GRB 251111A: Swift observation summary

This is a confirmed GRB (GRB 251111A), the afterglow is source 1 -- please see the GRB results at https://www.swift.ac.uk/xrt_products/03000189 for updated analysis

Mission:	SVOM/ECLAIRs
SVOM RA:	32.378°
SVOM Dec:	+5.257°
SVOM Err:	7.6 arcmin
T0:	2025-11-11 05:10:15 UT
Galactic:	156.08° -52.52°
Galactic N_H:	4.37× 10²⁰ cm^-2

Sun distance:	161.80°
Sun angle:	11.07 [hr](East of Sun)
Moon distance:	94.61°
Visibility of this field.

Data analysed so far:

ObsID: 03000189001 with 0.3 ks exposure.
ObsID: 03000189002 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.

3000189 — 2.1 ks of cleaned data taken between 2025-11-11 07:13:42 and 2025-11-11 15:25:54

Find an upper limit.

Sources found so far

So far 3 sources have been found in the XRT data. 2 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Rank³	Dist from SVOM/ECLAIRs pos	Exposure	Notes
1 [details]	02h 09m 26.80s32.36166°	+05° 13′ 41.3″5.22815°	5.1′′ ^*	Good	3 (U)	2.0′	2.1 ks
Mean XRT rate: 8.1 (+2.7, -2.2) ×10^-3 ct s^-1 Peak XRT rate: 8.1 (+2.7, -2.2) ×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: 0.012 (+0.004, -0.003) ×10^-2 ct s^-1 Peak XRT rate converted to PSPC: 0.012 (+0.004, -0.003) ×10^-2 ct s^-1 Mean XRT flux: 3.0 (+1.0, -0.8) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 3.0 (+1.0, -0.8) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
2 [details]	02h 09m 41.19s32.42162°	+05° 22′ 43.0″5.37862°	4.0′′ ^*	Good	4 (K)	7.7′	2.1 ks	Matches known X-ray source: CXO J020940.9+052243 (from Chandra/2CSC), 5.9455515219072″ away.
Mean XRT rate: 2.1 (+0.5, -0.4) ×10^-2 ct s^-1 Peak XRT rate: 2.4 (±0.6) ×10^-2 ct s^-1 0.00 σ above the catalogued flux from Chandra/2CSC. RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.038 (±0.008) ct s^-1 Peak XRT rate converted to PSPC: 0.043 (±0.011) ×10^-2 ct s^-1 Mean XRT flux: 4.2 (±0.9) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 4.9 (±1.2) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
3 [details]	02h 09m 51.81s32.46589°	+05° 22′ 03.4″5.36760°	6.2′′	Good	4 (K)	8.5′	2.1 ks	Matches known X-ray source: CXO J020951.5+052158 (from Chandra/2CSC), 5.9619027193381″ away.
Mean XRT rate: 8.3 (+2.9, -2.3) ×10^-3 ct s^-1 Peak XRT rate: 8.3 (+2.9, -2.3) ×10^-3 ct s^-1 0.00 σ above the catalogued flux from Chandra/2CSC. RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 7.4 (+2.5, -2.1) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 7.4 (+2.5, -2.1) ×10^-3 ct s^-1 Mean XRT flux: 6.1 (+2.1, -1.7) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 6.1 (+2.1, -1.7) ×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 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.

Image

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FITS image.

Exposure map

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FITS exposure map.