GRB 250506A: Swift observation summary

Mission:	SVOM/ECLAIRs
GRB RA:	219.267°
GRB Dec:	+28.859°
GRB Err:	47.8 arcsec
T0:	2025-05-06 02:23:22 UT
Galactic:	43.39° +66.67°
Galactic N_H:	1.55× 10²⁰ cm^-2
Galactic E(B-V):	0.01630345

Sun distance:	134.52°
Sun angle:	11.75 [hr] (East of Sun)
Moon distance:	61.02°
Visibility of this field.

Data analysed so far:

ObsID: 00021828001 with 2.9 ks exposure.
ObsID: 00021828002 with 3.3 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.

Find an upper limit.

Sources found so far

So far 13 sources have been found in the XRT data. 1 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from SVOM/MXT pos	Exposure	Notes
1 [details]	14h 37m 07.86s219.28274°	+28° 52′ 42.3″28.87843°	2.3′′	Good	1.4′	6.3 ks
Mean XRT rate: 3.75 (±0.29) ×10^-2 ct s^-1 Peak XRT rate: 7.9 (±2.1) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.48 (±0.12) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 3.1 (±0.8) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
2 [details]	14h 37m 01.72s219.25715°	+28° 44′ 09.7″28.73603°	8.5′′	Good	7.4′	6.3 ks
Mean XRT rate: 2.26 (+1.04, -0.86) ×10^-3 ct s^-1 Peak XRT rate: 2.26 (+1.04, -0.86) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 6.3 (+2.9, -2.4) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 6.3 (+2.9, -2.4) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
3 [details]	14h 37m 44.26s219.43440°	+28° 55′ 32.6″28.92572°	7.3′′	Good	9.7′	6.3 ks	This source may be affected by extended emission Matches SIMBAD source: 7C 143533.9+290829, 1.3″ away.
Mean XRT rate: 2.91 (+1.04, -0.86) ×10^-3 ct s^-1 Peak XRT rate: 2.91 (+1.04, -0.86) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.1 (+0.4, -0.3) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.1 (+0.4, -0.3) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
4 [details]	14h 37m 25.89s219.35790°	+28° 43′ 27.6″28.72433°	8.3′′	Good	9.4′	6.3 ks
Mean XRT rate: 3.36 (+1.13, -0.95) ×10^-3 ct s^-1 Peak XRT rate: 3.36 (+1.13, -0.95) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.07 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.51 (+1.18, -0.99) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 3.51 (+1.18, -0.99) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
5 [details]	14h 36m 50.59s219.21080°	+29° 02′ 39.0″29.04416°	6.7′′	Good	11.5′	6.3 ks
Mean XRT rate: 3.4 (+1.2, -1.0) ×10^-3 ct s^-1 Peak XRT rate: 3.4 (+1.2, -1.0) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 17090.94 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.2 (+0.8, -0.6) ×10^-10 erg cm^-1s^-1 Peak XRT flux: 2.2 (+0.8, -0.6) ×10^-10 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
6 [details]	14h 37m 47.09s219.44622°	+28° 55′ 59.0″28.93306°	8.2′′	Reasonable	10.4′	6.3 ks	This source may be affected by extended emission
Mean XRT rate: 3.12 (+1.11, -0.92) ×10^-3 ct s^-1 Peak XRT rate: 3.12 (+1.11, -0.92) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.08 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.5 (+0.9, -0.7) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.5 (+0.9, -0.7) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
7 [details]	14h 36m 52.18s219.21741°	+28° 43′ 12.0″28.72001°	7.1′′	Poor	8.7′	6.3 ks
Mean XRT rate: 2.41 (+1.05, -0.86) ×10^-3 ct s^-1 Peak XRT rate: 2.41 (+1.05, -0.86) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.7 (+1.6, -1.3) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 3.7 (+1.6, -1.3) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
8 [details]	14h 36m 20.35s219.08478°	+28° 48′ 37.0″28.81027°	7.6′′	Poor	10.0′	6.3 ks	This source may be affected by extended emission
Mean XRT rate: 3.2 (±1.0) ×10^-3 ct s^-1 Peak XRT rate: 3.2 (±1.0) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
9 [details]	14h 36m 19.82s219.08257°	+28° 49′ 15.7″28.82102°	5.4′′	Poor	10.0′	6.3 ks	This source may be affected by extended emission
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 (XRT equiv count-rate) Products: Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
10 [details]	14h 36m 34.25s219.14269°	+28° 57′ 43.9″28.96220°	6.0′′	Poor	9.0′	6.3 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 95290416513.09 ct s^-1 (XRT equiv count-rate) Mean XRT flux: undetermined erg cm^-1s^-1 Peak XRT flux: undetermined erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
11 [details]	14h 37m 32.66s219.38608°	+28° 52′ 16.6″28.87127°	5.6′′	Poor	6.3′	6.3 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate) Mean XRT flux: undetermined erg cm^-1s^-1 Peak XRT flux: undetermined erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
12 [details]	14h 36m 44.29s219.18456°	+28° 59′ 26.2″28.99062°	5.0′′	Reasonable	9.0′	6.3 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 1.1×10^-3 ct s^-1 (XRT equiv count-rate) Mean XRT flux: undetermined erg cm^-1s^-1 Peak XRT flux: undetermined erg cm^-1s^-1 Products: Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
13 [details]	14h 36m 41.66s219.17359°	+28° 52′ 24.0″28.87333°	5.9′′	Poor	5.0′	6.3 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 (XRT equiv count-rate) Mean XRT flux: undetermined erg cm^-1s^-1 Peak XRT flux: undetermined erg cm^-1s^-1 Products: Spectrum \| 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

Select image style: Draggable PNG | JS9.

Magnify image and make scrollable?

FITS image.

Exposure map

Magnify exposure map and make scrollable?

FITS exposure map.