GRB 220527A: Swift observation summary

Mission:	Fermi/LAT
GRB RA:	323.570°
GRB Dec:	-14.900°
GRB Err:	4.8 arcmin
T0:	2022-05-27 09:17:15 UT
Galactic:	37.50° -42.70°
Galactic N_H:	5.03× 10²⁰ cm^-2
Galactic E(B-V):	0.06515502

Sun distance:	105.05°
Sun angle:	6.71 [hr] (West of Sun)
Moon distance:	70.47°
Visibility of this field.

Data analysed so far:

ObsID: 00021503001 with 1.7 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 LAT pos	Exposure	Notes	Vizier
2 [details]	21h 34m 06.73s323.52805°	-14° 58′ 18.6″-14.97183°	2.6′′	Good	4.9′	1.7 ks	The source is 8.3-σ above the RASS limit.
Mean XRT rate: 0.387 (±0.022) ct s^-1 Peak XRT rate: 0.64 (±0.14) ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.39 (±0.08) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 2.3 (±0.5) ×10^-11 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~7.34×10^-5 [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 2 sources have been found in the XRT data. 0 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from LAT pos	Exposure	Notes
1 [details]	21h 33m 58.01s323.49171°	-15° 03′ 32.8″-15.05911°	3.6′′	Good	10.6′	1.7 ks
Mean XRT rate: 1.0 (+0.4, -0.3) ×10^-2 ct s^-1 Peak XRT rate: 1.0 (+0.4, -0.3) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.10 (+1.15, -0.94) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 3.10 (+1.15, -0.94) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.1 [What is this?]
2 [details]	21h 34m 06.73s323.52805°	-14° 58′ 18.6″-14.97183°	2.6′′	Good	4.9′	1.7 ks	The source is 8.3-σ above the RASS limit.
Mean XRT rate: 0.387 (±0.022) ct s^-1 Peak XRT rate: 0.64 (±0.14) ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.39 (±0.08) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 2.3 (±0.5) ×10^-11 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~7.34×10^-5 [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

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FITS image.

Exposure map

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FITS exposure map.