GRB 221231A: Swift observation summary

Mission:	Swift/BAT-GUANO
GRB RA:	336.260°
GRB Dec:	+25.139°
GRB Err:	5.0 arcmin
T0:	2022-12-31 21:46:05 UT
Galactic:	85.67° -26.94°
Galactic N_H:	5.26× 10²⁰ cm^-2
Galactic E(B-V):	0.06122098

Sun distance:	72.23°
Sun angle:	3.70 [hr] (East of Sun)
Moon distance:	52.72°
Visibility of this field.

Data analysed so far:

ObsID: 00021534001 with 5.0 ks exposure.
ObsID: 00021534002 with 4.9 ks exposure.

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 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-GUANO pos	Exposure	Notes	Vizier
2 [details]	22h 25m 01.44s336.25600°	+25° 07′ 47.2″25.12978°	3.0′′	Good	0.6′	9.9 ks	The source is fading with 3.3-σ significance.
Mean XRT rate: 7.1 (+1.2, -1.1) ×10^-3 ct s^-1 Peak XRT rate: 1.08 (±0.20) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.0 (±0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 4.6 (±0.8) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]

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 13 sources have been found in the XRT data. 2 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from Swift/BAT-GUANO pos	Exposure	Notes
1 [details]	22h 25m 22.98s336.34577°	+25° 10′ 20.3″25.17231°	6.5′′	Poor	5.1′	9.9 ks	Matches SIMBAD source: SDSS J222522.65+251017.7, 5.2″ away.
Mean XRT rate: 1.2 (+0.6, -0.4) ×10^-3 ct s^-1 Peak XRT rate: 1.2 (+0.6, -0.4) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.9 (+1.8, -1.5) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 3.9 (+1.8, -1.5) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
2 [details]	22h 25m 01.44s336.25600°	+25° 07′ 47.2″25.12978°	3.0′′	Good	0.6′	9.9 ks	The source is fading with 3.3-σ significance.
Mean XRT rate: 7.1 (+1.2, -1.1) ×10^-3 ct s^-1 Peak XRT rate: 1.08 (±0.20) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.0 (±0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 4.6 (±0.8) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
3 [details]	22h 24m 48.46s336.20192°	+25° 01′ 47.3″25.02982°	5.4′′	Good	7.3′	9.9 ks
Mean XRT rate: 9 (+5, -4) ×10^-4 ct s^-1 Peak XRT rate: 9 (+5, -4) ×10^-4 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 5.8 (+3.0, -2.3) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 5.8 (+3.0, -2.3) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
4 [details]	22h 24m 51.50s336.21459°	+25° 15′ 48.7″25.26353°	8.9′′	Poor	7.9′	9.9 ks
Mean XRT rate: 7 (+4, -3) ×10^-4 ct s^-1 Peak XRT rate: 7 (+4, -3) ×10^-4 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.5 (+0.9, -0.7) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 1.5 (+0.9, -0.7) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
5 [details]	22h 24m 58.84s336.24515°	+25° 11′ 14.1″25.18724°	5.7′′	Good	3.0′	9.9 ks	Matches SIMBAD source: SDSS J222458.45+251112.7, 5.5″ away.
Mean XRT rate: 4.87 (+1.04, -1.00) ×10^-3 ct s^-1 Peak XRT rate: 5.7 (±1.4) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.18 (+0.25, -0.24) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.4 (±0.3) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
6 [details]	22h 24m 40.56s336.16900°	+25° 13′ 42.8″25.22856°	5.4′′	Good	7.3′	9.9 ks
Mean XRT rate: 1.6 (+0.6, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 1.6 (+0.6, -0.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate) Products: Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
7 [details]	22h 24m 17.07s336.07111°	+25° 09′ 19.5″25.15543°	8.5′′	Poor	10.3′	9.9 ks
Mean XRT rate: 2.0 (+0.7, -0.6) ×10^-3 ct s^-1 Peak XRT rate: 2.0 (+0.7, -0.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 6.6 (+2.4, -1.9) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 6.6 (+2.4, -1.9) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
8 [details]	22h 24m 18.68s336.07782°	+25° 14′ 07.4″25.23540°	3.9′′	Good	11.5′	9.9 ks
Mean XRT rate: 1.9 (+0.7, -0.6) ×10^-3 ct s^-1 Peak XRT rate: 1.9 (+0.7, -0.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 7.1 (+2.6, -2.1) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 7.1 (+2.6, -2.1) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
9 [details]	22h 24m 22.34s336.09310°	+25° 08′ 11.9″25.13665°	8.6′′	Poor	9.1′	9.9 ks
Mean XRT rate: 9 (+5, -4) ×10^-4 ct s^-1 Peak XRT rate: 9 (+5, -4) ×10^-4 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?]
10 [details]	22h 25m 36.93s336.40387°	+25° 10′ 32.0″25.17556°	8.0′′	Poor	8.1′	9.9 ks
Mean XRT rate: 8 (+5, -3) ×10^-4 ct s^-1 Peak XRT rate: 8 (+5, -3) ×10^-4 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?]
11 [details]	22h 24m 15.40s336.06417°	+25° 11′ 47.8″25.19662°	6.9′′	Poor	11.2′	9.9 ks
Mean XRT rate: 1.0 (+0.5, -0.4) ×10^-3 ct s^-1 Peak XRT rate: 1.0 (+0.5, -0.4) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate) Products: Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
12 [details]	22h 24m 12.38s336.05158°	+25° 10′ 01.3″25.16704°	7.9′′	Good	11.4′	9.8 ks
Mean XRT rate: 3.1 (±0.8) ×10^-3 ct s^-1 Peak XRT rate: 3.1 (±0.8) ×10^-3 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?]
13 [details]	22h 25m 39.75s336.41564°	+25° 06′ 06.7″25.10186°	6.0′′	Good	8.7′	9.9 ks
Mean XRT rate: 1.4 (+0.6, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 1.4 (+0.6, -0.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 5.9 (+2.5, -2.0) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 5.9 (+2.5, -2.0) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]

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.

Magnify image and make scrollable?

FITS image.

Exposure map

Magnify exposure map and make scrollable?

FITS exposure map.