GRB 250217C: Swift observation summary

Mission:	IPN
GRB RA:	122.158°
GRB Dec:	+45.259°
GRB Err:	25.0 arcmin
T0:	2025-02-17 23:54:42 UT
Galactic:	174.56° +32.07°
Galactic N_H:	3.99× 10²⁰ cm^-2
Galactic E(B-V):	0.0457923

Sun distance:	138.27°
Sun angle:	10.06 [hr](East of Sun)
Moon distance:	95.83°
Visibility of this field.
First slew:	2025-02-18 19:20:29 UT
First observation:	2025-02-18 19:19:56 UT
First analysis:	UT

About tiled field analysis.

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

21778 — 363 s of cleaned data taken between 2025-02-18 19:20:25 and 2025-02-18 19:29:43
21779 — 466 s of cleaned data taken between 2025-02-18 19:29:47 and 2025-02-18 19:38:22
21780 — 764 s of cleaned data taken between 2025-02-18 19:38:25 and 2025-02-18 21:10:00
21781 — 438 s of cleaned data taken between 2025-02-18 21:10:03 and 2025-02-18 21:18:39
21782 — 559 s of cleaned data taken between 2025-02-18 22:38:26 and 2025-02-18 22:49:05
21783 — 519 s of cleaned data taken between 2025-02-19 00:16:25 and 2025-02-19 00:26:06
21784 — 383 s of cleaned data taken between 2025-02-19 02:58:25 and 2025-02-19 03:08:09

Find an upper limit.

Sources found so far

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

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from IPN pos	Exposure	Notes
1 [details]	08h 09m 23.14s122.34641°	+45° 00′ 46.4″45.01289°	6.9′′	Good	16.8′	764 s	Matches known X-ray source: 1RXS J080918.1+450029 (from ROSAT/RASSFSC), 56.1″ away.
Mean XRT rate: 1.0 (+0.5, -0.4) ×10^-2 ct s^-1 Peak XRT rate: 1.0 (+0.5, -0.4) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 5.4 (+2.6, -2.0) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 5.4 (+2.6, -2.0) ×10^-13 erg cm^-1s^-1 Products: Spectrum
2 [details]	08h 08m 49.02s122.20424°	+45° 29′ 05.8″45.48495°	7.3′′	Good	13.7′	559 s	Matches known X-ray source: 1RXS J080850.0+452851 (from ROSAT/RASSFSC), 17.7″ away. Matches SIMBAD source: 2MASS J08084907+4529076, 1.7″ away.
Mean XRT rate: 1.7 (+0.8, -0.6) ×10^-2 ct s^-1 Peak XRT rate: 1.7 (+0.8, -0.6) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.4 (+1.6, -1.2) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 3.4 (+1.6, -1.2) ×10^-13 erg cm^-1s^-1 Products: Spectrum
3 [details]	08h 06m 25.29s121.60537°	+45° 06′ 57.8″45.11605°	9.1′′	Good	24.9′	519 s	Matches known X-ray source: 2SXPS J080624.7+450656 (from 2SXPS), 6.1″ away. Matches SIMBAD source: [VV2006c] J080624.8+450701, 6.3″ away.
Mean XRT rate: 1.7 (+0.8, -0.6) ×10^-2 ct s^-1 Peak XRT rate: 1.7 (+0.8, -0.6) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 5.6 (+2.8, -2.1) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 5.6 (+2.8, -2.1) ×10^-13 erg cm^-1s^-1 Products: Spectrum

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.