GRB 250507A: Swift observation summary

This is a confirmed GRB (GRB 250507A), the afterglow is source 1 -- please see the GRB results at https://www.swift.ac.uk/xrt_products/00019769 for updated analysis

Mission:	SVOM/ECLAIRs
SVOM RA:	183.063°
SVOM Dec:	-23.625°
SVOM Err:	7.6 arcmin
T0:	2025-05-07 06:34:52 UT
Galactic:	291.46° +38.37°
Galactic N_H:	7.88× 10²⁰ cm^-2

Sun distance:	140.98°
Sun angle:	9.26 [hr] (East of Sun)
Moon distance:	32.48°
Visibility of this field.
First slew:	2025-05-07 08:34:51 UT
First observation:	2025-05-07 08:34:18 UT
First analysis:	2025-05-07 14:52:00 UT

Data analysed so far:

ObsID: 00019769001 with 1.8 ks exposure.

About tiled field analysis.

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

19769 — 1.8 ks of cleaned data taken between 2025-05-07 08:34:48 and 2025-05-07 10:02:33

Find an upper limit.

Sources found so far

So far 3 sources have been found in the XRT data. 2 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Rank³	Dist from SVOM/ECLAIRs pos	Exposure	Notes
1 [details]	12h 12m 15.40s183.06416°	-23° 35′ 19.6″-23.58879°	4.2′′	Good	3 (U)	2.2′	1.8 ks
Mean XRT rate: 2.6 (±0.5) ×10^-2 ct s^-1 Peak XRT rate: 2.7 (±0.6) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.044 (±0.008) ct s^-1 Peak XRT rate converted to PSPC: 0.046 (±0.010) ×10^-2 ct s^-1 Mean XRT flux: 6.0 (±1.1) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 6.3 (±1.3) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum
2 [details]	12h 11m 49.71s182.95711°	-23° 32′ 29.2″-23.54144°	4.9′′	Good	3 (U)	7.7′	1.8 ks	Matches SIMBAD source: 2MASS J12114965-2332263, 2.9″ away.
Mean XRT rate: 1.5 (±0.4) ×10^-2 ct s^-1 Peak XRT rate: 1.5 (±0.4) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.07 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.025 (±0.006) ct s^-1 Peak XRT rate converted to PSPC: 0.025 (±0.006) ×10^-2 ct s^-1 Mean XRT flux: 3.1 (±0.8) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 3.1 (±0.8) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum
3 [details]	12h 12m 04.68s183.01950°	-23° 27′ 38.8″-23.46077°	5.6′′	Good	3 (U)	10.1′	1.8 ks	Matches SIMBAD source: PMN J1212-2327, 3.9″ away.
Mean XRT rate: 1.4 (+0.4, -0.3) ×10^-2 ct s^-1 Peak XRT rate: 1.4 (+0.4, -0.3) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.019 (±0.005) ct s^-1 Peak XRT rate converted to PSPC: 0.019 (±0.005) ×10^-2 ct s^-1 Mean XRT flux: 4.7 (+1.4, -1.2) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 4.7 (+1.4, -1.2) ×10^-13 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.

Exposure map

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FITS exposure map.