GRB 220107B: Swift observation summary

Mission:	Fermi/LAT
GRB RA:	216.500°
GRB Dec:	+20.000°
GRB Err:	16.8 arcmin
T0:	2022-01-07 19:01:33 UT
Galactic:	19.77° +67.23°
Galactic N_H:	2.72× 10²⁰ cm^-2
Galactic E(B-V):	0.03656115

Sun distance:	82.37°
Sun angle:	4.83 [hr](West of Sun)
Moon distance:	139.12°
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 3 fields have been scheduled for observations. Data are available and processed for 3 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.

21477 — 1.7 ks of cleaned data taken between 2022-01-08 04:35:59 and 2022-01-08 05:05:10
21478 — 1.7 ks of cleaned data taken between 2022-01-08 05:05:14 and 2022-01-08 07:54:45
21479 — 1.7 ks of cleaned data taken between 2022-01-08 06:35:33 and 2022-01-08 09:27:57

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 LAT pos	Exposure	Notes	Vizier
1 [details]	14h 25m 37.61s216.40672°	+20° 10′ 14.2″20.17062°	2.7′′	Good	11.5′	4.7 ks	The source is fading with 4.0-σ significance. The source is 6.7-σ above the RASS limit.
Mean XRT rate: 5.0 (±0.5) ×10^-2 ct s^-1 Peak XRT rate: 0.16 (±0.04) ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.96 (±0.18) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 6.1 (±1.4) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position Expected serendipitous sources: ~0.04 [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.

Find an upper limit.

Sources found so far

So far 7 sources have been found in the XRT data. 5 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from LAT pos	Exposure	Notes
1 [details]	14h 25m 37.61s216.40672°	+20° 10′ 14.2″20.17062°	2.7′′	Good	11.5′	4.7 ks	The source is fading with 4.0-σ significance. The source is 6.7-σ above the RASS limit.
Mean XRT rate: 5.0 (±0.5) ×10^-2 ct s^-1 Peak XRT rate: 0.16 (±0.04) ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.96 (±0.18) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 6.1 (±1.4) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position Expected serendipitous sources: ~0.04 [What is this?]
2 [details]	14h 24m 56.89s216.23705°	+20° 00′ 25.7″20.00715°	3.7′′	Good	14.8′	1.7 ks	Matches known X-ray source: 2E 1422.6+2014 (from EINSTEIN/IPC), 30.655322832911″ away. Matches SIMBAD source: 4C 20.33, 3.2″ away.
Mean XRT rate: 2.6 (±0.5) ×10^-2 ct s^-1 Peak XRT rate: 2.5 (±0.6) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 7.8 (+1.6, -1.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 7.6 (±1.8) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Enhanced position Expected serendipitous sources: ~0.1 [What is this?]
3 [details]	14h 25m 53.26s216.47192°	+20° 10′ 08.0″20.16888°	7.3′′	Poor	10.3′	4.7 ks	Matches SIMBAD source: QSO B1423+203, 4.7″ away.
Mean XRT rate: 3.8 (+1.7, -1.3) ×10^-3 ct s^-1 Peak XRT rate: 3.8 (+1.7, -1.3) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.1 (+0.9, -0.7) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.1 (+0.9, -0.7) ×10^-13 erg cm^-1s^-1 Products: Spectrum Expected serendipitous sources: ~0.7 [What is this?]
4 [details]	14h 26m 57.82s216.74091°	+19° 55′ 57.6″19.93268°	7.3′′	Good	14.2′	1.7 ks	Matches known X-ray source: 2SXPS J142658.1+195556 (from 2SXPS), 5.5″ away. Matches SIMBAD source: 1RXS J142657.8+195554, 3.2″ away.
Mean XRT rate: 4.2 (+2.4, -1.8) ×10^-3 ct s^-1 Peak XRT rate: 4.2 (+2.4, -1.8) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.6 (+1.5, -1.1) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.6 (+1.5, -1.1) ×10^-13 erg cm^-1s^-1 Products: Spectrum Expected serendipitous sources: ~1.2 [What is this?]
5 [details]	14h 27m 25.03s216.85430°	+19° 49′ 53.0″19.83139°	2.6′′	Good	22.4′	1.7 ks	Matches known X-ray source: 2SXPS J142725.1+194952 (from 2SXPS), 5.8″ away. Matches SIMBAD source: Mrk 813, 3.9″ away.
Mean XRT rate: 0.225 (±0.015) ct s^-1 Peak XRT rate: 0.29 (±0.05) ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 7.5 (±0.5) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 9.5 (±1.7) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position Expected serendipitous sources: ~3.48×10^-3 [What is this?]
6 [details]	14h 25m 26.92s216.36215°	+19° 47′ 13.9″19.78721°	6.6′′	Poor	14.9′	1.7 ks
Mean XRT rate: 3.1 (+2.1, -1.5) ×10^-3 ct s^-1 Peak XRT rate: 3.1 (+2.1, -1.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate)
7 [details]	14h 26m 13.28s216.55535°	+19° 55′ 24.8″19.92356°	2.8′′	Good	5.5′	1.7 ks	Matches known X-ray source: XMMSL2 J142612.8+195522 (from XMM-NEWTON/XMMSLEWCLN), 6.0995496244853″ away. Matches SIMBAD source: LEDA 1610278, 4.8″ away.
Mean XRT rate: 6.2 (±0.8) ×10^-2 ct s^-1 Peak XRT rate: 7.1 (±1.8) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.79 (±0.22) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 2.0 (±0.5) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position Expected serendipitous sources: ~0.03 [What is this?]

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FITS exposure map.