GRB 250313A: Swift observation summary

Mission:	Fermi/LAT
GRB RA:	278.530°
GRB Dec:	+53.720°
GRB Err:	14.0 arcmin
T0:	2025-03-13 14:34:33 UT
Galactic:	82.69° +24.04°
Galactic N_H:	3.69× 10²⁰ cm^-2
Galactic E(B-V):	0.03771066

Sun distance:	83.47°
Sun angle:	5.01 [hr](West of Sun)
Moon distance:	96.97°
Visibility of this field.

Data analysed so far:

ObsID: 00021822001 with 3.2 ks exposure.
ObsID: 00021822002 with 3.1 ks exposure.

About ToO analysis.

Find an upper limit.

Sources found so far

So far 8 sources have been found in the XRT data. 0 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from LAT pos	Exposure
1 [details]	18h 34m 23.66s278.59860°	+53° 48′ 42.1″53.81169°	5.7′′	Good	6.0′	10.9 ks
Mean XRT rate: 3.3 (+0.9, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 3.21 (+1.08, -0.89) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.26 (+0.34, -0.28) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.2 (+0.4, -0.3) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
2 [details]	18h 33m 54.54s278.47726°	+53° 40′ 45.1″53.67919°	5.9′′	Reasonable	3.1′	10.9 ks
Mean XRT rate: 1.2 (+0.7, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 1.2 (+0.7, -0.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 6.5 (+3.8, -2.9) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 6.5 (+3.8, -2.9) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
3 [details]	18h 34m 58.45s278.74353°	+53° 48′ 40.2″53.81118°	6.1′′	Poor	9.3′	10.9 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.04 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?]
4 [details]	18h 34m 51.13s278.71305°	+53° 49′ 14.7″53.82076°	6.9′′	Good	8.9′	10.9 ks
Mean XRT rate: 3.8 (+0.9, -0.8) ×10^-3 ct s^-1 Peak XRT rate: 7.0 (±1.9) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.1 (±0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 3.9 (±1.1) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
5 [details]	18h 34m 06.96s278.52899°	+53° 52′ 04.2″53.86783°	8.1′′	Poor	8.9′	10.9 ks
Mean XRT rate: 1.6 (+0.7, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 1.74 (+1.07, -0.79) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.2 (+0.5, -0.4) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.2 (+0.8, -0.6) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
6 [details]	18h 34m 11.90s278.54958°	+53° 43′ 12.8″53.72024°	5.7′′	Poor	0.7′	10.9 ks
Mean XRT rate: 1.3 (+0.7, -0.6) ×10^-3 ct s^-1 Peak XRT rate: 1.3 (+0.7, -0.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 8 (+4, -3) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 8 (+4, -3) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
7 [details]	18h 34m 39.55s278.66478°	+53° 39′ 40.2″53.66117°	7.4′′	Poor	5.9′	10.9 ks
Mean XRT rate: 1.4 (+0.9, -0.6) ×10^-3 ct s^-1 Peak XRT rate: 1.4 (+0.9, -0.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 6.1 (+3.8, -2.8) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 6.1 (+3.8, -2.8) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
8 [details]	18h 34m 00.98s278.50407°	+53° 50′ 08.6″53.83573°	6.5′′	Reasonable	7.0′	10.9 ks
Mean XRT rate: 1.5 (+0.8, -0.6) ×10^-3 ct s^-1 Peak XRT rate: 1.5 (+0.8, -0.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 2565.10 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 4.2 (+2.3, -1.8) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 4.2 (+2.3, -1.8) ×10^-11 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.

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Exposure map

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FITS exposure map.