GRB 231222B: Swift observation summary

Mission:	Fermi/LAT
GRB RA:	251.350°
GRB Dec:	+19.500°
GRB Err:	18.0 arcmin
T0:	2023-12-22 07:26:02 UT
Galactic:	38.08° +36.20°
Galactic N_H:	5.69× 10²⁰ cm^-2
Galactic E(B-V):	0.08287723

Sun distance:	46.57°
Sun angle:	1.24 [hr](West of Sun)
Moon distance:	127.69°
Visibility of this field.
First slew:	2023-12-22 19:24:28 UT
First observation:	2023-12-22 19:23:53 UT
First analysis:	UT

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.

About tiled field analysis.

So far 4 fields have been scheduled for observations. Data are available and processed for 4 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.

21639 — 824 s of cleaned data taken between 2023-12-22 19:24:26 and 2023-12-22 20:43:36
21640 — 1.1 ks of cleaned data taken between 2023-12-22 20:51:04 and 2023-12-22 21:12:05
21641 — 1.2 ks of cleaned data taken between 2023-12-22 22:14:43 and 2023-12-22 22:38:37
21642 — 992 s of cleaned data taken between 2023-12-22 23:52:46 and 2023-12-23 00:16:16

Find an upper limit.

Sources found so far

So far 3 sources have been found in the XRT data. 0 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from LAT pos	Exposure
1 [details]	16h 44m 59.40s251.24749°	+19° 37′ 15.1″19.62085°	3.3′′	Good	9.3′	2.1 ks
Mean XRT rate: 5.6 (±0.7) ×10^-2 ct s^-1 Peak XRT rate: 8.6 (±2.2) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.83 (±0.22) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 2.8 (±0.7) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
2 [details]	16h 44m 35.54s251.14807°	+19° 33′ 15.6″19.55432°	7.9′′	Reasonable	11.9′	824 s
Mean XRT rate: 9 (+5, -4) ×10^-3 ct s^-1 Peak XRT rate: 9 (+5, -4) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.9 (+1.6, -1.2) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.9 (+1.6, -1.2) ×10^-13 erg cm^-1s^-1 Products: Spectrum
3 [details]	16h 44m 30.83s251.12846°	+19° 41′ 27.2″19.69090°	22.3′′	Poor	17.0′	1.3 ks
Mean XRT rate: 6.3 (+3.6, -2.6) ×10^-3 ct s^-1 Peak XRT rate: 6.3 (+3.6, -2.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 5.5×10^-3 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.5 (+0.8, -0.6) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.5 (+0.8, -0.6) ×10^-13 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.