GRB 250316A: Swift observation summary

Mission:	Swift/BAT
GRB RA:	219.630°
GRB Dec:	+14.886°
GRB Err:	3.0 arcmin
T0:	2025-03-16 08:59:57 UT
Galactic:	12.19° +62.26°
Galactic N_H:	1.43× 10²⁰ cm^-2
Galactic E(B-V):	0.02056936

Sun distance:	135.01°
Sun angle:	9.09 [hr](West of Sun)
Moon distance:	33.25°
Visibility of this field.

Data analysed so far:

ObsID: 00021823001 with 3.4 ks exposure.
ObsID: 00021823002 with 0.9 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.

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Sources found so far

So far 5 sources have been found in the XRT data. 1 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from Swift/BAT pos	Exposure	Notes
1 [details]	14h 38m 23.15s219.59644°	+14° 53′ 28.2″14.89118°	3.1′′	Good	2.0′	4.3 ks
Mean XRT rate: 1.80 (+0.25, -0.24) ×10^-2 ct s^-1 Peak XRT rate: 2.1 (±0.4) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 5.3 (±0.7) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 6.0 (±1.2) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
2 [details]	14h 38m 06.54s219.52725°	+14° 49′ 10.1″14.81946°	3.8′′	Good	7.2′	4.3 ks	Matches SIMBAD source: SDSS J143806.60+144910.2, 0.7″ away.
Mean XRT rate: 9.6 (±2.4) ×10^-3 ct s^-1 Peak XRT rate: 9.6 (±2.4) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.5 (±0.6) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.5 (±0.6) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
3 [details]	14h 38m 30.75s219.62811°	+15° 02′ 23.4″15.03984°	5.6′′	Good	9.2′	4.3 ks
Mean XRT rate: 1.92 (+1.13, -0.86) ×10^-3 ct s^-1 Peak XRT rate: 1.92 (+1.13, -0.86) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.10 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.73 (+1.02, -0.77) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.73 (+1.02, -0.77) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
4 [details]	14h 38m 17.50s219.57293°	+14° 58′ 01.3″14.96703°	6.9′′	Reasonable	5.9′	4.3 ks
Mean XRT rate: 1.88 (+1.03, -0.78) ×10^-3 ct s^-1 Peak XRT rate: 1.88 (+1.03, -0.78) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
5 [details]	14h 38m 10.52s219.54381°	+14° 48′ 25.1″14.80697°	6.9′′	Poor	6.9′	4.3 ks
Mean XRT rate: 1.6 (+1.0, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 1.6 (+1.0, -0.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 1451.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 5.6 (+3.5, -2.6) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 5.6 (+3.5, -2.6) ×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.

Image

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FITS image.

Exposure map

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FITS exposure map.