GRB 230827B: Swift observation summary

Mission:	Fermi/GBM
GRB RA:	299.640°
GRB Dec:	+54.463°
GRB Err:	6 arcsec
T0:	2023-08-27 06:08:31 UT
Galactic:	88.13° +12.81°
Galactic N_H:	1.91× 10²¹ cm^-2
Galactic E(B-V):	0.2484096

Sun distance:	108.64°
Sun angle:	9.61 [hr] (East of Sun)
Moon distance:	83.98°
Visibility of this field.

Data analysed so far:

ObsID: 00021620001 with 3.6 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.

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Sources found so far

So far 6 sources have been found in the XRT data. 1 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from Fermi/GBM pos	Exposure	Notes
1 [details]	19h 58m 33.47s299.63944°	+54° 27′ 47.4″54.46318°	2.6′′	Good	1.3′′	3.6 ks
Mean XRT rate: 7.1 (±0.5) ×10^-2 ct s^-1 Peak XRT rate: 9.4 (±2.4) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.71 (±0.27) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 4.9 (±1.2) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=12.81°
2 [details]	19h 57m 33.68s299.39035°	+54° 25′ 59.7″54.43324°	7.4′′	Poor	8.9′	3.6 ks	Matches SIMBAD source: TYC 3939-162-1, 1.5″ away.
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: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=12.81°
3 [details]	19h 58m 59.47s299.74779°	+54° 39′ 51.8″54.66438°	6.8′′	Good	12.7′	3.1 ks
Mean XRT rate: 4.0 (+1.9, -1.5) ×10^-3 ct s^-1 Peak XRT rate: 4.0 (+1.9, -1.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 7.6×10^-3 ct s^-1 (XRT equiv count-rate) Products: Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=12.81°
4 [details]	19h 58m 09.54s299.53974°	+54° 33′ 04.6″54.55127°	6.2′′	Poor	6.3′	3.6 ks
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: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=12.81°
5 [details]	19h 57m 09.12s299.28798°	+54° 28′ 24.6″54.47349°	5.6′′	Poor	12.3′	3.6 ks
Mean XRT rate: 3.1 (+1.6, -1.2) ×10^-3 ct s^-1 Peak XRT rate: 3.1 (+1.6, -1.2) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate) Products: Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=12.81°
6 [details]	19h 58m 22.97s299.59571°	+54° 20′ 41.9″54.34496°	5.5′′	Good	7.2′	3.6 ks
Mean XRT rate: 3.5 (+1.6, -1.2) ×10^-3 ct s^-1 Peak XRT rate: 3.5 (+1.6, -1.2) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 8.7×10^-3 ct s^-1 (XRT equiv count-rate) Products: Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=12.81°

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 image.

Exposure map

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FITS exposure map.