GRB 230217A: Swift observation summary

Mission:	Swift-BAT
GRB RA:	280.771°
GRB Dec:	-28.856°
GRB Err:	3.0 arcmin
T0:	2023-02-17 21:53:10 UT
Galactic:	6.03° -11.05°
Galactic N_H:	9.65× 10²⁰ cm^-2
Galactic E(B-V):	0.1824429

Sun distance:	49.43°
Sun angle:	3.33 [hr](West of Sun)
Moon distance:	15.34°
Visibility of this field.

Data analysed so far:

ObsID: 01154967001 with 4.8 ks exposure.
ObsID: 01154967002 with 5.0 ks exposure.

Source 3 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 ToO analysis.

Probable afterglow details

A source was found which matches the afterglow criteria.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from Swift-BAT pos	Exposure	Notes	Vizier
3 [details]	18h 43m 04.80s280.77002°	-28° 50′ 14.6″-28.83740°	4.7′′	Good	1.1′	9.8 ks	The source is fading with 3.4-σ significance.
Mean XRT rate: 8.2 (+1.2, -1.1) ×10^-3 ct s^-1 Peak XRT rate: 2.1 (±0.6) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.6 (±0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 9.5 (±2.5) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.05°

¹ Radius, 90% confidence.
² Indicates how likely the source is to be real. See the 2SXPS 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 17 sources have been found in the XRT data. 1 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from Swift-BAT pos	Exposure	Notes
1 [details]	18h 42m 20.68s280.58617°	-28° 59′ 13.1″-28.98697°	4.4′′	Good	12.5′	2.7 ks
Mean XRT rate: 1.5 (+0.6, -0.5) ×10^-2 ct s^-1 Peak XRT rate: 1.5 (+0.6, -0.5) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (XRT equiv count-rate) Products: Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.05°
2 [details]	18h 42m 31.70s280.63210°	-28° 52′ 21.4″-28.87260°	8.3′′	Poor	7.4′	9.8 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Products: Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.05°
3 [details]	18h 43m 04.80s280.77002°	-28° 50′ 14.6″-28.83740°	4.7′′	Good	1.1′	9.8 ks	The source is fading with 3.4-σ significance.
Mean XRT rate: 8.2 (+1.2, -1.1) ×10^-3 ct s^-1 Peak XRT rate: 2.1 (±0.6) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.6 (±0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 9.5 (±2.5) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.05°
4 [details]	18h 43m 48.84s280.95350°	-28° 44′ 06.3″-28.73509°	7.4′′	Poor	12.0′	7.1 ks
Mean XRT rate: 2.8 (+1.7, -1.3) ×10^-3 ct s^-1 Peak XRT rate: 2.8 (+1.7, -1.3) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Products: Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.05°
5 [details]	18h 43m 06.30s280.77625°	-28° 46′ 46.7″-28.77964°	6.4′′	Poor	4.6′	9.8 ks
Mean XRT rate: 1.8 (+0.7, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 2.22 (+1.04, -0.83) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.06 ct s^-1 (XRT equiv count-rate) Products: Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.05°
6 [details]	18h 43m 44.36s280.93482°	-28° 57′ 59.6″-28.96654°	6.5′′	Poor	10.9′	9.4 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Products: Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.05°
7 [details]	18h 43m 45.47s280.93946°	-28° 47′ 05.3″-28.78481°	7.5′′	Poor	9.8′	9.8 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Products: Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.05°
8 [details]	18h 43m 30.93s280.87886°	-28° 43′ 13.5″-28.72043°	6.5′′	Poor	9.9′	9.8 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Products: Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.05°
9 [details]	18h 43m 11.77s280.79904°	-29° 00′ 36.2″-29.01007°	6.1′′	Poor	9.4′	6.5 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.07 ct s^-1 (XRT equiv count-rate) Products: Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.05°
10 [details]	18h 43m 08.70s280.78624°	-28° 56′ 42.6″-28.94518°	6.7′′	Poor	5.4′	9.8 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Products: Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.05°
11 [details]	18h 43m 55.28s280.98034°	-28° 51′ 29.4″-28.85816°	6.2′′	Poor	11.0′	5.1 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Products: Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.05°
12 [details]	18h 43m 17.50s280.82294°	-28° 45′ 47.2″-28.76311°	6.1′′	Poor	6.2′	9.8 ks
Mean XRT rate: 1.9 (+1.0, -0.8) ×10^-3 ct s^-1 Peak XRT rate: 1.9 (+1.0, -0.8) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.3 (+1.7, -1.4) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 3.3 (+1.7, -1.4) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.05°
13 [details]	18h 43m 25.47s280.85614°	-28° 43′ 38.6″-28.72739°	6.0′′	Poor	8.9′	9.8 ks	Matches SIMBAD source: Gaia DR3 4071578526504680704, 6.9″ away.
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Products: Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.05°
14 [details]	18h 43m 01.76s280.75733°	-28° 56′ 26.6″-28.94073°	8.2′′	Poor	5.1′	9.8 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: undetermined erg cm^-1s^-1 Peak XRT flux: undetermined erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.05°
15 [details]	18h 43m 14.13s280.80888°	-28° 52′ 16.3″-28.87118°	5.7′′	Reasonable	2.2′	9.8 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 55.36 ct s^-1 (XRT equiv count-rate) Mean XRT flux: undetermined erg cm^-1s^-1 Peak XRT flux: undetermined erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.05°
16 [details]	18h 43m 51.71s280.96546°	-28° 42′ 07.5″-28.70208°	6.4′′	Poor	13.8′	3.2 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.06 ct s^-1 (XRT equiv count-rate) Mean XRT flux: undetermined erg cm^-1s^-1 Peak XRT flux: undetermined erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.05°
17 [details]	18h 43m 36.09s280.90038°	-28° 42′ 21.9″-28.70609°	6.3′′	Poor	11.3′	9.4 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.16 ct s^-1 (XRT equiv count-rate) Mean XRT flux: undetermined erg cm^-1s^-1 Peak XRT flux: undetermined erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.05°

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.

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FITS exposure map.