GRB 190816A: Swift observation summary

Mission:	Swift/BAT
GRB RA:	341.193°
GRB Dec:	-29.740°
GRB Err:	3.0 arcmin
T0:	2019-08-16 14:42:24 UT
Galactic:	20.02° -62.12°
Galactic N_H:	1.22× 10²⁰ cm^-2
Galactic E(B-V):	0.01711786

Sun distance:	158.55°
Sun angle:	10.97 [hr] (West of Sun)
Moon distance:	16.78°
Visibility of this field.

Data analysed so far:

ObsID: 00920783001 with 4.9 ks exposure.
ObsID: 00920783002 with 2.0 ks exposure.

Source 4 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 pos	Exposure	Notes	Vizier
4 [details]	22h 44m 45.48s341.18950°	-29° 45′ 27.4″-29.75761°	4.9′′	Good	1.1′	7.0 ks	The source is fading with 3.7-σ significance.
Mean XRT rate: 9.2 (±1.7) ×10^-3 ct s^-1 Peak XRT rate: 9.2 (±1.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.09 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.7 (±0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.7 (±0.5) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~1.48×10^-2 [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 9 sources have been found in the XRT data. 3 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from Swift/BAT pos	Exposure	Notes
1 [details]	22h 44m 18.80s341.07834°	-29° 54′ 42.5″-29.91180°	7.2′′	Good	11.9′	7.0 ks
Mean XRT rate: 2.1 (+0.8, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 2.1 (+0.8, -0.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.18 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 8.4 (+3.3, -2.6) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 8.4 (+3.3, -2.6) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~1.9 [What is this?]
2 [details]	22h 45m 17.40s341.32249°	-29° 45′ 58.9″-29.76636°	6.4′′	Good	6.9′	7.0 ks	Matches SIMBAD source: 2QZ J224517.5-294559, 1.4″ away.
Mean XRT rate: 1.9 (+0.8, -0.6) ×10^-3 ct s^-1 Peak XRT rate: 1.9 (+0.8, -0.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.11 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 4.7 (+1.9, -1.5) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 4.7 (+1.9, -1.5) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.7 [What is this?]
3 [details]	22h 44m 42.41s341.17669°	-29° 36′ 09.2″-29.60256°	6.1′′	Good	8.3′	6.6 ks	Matches SIMBAD source: 2QZ J224442.3-293611, 1.3″ away.
Mean XRT rate: 2.0 (+0.8, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 2.0 (+0.8, -0.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.42 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 4.5 (+1.8, -1.5) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 4.5 (+1.8, -1.5) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~1.0 [What is this?]
4 [details]	22h 44m 45.48s341.18950°	-29° 45′ 27.4″-29.75761°	4.9′′	Good	1.1′	7.0 ks	The source is fading with 3.7-σ significance.
Mean XRT rate: 9.2 (±1.7) ×10^-3 ct s^-1 Peak XRT rate: 9.2 (±1.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.09 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.7 (±0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.7 (±0.5) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~1.48×10^-2 [What is this?]
5 [details]	22h 45m 04.56s341.26900°	-29° 45′ 20.4″-29.75568°	7.4′′	Poor	4.1′	7.0 ks
Mean XRT rate: 9 (+6, -4) ×10^-4 ct s^-1 Peak XRT rate: 9 (+6, -4) ×10^-4 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Expected serendipitous sources: ~0.09 [What is this?]
6 [details]	22h 44m 17.37s341.07237°	-29° 45′ 01.2″-29.75033°	7.4′′	Poor	6.3′	7.0 ks
Mean XRT rate: 1.1 (+0.6, -0.4) ×10^-3 ct s^-1 Peak XRT rate: 1.1 (+0.6, -0.4) ×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: ~0.00×10⁺⁰ [What is this?]
7 [details]	22h 45m 14.69s341.31122°	-29° 51′ 48.1″-29.86335°	6.4′′	Poor	9.6′	7.0 ks	Matches SIMBAD source: LP 932-73, 2.3″ away.
Mean XRT rate: 1.5 (+0.7, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 1.5 (+0.7, -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?]
8 [details]	22h 44m 53.50s341.22290°	-29° 54′ 51.4″-29.91429°	7.1′′	Good	10.6′	7.0 ks
Mean XRT rate: 1.6 (+0.8, -0.6) ×10^-3 ct s^-1 Peak XRT rate: 1.6 (+0.8, -0.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.17 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 4.7 (+2.2, -1.7) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 4.7 (+2.2, -1.7) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~2.0 [What is this?]
9 [details]	22h 45m 09.67s341.29029°	-29° 53′ 51.8″-29.89772°	7.4′′	Good	10.7′	7.0 ks
Mean XRT rate: 1.3 (+0.7, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 1.3 (+0.7, -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: ~2.6 [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.