GRB 260206A: Swift observation summary

Mission:	MAXI
GRB RA:	78.311°
GRB Dec:	-40.469°
GRB Err:	30.0 arcmin
T0:	2026-02-06 08:47:33 UT
Galactic:	245.00° -35.26°
Galactic N_H:	4.05× 10²⁰ cm^-2
Galactic E(B-V):	0.03768338

Sun distance:	100.13°
Sun angle:	7.9 [hr](East of Sun)
Moon distance:	101.16°
Visibility of this field.
First slew:	2026-02-06 19:32:36 UT
First observation:	2026-02-06 17:39:07 UT
First analysis:	UT

About tiled field analysis.

So far 7 fields have been scheduled for observations. Data are available and processed for 5 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.

21901 — 478 s of cleaned data taken between 2026-02-06 17:40:07 and 2026-02-06 17:49:58
21902 — 60 s of cleaned data taken between 2026-02-06 17:50:00 and 2026-02-06 17:51:22
21903 — 476 s of cleaned data taken between 2026-02-06 17:51:26 and 2026-02-06 17:59:44
21904 — 376 s of cleaned data taken between 2026-02-06 19:11:59 and 2026-02-06 19:23:21
21906 — 248 s of cleaned data taken between 2026-02-06 19:24:03 and 2026-02-06 19:29:29

Find an upper limit.

Sources found so far

So far 5 sources have been found in the XRT data. 3 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from MAXI pos	Exposure	Notes
1 [details]	05h 14m 06.83s78.52847°	-40° 02′ 36.2″-40.04339°	3.5′′	Good	27.4′	476 s	Matches known X-ray source: LSXPS J051406.5-400237 (from LSXPS), 3.3″ away. Matches SIMBAD source: Cl* NGC 1851 ABK X2 b, 2.4″ away.
Mean XRT rate: 7.3 (±0.3) ct s^-1 Peak XRT rate: 9.9 (±2.1) ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.57 (±0.11) ×10^-10 erg cm^-1s^-1 Peak XRT flux: 3.5 (±0.7) ×10^-10 erg cm^-1s^-1 Products: Light curve \| Spectrum
2 [details]	05h 13m 19.48s78.33115°	-40° 16′ 29.0″-40.27472°	6.4′′	Good	11.7′	955 s	Matches known X-ray source: CXO J051319.2-401626 (from Chandra/2CSC), 3.5″ away. Matches SIMBAD source: LEDA 588240, 4.4″ away.
Mean XRT rate: 1.6 (+0.6, -0.5) ×10^-2 ct s^-1 Peak XRT rate: 1.6 (+0.6, -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: 5.8 (+2.3, -1.8) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 5.8 (+2.3, -1.8) ×10^-13 erg cm^-1s^-1 Products: Spectrum
3 [details]	05h 13m 56.13s78.48389°	-40° 31′ 51.8″-40.53106°	6.7′′	Reasonable	8.7′	478 s
Mean XRT rate: 1.2 (+0.8, -0.5) ×10^-2 ct s^-1 Peak XRT rate: 1.2 (+0.8, -0.5) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Products: Spectrum
4 [details]	05h 13m 51.66s78.46523°	-40° 02′ 52.5″-40.04791°	25.9′′	Poor	26.2′	476 s	Matches SIMBAD source: 2MASS J05135112-4002369, 16.4″ away.
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.65 ct s^-1 (XRT equiv count-rate) Products: Spectrum
5 [details]	05h 13m 17.53s78.32305°	-40° 43′ 59.9″-40.73331°	8.1′′	Poor	15.9′	376 s
Mean XRT rate: 1.3 (+1.0, -0.7) ×10^-2 ct s^-1 Peak XRT rate: 1.3 (+1.0, -0.7) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate)

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.