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GRB 230307A: Swift observation summary

Mission:Fermi/GBM
GRB RA:59.233°
GRB Dec:-75.226°
GRB Err:5.8 deg
T0:2023-03-07 15:44:06 UT
Galactic:289.62° -36.69°
Galactic NH:1.03× 1021 cm-2
Galactic E(B-V):0.1205059
Sun distance:80.23°
Sun angle:4.75 [hr](East of Sun)
Moon distance:103.23°
Visibility of this field.

Source 2 has been manually confirmed as the GRB afterglow; data for this object are now available through the main GRB results area for this GRB.

About tiled field analysis.

So far 32 fields have been scheduled for observations. Data are available and processed for 32 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.

Probable afterglow details

A source was found which matches the afterglow criteria.

# RA (J2000) Dec (J2000) Err901 Detection
Flag2
Dist from
Fermi/GBM pos
Exposure Notes Vizier
2
[details]
04h 03m 26.24s -75° 22′ 43.8″ 3.2′′ Good 26.4′ 11.9 ks The source is fading with 3.7-σ significance. Vizier logo

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.


Find an upper limit.

Sources found so far

So far 5 sources have been found in the XRT data. 1 sources match catalogued sources.

# RA (J2000) Dec (J2000) Err901 Detection
Flag2
Dist from
Fermi/GBM pos
Exposure Notes Vizier
1
[details]
04h 24m 36.54s -75° 41′ 33.7″ 2.8′′ Good 1.8° 498 s This source may be affected by optical loading
Matches known X-ray source: XMMSL2 J042435.7-754130 (from XMM-NEWTON/XMMSLEWCLN), 4.5993559579882″ away.
Matches SIMBAD source: HD 28839, 1.5″ away.
Vizier logo
2
[details]
04h 03m 26.24s -75° 22′ 43.8″ 3.2′′ Good 26.4′ 11.9 ks The source is fading with 3.7-σ significance. Vizier logo
3
[details]
04h 03m 57.67s -75° 21′ 27.7″ 6.1′′ Reasonable 27.9′ 11.9 ks Vizier logo
4
[details]
04h 04m 24.89s -75° 28′ 00.8″ 8.5′′ Poor 31.9′ 11.9 ks Vizier logo
5
[details]
04h 05m 12.23s -75° 15′ 26.8″ 6.7′′ Good 31.7′ 11.7 ks Vizier logo

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.

FITS image.

Image of all observations processed so far

Exposure map

FITS exposure map.

Exposure map of all observations processed so far