GRB 210901B: Swift observation summary

Mission:	ZTF
GRB RA:	250.214°
GRB Dec:	+17.530°
GRB Err:	0.6 arcsec
T0:	2021-09-01 00:01:00 UT
Galactic:	35.32° +36.52°
Galactic N_H:	5.16× 10²⁰ cm^-2
Galactic E(B-V):	0.08071461

Sun distance:	87.34°
Sun angle:	5.99 [hr] (East of Sun)
Moon distance:	134.21°
Visibility of this field.

Data analysed so far:

ObsID: 00021462001 with 4.4 ks exposure.

About ToO analysis.

Find an upper limit.

Sources found so far

So far 9 sources have been found in the XRT data. 0 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from ZTF pos	Exposure
1 [details]	16h 40m 41.47s250.17279°	+17° 40′ 05.5″17.66820°	5.9′′	Good	8.6′	1.2 ks
Mean XRT rate: 1.8 (+2.5, -1.8) ×10^-3 ct s^-1 Peak XRT rate: 1.8 (+2.5, -1.8) ×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 \| Expected serendipitous sources: ~1.0 [What is this?]
2 [details]	16h 40m 51.26s250.21360°	+17° 31′ 50.1″17.53059°	3.5′′	Good	2.5′′	1.2 ks
Mean XRT rate: 9 (±4) ×10^-3 ct s^-1 Peak XRT rate: 9 (±4) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.1 (+1.6, -1.3) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 3.1 (+1.6, -1.3) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~3.10×10^-6 [What is this?]
3 [details]	16h 40m 43.30s250.18042°	+17° 32′ 22.3″17.53954°	11.0′′	Poor	2.0′	0 s
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate) Products: Expected serendipitous sources: ~0.05 [What is this?]
4 [details]	16h 41m 01.66s250.25691°	+17° 28′ 34.0″17.47611°	9.6′′	Good	4.1′	1.2 ks
Mean XRT rate: 1.7 (±0.5) ×10^-2 ct s^-1 Peak XRT rate: 1.7 (±0.5) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.06 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 7.6 (±2.4) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 7.6 (±2.4) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~1.04×10^-2 [What is this?]
5 [details]	16h 40m 40.90s250.17040°	+17° 26′ 21.0″17.43916°	7.9′′	Good	6.0′	1.2 ks
Mean XRT rate: 8 (+4, -3) ×10^-3 ct s^-1 Peak XRT rate: 8 (+4, -3) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.17 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 8 (+4, -3) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 8 (+4, -3) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.06 [What is this?]
6 [details]	16h 40m 47.07s250.19611°	+17° 35′ 36.1″17.59335°	8.8′′	Poor	3.9′	1.2 ks
Mean XRT rate: 5.5 (+3.8, -3.0) ×10^-3 ct s^-1 Peak XRT rate: 5.5 (+3.8, -3.0) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.52 (+1.04, -0.83) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.52 (+1.04, -0.83) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.05 [What is this?]
7 [details]	16h 40m 42.82s250.17843°	+17° 27′ 48.3″17.46340°	8.9′′	Poor	4.5′	0 s
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Products: Expected serendipitous sources: ~0.2 [What is this?]
8 [details]	16h 41m 24.34s250.35141°	+17° 34′ 11.0″17.56973°	5.3′′	Reasonable	8.2′	0 s
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.02 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: ~0.5 [What is this?]
9 [details]	16h 41m 05.79s250.27413°	+17° 31′ 44.2″17.52895°	8.6′′	Poor	3.4′	1.2 ks
Mean XRT rate: 2.8 (+2.9, -2.1) ×10^-3 ct s^-1 Peak XRT rate: 2.8 (+2.9, -2.1) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 4 (+4, -3) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 4 (+4, -3) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [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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FITS exposure map.