GRB 220921A: Swift observation summary

Mission:	Fermi/LAT
GRB RA:	66.790°
GRB Dec:	-40.250°
GRB Err:	25.2 arcmin
T0:	2022-09-21 11:05:59 UT
Galactic:	243.89° -43.99°
Galactic N_H:	2.25× 10²⁰ cm^-2
Galactic E(B-V):	0.03256757

Sun distance:	106.74°
Sun angle:	7.44 [hr](West of Sun)
Moon distance:	87.10°
Visibility of this field.

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.

About tiled field analysis.

So far 2 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.

21514 — 712 s of cleaned data taken between 2022-09-21 18:42:31 and 2022-09-21 18:57:48
21515 — 704 s of cleaned data taken between 2022-09-21 18:57:51 and 2022-09-21 19:10:00
21516 — 674 s of cleaned data taken between 2022-09-21 20:09:05 and 2022-09-21 20:22:17
21517 — 729 s of cleaned data taken between 2022-09-21 20:22:20 and 2022-09-21 22:01:01
21518 — 702 s of cleaned data taken between 2022-09-21 22:01:03 and 2022-09-21 22:13:10
21519 — 887 s of cleaned data taken between 2022-09-21 22:13:14 and 2022-09-21 23:27:11
21520 — 669 s of cleaned data taken between 2022-09-21 23:27:16 and 2022-09-21 23:39:26

Probable afterglow details

A source was found which matches the afterglow criteria.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from LAT pos	Exposure	Notes	Vizier
1 [details]	04h 25m 53.33s66.47220°	-40° 24′ 20.4″-40.40567°	3.2′′	Good	17.3′	1.6 ks	The source is 7.6-σ above the RASS limit.
Mean XRT rate: 9.6 (±1.0) ×10^-2 ct s^-1 Peak XRT rate: 0.20 (±0.04) ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.84 (±0.29) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 5.9 (±1.3) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position

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 8 sources have been found in the XRT data. 3 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from LAT pos	Exposure	Notes
1 [details]	04h 25m 53.33s66.47220°	-40° 24′ 20.4″-40.40567°	3.2′′	Good	17.3′	1.6 ks	The source is 7.6-σ above the RASS limit.
Mean XRT rate: 9.6 (±1.0) ×10^-2 ct s^-1 Peak XRT rate: 0.20 (±0.04) ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.84 (±0.29) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 5.9 (±1.3) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
2 [details]	04h 28m 36.60s67.15250°	-39° 48′ 26.3″-39.80730°	3.1′′	Good	31.4′	674 s	Matches known X-ray source: 1RXS J042836.3-394812 (from ROSAT/RASSBSC), 12.9″ away. Matches SIMBAD source: 1RXS J042836.3-394812, 5.3″ away.
Mean XRT rate: 3.8 (±1.0) ×10^-2 ct s^-1 Peak XRT rate: 3.8 (±1.0) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 5.8 (±1.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 5.8 (±1.5) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
3 [details]	04h 28m 28.12s67.11717°	-40° 43′ 59.5″-40.73319°	8.2′′	Good	32.6′	702 s
Mean XRT rate: 1.0 (+0.7, -0.5) ×10^-2 ct s^-1 Peak XRT rate: 1.0 (+0.7, -0.5) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate)
4 [details]	04h 28m 50.82s67.21176°	-40° 35′ 23.5″-40.58987°	6.8′′	Good	28.1′	702 s	Matches known X-ray source: 1RXS J042852.5-403509 (from ROSAT/RASSFSC), 23.7″ away. Matches SIMBAD source: TYC 7582-484-1, 5″ away.
Mean XRT rate: 1.1 (+0.6, -0.4) ×10^-2 ct s^-1 Peak XRT rate: 1.1 (+0.6, -0.4) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.6 (+0.9, -0.7) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.6 (+0.9, -0.7) ×10^-13 erg cm^-1s^-1 Products: Spectrum
5 [details]	04h 26m 03.79s66.51580°	-40° 10′ 23.1″-40.17309°	5.8′′	Good	13.4′	887 s
Mean XRT rate: 1.9 (+0.7, -0.5) ×10^-2 ct s^-1 Peak XRT rate: 1.9 (+0.7, -0.5) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate)
6 [details]	04h 28m 40.29s67.16788°	-39° 49′ 14.9″-39.82080°	8.3′′	Poor	31.1′	674 s
Mean XRT rate: 10 (+6, -4) ×10^-3 ct s^-1 Peak XRT rate: 10 (+6, -4) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (XRT equiv count-rate) Products: Spectrum
7 [details]	04h 28m 38.39s67.15998°	-40° 24′ 31.2″-40.40865°	12.7′′	Poor	19.4′	1.4 ks
Mean XRT rate: 4.9 (+3.1, -2.2) ×10^-3 ct s^-1 Peak XRT rate: 4.9 (+3.1, -2.2) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.4 (+0.9, -0.6) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.4 (+0.9, -0.6) ×10^-13 erg cm^-1s^-1 Products: Spectrum
8 [details]	04h 25m 21.14s66.33810°	-40° 26′ 20.4″-40.43899°	7.1′′	Good	23.6′	887 s	Matches known X-ray source: 1RXS J042522.2-402626 (from ROSAT/RASSFSC), 13.5″ away. Matches SIMBAD source: CD-40 1384, 7.8″ away.
Mean XRT rate: 1.4 (+0.6, -0.5) ×10^-2 ct s^-1 Peak XRT rate: 1.4 (+0.6, -0.5) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.75 (+1.25, -0.97) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.75 (+1.25, -0.97) ×10^-13 erg cm^-1s^-1 Products: Spectrum

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FITS exposure map.