GRB 231220A: Swift observation summary

Mission:	GUANO
GRB RA:	27.321°
GRB Dec:	+77.897°
GRB Err:	5.0 arcmin
T0:	2023-12-20 16:10:17 UT
Galactic:	126.04° +15.38°
Galactic N_H:	1.80× 10²¹ cm^-2
Galactic E(B-V):	0.6100707

Sun distance:	118.88°
Sun angle:	7.97 [hr](East of Sun)
Moon distance:	75.64°
Visibility of this field.

Data analysed so far:

ObsID: 00021638001 with 3.6 ks exposure.
ObsID: 00021638002 with 0.1 ks exposure.

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Sources found so far

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

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from GUANO pos	Exposure	Notes	Vizier
1 [details]	01h 47m 50.75s26.96147°	+77° 54′ 51.2″77.91423°	3.9′′	Good	4.6′	3.6 ks	The source is 3.0-σ above the RASS limit. This source is affected by optical loading. Matches SIMBAD source: HD 10594, 5.1″ away.
Mean XRT rate: 1.8 (±0.3) ×10^-2 ct s^-1 Peak XRT rate: 3.7 (±0.9) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=15.38°

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.