GRB 251013C: Swift observation summary

This is a confirmed GRB (GRB 251013C), the afterglow is source 1 -- please see the GRB results at https://www.swift.ac.uk/xrt_products/03000137 for updated analysis

Mission:	SVOM/ECLAIRs
SVOM RA:	345.881°
SVOM Dec:	-0.170°
SVOM Err:	2.9 arcmin
T0:	2025-10-13 17:39:42 UT
Galactic:	74.60° -52.61°
Galactic N_H:	4.06× 10²⁰ cm^-2

Sun distance:	146.28°
Sun angle:	9.81 [hr] (East of Sun)
Moon distance:	122.29°
Visibility of this field.
First slew:	2025-10-13 17:45:26 UT
First observation:	2025-10-13 17:44:57 UT
First analysis:	2025-10-13 20:56:28 UT

Data analysed so far:

ObsID: 03000137001 with 1.8 ks exposure.

About tiled field analysis.

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

3000137 — 1.8 ks of cleaned data taken between 2025-10-13 17:45:26 and 2025-10-13 19:11:51

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]	23h 03m 20.59s345.83581°	-00° 12′ 35.9″-0.20997°	3.5′′	Good	1 (T)	3.6′	1.8 ks	The source is 5.4-σ above the RASS limit.
Mean XRT rate: 2.36 (±0.08) ct s^-1 Peak XRT rate: 10.2 (±1.9) ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 3.07 (±0.11) ct s^-1 Peak XRT rate converted to PSPC: 13.3 (±2.4) ct s^-1 Mean XRT flux: 8.71 (±0.30) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 3.8 (±0.7) ×10^-10 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.

Find an upper limit.

Sources found so far

So far 2 sources have been found in the XRT data. 1 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Rank³	Dist from SVOM/ECLAIRs pos	Exposure	Notes
1 [details]	23h 03m 20.59s345.83581°	-00° 12′ 35.9″-0.20997°	3.5′′	Good	1 (T)	3.6′	1.8 ks	The source is 5.4-σ above the RASS limit.
Mean XRT rate: 2.36 (±0.08) ct s^-1 Peak XRT rate: 10.2 (±1.9) ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 3.07 (±0.11) ct s^-1 Peak XRT rate converted to PSPC: 13.3 (±2.4) ct s^-1 Mean XRT flux: 8.71 (±0.30) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 3.8 (±0.7) ×10^-10 erg cm^-1s^-1 Products: Light curve \| Spectrum
2 [details]	23h 03m 06.69s345.77789°	-00° 05′ 08.0″-0.08555°	5.7′′	Good	4 (K)	8.0′	1.8 ks	Matches SIMBAD source: [VV2006c] J230306.8-000509, 3″ away. Matches known X-ray source: 4XMM J230306.8-000508 (from XMM-NEWTON/XMMSSC), 3.0059756819097″ away.
Mean XRT rate: 9.4 (+3.2, -2.6) ×10^-3 ct s^-1 Peak XRT rate: 9.4 (+3.2, -2.6) ×10^-3 ct s^-1 7.10 σ below 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: 6.3 (+2.2, -1.8) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 6.3 (+2.2, -1.8) ×10^-3 ct s^-1 Mean XRT flux: 7.5 (+2.6, -2.1) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 7.5 (+2.6, -2.1) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum

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FITS exposure map.