EP250109a / GRB 250109A: Swift observation summary

Mission:	Einstein Probe/WXT
Einstein Probe RA:	88.806°
Einstein Probe Dec:	-12.500°
Einstein Probe Err:	3.0 arcmin
T0:	2025-01-09 06:17:58 UT
Galactic:	218.03° -18.04°
Galactic N_H:	1.68× 10²¹ cm^-2

Sun distance:	139.40°
Sun angle:	10.55 [hr](East of Sun)
Moon distance:	54.54°
Visibility of this field.
First slew:	2025-01-09 09:19:46 UT
First observation:	2025-01-09 09:19:10 UT
First analysis:	2025-01-09 11:51:59 UT

Data analysed so far:

ObsID: 00019015001 with 1.0 ks exposure.
ObsID: 00019015002 with 3.1 ks exposure.

About tiled field analysis.

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

19015 — 4.1 ks of cleaned data taken between 2025-01-09 09:19:40 and 2025-01-10 04:28:25

Find an upper limit.

Sources found so far

So far 6 sources have been found in the XRT data. 1 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Rank³	Dist from Einstein Probe/WXT pos	Exposure	Notes
1 [details]	05h 55m 07.86s88.78275°	-12° 21′ 58.6″-12.36628°	6.8′′	Good	3 (U)	8.1′	4.1 ks
Mean XRT rate: 1.5 (+1.0, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 1.5 (+1.0, -0.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (PSPC count-rate) Products: Light curve \| Spectrum
2 [details]	05h 55m 36.12s88.90051°	-12° 21′ 19.8″-12.35549°	6.9′′	Good	3 (U)	10.3′	4.1 ks
Mean XRT rate: 3.5 (+1.4, -1.1) ×10^-3 ct s^-1 Peak XRT rate: 3.5 (+1.4, -1.1) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 43484081429990.10 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 3.5 (+1.4, -1.1) ×10^-18 ct s^-1 Peak XRT rate converted to PSPC: 3.5 (+1.4, -1.1) ×10^-18 ct s^-1 Mean XRT flux: 2.3 (+1.0, -0.8) ×10^-10 erg cm^-1s^-1 Peak XRT flux: 2.3 (+1.0, -0.8) ×10^-10 erg cm^-1s^-1 Products: Light curve \| Spectrum
3 [details]	05h 55m 13.67s88.80698°	-12° 29′ 44.8″-12.49579°	5.8′′	Good	3 (U)	0.3′	4.1 ks
Mean XRT rate: 2.03 (+1.07, -0.81) ×10^-3 ct s^-1 Peak XRT rate: 2.03 (+1.07, -0.81) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 2.6 (+1.4, -1.1) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 2.6 (+1.4, -1.1) ×10^-3 ct s^-1 Mean XRT flux: 4.7 (+2.5, -1.9) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 4.7 (+2.5, -1.9) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum
4 [details]	05h 55m 22.67s88.84446°	-12° 21′ 45.0″-12.36250°	7.1′′	Good	3 (U)	8.6′	4.1 ks	Matches SIMBAD source: TYC 5356-516-1, 10.1″ away.
Mean XRT rate: 2.35 (+1.19, -0.90) ×10^-3 ct s^-1 Peak XRT rate: 2.35 (+1.19, -0.90) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 5.3 (+2.7, -2.0) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 5.3 (+2.7, -2.0) ×10^-3 ct s^-1 Mean XRT flux: 3.3 (+1.7, -1.3) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 3.3 (+1.7, -1.3) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum
5 [details]	05h 55m 00.75s88.75311°	-12° 27′ 46.3″-12.46287°	6.3′′	Reasonable	3 (U)	3.8′	4.1 ks
Mean XRT rate: 1.6 (+1.0, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 1.6 (+1.0, -0.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (PSPC count-rate) Products: Light curve \| Spectrum
6 [details]	05h 54m 53.26s88.72193°	-12° 34′ 33.8″-12.57605°	6.4′′	Poor	3 (U)	6.7′	4.1 ks
Mean XRT rate: 1.3 (+0.9, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 1.3 (+0.9, -0.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (PSPC count-rate) 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.

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.