GRB 211018A: Swift observation summary

Mission:	Fermi/LAT
GRB RA:	19.677°
GRB Dec:	-3.599°
GRB Err:	11.3 arcmin
T0:	2021-10-18 22:28:13 UT
Galactic:	139.59° -65.58°
Galactic N_H:	3.62× 10²⁰ cm^-2
Galactic E(B-V):	0.04435902

Sun distance:	165.81°
Sun angle:	11.72 [hr](East of Sun)
Moon distance:	12.19°
Visibility of this field.

Data analysed so far:

ObsID: 00021463001 with 4.4 ks exposure.

About ToO analysis.

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Sources found so far

So far 5 sources have been found in the XRT data. 2 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from LAT pos	Exposure	Notes
1 [details]	01h 18m 23.66s19.59858°	-03° 39′ 04.1″-3.65115°	6.1′′	Good	5.6′	4.4 ks
Mean XRT rate: 2.68 (+1.16, -0.92) ×10^-3 ct s^-1 Peak XRT rate: 2.68 (+1.16, -0.92) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 9 (+4, -3) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 9 (+4, -3) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Enhanced position \| Expected serendipitous sources: ~1.0 [What is this?]
2 [details]	01h 18m 15.74s19.56558°	-03° 22′ 48.2″-3.38005°	5.1′′	Good	14.7′	1.6 ks	Matches SIMBAD source: GALEX 2673847386424477587, 1.6″ away.
Mean XRT rate: 10 (+4, -3) ×10^-3 ct s^-1 Peak XRT rate: 10 (+4, -3) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Products: Enhanced position \| Expected serendipitous sources: ~0.2 [What is this?]
3 [details]	01h 17m 49.06s19.45441°	-03° 39′ 58.4″-3.66621°	7.2′′	Good	13.9′	4.4 ks
Mean XRT rate: 3.6 (+1.4, -1.1) ×10^-3 ct s^-1 Peak XRT rate: 3.6 (+1.4, -1.1) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.9 (+0.7, -0.6) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.9 (+0.7, -0.6) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.9 [What is this?]
4 [details]	01h 18m 13.83s19.55763°	-03° 43′ 46.2″-3.72949°	3.2′′	Good	10.6′	4.4 ks	Matches SIMBAD source: PB 8689, 4.7″ away.
Mean XRT rate: 6.6 (±1.6) ×10^-3 ct s^-1 Peak XRT rate: 6.6 (±1.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.7 (±0.4) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.7 (±0.4) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.3 [What is this?]
5 [details]	01h 18m 37.16s19.65485°	-03° 36′ 23.9″-3.60664°	8.0′′	Good	1.4′	4.4 ks
Mean XRT rate: 2.46 (+1.08, -0.85) ×10^-3 ct s^-1 Peak XRT rate: 2.46 (+1.08, -0.85) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 5.3 (+2.3, -1.8) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 5.3 (+2.3, -1.8) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~1.1 [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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Exposure map

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FITS exposure map.