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Home > Einstein Probe follow up > GRB 250416C (EP250416a)

EP_FIELD00034

EP

34

/EP

GRB 250416C (EP250416a): Swift observation summary

This is a confirmed GRB (GRB 250416C), the afterglow is source 1 -- please see the GRB results at https://www.swift.ac.uk/xrt_products/00019721 for updated analysis

About tiled field analysis.

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

1 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.

Details of afterglow candidates

1 sources were found which matches the afterglow criteria.

#	RA (J2000)	Dec (J2000)	Err901	Detection Flag2	Rank3	Exposure	Notes	Vizier
1 [details]	17h 05m 40.92s256.42050°	+25° 46′ 32.3″25.77564°	4.0′′ *	Good	2 (O)	1.1′	4.0 ks	The source is 3.9-σ above the RASS limit.
Mean XRT rate: 5.9 (±0.5) ×10-2 ct s-1 Peak XRT rate: 0.13 (±0.03) ct s-1 RASS PSPC 3-σ upper limit: 0.02 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.075 (±0.007) ct s-1 Peak XRT rate converted to PSPC: 0.17 (±0.04) ct s-1 Mean XRT flux: 2.16 (±0.19) ×10-12 erg cm-1s-1 Peak XRT flux: 4.9 (±1.1) ×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 3 sources have been found in the XRT data. 0 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err901	Detection Flag2	Rank3	Dist from Einstein Probe/WXT pos	Exposure	Notes	Vizier
1 [details]	17h 05m 40.92s256.42050°	+25° 46′ 32.3″25.77564°	4.0′′ *	Good	2 (O)	1.1′	4.0 ks	The source is 3.9-σ above the RASS limit.
Mean XRT rate: 5.9 (±0.5) ×10-2 ct s-1 Peak XRT rate: 0.13 (±0.03) ct s-1 RASS PSPC 3-σ upper limit: 0.02 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.075 (±0.007) ct s-1 Peak XRT rate converted to PSPC: 0.17 (±0.04) ct s-1 Mean XRT flux: 2.16 (±0.19) ×10-12 erg cm-1s-1 Peak XRT flux: 4.9 (±1.1) ×10-12 erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position
2 [details]	17h 06m 20.72s256.58634°	+25° 39′ 11.4″25.65316°	7.2′′	Reasonable	3 (U)	12.1′	2.9 ks
Mean XRT rate: 3.1 (+1.9, -1.4) ×10-3 ct s-1 Peak XRT rate: 3.1 (+1.9, -1.4) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 9.1×10-3 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 10 (+6, -4) ×10-3 ct s-1 Peak XRT rate converted to PSPC: 10 (+6, -4) ×10-3 ct s-1 Mean XRT flux: 4.5 (+2.8, -2.0) ×10-14 erg cm-1s-1 Peak XRT flux: 4.5 (+2.8, -2.0) ×10-14 erg cm-1s-1 Products: Light curve | Spectrum
3 [details]	17h 06m 20.88s256.58702°	+25° 54′ 46.3″25.91287°	9.9′′	Poor	3 (U)	13.2′	1.9 ks
Mean XRT rate: 3.4 (+2.3, -1.6) ×10-3 ct s-1 Peak XRT rate: 3.4 (+2.3, -1.6) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.01 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

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FITS image.

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Exposure map

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FITS exposure map.