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Home > Neutrino follow up > ICECUBEJ1744.0+3858

NEUTRINO_FIELD00044

NEUTRINO

44

/neutrino

ICECUBEJ1744.0+3858: Swift observation summary

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About tiled field analysis.

So far 10 fields have been scheduled for observations. Data are available and processed for 10 of these.

• 19914 — 559 s of cleaned data taken between 2025-07-07 02:18:25 and 2025-07-07 02:30:09
• 19915 — 446 s of cleaned data taken between 2025-07-07 02:30:12 and 2025-07-07 02:38:46
• 19916 — 478 s of cleaned data taken between 2025-07-07 05:12:37 and 2025-07-07 05:22:27
• 19917 — 491 s of cleaned data taken between 2025-07-07 05:22:30 and 2025-07-07 05:31:05
• 19918 — 398 s of cleaned data taken between 2025-07-07 03:39:53 and 2025-07-07 03:48:29
• 19919 — 586 s of cleaned data taken between 2025-07-07 02:38:49 and 2025-07-07 03:53:48
• 19920 — 476 s of cleaned data taken between 2025-07-07 03:53:53 and 2025-07-07 04:02:31
• 19921 — 453 s of cleaned data taken between 2025-07-07 04:02:32 and 2025-07-07 04:11:11
• 19922 — 576 s of cleaned data taken between 2025-07-07 04:11:14 and 2025-07-07 05:36:20
• 19923 — 488 s of cleaned data taken between 2025-07-07 05:36:28 and 2025-07-07 05:45:07

9 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 7 sources have been found in the XRT data. 4 sources match catalogued sources.

Coordinate type: SexagesimalDecimal

#	RA (J2000)	Dec (J2000)	Err901	Detection Flag2	Rank3	Dist from IceCube pos	Exposure	Notes	Vizier
1 [details]	17h 45m 45.66s266.44025°	+39° 01′ 22.5″39.02293°	6.2′′	Good	3 (U)	20.8′	935 s
Mean XRT rate: 1.7 (+0.6, -0.5) ×10-2 ct s-1 Peak XRT rate: 1.7 (+0.6, -0.5) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.01 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.040 (+0.015, -0.012) ct s-1 Peak XRT rate converted to PSPC: 0.040 (+0.015, -0.012) ×10-2 ct s-1 Mean XRT flux: 3.6 (+1.4, -1.1) ×10-13 erg cm-1s-1 Peak XRT flux: 3.6 (+1.4, -1.1) ×10-13 erg cm-1s-1 Products: Light curve | Spectrum
2 [details]	17h 45m 54.04s266.47517°	+38° 52′ 50.0″38.88056°	5.8′′	Reasonable	3 (U)	22.8′	1.1 ks	This source may be affected by optical loading Matches SIMBAD source: HD 161815, 4.8″ away.
Mean XRT rate: 1.0 (+0.7, -0.5) ×10-2 ct s-1 Peak XRT rate: 1.0 (+0.7, -0.5) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 9.1×10-3 ct s-1 (PSPC count-rate) Products: Light curve
3 [details]	17h 42m 45.50s265.68958°	+38° 59′ 38.1″38.99391°	4.6′′	Good	3 (U)	14.5′	559 s	This source may be affected by optical loading
Mean XRT rate: 4.3 (±1.0) ×10-2 ct s-1 Peak XRT rate: 4.3 (±1.0) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.08 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.095 (±0.023) ct s-1 Peak XRT rate converted to PSPC: 0.095 (±0.023) ×10-2 ct s-1 Products: Light curve
4 [details]	17h 42m 43.69s265.68202°	+39° 00′ 19.9″39.00553°	9.3′′	Good	3 (U)	15.0′	559 s	This source may be affected by optical loading Matches SIMBAD source: B2 1741+39, 9.1″ away.
Mean XRT rate: 3.70 (+1.15, -0.96) ×10-2 ct s-1 Peak XRT rate: 3.70 (+1.15, -0.96) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 186.32 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 2.2 (+0.7, -0.6) ct s-1 Peak XRT rate converted to PSPC: 2.2 (+0.7, -0.6) ×10-5 ct s-1 Mean XRT flux: 2.9 (+0.9, -0.7) ×10-9 erg cm-1s-1 Peak XRT flux: 2.9 (+0.9, -0.7) ×10-9 erg cm-1s-1 Products: Light curve | Spectrum
5 [details]	17h 42m 47.75s265.69897°	+39° 00′ 47.3″39.01314°	9.0′′	Poor	4 (K)	14.3′	559 s	Matches SIMBAD source: MCXC J1742.8+3900, 13.9″ away. Matches known X-ray source: 1RXS J174248.6+390027 (from ROSAT/RASSBSC), 22.6046819809179″ 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 -1.27 σ above 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: 0.031 (+0.014, -0.011) ct s-1 Peak XRT rate converted to PSPC: 0.031 (+0.014, -0.011) ×10-2 ct s-1 Mean XRT flux: 4.5 (+2.0, -1.6) ×10-12 erg cm-1s-1 Peak XRT flux: 4.5 (+2.0, -1.6) ×10-12 erg cm-1s-1 Products: Light curve | Spectrum
6 [details]	17h 42m 47.43s265.69762°	+38° 59′ 54.6″38.99849°	42.7′′ *	Poor	4 (K)	14.2′	559 s	This source may be affected by optical loading Matches known X-ray source: 1RXS J174248.6+390027 (from ROSAT/RASSBSC), 33.5990189636417″ 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 -1.81 σ above 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: 0.0224 (+0.0102, -0.0079) ct s-1 Peak XRT rate converted to PSPC: 0.0224 (+0.0102, -0.0079) ×10-2 ct s-1 Mean XRT flux: 1.3 (+0.6, -0.5) ×10-11 erg cm-1s-1 Peak XRT flux: 1.3 (+0.6, -0.5) ×10-11 erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position
7 [details]	17h 42m 11.96s265.54984°	+38° 58′ 12.7″38.97021°	8.2′′	Poor	3 (U)	21.0′	1.1 ks
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 9.3×10-3 ct s-1 (PSPC count-rate) Products: Light curve

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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