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SVOM_FIELD00032
SVOM
32
/SVOM
GRB 250831A: Swift observation summary
| Mission: | SVOM/ECLAIRs |
|---|---|
| SVOM RA: | 24.836° |
| SVOM Dec: | -17.929° |
| SVOM Err: | 8.6 arcmin |
| T0: | 2025-08-31 09:28:52 UT |
| Galactic: | 175.63° -75.63° |
| Galactic NH: | 1.39× 1020 cm-2 |
| Sun distance: | 135.07° |
|---|---|
| Sun angle: | 8.98 [hr](West of Sun) |
| Moon distance: | 119.44° |
| Visibility of this field. | |
| First slew: | 2025-08-31 10:18:42 UT |
| First observation: | 2025-08-31 10:18:12 UT |
| First analysis: | 2025-08-31 12:41:36 UT |
- Data analysed so far:
- ObsID: 03000058001 with 1.6 ks exposure.
So far 1 fields have been scheduled for observations. Data are available and processed for 1 of these.
- 3000058 — 1.6 ks of cleaned data taken between 2025-08-31 10:18:40 and 2025-08-31 11:56:25
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] |
01h 39m 07.42s | -17° 56′ 46.5″ | 2.2′′ * | Good | 1 (T) | 3.3′ | 1.6 ks | The source is 4.6-σ above the LSPXS limit. This source may be affected by optical loading |
 |
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.
Sources found so far
So far 4 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 | Vizier |
|---|---|---|---|---|---|---|---|---|---|
| 1 [details] |
01h 39m 07.42s | -17° 56′ 46.5″ | 2.2′′ * | Good | 1 (T) | 3.3′ | 1.6 ks | The source is 4.6-σ above the LSPXS limit. This source may be affected by optical loading |
|
| 2 [details] |
01h 39m 09.31s | -17° 57′ 32.3″ | 5.4′′ | Poor | 3 (U) | 3.2′ | 1.6 ks | The source is fading with 4.1-σ significance. The source is 4.7-σ above the LSPXS limit. |
|
| 3 [details] |
01h 39m 32.85s | -17° 55′ 32.6″ | 8.1′′ | Poor | 4 (K) | 2.9′ | 1.6 ks | Matches SIMBAD source: SDSS J013934.38-175541.9, 23.8″ away. Matches known X-ray source: LSXPS J013933.3-175540 (from LSXPS), 10.3″ away. |
|
| 4 [details] |
01h 39m 08.47s | -17° 56′ 22.4″ | 5.6′′ | Poor | 3 (U) | 3.0′ | 1.6 ks | The source is 4.7-σ above the LSPXS limit. This source may be affected by optical loading |
|
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
Select image style: Draggable PNG | JS9.
