GRB 210826A: Swift observation summary

Mission:	Fermi/LAT
GRB RA:	45.300°
GRB Dec:	-71.700°
GRB Err:	12.0 arcmin
T0:	2021-08-26 07:01:45 UT
Galactic:	289.84° -41.97°
Galactic N_H:	4.12× 10²⁰ cm^-2
Galactic E(B-V):	0.03116004

Sun distance:	105.96°
Sun angle:	7.33 [hr](West of Sun)
Moon distance:	77.64°
Visibility of this field.

About tiled field analysis.

So far 1 fields have been scheduled for observations. Data are available and processed for 1 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.

21460 — 4.9 ks of cleaned data taken between 2021-08-26 17:10:34 and 2021-08-26 20:50:19

Find an upper limit.

Sources found so far

So far 9 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]	03h 01m 20.66s45.33607°	-71° 42′ 25.8″-71.70716°	8.7′′	Poor	0.8′	0 s
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.38 ct s^-1 (XRT equiv count-rate)
2 [details]	03h 00m 22.93s45.09553°	-71° 39′ 11.1″-71.65308°	5.0′′	Good	4.8′	0 s
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.40 ct s^-1 (XRT equiv count-rate) Mean XRT flux: undetermined erg cm^-1s^-1 Peak XRT flux: undetermined erg cm^-1s^-1 Products: Spectrum \| Enhanced position Expected serendipitous sources: ~0.9 [What is this?]
3 [details]	03h 02m 14.12s45.55885°	-71° 54′ 11.4″-71.90318°	9.9′′	Good	13.1′	1.7 ks	The source is 3.8-σ above the 2SPXS limit. This source is affected by optical loading. Matches SIMBAD source: * tet Hyi, 6.7″ away.
Mean XRT rate: 8.5 (+3.7, -2.9) ×10^-3 ct s^-1 Peak XRT rate: 8.5 (+3.7, -2.9) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.36 ct s^-1 (XRT equiv count-rate) Products: Light curve Expected serendipitous sources: ~0.3 [What is this?]
4 [details]	03h 00m 43.67s45.18197°	-71° 34′ 15.8″-71.57106°	9.7′′	Reasonable	8.1′	0 s
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.84 ct s^-1 (XRT equiv count-rate) Mean XRT flux: undetermined erg cm^-1s^-1 Peak XRT flux: undetermined erg cm^-1s^-1 Products: Spectrum Expected serendipitous sources: ~1.6 [What is this?]
5 [details]	03h 01m 55.54s45.48141°	-71° 39′ 16.4″-71.65456°	5.0′′	Good	4.4′	0 s
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.37 ct s^-1 (XRT equiv count-rate) Mean XRT flux: undetermined erg cm^-1s^-1 Peak XRT flux: undetermined erg cm^-1s^-1 Products: Spectrum \| Enhanced position Expected serendipitous sources: ~0.8 [What is this?]
6 [details]	03h 00m 44.41s45.18504°	-71° 47′ 00.9″-71.78358°	10.0′′	Reasonable	5.5′	0 s
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.33 ct s^-1 (XRT equiv count-rate) Mean XRT flux: undetermined erg cm^-1s^-1 Peak XRT flux: undetermined erg cm^-1s^-1 Products: Spectrum Expected serendipitous sources: ~2.1 [What is this?]
7 [details]	03h 01m 28.39s45.36828°	-71° 39′ 42.1″-71.66170°	10.3′′	Poor	2.6′	0 s
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.35 ct s^-1 (XRT equiv count-rate)
8 [details]	02h 59m 09.68s44.79032°	-71° 36′ 40.2″-71.61116°	9.3′′	Poor	11.0′	0 s	Matches SIMBAD source: 2MASX J02591150-7136430, 9.1″ away.
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.29 ct s^-1 (XRT equiv count-rate) Products: Spectrum
9 [details]	03h 02m 44.02s45.68342°	-71° 39′ 26.7″-71.65742°	8.8′′	Good	7.7′	0 s
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 9.66 ct s^-1 (XRT equiv count-rate) Mean XRT flux: undetermined erg cm^-1s^-1 Peak XRT flux: undetermined erg cm^-1s^-1 Products: Spectrum

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.