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NEUTRINO_FIELD00043

NEUTRINO

43

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IceCube-250406A: Swift observation summary

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About tiled field analysis.

So far 6 fields have been scheduled for observations. Data are available and processed for 6 of these.

• 19685 — 699 s of cleaned data taken between 2025-04-07 22:21:28 and 2025-04-07 22:35:46
• 19693 — 900 s of cleaned data taken between 2025-04-07 22:35:50 and 2025-04-08 03:11:27
• 19694 — 707 s of cleaned data taken between 2025-04-08 03:11:31 and 2025-04-08 03:23:39
• 19695 — 428 s of cleaned data taken between 2025-04-07 23:55:08 and 2025-04-08 00:10:22
• 19696 — 707 s of cleaned data taken between 2025-04-08 00:10:26 and 2025-04-08 00:22:34
• 19697 — 707 s of cleaned data taken between 2025-04-08 03:23:42 and 2025-04-08 03:35:52

5 fields were processed but not included in the analysis. This is because, after standard processing and the removal of times contaminated by light reflected off the bright Earth, there was too little data (<100 s) for source detection to be performed.

Find an upper limit.

Sources found so far

So far 4 sources have been found in the XRT data. 3 sources match catalogued sources.

Coordinate type: SexagesimalDecimal

#	RA (J2000)	Dec (J2000)	Err901	Detection Flag2	Rank3	Dist from IceCube pos	Exposure	Notes	Vizier
1 [details]	05h 24m 56.10s81.23375°	+17° 03′ 57.8″17.06605°	4.7′′	Good	4 (K)	15.0′	1.1 ks	Matches SIMBAD source: 1RXS J052456.3+170400, 0.9″ away. Matches known X-ray source: 1RXS J052456.3+170400 (from ROSAT/RASSFSC), 3.92798647643192″ away.
Mean XRT rate: 3.0 (±0.7) ×10-2 ct s-1 Peak XRT rate: 3.0 (±0.7) ×10-2 ct s-1 0.30 σ below the catalogued flux from ROSAT/RASSFSC. RASS PSPC 3-σ upper limit: 0.0×100 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.053 (±0.013) ct s-1 Peak XRT rate converted to PSPC: 0.053 (±0.013) ×10-2 ct s-1 Mean XRT flux: 5.8 (±1.4) ×10-13 erg cm-1s-1 Peak XRT flux: 5.8 (±1.4) ×10-13 erg cm-1s-1 Products: Light curve | Spectrum
2 [details]	05h 24m 27.12s81.11301°	+17° 23′ 23.2″17.38977°	5.1′′	Good	4 (K)	32.9′	428 s	This source may be affected by optical loading Matches known X-ray source: 1RXS J052425.7+172301 (from ROSAT/RASSBSC), 30.1150612850638″ away.
Mean XRT rate: 5.1 (+1.6, -1.3) ×10-2 ct s-1 Peak XRT rate: 5.1 (+1.6, -1.3) ×10-2 ct s-1 21.72 σ below the catalogued flux from ROSAT/RASSBSC. RASS PSPC 3-σ upper limit: 0.0×100 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.092 (+0.030, -0.024) ct s-1 Peak XRT rate converted to PSPC: 0.092 (+0.030, -0.024) ×10-2 ct s-1 Mean XRT flux: 8.7 (+2.8, -2.3) ×10-13 erg cm-1s-1 Peak XRT flux: 8.7 (+2.8, -2.3) ×10-13 erg cm-1s-1 Products: Light curve | Spectrum
3 [details]	05h 24m 25.16s81.10483°	+17° 22′ 40.9″17.37803°	8.0′′	Good	4 (K)	32.7′	428 s	This source may be affected by optical loading Matches SIMBAD source: * 111 Tau, 20.3″ away. Matches known X-ray source: 1RXS J052425.7+172301 (from ROSAT/RASSBSC), 21.5317342425306″ away.
Mean XRT rate: 4.2 (+1.5, -1.2) ×10-2 ct s-1 Peak XRT rate: 4.2 (+1.5, -1.2) ×10-2 ct s-1 15.95 σ below the catalogued flux from ROSAT/RASSBSC. RASS PSPC 3-σ upper limit: 0.0×100 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 4.7 (+1.6, -1.3) ct s-1 Peak XRT rate converted to PSPC: 4.7 (+1.6, -1.3) ×10-4 ct s-1 Mean XRT flux: 5.5 (+2.0, -1.6) ×10-9 erg cm-1s-1 Peak XRT flux: 5.5 (+2.0, -1.6) ×10-9 erg cm-1s-1 Products: Light curve | Spectrum
4 [details]	05h 24m 40.82s81.17009°	+16° 32′ 36.4″16.54345°	8.4′′	Poor	3 (U)	30.4′	900 s
Mean XRT rate: 8 (+5, -3) ×10-3 ct s-1 Peak XRT rate: 8 (+5, -3) ×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.

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