GRB 210626A: Swift observation summary

Mission:	Swift/BAT-GUANO
GRB RA:	221.620°
GRB Dec:	-1.151°
GRB Err:	6.0 arcmin
T0:	2021-06-26 08:16:16 UT
Galactic:	351.98° +50.43°
Galactic N_H:	3.79× 10²⁰ cm^-2
Galactic E(B-V):	0.04820076

Sun distance:	123.39°
Sun angle:	8.41 [hr] (East of Sun)
Moon distance:	78.31°
Visibility of this field.

Data analysed so far:

ObsID: 00021453001 with 5.0 ks exposure.
ObsID: 00021453002 with 1.3 ks exposure.
ObsID: 00021453003 with 1.7 ks exposure.

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 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
1 [details]	14h 46m 05.95s221.52479°	-01° 09′ 21.4″-1.15595°	5.5′′	Good	5.7′	7.9 ks	The source is fading with 3.7-σ significance. The source is 7.0-σ above the 2SXPS limit.
Mean XRT rate: 7.0 (±1.5) ×10^-3 ct s^-1 Peak XRT rate: 7.0 (±1.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.0 (±0.4) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.0 (±0.4) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.09 [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 15 sources have been found in the XRT data. 10 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from Swift/BAT-GUANO pos	Exposure	Notes
1 [details]	14h 46m 05.95s221.52479°	-01° 09′ 21.4″-1.15595°	5.5′′	Good	5.7′	7.9 ks	The source is fading with 3.7-σ significance. The source is 7.0-σ above the 2SXPS limit.
Mean XRT rate: 7.0 (±1.5) ×10^-3 ct s^-1 Peak XRT rate: 7.0 (±1.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.0 (±0.4) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.0 (±0.4) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.09 [What is this?]
2 [details]	14h 46m 51.13s221.71304°	-01° 03′ 13.7″-1.05380°	10.7′′	Good	8.1′	7.9 ks	Matches SIMBAD source: GAMA 513126, 4.6″ away.
Mean XRT rate: 4.8 (±1.1) ×10^-3 ct s^-1 Peak XRT rate: 4.8 (±1.1) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.4 (±0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.4 (±0.5) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.3 [What is this?]
3 [details]	14h 46m 40.45s221.66854°	-01° 09′ 24.1″-1.15668°	8.6′′	Good	2.9′	7.9 ks	This source may be affected by extended emission Matches SIMBAD source: SDSS J144639.98-010922.9, 7″ away.
Mean XRT rate: 2.1 (+0.7, -0.6) ×10^-3 ct s^-1 Peak XRT rate: 2.1 (+0.7, -0.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Expected serendipitous sources: ~0.5 [What is this?]
4 [details]	14h 45m 59.66s221.49858°	-01° 13′ 18.4″-1.22178°	8.9′′	Good	8.4′	7.9 ks	Matches SIMBAD source: LBQS 1443-0100, 1.9″ away.
Mean XRT rate: 3.2 (±0.8) ×10^-3 ct s^-1 Peak XRT rate: 3.1 (±0.9) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.06 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.0 (±0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.9 (±0.5) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.5 [What is this?]
5 [details]	14h 46m 56.27s221.73446°	-01° 07′ 29.5″-1.12485°	8.2′′	Good	7.0′	7.9 ks	Matches SIMBAD source: 2MASS J14465594-0107275, 4.9″ away.
Mean XRT rate: 6.5 (±1.2) ×10^-3 ct s^-1 Peak XRT rate: 9.3 (±2.3) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.06 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.2 (±0.6) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 4.6 (±1.1) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.1 [What is this?]
6 [details]	14h 46m 39.83s221.66595°	-01° 05′ 14.6″-1.08739°	8.7′′	Poor	4.7′	7.9 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: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.3 (+0.8, -0.6) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 1.3 (+0.8, -0.6) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
7 [details]	14h 46m 50.32s221.70968°	-01° 16′ 20.5″-1.27236°	8.9′′	Good	9.1′	7.4 ks
Mean XRT rate: 1.4 (+0.7, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 1.4 (+0.7, -0.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Expected serendipitous sources: ~2.0 [What is this?]
8 [details]	14h 46m 43.69s221.68202°	-01° 11′ 09.8″-1.18605°	8.9′′	Poor	4.3′	7.9 ks
Mean XRT rate: 10 (+5, -4) ×10^-4 ct s^-1 Peak XRT rate: 10 (+5, -4) ×10^-4 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Expected serendipitous sources: ~1.1 [What is this?]
9 [details]	14h 45m 36.81s221.40339°	-01° 10′ 37.2″-1.17699°	11.4′′	Good	13.1′	3.6 ks	Matches known X-ray source: 2SXPS J144536.4-011031 (from 2SXPS), 9.2″ away. Matches SIMBAD source: [VV2006] J144536.3-011034, 9.2″ away.
Mean XRT rate: 3.5 (+1.5, -1.2) ×10^-3 ct s^-1 Peak XRT rate: 3.5 (+1.5, -1.2) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Products: Light curve \| Enhanced position \| Expected serendipitous sources: ~1.0 [What is this?]
10 [details]	14h 46m 10.89s221.54538°	-01° 03′ 56.5″-1.06569°	8.4′′	Poor	6.8′	7.9 ks
Mean XRT rate: 5.4 (+4.2, -3.0) ×10^-4 ct s^-1 Peak XRT rate: 5.4 (+4.2, -3.0) ×10^-4 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
11 [details]	14h 47m 18.76s221.82817°	-01° 06′ 26.4″-1.10734°	10.1′′	Poor	12.8′	1.4 ks	Matches SIMBAD source: 2dFGRS TGN281Z007, 9.4″ away.
Mean XRT rate: 4.7 (+2.9, -2.1) ×10^-3 ct s^-1 Peak XRT rate: 4.7 (+2.9, -2.1) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.6 [What is this?]
12 [details]	14h 46m 35.80s221.64915°	-01° 00′ 41.0″-1.01140°	8.6′′	Good	8.6′	7.9 ks	Matches SIMBAD source: GAMA 513093, 6″ away.
Mean XRT rate: 1.3 (+0.6, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 1.3 (+0.6, -0.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Expected serendipitous sources: ~1.9 [What is this?]
13 [details]	14h 46m 38.00s221.65832°	-01° 08′ 57.2″-1.14923°	9.5′′	Poor	2.3′	7.9 ks	This source may be affected by extended emission Matches SIMBAD source: 2SLAQ J144637.94-010856.9, 0.9″ away.
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: Light curve \| Expected serendipitous sources: ~1.0 [What is this?]
14 [details]	14h 46m 38.53s221.66054°	-01° 07′ 40.3″-1.12787°	13.6′′	Good	2.8′	7.9 ks	Matches SIMBAD source: NVSS J144638-010724, 8.1″ away.
Mean XRT rate: 1.7 (+0.6, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 1.7 (+0.6, -0.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 4.6 (+1.7, -1.4) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 4.6 (+1.7, -1.4) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.7 [What is this?]
15 [details]	14h 46m 16.82s221.57008°	-01° 15′ 14.4″-1.25400°	8.1′′	Good	6.9′	7.9 ks	Matches SIMBAD source: GAMA 493563, 9.3″ away.
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: Light curve \| 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.

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Exposure map

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FITS exposure map.