GRB 251027A: Swift observation summary

Mission:	SVOM/ECLAIRs
SVOM RA:	95.186°
SVOM Dec:	+11.687°
SVOM Err:	9.5 arcmin
T0:	2025-10-27 09:37:56 UT
Galactic:	199.05° -1.38°
Galactic N_H:	5.56× 10²¹ cm^-2

Sun distance:	118.03°
Sun angle:	7.76 [hr](West of Sun)
Moon distance:	163.32°
Visibility of this field.

Data analysed so far:

ObsID: 03000158001 with 1.6 ks exposure.

About tiled field analysis.

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

3000158 — 1.6 ks of cleaned data taken between 2025-10-27 10:52:37 and 2025-10-27 12:58:39

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]	06h 20m 52.19s95.21747°	+11° 46′ 45.0″11.77916°	7.5′′	Good	3 (U)	5.8′	1.6 ks	Matches SIMBAD source: NVSS J062052+114645, 0.1″ away.
Mean XRT rate: 5.4 (+2.7, -2.0) ×10^-3 ct s^-1 Peak XRT rate: 5.4 (+2.7, -2.0) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 1755075697211.16 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 1.9 (+0.9, -0.7) ×10^-16 ct s^-1 Peak XRT rate converted to PSPC: 1.9 (+0.9, -0.7) ×10^-16 ct s^-1 Mean XRT flux: 1.9 (+0.9, -0.7) ×10^-10 erg cm^-1s^-1 Peak XRT flux: 1.9 (+0.9, -0.7) ×10^-10 erg cm^-1s^-1 Products: Light curve \| Spectrum
2 [details]	06h 20m 54.38s95.22659°	+11° 35′ 18.4″11.58846°	5.5′′	Good	3 (U)	6.4′	1.6 ks	This source is affected by optical loading. Matches SIMBAD source: HD 255570, 5.4″ away.
Mean XRT rate: 4.6 (+2.6, -1.9) ×10^-3 ct s^-1 Peak XRT rate: 4.6 (+2.6, -1.9) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (PSPC count-rate) Products: Light curve \| Spectrum
3 [details]	06h 21m 05.28s95.27202°	+11° 29′ 59.1″11.49976°	8.8′′	Poor	3 (U)	12.3′	1.6 ks
Mean XRT rate: 5.7 (+3.5, -2.5) ×10^-3 ct s^-1 Peak XRT rate: 5.7 (+3.5, -2.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (PSPC count-rate) Products: Light curve

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.