GRB 210827A: Swift observation summary

Mission:	Swift/BAT-GUANO
GRB RA:	174.918°
GRB Dec:	+55.786°
GRB Err:	3.0 arcmin
T0:	2021-08-27 09:59:24 UT
Galactic:	142.32° +58.56°
Galactic N_H:	1.02× 10²⁰ cm^-2
Galactic E(B-V):	0.01277565

Sun distance:	48.16°
Sun angle:	1.25 [hr] (East of Sun)
Moon distance:	107.65°
Visibility of this field.

Data analysed so far:

ObsID: 00021461001 with 2.3 ks exposure.
ObsID: 00021461002 with 4.7 ks exposure.

Source 3 has been manually confirmed as the GRB afterglow; data for this object are now available through the main GRB results area for this GRB.

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Sources found so far

So far 12 sources have been found in the XRT data. 8 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from Swift/BAT-GUANO pos	Exposure	Notes
1 [details]	11h 40m 21.70s175.09043°	+55° 47′ 09.6″55.78601°	3.3′′	Good	5.8′	9.5 ks	Matches known X-ray source: 1WGA J1140.2+5547 (from ROSAT/WGACAT), 57.928339096177″ away.
Mean XRT rate: 3.7 (±0.8) ×10^-3 ct s^-1 Peak XRT rate: 4.2 (±1.0) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.05 (+0.23, -0.22) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.21 (±0.28) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.2 [What is this?]
2 [details]	11h 39m 18.78s174.82827°	+55° 36′ 49.9″55.61387°	2.9′′	Good	10.8′	2.2 ks	Matches SIMBAD source: MCG+09-19-147, 2.3″ away.
Mean XRT rate: 1.2 (±0.3) ×10^-2 ct s^-1 Peak XRT rate: 1.2 (±0.3) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.17 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 7.9 (±2.0) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 7.9 (±2.0) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.1 [What is this?]
3 [details]	11h 39m 36.07s174.90030°	+55° 43′ 26.2″55.72394°	3.7′′	Good	3.8′	2.2 ks
Mean XRT rate: 1.03 (±0.25) ×10^-2 ct s^-1 Peak XRT rate: 1.03 (±0.25) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 4.2 (±1.0) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 4.2 (±1.0) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~1.75×10^-2 [What is this?]
4 [details]	11h 39m 36.75s174.90313°	+55° 38′ 46.1″55.64614°	3.0′′	Good	8.4′	9.5 ks	Matches SIMBAD source: [KK2001] Anon 4 38, 3.7″ away.
Mean XRT rate: 5.75 (+1.07, -1.00) ×10^-3 ct s^-1 Peak XRT rate: 7.5 (+2.6, -2.1) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.5 (+0.5, -0.4) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 3.21 (+1.11, -0.90) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.2 [What is this?]
5 [details]	11h 38m 58.70s174.74459°	+55° 54′ 52.8″55.91467°	4.0′′	Good	9.7′	9.5 ks	Matches SIMBAD source: [VV2006] J113859.0+555453, 0.2″ away.
Mean XRT rate: 3.2 (±0.8) ×10^-3 ct s^-1 Peak XRT rate: 3.2 (±0.8) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.7 (±0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.7 (±0.5) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.7 [What is this?]
6 [details]	11h 38m 09.15s174.53814°	+55° 47′ 49.6″55.79710°	4.0′′	Good	12.8′	8.0 ks
Mean XRT rate: 2.3 (+0.8, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 2.3 (+0.8, -0.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 8.8 (+3.1, -2.5) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 8.8 (+3.1, -2.5) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~1.8 [What is this?]
7 [details]	11h 39m 42.74s174.92809°	+55° 53′ 07.8″55.88549°	2.3′′	Good	6.0′	6.1 ks	Matches known X-ray source: 1RXS J113941.2+555254 (from ROSAT/RASSFSC), 14.907524433878″ away. Matches SIMBAD source: 2MASS J11394268+5553056, 3.3″ away.
Mean XRT rate: 1.47 (±0.19) ×10^-2 ct s^-1 Peak XRT rate: 2.1 (±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: 4.5 (±0.6) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 6.6 (±1.6) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.03 [What is this?]
8 [details]	11h 39m 24.10s174.85040°	+55° 45′ 18.7″55.75519°	8.4′′	Good	2.9′	9.5 ks	Matches SIMBAD source: SDSS J113924.05+554514.9, 3.7″ away.
Mean XRT rate: 1.5 (+0.6, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 1.5 (+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: 4.7 (+1.8, -1.4) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 4.7 (+1.8, -1.4) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.2 [What is this?]
9 [details]	11h 38m 28.63s174.61927°	+55° 46′ 55.2″55.78201°	9.6′′	Poor	10.1′	9.5 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: 0.03 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
10 [details]	11h 38m 13.45s174.55606°	+55° 47′ 07.4″55.78540°	9.5′′	Poor	12.2′	9.5 ks	Matches SIMBAD source: NVSS J113813+554703, 4.4″ away.
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: 0.07 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.1 (+0.4, -0.3) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.1 (+0.4, -0.3) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~3.1 [What is this?]
11 [details]	11h 39m 24.95s174.85394°	+55° 43′ 02.8″55.71744°	8.5′′	Reasonable	4.6′	9.5 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: 0.03 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Expected serendipitous sources: ~0.5 [What is this?]
12 [details]	11h 39m 20.63s174.83595°	+55° 41′ 58.4″55.69956°	8.4′′	Poor	5.9′	9.5 ks	Matches SIMBAD source: [KK2001] Anon 4 29, 10.6″ away.
Mean XRT rate: 8 (+5, -4) ×10^-4 ct s^-1 Peak XRT rate: 8 (+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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FITS exposure map.