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Home > Einstein Probe follow up > EP J1616.7-3042

EP_FIELD00030

EP

30

/EP

EP J1616.7-3042: Swift observation summary

Data analysed so far:

• ObsID: 00019637001 with 2.9 ks exposure.
• ObsID: 00019637002 with 2.0 ks exposure.

About tiled field analysis.

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

• 19637 — 4.8 ks of cleaned data taken between 2025-03-22 19:45:13 and 2025-03-24 10:55:03

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 pos	Exposure	Notes	Vizier
1 [details]	16h 16m 39.14s244.16310°	-30° 42′ 24.1″-30.70671°	4.0′′	Good	2 (O)	32.7′	8.0 ks	The source is fading with 3.1-σ significance.
Mean XRT rate: 1.47 (±0.18) ×10-2 ct s-1 Peak XRT rate: 3.5 (±0.9) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.06 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.0175 (±0.0021) ct s-1 Peak XRT rate converted to PSPC: 0.042 (±0.011) ×10-2 ct s-1 Mean XRT flux: 5.5 (±0.7) ×10-13 erg cm-1s-1 Peak XRT flux: 1.3 (±0.4) ×10-12 erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position

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

#	RA (J2000)	Dec (J2000)	Err901	Detection Flag2	Rank3	Dist from Einstein Probe pos	Exposure	Notes	Vizier
1 [details]	16h 16m 39.14s244.16310°	-30° 42′ 24.1″-30.70671°	4.0′′	Good	2 (O)	32.7′	8.0 ks	The source is fading with 3.1-σ significance.
Mean XRT rate: 1.47 (±0.18) ×10-2 ct s-1 Peak XRT rate: 3.5 (±0.9) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.06 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.0175 (±0.0021) ct s-1 Peak XRT rate converted to PSPC: 0.042 (±0.011) ×10-2 ct s-1 Mean XRT flux: 5.5 (±0.7) ×10-13 erg cm-1s-1 Peak XRT flux: 1.3 (±0.4) ×10-12 erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position
2 [details]	16h 16m 03.57s244.01490°	-30° 37′ 15.7″-30.62102°	5.2′′	Good	3 (U)	36.6′	8.0 ks	This source may be affected by optical loading Matches SIMBAD source: HD 146177, 3.3″ away.
Mean XRT rate: 3.00 (+1.05, -0.85) ×10-3 ct s-1 Peak XRT rate: 3.9 (+2.0, -1.6) ×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: 6.1 (+2.1, -1.7) ×10-3 ct s-1 Peak XRT rate converted to PSPC: 8 (+4, -3) ×10-3 ct s-1 Mean XRT flux: 4.6 (+1.6, -1.3) ×10-14 erg cm-1s-1 Peak XRT flux: 6.0 (+3.0, -2.4) ×10-14 erg cm-1s-1 Products: Light curve | Spectrum
3 [details]	16h 16m 00.10s244.00044°	-30° 43′ 46.4″-30.72957°	7.2′′	Poor	3 (U)	40.3′	8.0 ks
Mean XRT rate: 3.4 (+1.8, -1.4) ×10-3 ct s-1 Peak XRT rate: 3.4 (+1.8, -1.4) ×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: 5.7 (+3.0, -2.3) ×10-3 ct s-1 Peak XRT rate converted to PSPC: 5.7 (+3.0, -2.3) ×10-3 ct s-1 Mean XRT flux: 5.5 (+2.9, -2.2) ×10-14 erg cm-1s-1 Peak XRT flux: 5.5 (+2.9, -2.2) ×10-14 erg cm-1s-1 Products: Light curve | Spectrum
4 [details]	16h 16m 06.62s244.02758°	-30° 46′ 41.3″-30.77813°	8.2′′	Poor	3 (U)	40.8′	8.0 ks	Matches SIMBAD source: NVSS J161606-304645, 5.7″ away.
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.10 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: undetermined ct s-1 Peak XRT rate converted to PSPC: undetermined ct s-1 Mean XRT flux: undetermined erg cm-1s-1 Peak XRT flux: undetermined erg cm-1s-1 Products: Light curve | Spectrum
5 [details]	16h 16m 48.35s244.20145°	-30° 36′ 42.3″-30.61175°	7.0′′	Poor	3 (U)	27.8′	8.0 ks
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.02 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: undetermined ct s-1 Peak XRT rate converted to PSPC: undetermined ct s-1 Mean XRT flux: undetermined erg cm-1s-1 Peak XRT flux: undetermined erg cm-1s-1 Products: Light curve | Spectrum
6 [details]	16h 17m 20.36s244.33482°	-30° 34′ 01.1″-30.56696°	10.1′′	Poor	3 (U)	20.6′	6.3 ks
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.04 ct s-1 (PSPC count-rate) Products: Light curve | Enhanced position
7 [details]	16h 16m 21.71s244.09046°	-30° 32′ 34.9″-30.54302°	7.4′′	Poor	3 (U)	31.2′	8.0 ks
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.03 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: undetermined ct s-1 Peak XRT rate converted to PSPC: undetermined ct s-1 Products: Light curve | Spectrum
8 [details]	16h 17m 28.62s244.36927°	-30° 34′ 39.0″-30.57749°	7.3′′	Poor	3 (U)	19.5′	3.8 ks
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: 0.03 ct s-1 (PSPC count-rate) Products: Light curve
9 [details]	16h 16m 33.02s244.13759°	-30° 32′ 55.7″-30.54881°	7.0′′	Poor	3 (U)	29.1′	8.0 ks
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.0×100 ct s-1 (PSPC count-rate) Mean XRT flux: undetermined erg cm-1s-1 Peak XRT flux: undetermined erg cm-1s-1 Products: Light curve | Spectrum
10 [details]	16h 17m 08.26s244.28441°	-30° 37′ 22.7″-30.62298°	8.6′′	Poor	3 (U)	24.6′	8.0 ks
Mean XRT rate: 3.01 (+1.20, -1.00) ×10-3 ct s-1 Peak XRT rate: 3.01 (+1.20, -1.00) ×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: 3.6 (+1.5, -1.2) ×10-3 ct s-1 Peak XRT rate converted to PSPC: 3.6 (+1.5, -1.2) ×10-3 ct s-1 Mean XRT flux: 10 (+4, -3) ×10-14 erg cm-1s-1 Peak XRT flux: 10 (+4, -3) ×10-14 erg cm-1s-1 Products: Light curve | Spectrum
11 [details]	16h 16m 57.81s244.24088°	-30° 50′ 36.6″-30.84351°	6.9′′	Poor	3 (U)	35.7′	8.0 ks	Matches SIMBAD source: 2MASS J16165647-3050238, 21.5″ away.
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.03 ct s-1 (PSPC count-rate) Products: Light curve
12 [details]	16h 17m 02.44s244.26016°	-30° 38′ 24.2″-30.64007°	6.5′′	Poor	3 (U)	26.3′	8.0 ks
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 1.90 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: undetermined ct s-1 Peak XRT rate converted to PSPC: undetermined ct s-1 Mean XRT flux: undetermined erg cm-1s-1 Peak XRT flux: undetermined 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.

Image

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FITS image.

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Exposure map

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FITS exposure map.