GRB 250402A: Swift observation summary

This is a confirmed GRB (GRB 250402A), the afterglow is source 1 -- please see the GRB results at https://www.swift.ac.uk/xrt_products/00019673 for updated analysis

Mission:	SVOM/ECLAIRs
SVOM RA:	213.355°
SVOM Dec:	-5.937°
SVOM Err:	4.1 arcmin
T0:	2025-04-02 23:08:01 UT
Galactic:	336.90° +51.44°
Galactic N_H:	2.52× 10²⁰ cm^-2

Sun distance:	158.78°
Sun angle:	10.58 [hr] (West of Sun)
Moon distance:	135.77°
Visibility of this field.
First slew:	2025-04-03 12:44:42 UT
First observation:	2025-04-03 12:44:10 UT
First analysis:	2025-04-03 15:31:46 UT

Data analysed so far:

ObsID: 00019673001 with 2.4 ks exposure.

About tiled field analysis.

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

19673 — 2.4 ks of cleaned data taken between 2025-04-03 12:44:40 and 2025-04-03 13:27:04

Find an upper limit.

Sources found so far

So far 3 sources have been found in the XRT data. 1 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Rank³	Dist from SVOM/ECLAIRs pos	Exposure	Notes
1 [details]	14h 13m 38.13s213.40886°	-05° 55′ 48.5″-5.93015°	3.4′′ ^*	Good	3 (U)	3.2′	2.4 ks
Mean XRT rate: 3.1 (±0.4) ×10^-2 ct s^-1 Peak XRT rate: 4.5 (±1.2) ×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: 0.039 (±0.005) ct s^-1 Peak XRT rate converted to PSPC: 0.057 (±0.015) ×10^-2 ct s^-1 Mean XRT flux: 1.28 (±0.18) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 1.9 (±0.5) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
2 [details]	14h 13m 29.27s213.37194°	-06° 04′ 12.9″-6.07025°	4.4′′ ^*	Good	3 (U)	8.1′	2.4 ks
Mean XRT rate: 9.7 (±2.6) ×10^-3 ct s^-1 Peak XRT rate: 9.7 (±2.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.015 (±0.004) ×10^-2 ct s^-1 Peak XRT rate converted to PSPC: 0.015 (±0.004) ×10^-2 ct s^-1 Mean XRT flux: 2.4 (±0.6) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.4 (±0.6) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
3 [details]	14h 13m 48.71s213.45294°	-06° 00′ 01.7″-6.00047°	6.3′′	Good	3 (U)	7.0′	2.4 ks	Matches SIMBAD source: 4C -05.60, 3.4″ away.
Mean XRT rate: 3.6 (+1.9, -1.5) ×10^-3 ct s^-1 Peak XRT rate: 3.6 (+1.9, -1.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.11 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 9 (+5, -4) ×10^-4 ct s^-1 Peak XRT rate converted to PSPC: 9 (+5, -4) ×10^-4 ct s^-1 Mean XRT flux: 1.4 (+0.7, -0.6) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.4 (+0.7, -0.6) ×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.