GRB 250515A: Swift observation summary

Mission:	Fermi/GBM
GRB RA:	159.636°
GRB Dec:	+19.417°
GRB Err:	3 arcsec
T0:	2025-05-15 20:46:21 UT
Galactic:	219.98° +58.62°
Galactic N_H:	1.94× 10²⁰ cm^-2
Galactic E(B-V):	0.02548935

Sun distance:	98.84°
Sun angle:	7.14 [hr] (East of Sun)
Moon distance:	116.62°
Visibility of this field.

Data analysed so far:

ObsID: 00021829001 with 4.5 ks exposure.

About ToO analysis.

Find an upper limit.

Sources found so far

So far 5 sources have been found in the XRT data. 2 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from Fermi/GBM pos	Exposure	Notes
1 [details]	10h 38m 41.23s159.67178°	+19° 32′ 04.9″19.53469°	9.2′′	Poor	7.3′	4.5 ks
Mean XRT rate: 1.5 (+0.9, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 1.5 (+0.9, -0.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Products: Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
2 [details]	10h 38m 05.93s159.52471°	+19° 32′ 07.6″19.53545°	7.5′′	Good	9.5′	4.5 ks	Matches SIMBAD source: SDSS J103805.61+193216.3, 9.8″ away.
Mean XRT rate: 4.7 (+1.5, -1.3) ×10^-3 ct s^-1 Peak XRT rate: 4.7 (+1.5, -1.3) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.3 (±0.4) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.3 (±0.4) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
3 [details]	10h 37m 56.39s159.48495°	+19° 29′ 40.4″19.49455°	6.1′′	Reasonable	9.7′	4.5 ks
Mean XRT rate: 3.2 (+1.3, -1.0) ×10^-3 ct s^-1 Peak XRT rate: 3.2 (+1.3, -1.0) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 6.6 (+2.6, -2.1) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 6.6 (+2.6, -2.1) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
4 [details]	10h 39m 10.63s159.79429°	+19° 31′ 44.0″19.52888°	6.3′′	Reasonable	11.2′	4.5 ks	Matches SIMBAD source: TYC 1424-940-1, 12.1″ away.
Mean XRT rate: 1.80 (+1.11, -0.79) ×10^-3 ct s^-1 Peak XRT rate: 1.80 (+1.11, -0.79) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
5 [details]	10h 38m 35.73s159.64888°	+19° 27′ 34.6″19.45961°	6.3′′	Good	2.7′	4.5 ks
Mean XRT rate: 2.92 (+1.18, -0.96) ×10^-3 ct s^-1 Peak XRT rate: 2.92 (+1.18, -0.96) ×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 (+2.5, -2.1) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 6.3 (+2.5, -2.1) ×10^-14 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

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FITS image.

Exposure map

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FITS exposure map.