GRB 251118A: Swift observation summary

Mission:	Fermi/LAT
GRB RA:	160.083°
GRB Dec:	-34.576°
GRB Err:	10.4 arcmin
T0:	2025-11-18 20:31:30 UT
Galactic:	274.43° +20.94°
Galactic N_H:	6.48× 10²⁰ cm^-2
Galactic E(B-V):	0.07827631

Sun distance:	66.29°
Sun angle:	4.94 [hr](West of Sun)
Moon distance:	52.52°
Visibility of this field.

Data analysed so far:

ObsID: 00021890001 with 3.0 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.

Probable afterglow details

A source was found which matches the afterglow criteria.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from LAT pos	Exposure	Notes	Vizier
1 [details]	10h 40m 01.01s160.00419°	-34° 31′ 21.1″-34.52253°	2.1′′	Good	5.0′	3.0 ks	The source is 5.4-σ above the RASS limit.
Mean XRT rate: 0.482 (±0.021) ct s^-1 Peak XRT rate: 0.98 (±0.17) ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.05 (±0.09) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 4.2 (±0.7) ×10^-11 erg cm^-1s^-1 Products: Light curve \| 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 2SXPS 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 2 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	Notes
1 [details]	10h 40m 01.01s160.00419°	-34° 31′ 21.1″-34.52253°	2.1′′	Good	5.0′	3.0 ks	The source is 5.4-σ above the RASS limit.
Mean XRT rate: 0.482 (±0.021) ct s^-1 Peak XRT rate: 0.98 (±0.17) ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.05 (±0.09) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 4.2 (±0.7) ×10^-11 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
2 [details]	10h 40m 27.37s160.11403°	-34° 28′ 29.4″-34.47483°	7.0′′	Good	6.3′	3.0 ks
Mean XRT rate: 2.6 (+1.5, -1.2) ×10^-3 ct s^-1 Peak XRT rate: 2.6 (+1.5, -1.2) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Products: 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

Select image style: Draggable PNG | JS9.

Magnify image and make scrollable?

FITS image.

Exposure map

Magnify exposure map and make scrollable?

FITS exposure map.