GRB 251202A: Swift observation summary

This is a confirmed GRB (GRB 251202A), the afterglow is source 1 -- please see the GRB results at https://www.swift.ac.uk/xrt_products/03000226 for updated analysis

Mission:	Einstein Probe/WXT
Einstein Probe RA:	122.121°
Einstein Probe Dec:	+40.600°
Einstein Probe Err:	3.1 arcmin
T0:	2025-12-02 01:49:15 UT
Galactic:	179.96° +31.31°
Galactic N_H:	5.42× 10²⁰ cm^-2

Sun distance:	131.06°
Sun angle:	8.40 [hr](West of Sun)
Moon distance:	85.65°
Visibility of this field.
First slew:	2025-12-02 02:25:06 UT
First observation:	2025-12-02 02:24:35 UT
First analysis:	2025-12-02 04:36:35 UT

Data analysed so far:

ObsID: 03000226001 with 0.4 ks exposure.
ObsID: 03000226002 with 0.3 ks exposure.

About tiled field analysis.

So far 1 fields have been scheduled for observations. Data are available and processed for 1 of these.

3000226 — 759 s of cleaned data taken between 2025-12-02 02:25:03 and 2025-12-02 08:29:19

Details of afterglow candidates

1 sources were found which matches the afterglow criteria.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Rank³	Dist from Einstein Probe/WXT pos	Exposure	Notes	Vizier
1 [details]	08h 08m 27.63s122.11512°	+40° 36′ 44.2″40.61228°	2.4′′ ^*	Good	1 (T)	0.8′	759 s	The source is fading with 3.9-σ significance. The source is 5.5-σ above the RASS limit.
Mean XRT rate: 0.54 (±0.06) ct s^-1 Peak XRT rate: 1.04 (±0.18) ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.74 (±0.09) ct s^-1 Peak XRT rate converted to PSPC: 1.44 (±0.25) ct s^-1 Mean XRT flux: 1.83 (+0.22, -0.21) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 3.5 (±0.6) ×10^-11 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position

¹ Radius, 90% confidence.
² Indicates how likely the source is to be real. See the LSXPS documentation.
³ T=Transient Source, O=Outbursting known source, U=Uncatalogued X-ray source, K=Known X-ray source.
^* 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	Rank³	Dist from Einstein Probe/WXT pos	Exposure	Notes
1 [details]	08h 08m 27.63s122.11512°	+40° 36′ 44.2″40.61228°	2.4′′ ^*	Good	1 (T)	0.8′	759 s	The source is fading with 3.9-σ significance. The source is 5.5-σ above the RASS limit.
Mean XRT rate: 0.54 (±0.06) ct s^-1 Peak XRT rate: 1.04 (±0.18) ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.74 (±0.09) ct s^-1 Peak XRT rate converted to PSPC: 1.44 (±0.25) ct s^-1 Mean XRT flux: 1.83 (+0.22, -0.21) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 3.5 (±0.6) ×10^-11 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
2 [details]	08h 08m 26.28s122.10950°	+40° 36′ 40.2″40.61117°	5.9′′ ^*	Poor	3 (U)	0.9′	759 s	The source is fading with 3.8-σ significance. The source is 4.3-σ above the RASS limit. This source may be affected by optical loading
Mean XRT rate: 8.9 (±1.5) ×10^-2 ct s^-1 Peak XRT rate: 0.141 (±0.026) ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.127 (+0.022, -0.021) ct s^-1 Peak XRT rate converted to PSPC: 0.20 (±0.04) ct s^-1 Mean XRT flux: 2.6 (+0.5, -0.4) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 4.2 (±0.8) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position

Image

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Exposure map

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FITS exposure map.