GRB 190731A: Swift observation summary

Mission:	Fermi/LAT
GRB RA:	339.940°
GRB Dec:	-76.620°
GRB Err:	15.0 arcmin
T0:	2019-07-31 22:37:59 UT
Galactic:	312.12° -38.06°
Galactic N_H:	6.94× 10²⁰ cm^-2
Galactic E(B-V):	0.1173819

Sun distance:	119.69°
Sun angle:	10.06 [hr] (West of Sun)
Moon distance:	121.64°
Visibility of this field.

Data analysed so far:

ObsID: 00020914001 with 1.6 ks exposure.
ObsID: 00020914002 with 3.4 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 LAT pos	Exposure	Notes	Vizier
1 [details]	22h 38m 52.84s339.72015°	-76° 34′ 38.8″-76.57744°	2.2′′	Good	4.0′	5.0 ks	The source is fading with 3.1-σ significance.
Mean XRT rate: 3.23 (+0.30, -0.29) ×10^-2 ct s^-1 Peak XRT rate: 5.2 (±1.1) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.09 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.06 (±0.10) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 1.7 (±0.4) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.03 [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 11 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]	22h 38m 52.84s339.72015°	-76° 34′ 38.8″-76.57744°	2.2′′	Good	4.0′	5.0 ks	The source is fading with 3.1-σ significance.
Mean XRT rate: 3.23 (+0.30, -0.29) ×10^-2 ct s^-1 Peak XRT rate: 5.2 (±1.1) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.09 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.06 (±0.10) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 1.7 (±0.4) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.03 [What is this?]
2 [details]	22h 37m 14.53s339.31054°	-76° 37′ 19.2″-76.62201°	12.7′′	Good	8.7′	5.0 ks
Mean XRT rate: 3.7 (+1.3, -1.0) ×10^-3 ct s^-1 Peak XRT rate: 3.7 (+1.3, -1.0) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 5.2 (+1.8, -1.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 5.2 (+1.8, -1.5) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.9 [What is this?]
3 [details]	22h 39m 35.61s339.89837°	-76° 46′ 41.9″-76.77829°	13.2′′	Poor	9.5′	5.0 ks
Mean XRT rate: 1.5 (+0.9, -0.6) ×10^-3 ct s^-1 Peak XRT rate: 1.5 (+0.9, -0.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 9.2×10^-10 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 4.2 (+2.4, -1.8) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 4.2 (+2.4, -1.8) ×10^-11 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~2.3 [What is this?]
4 [details]	22h 40m 31.87s340.13277°	-76° 42′ 28.6″-76.70794°	14.1′′	Poor	5.9′	5.0 ks
Mean XRT rate: 1.3 (+0.8, -0.6) ×10^-3 ct s^-1 Peak XRT rate: 1.3 (+0.8, -0.6) ×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: ~0.8 [What is this?]
5 [details]	22h 37m 03.27s339.26363°	-76° 28′ 46.0″-76.47943°	14.7′′	Good	12.7′	3.0 ks
Mean XRT rate: 2.8 (+1.6, -1.1) ×10^-3 ct s^-1 Peak XRT rate: 2.8 (+1.6, -1.1) ×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: ~1.3 [What is this?]
6 [details]	22h 40m 38.90s340.16210°	-76° 37′ 43.8″-76.62882°	12.8′′	Good	3.1′	5.0 ks
Mean XRT rate: 2.1 (+1.0, -0.8) ×10^-3 ct s^-1 Peak XRT rate: 2.1 (+1.0, -0.8) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.07 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: Light curve \| Spectrum \| Expected serendipitous sources: ~1.8 [What is this?]
7 [details]	22h 36m 27.83s339.11595°	-76° 32′ 50.9″-76.54748°	12.1′′	Good	12.3′	3.9 ks
Mean XRT rate: 3.1 (+1.3, -1.0) ×10^-3 ct s^-1 Peak XRT rate: 3.1 (+1.3, -1.0) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.09 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 8.7 (+3.7, -2.9) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 8.7 (+3.7, -2.9) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~1.1 [What is this?]
8 [details]	22h 38m 16.61s339.56919°	-76° 42′ 42.5″-76.71181°	12.4′′	Good	7.5′	5.0 ks
Mean XRT rate: 2.1 (+0.9, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 2.1 (+0.9, -0.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.14 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 4.3 (+1.9, -1.5) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 4.3 (+1.9, -1.5) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~1.8 [What is this?]
9 [details]	22h 39m 50.05s339.95855°	-76° 38′ 06.2″-76.63504°	10.5′′	Good	0.9′	5.0 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: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 10 (+5, -4) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 10 (+5, -4) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
10 [details]	22h 39m 47.38s339.94741°	-76° 41′ 02.4″-76.68399°	15.8′′	Good	3.8′	5.0 ks
Mean XRT rate: 1.8 (+0.9, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 1.8 (+0.9, -0.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.07 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 4.8 (+2.3, -1.8) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 4.8 (+2.3, -1.8) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~2.1 [What is this?]
11 [details]	22h 42m 32.27s340.63447°	-76° 44′ 36.0″-76.74333°	21.6′′	Poor	12.1′	0 s
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate)

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.