GRB 241228B: Swift observation summary

Mission:	Fermi/GBM
GRB RA:	127.773°
GRB Dec:	+6.848°
GRB Err:	3 arcsec
T0:	2024-12-28 04:13:05 UT
Galactic:	218.30° +25.25°
Galactic N_H:	2.62× 10²⁰ cm^-2
Galactic E(B-V):	0.03276203

Sun distance:	146.30°
Sun angle:	9.96 [hr](West of Sun)
Moon distance:	113.97°
Visibility of this field.

Data analysed so far:

ObsID: 00021750001 with 1.8 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.

About ToO analysis.

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Sources found so far

So far 2 sources have been found in the XRT data. 0 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from Fermi/GBM pos	Exposure
1 [details]	08h 31m 05.49s127.77288°	+06° 50′ 53.6″6.84823°	3.2′′	Good	0.9′′	1.8 ks
Mean XRT rate: 5.7 (±0.7) ×10^-2 ct s^-1 Peak XRT rate: 7.9 (±2.1) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.07 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.9 (±0.4) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 4.1 (±1.1) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
2 [details]	08h 31m 49.44s127.95598°	+06° 46′ 53.5″6.78154°	5.9′′	Good	11.6′	1.8 ks
Mean XRT rate: 8.4 (+3.4, -2.7) ×10^-3 ct s^-1 Peak XRT rate: 8.4 (+3.4, -2.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.07 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.2 (+1.3, -1.0) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 3.2 (+1.3, -1.0) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Enhanced position \| 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.

Image

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FITS image.

Exposure map

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FITS exposure map.