GRB 190804B: Swift observation summary

Mission:	MAXI
GRB RA:	239.895°
GRB Dec:	-44.773°
GRB Err:	1.0 deg
T0:	2019-08-04 07:57:51 UT
Galactic:	334.44° +6.28°
Galactic N_H:	2.83× 10²¹ cm^-2
Galactic E(B-V):	0.8746212

Sun distance:	113.16°
Sun angle:	7.05 [hr] (East of Sun)
Moon distance:	74.34°
Visibility of this field.
First slew:	2019-08-04 18:17:19 UT
First observation:	2019-08-04 18:13:43 UT
First analysis:	UT

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 tiled field analysis.

So far 6 fields have been scheduled for observations. Data are available and processed for 7 of these. The list gives the exposure time used in source detection. If any individual sources were selected for follow-up observations, the source detection is not repeated for the follow up observations and the table below is not updated.

20916 — 185 s of cleaned data taken between 2019-08-04 18:16:47 and 2019-08-04 18:20:10
20917 — 183 s of cleaned data taken between 2019-08-04 18:20:14 and 2019-08-04 18:23:38
20918 — 183 s of cleaned data taken between 2019-08-04 18:23:41 and 2019-08-04 18:27:04
20919 — 183 s of cleaned data taken between 2019-08-04 18:27:07 and 2019-08-04 18:30:31
20920 — 183 s of cleaned data taken between 2019-08-04 18:30:34 and 2019-08-04 18:33:57
20921 — 183 s of cleaned data taken between 2019-08-04 18:34:00 and 2019-08-04 18:37:23
20922 — 183 s of cleaned data taken between 2019-08-04 18:37:27 and 2019-08-04 18:40:51

An additional 1 field has also been used for follow up observations. These data are not searched for sources, but are used to update the light curves etc of any sources already found.

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 MAXI pos	Exposure
1 [details]	15h 59m 01.53s239.75638°	-44° 38′ 08.1″-44.63557°	2.2′′	Good	10.1′	4.2 ks
Mean XRT rate: 3.0 (±0.3) ×10^-2 ct s^-1 Peak XRT rate: 4.2 (±1.1) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.43 (±0.25) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 3.4 (±0.9) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position Expected serendipitous sources: ~0.03 [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=6.28°
2 [details]	16h 00m 06.02s240.02507°	-44° 46′ 53.9″-44.78165°	3.8′′	Good	5.6′	4.1 ks
Mean XRT rate: 6.2 (+1.9, -1.6) ×10^-3 ct s^-1 Peak XRT rate: 6.2 (+1.9, -1.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Enhanced position

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.