GRB 260111A: Swift observation summary

Mission:	Swift/BAT
GRB RA:	229.573°
GRB Dec:	+51.975°
GRB Err:	5.0 arcmin
T0:	2026-01-11 16:33:14 UT
Galactic:	85.20° +53.00°
Galactic N_H:	1.69× 10²⁰ cm^-2
Galactic E(B-V):	0.01727543

Sun distance:	91.99°
Sun angle:	4.23 [hr](West of Sun)
Moon distance:	70.47°
Visibility of this field.

Data analysed so far:

ObsID: 00021897001 with 2.8 ks exposure.
ObsID: 00021897002 with 2.7 ks exposure.

About ToO analysis.

Find an upper limit.

Sources found so far

So far 4 sources have been found in the XRT data. 3 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from Swift/BAT pos	Exposure	Notes
1 [details]	15h 18m 32.81s229.63669°	+51° 54′ 56.1″51.91558°	3.3′′	Good	4.3′	6.5 ks	Matches known X-ray source: LSXPS J151832.6+515455 (from LSXPS), 3.1″ away. Matches SIMBAD source: 2MASS J15183280+5154570, 4.8″ away.
Mean XRT rate: 1.56 (±0.18) ×10^-2 ct s^-1 Peak XRT rate: 2.0 (±0.5) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 4.5 (±0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 6.0 (±1.5) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
2 [details]	15h 18m 20.60s229.58581°	+51° 58′ 24.8″51.97356°	6.3′′	Good	0.5′	6.5 ks
Mean XRT rate: 5.2 (+2.3, -1.9) ×10^-3 ct s^-1 Peak XRT rate: 5.2 (+2.3, -1.9) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 7.7×10^-3 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.7 (+0.8, -0.6) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.7 (+0.8, -0.6) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
3 [details]	15h 18m 40.45s229.66854°	+52° 07′ 30.2″52.12506°	6.2′′	Reasonable	9.7′	6.5 ks	Matches known X-ray source: LSXPS J151840.4+520725 (from LSXPS), 4.3″ away.
Mean XRT rate: 2.38 (+1.28, -0.97) ×10^-3 ct s^-1 Peak XRT rate: 2.38 (+1.28, -0.97) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.1 (+0.6, -0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.1 (+0.6, -0.5) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
4 [details]	15h 18m 26.69s229.61120°	+51° 49′ 55.3″51.83204°	5.9′′	Poor	8.7′	6.5 ks	Matches known X-ray source: LSXPS J151826.4+514951 (from LSXPS), 4.9″ away. Matches SIMBAD source: LSPM J1518+5149, 7″ away.
Mean XRT rate: 3.08 (+1.08, -0.83) ×10^-3 ct s^-1 Peak XRT rate: 3.3 (+1.7, -1.3) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.2 (+0.4, -0.3) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.3 (+0.7, -0.5) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| 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.