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GRB 240225B: Swift observation summary
| Mission: | MAXI |
|---|---|
| GRB RA: | 128.458° |
| GRB Dec: | +27.487° |
| GRB Err: | 30.0 arcmin |
| T0: | 2024-02-25 20:15:58 UT |
| Galactic: | 196.50° +33.48° |
| Galactic NH: | 3.44× 1020 cm-2 |
| Galactic E(B-V): | 0.03989654 |
| Sun distance: | 146.56° |
|---|---|
| Sun angle: | 10.02 [hr](East of Sun) |
| Moon distance: | 46.98° |
| Visibility of this field. | |
| First slew: | 2024-02-26 04:13:25 UT |
| First observation: | 2024-02-26 04:12:51 UT |
| First analysis: | UT |
Source 1 has been manually confirmed as the GRB afterglow; data for this object are now available through the main GRB results area for this GRB.
So far 1 fields have been scheduled for observations. Data are available and processed for 7 of these. The list gives the exposure time used in source detection. If any individual sources were selected for follow-up observations, the source detection is not repeated for the follow up observations and the table below is not updated.
- 21675 — 283 s of cleaned data taken between 2024-02-26 04:13:23 and 2024-02-26 04:20:47
- 21676 — 290 s of cleaned data taken between 2024-02-26 04:20:50 and 2024-02-26 04:26:04
- 21677 — 290 s of cleaned data taken between 2024-02-26 04:26:07 and 2024-02-26 04:31:20
- 21678 — 293 s of cleaned data taken between 2024-02-26 04:31:24 and 2024-02-26 04:36:41
- 21679 — 157 s of cleaned data taken between 2024-02-26 05:48:27 and 2024-02-26 05:54:17
- 21680 — 285 s of cleaned data taken between 2024-02-26 05:54:19 and 2024-02-26 05:59:35
- 21681 — 183 s of cleaned data taken between 2024-02-26 07:22:12 and 2024-02-26 07:28:22
An additional 1 field has also been used for follow up observations. These data are not searched for sources, but are used to update the light curves etc of any sources already found.
Probable afterglow details
A source was found which matches the afterglow criteria.
| # | RA (J2000) | Dec (J2000) | Err901 | Detection Flag2 |
Dist from MAXI pos |
Exposure | Notes | Vizier |
|---|---|---|---|---|---|---|---|---|
| 1 [details] |
08h 33m 27.11s | +27° 04′ 28.5″ | 4.4′′ | Good | 25.3′ | 1.4 ks | The source is fading with 4.3-σ significance. The source is 5.4-σ above the RASS limit. |
 |
1 Radius, 90% confidence.
2 Indicates how likely the source is to be real. See the 1SXPS documentation.
* 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 3 sources have been found in the XRT data. 1 sources match catalogued sources.
| # | RA (J2000) | Dec (J2000) | Err901 | Detection Flag2 |
Dist from MAXI pos |
Exposure | Notes | Vizier |
|---|---|---|---|---|---|---|---|---|
| 1 [details] |
08h 33m 27.11s | +27° 04′ 28.5″ | 4.4′′ | Good | 25.3′ | 1.4 ks | The source is fading with 4.3-σ significance. The source is 5.4-σ above the RASS limit. |
|
| 2 [details] |
08h 33m 03.67s | +27° 22′ 39.0″ | 11.2′′ | Good | 12.2′ | 574 s | Matches known X-ray source: 1RXS J083303.3+272240 (from ROSAT/RASSFSC), 5.1071018242294″ away. Matches SIMBAD source: 1RXS J083303.3+272240, 6.7″ away. |
|
| 3 [details] |
08h 32m 18.38s | +27° 32′ 43.5″ | 6.5′′ | Good | 20.6′ | 569 s | |
1 Radius, 90% confidence.
2 Indicates how likely the source is to be real. See the 1SXPS documentation.
* 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.
