GRB 250407A: Swift observation summary

Mission:	Fermi/GBM
GRB RA:	110.756°
GRB Dec:	+36.798°
GRB Err:	18 arcsec
T0:	2025-04-07 15:48:21 UT
Galactic:	181.60° +21.78°
Galactic N_H:	5.80× 10²⁰ cm^-2
Galactic E(B-V):	0.05894917

Sun distance:	89.34°
Sun angle:	6.30 [hr] (East of Sun)
Moon distance:	32.86°
Visibility of this field.

Data analysed so far:

ObsID: 00021826001 with 0.3 ks exposure.

Source 1 has been manually confirmed as the GRB afterglow; data for this object are now available through the main GRB results area for this GRB.

About ToO analysis.

Probable afterglow details

A source was found which matches the afterglow criteria.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from Fermi/GBM pos	Exposure	Notes	Vizier
1 [details]	07h 23m 02.10s110.75876°	+36° 47′ 53.8″36.79827°	2.8′′	Good	8.0′′	293 s	The source is 4.4-σ above the RASS limit.
Mean XRT rate: 1.58 (±0.12) ct s^-1 Peak XRT rate: 2.0 (±0.5) ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 6.9 (±0.5) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 8.7 (±2.0) ×10^-11 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]

¹ Radius, 90% confidence.
² Indicates how likely the source is to be real. See the 2SXPS 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.

Find an upper limit.

Sources found so far

So far 2 sources have been found in the XRT data. 1 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from Fermi/GBM pos	Exposure	Notes
1 [details]	07h 23m 02.10s110.75876°	+36° 47′ 53.8″36.79827°	2.8′′	Good	8.0′′	293 s	The source is 4.4-σ above the RASS limit.
Mean XRT rate: 1.58 (±0.12) ct s^-1 Peak XRT rate: 2.0 (±0.5) ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 6.9 (±0.5) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 8.7 (±2.0) ×10^-11 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
2 [details]	07h 22m 01.19s110.50495°	+36° 45′ 38.3″36.76063°	7.8′′	Good	12.3′	293 s	This source may be affected by optical loading Matches SIMBAD source: * 65 Aur B, 13.8″ away.
Mean XRT rate: 3.7 (+1.8, -1.3) ×10^-2 ct s^-1 Peak XRT rate: 3.7 (+1.8, -1.3) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 7.5 (+3.6, -2.7) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 7.5 (+3.6, -2.7) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]

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.