GRB 221006A: Swift observation summary

Mission:	MAXI
GRB RA:	337.328°
GRB Dec:	+15.703°
GRB Err:	15.0 arcmin
T0:	2022-10-06 00:57:09 UT
Galactic:	79.84° -35.02°
Galactic N_H:	4.95× 10²⁰ cm^-2
Galactic E(B-V):	0.06494494

Sun distance:	144.81°
Sun angle:	9.72 [hr] (East of Sun)
Moon distance:	36.04°
Visibility of this field.

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 3 fields have been scheduled for observations. Data are available and processed for 3 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.

21521 — 659 s of cleaned data taken between 2022-10-06 11:24:36 and 2022-10-06 11:38:21
21522 — 596 s of cleaned data taken between 2022-10-06 11:38:25 and 2022-10-06 11:49:48
21523 — 656 s of cleaned data taken between 2022-10-06 11:49:49 and 2022-10-06 12:01:10

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.

Probable afterglow details

A source was found which matches the afterglow criteria.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from MAXI pos	Exposure	Notes	Vizier
2 [details]	22h 28m 58.99s337.24578°	+15° 42′ 49.6″15.71379°	3.1′′	Good	4.8′	3.2 ks	The source is fading with 5.0-σ significance.
Mean XRT rate: 4.0 (+0.8, -0.7) ×10^-2 ct s^-1 Peak XRT rate: 4.2 (±1.0) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.67 (+0.32, -0.29) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 1.8 (±0.4) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| 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.

Find an upper limit.

Sources found so far

So far 3 sources have been found in the XRT data. 1 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from MAXI pos	Exposure	Notes
1 [details]	22h 29m 24.58s337.35242°	+15° 38′ 02.8″15.63412°	12.1′′	Reasonable	4.4′	2.1 ks
Mean XRT rate: 1.0 (+0.6, -0.5) ×10^-2 ct s^-1 Peak XRT rate: 1.0 (+0.6, -0.5) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate) Products: Spectrum
2 [details]	22h 28m 58.99s337.24578°	+15° 42′ 49.6″15.71379°	3.1′′	Good	4.8′	3.2 ks	The source is fading with 5.0-σ significance.
Mean XRT rate: 4.0 (+0.8, -0.7) ×10^-2 ct s^-1 Peak XRT rate: 4.2 (±1.0) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.67 (+0.32, -0.29) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 1.8 (±0.4) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
3 [details]	22h 29m 23.07s337.34614°	+15° 41′ 38.6″15.69405°	8.2′′	Poor	1.2′	3.2 ks	Matches SIMBAD source: SDSS J222922.60+154138.8, 6.7″ away.
Mean XRT rate: 1.1 (+0.4, -0.3) ×10^-2 ct s^-1 Peak XRT rate: 1.1 (+0.4, -0.3) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.0 (+0.8, -0.6) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.0 (+0.8, -0.6) ×10^-13 erg cm^-1s^-1 Products: Spectrum

Image

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FITS image.

Exposure map

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FITS exposure map.