ct s-1 Peak XRT rate: 2.3 (±0.5) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.38 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 4.7 (±1.1) ct s-1 Peak XRT rate converted to PSPC: 4.7 (±1.1) ×10-3 ct s-1 Mean XRT flux: 2.2 (±0.5) ×10-9 erg cm-1s-1 Peak XRT flux: 2.2 (±0.5) ×10-9 erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position
3 [details]	17h 44m 31.83s266.13263°	-39° 39′ 13.4″-39.65371°	5.9′′	Poor	3 (U)	5.7′	3.5 ks
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.0×100 ct s-1 (PSPC count-rate) Mean XRT flux: undetermined erg cm-1s-1 Peak XRT flux: undetermined erg cm-1s-1 Products: Light curve | Spectrum
4 [details]	17h 44m 56.10s266.23373°	-39° 27′ 22.1″-39.45615°	3.9′′ *	Poor	3 (U)	7.4′	3.5 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: 0.20 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 2.6 (+1.3, -1.1) ct s-1 Peak XRT rate converted to PSPC: 2.6 (+1.3, -1.1) ×10-3 ct s-1 Mean XRT flux: 4.7 (+2.3, -1.9) ×10-11 erg cm-1s-1 Peak XRT flux: 4.7 (+2.3, -1.9) ×10-11 erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position
5 [details]	17h 43m 53.57s265.97322°	-39° 28′ 39.0″-39.47749°	4.8′′ *	Poor	3 (U)	12.4′	3.5 ks
Mean XRT rate: 2.5 (+1.4, -1.1) ×10-3 ct s-1 Peak XRT rate: 2.5 (+1.4, -1.1) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.02 ct s-1 (PSPC count-rate) Products: Light curve | Enhanced position
6 [details]	17h 45m 00.55s266.25228°	-39° 44′ 02.7″-39.73408°	11.1′′	Poor	3 (U)	9.7′	3.5 ks	The source is fading with 3.0-σ significance.
Mean XRT rate: 1.4 (±0.4) ×10-2 ct s-1 Peak XRT rate: 1.4 (±0.4) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 3.89 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 1.7 (±0.5) ct s-1 Peak XRT rate converted to PSPC: 1.7 (±0.5) ×10-4 ct s-1 Mean XRT flux: 7.8 (±2.3) ×10-94 erg cm-1s-1 Peak XRT flux: 7.8 (±2.3) ×10-94 erg cm-1s-1 Products: Light curve | Spectrum
7 [details]	17h 44m 11.27s266.04696°	-39° 24′ 28.3″-39.40786°	13.9′′	Poor	3 (U)	12.6′	1.2 ks	Matches SIMBAD source: OGLE BLG-DSCT-13120, 43.9″ away.
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: 0.04 ct s-1 (PSPC count-rate) Products: Light curve
8 [details]	17h 44m 27.14s266.11306°	-39° 35′ 00.6″-39.58350°	11.9′′	Poor	3 (U)	4.4′	3.5 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 (PSPC count-rate) Mean XRT rate converted to PSPC: undetermined ct s-1 Peak XRT rate converted to PSPC: undetermined ct s-1 Products: Light curve
9 [details]	17h 45m 02.63s266.26095°	-39° 27′ 15.0″-39.45418°	22.9′′ *	Poor	3 (U)	7.8′	3.5 ks
Mean XRT rate: 3.9 (+1.7, -1.4) ×10-3 ct s-1 Peak XRT rate: 3.9 (+1.7, -1.4) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.03 ct s-1 (PSPC count-rate) Products: Light curve | Enhanced position
10 [details]	17h 44m 23.46s266.09777°	-39° 31′ 27.0″-39.52417°	3.6′′ *	Good	4 (K)	6.0′	3.5 ks	Matches SIMBAD source: Gaia DR3 5961120384410461568, 5.5″ away. Matches known X-ray source: 4XMM J174423.5-393129 (from XMM-NEWTON/XMMSSC), 4.7393695984787″ away.
Mean XRT rate: 1.68 (±0.29) ×10-2 ct s-1 Peak XRT rate: 1.7 (±0.4) ×10-2 ct s-1 -0.32 σ above the catalogued flux from XMM-NEWTON/XMMSSC. RASS PSPC 3-σ upper limit: 0.0×100 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.031 (±0.005) ct s-1 Peak XRT rate converted to PSPC: 0.030 (±0.007) ×10-2 ct s-1 Mean XRT flux: 2.9 (±0.5) ×10-13 erg cm-1s-1 Peak XRT flux: 2.8 (±0.7) ×10-13 erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position
11 [details]	17h 44m 30.07s266.12529°	-39° 42′ 47.4″-39.71316°	4.8′′ *	Poor	3 (U)	9.0′	3.5 ks
Mean XRT rate: 1.1 (±0.4) ×10-2 ct s-1 Peak XRT rate: 1.1 (±0.4) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.05 ct s-1 (PSPC count-rate) Products: Light curve | Enhanced position
12 [details]	17h 43m 58.13s265.99220°	-39° 41′ 07.3″-39.68537°	11.8′′	Poor	3 (U)	11.9′	3.5 ks	Matches SIMBAD source: OGLE BLG-RRLYR-53234, 32.7″ away.
Mean XRT rate: 4.9 (+1.8, -1.5) ×10-3 ct s-1 Peak XRT rate: 4.9 (+1.8, -1.5) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.08 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 5.4 (+2.0, -1.7) ×10-3 ct s-1 Peak XRT rate converted to PSPC: 5.4 (+2.0, -1.7) ×10-3 ct s-1 Mean XRT flux: 4.2 (+1.6, -1.3) ×10-12 erg cm-1s-1 Peak XRT flux: 4.2 (+1.6, -1.3) ×10-12 erg cm-1s-1 Products: Light curve | Spectrum
13 [details]	17h 44m 37.85s266.15772°	-39° 45′ 00.3″-39.75008°	7.5′′	Poor	3 (U)	10.6′	3.5 ks
Mean XRT rate: 7.2 (±2.0) ×10-3 ct s-1 Peak XRT rate: 7.2 (±2.0) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.03 ct s-1 (PSPC count-rate) Products: Light curve
14 [details]	17h 44m 48.57s266.20237°	-39° 44′ 22.0″-39.73943°	7.0′′	Poor	3 (U)	9.7′	3.5 ks	The source is fading with 3.5-σ significance. This source may be affected by optical loading
Mean XRT rate: 3.5 (±0.9) ×10-2 ct s-1 Peak XRT rate: 3.5 (±0.9) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.03 ct s-1 (PSPC count-rate) Products: Light curve
15 [details]	17h 44m 05.59s266.02328°	-39° 40′ 13.3″-39.67035°	15.3′′	Poor	3 (U)	10.2′	3.5 ks
Mean XRT rate: 3.4 (+1.7, -1.4) ×10-3 ct s-1 Peak XRT rate: 3.4 (+1.7, -1.4) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.04 ct s-1 (PSPC count-rate) Products: Light curve
16 [details]	17h 45m 09.74s266.29058°	-39° 40′ 48.4″-39.68012°	8.7′′	Poor	3 (U)	7.3′	3.5 ks
Mean XRT rate: 4.4 (+2.1, -1.8) ×10-3 ct s-1 Peak XRT rate: 4.4 (+2.1, -1.8) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.05 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 8 (+4, -3) ×10-3 ct s-1 Peak XRT rate converted to PSPC: 8 (+4, -3) ×10-3 ct s-1 Products: Light curve
17 [details]	17h 44m 50.01s266.20839°	-39° 25′ 02.5″-39.41735°	15.5′′ *	Poor	3 (U)	9.6′	3.5 ks
Mean XRT rate: 5.0 (+1.8, -1.5) ×10-3 ct s-1 Peak XRT rate: 5.0 (+1.8, -1.5) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.04 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 9.2 (+3.3, -2.7) ×10-5 ct s-1 Peak XRT rate converted to PSPC: 9.2 (+3.3, -2.7) ×10-5 ct s-1 Products: Light curve | Enhanced position
18 [details]	17h 44m 47.66s266.19859°	-39° 45′ 06.3″-39.75174°	29.0′′	Poor	3 (U)	10.5′	3.5 ks	The source is fading with 3.9-σ significance. This source may be affected by optical loading Matches SIMBAD source: 2MASS J17444702-3944431, 24.2″ away.
Mean XRT rate: 3.2 (±0.8) ×10-2 ct s-1 Peak XRT rate: 3.2 (±0.8) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 1838746.46 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 1.3 (±0.3) ct s-1 Peak XRT rate converted to PSPC: 1.3 (±0.3) ×10-9 ct s-1 Mean XRT flux: 9.9 (±2.5) ×10-89 erg cm-1s-1 Peak XRT flux: 9.9 (±2.5) ×10-89 erg cm-1s-1 Products: Light curve | Spectrum
19 [details]	17h 44m 55.48s266.23116°	-39° 26′ 42.2″-39.44506°	6.4′′ *	Poor	3 (U)	8.0′	3.5 ks
Mean XRT rate: 2.7 (+1.4, -1.1) ×10-3 ct s-1 Peak XRT rate: 2.7 (+1.4, -1.1) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.03 ct s-1 (PSPC count-rate) Products: Light curve | Enhanced position
20 [details]	17h 44m 51.91s266.21628°	-39° 43′ 02.4″-39.71733°	7.3′′	Poor	3 (U)	8.4′	3.5 ks	This source may be affected by optical loading
Mean XRT rate: 4.2 (+1.8, -1.5) ×10-3 ct s-1 Peak XRT rate: 4.2 (+1.8, -1.5) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.03 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 2.3 (+1.0, -0.8) ×10-26 ct s-1 Peak XRT rate converted to PSPC: 2.3 (+1.0, -0.8) ×10-26 ct s-1 Products: Light curve | Spectrum
21 [details]	17h 45m 02.36s266.25985°	-39° 24′ 01.5″-39.40043°	9.9′′	Poor	3 (U)	10.9′	3.5 ks
Mean XRT rate: 2.32 (+1.31, -0.97) ×10-3 ct s-1 Peak XRT rate: 2.32 (+1.31, -0.97) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.05 ct s-1 (PSPC count-rate) Products: Light curve
22 [details]	17h 44m 21.35s266.08895°	-39° 45′ 30.2″-39.75839°	6.6′′	Poor	3 (U)	12.2′	3.5 ks
Mean XRT rate: 5.3 (+1.9, -1.5) ×10-3 ct s-1 Peak XRT rate: 5.3 (+1.9, -1.5) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.04 ct s-1 (PSPC count-rate) Products: Light curve
23 [details]	17h 44m 42.72s266.17800°	-39° 43′ 58.4″-39.73289°	5.7′′	Poor	3 (U)	9.4′	3.5 ks	The source is fading with 3.1-σ significance.
Mean XRT rate: 1.8 (±0.5) ×10-2 ct s-1 Peak XRT rate: 1.8 (±0.5) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.0×100 ct s-1 (PSPC count-rate) Mean XRT flux: 3.7 (±1.0) ×10-16 erg cm-1s-1 Peak XRT flux: 3.7 (±1.0) ×10-16 erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position
24 [details]	17h 44m 15.45s266.06438°	-39° 36′ 29.0″-39.60805°	8.1′′ *	Poor	3 (U)	6.9′	3.5 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 (PSPC count-rate) Mean XRT rate converted to PSPC: undetermined ct s-1 Peak XRT rate converted to PSPC: undetermined ct s-1 Products: Light curve | Enhanced position
25 [details]	17h 44m 54.64s266.22768°	-39° 42′ 39.4″-39.71094°	10.9′′	Poor	3 (U)	8.1′	3.5 ks	This source may be affected by optical loading Matches SIMBAD source: Gaia DR3 5961114478906316800, 24.9″ away.
Mean XRT rate: 1.0 (±0.4) ×10-2 ct s-1 Peak XRT rate: 1.0 (±0.4) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.0×100 ct s-1 (PSPC count-rate) Mean XRT flux: 10 (±4) ×10-19 erg cm-1s-1 Peak XRT flux: 10 (±4) ×10-19 erg cm-1s-1 Products: Light curve | Spectrum
26 [details]	17h 44m 03.54s266.01474°	-39° 41′ 51.9″-39.69774°	20.8′′	Poor	3 (U)	11.5′	3.5 ks	Matches SIMBAD source: Gaia DR3 5961116914166221312, 24.3″ away.
Mean XRT rate: 4.1 (+1.8, -1.4) ×10-3 ct s-1 Peak XRT rate: 4.1 (+1.8, -1.4) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.04 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 2.41 (+1.04, -0.84) ×10-12 ct s-1 Peak XRT rate converted to PSPC: 2.41 (+1.04, -0.84) ×10-12 ct s-1 Products: Light curve
27 [details]	17h 45m 02.01s266.25839°	-39° 42′ 54.1″-39.71504°	11.5′′	Poor	3 (U)	8.6′	3.5 ks
Mean XRT rate: 1.3 (±0.4) ×10-2 ct s-1 Peak XRT rate: 1.3 (±0.4) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.03 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 5.0 (±1.6) ct s-1 Peak XRT rate converted to PSPC: 5.0 (±1.6) ×10-12 ct s-1 Products: Light curve
28 [details]	17h 45m 33.54s266.38975°	-39° 32′ 41.9″-39.54496°	13.8′′	Poor	3 (U)	8.7′	3.5 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 (PSPC count-rate) Products: Light curve
29 [details]	17h 44m 42.81s266.17838°	-39° 25′ 38.7″-39.42743°	5.1′′ *	Poor	3 (U)	9.1′	3.5 ks	Matches SIMBAD source: Gaia DR3 5961126981480525952, 18.7″ away.
Mean XRT rate: 4.8 (+1.8, -1.5) ×10-3 ct s-1 Peak XRT rate: 4.8 (+1.8, -1.5) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.03 ct s-1 (PSPC count-rate) Products: Light curve | Enhanced position
30 [details]	17h 45m 17.17s266.32155°	-39° 27′ 13.4″-39.45372°	6.7′′ *	Poor	3 (U)	9.1′	3.5 ks
Mean XRT rate: 4.7 (+1.9, -1.6) ×10-3 ct s-1 Peak XRT rate: 4.7 (+1.9, -1.6) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.03 ct s-1 (PSPC count-rate) Products: Light curve | Enhanced position
31 [details]	17h 44m 35.05s266.14604°	-39° 31′ 28.4″-39.52456°	7.4′′	Poor	3 (U)	4.2′	3.5 ks	Matches SIMBAD source: Gaia DR3 5961120526220762752, 15.4″ away.
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.10 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: undetermined ct s-1 Peak XRT rate converted to PSPC: undetermined ct s-1 Mean XRT flux: undetermined erg cm-1s-1 Peak XRT flux: undetermined erg cm-1s-1 Products: Light curve | Spectrum
32 [details]	17h 45m 19.83s266.33263°	-39° 26′ 47.1″-39.44641°	6.8′′	Poor	3 (U)	9.8′	3.5 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 (PSPC count-rate) Products: Light curve
33 [details]	17h 44m 28.66s266.11941°	-39° 33′ 35.3″-39.55982°	7.8′′	Poor	3 (U)	4.2′	3.5 ks
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.06 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: undetermined ct s-1 Peak XRT rate converted to PSPC: undetermined ct s-1 Mean XRT flux: undetermined erg cm-1s-1 Peak XRT flux: undetermined erg cm-1s-1 Products: Light curve | Spectrum

¹ Radius, 90% confidence.
² Indicates how likely the source is to be real. See the LSXPS documentation.
³ T=Transient Source, O=Outbursting known source, U=Uncatalogued X-ray source, K=Known X-ray source.
^* 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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