EP250215a / GRB 250215A: Swift observation summary

This is a confirmed GRB (EP250215a/GRB 250215A), the afterglow is source 1 -- please see the GRB results at https://www.swift.ac.uk/xrt_products/00019554 for updated analysis

Mission:	Einstein Probe/WXT
Einstein Probe RA:	156.343°
Einstein Probe Dec:	-27.704°
Einstein Probe Err:	3.0 arcmin
T0:	2025-02-15 02:32:03 UT
Galactic:	267.42° +24.92°
Galactic N_H:	5.43× 10²⁰ cm^-2

Sun distance:	138.85°
Sun angle:	11.48 [hr](West of Sun)
Moon distance:	35.10°
Visibility of this field.
First slew:	2025-02-15 05:06:06 UT
First observation:	2025-02-15 05:05:33 UT
First analysis:	2025-02-15 10:47:54 UT

Data analysed so far:

ObsID: 00019554001 with 1.7 ks exposure.

About tiled field analysis.

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

19554 — 1.7 ks of cleaned data taken between 2025-02-15 05:06:03 and 2025-02-15 06:59:37

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]	10h 25m 19.48s156.33119°	-27° 41′ 54.0″-27.69834°	3.6′′	Good	2 (O)	0.7′	1.7 ks	The source is 4.2-σ above the RASS limit.
Mean XRT rate: 0.345 (±0.019) ct s^-1 Peak XRT rate: 0.54 (±0.12) ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.435 (±0.024) ct s^-1 Peak XRT rate converted to PSPC: 0.68 (±0.15) ct s^-1 Mean XRT flux: 1.21 (±0.07) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 1.9 (±0.4) ×10^-11 erg cm^-1s^-1 Products: Light curve \| Spectrum

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 3 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]	10h 25m 19.48s156.33119°	-27° 41′ 54.0″-27.69834°	3.6′′	Good	2 (O)	0.7′	1.7 ks	The source is 4.2-σ above the RASS limit.
Mean XRT rate: 0.345 (±0.019) ct s^-1 Peak XRT rate: 0.54 (±0.12) ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.435 (±0.024) ct s^-1 Peak XRT rate converted to PSPC: 0.68 (±0.15) ct s^-1 Mean XRT flux: 1.21 (±0.07) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 1.9 (±0.4) ×10^-11 erg cm^-1s^-1 Products: Light curve \| Spectrum
2 [details]	10h 25m 23.88s156.34952°	-27° 38′ 55.3″-27.64871°	7.0′′	Good	3 (U)	3.3′	1.7 ks
Mean XRT rate: 6.2 (+2.8, -2.2) ×10^-3 ct s^-1 Peak XRT rate: 6.2 (+2.8, -2.2) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 2.75 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 1.5 (+0.7, -0.6) ×10^-4 ct s^-1 Peak XRT rate converted to PSPC: 1.5 (+0.7, -0.6) ×10^-4 ct s^-1 Mean XRT flux: 5.5 (+2.5, -2.0) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 5.5 (+2.5, -2.0) ×10^-11 erg cm^-1s^-1 Products: Light curve \| Spectrum
3 [details]	10h 25m 24.96s156.35402°	-27° 41′ 17.2″-27.68811°	5.4′′	Poor	3 (U)	1.1′	1.7 ks
Mean XRT rate: 6.9 (+2.8, -2.2) ×10^-3 ct s^-1 Peak XRT rate: 6.9 (+2.8, -2.2) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 8.0 (+3.2, -2.6) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 8.0 (+3.2, -2.6) ×10^-3 ct s^-1 Mean XRT flux: 3.1 (+1.3, -1.0) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 3.1 (+1.3, -1.0) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum

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Exposure map

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FITS exposure map.