GRB 240821A: Swift observation summary

Mission:	Fermi/LAT
GRB RA:	354.230°
GRB Dec:	-10.180°
GRB Err:	13.0 arcmin
T0:	2024-08-21 18:35:45 UT
Galactic:	73.38° -65.60°
Galactic N_H:	2.36× 10²⁰ cm^-2
Galactic E(B-V):	0.02926251

Sun distance:	157.12°
Sun angle:	10.45 [hr] (West of Sun)
Moon distance:	8.76°
Visibility of this field.

Data analysed so far:

ObsID: 00021704001 with 5.0 ks exposure.

Source 3 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 4 sources have been found in the XRT data. 1 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from LAT pos	Exposure	Notes
1 [details]	23h 37m 09.58s354.28992°	-10° 03′ 13.2″-10.05366°	7.1′′	Good	8.4′	5.0 ks
Mean XRT rate: 1.9 (+1.0, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 1.9 (+1.0, -0.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 6.2 (+3.2, -2.4) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 6.2 (+3.2, -2.4) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
2 [details]	23h 36m 41.12s354.17134°	-10° 02′ 58.0″-10.04946°	7.4′′	Good	8.6′	5.0 ks	Matches SIMBAD source: SDSS J233641.30-100258.0, 2.7″ away.
Mean XRT rate: 2.49 (+1.09, -0.86) ×10^-3 ct s^-1 Peak XRT rate: 2.49 (+1.09, -0.86) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.14 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 8.2 (+3.6, -2.8) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 8.2 (+3.6, -2.8) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
3 [details]	23h 37m 04.80s354.27000°	-10° 11′ 17.6″-10.18823°	10.3′′	Poor	2.4′	5.0 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: 0.02 ct s^-1 (XRT equiv count-rate) Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
4 [details]	23h 36m 41.14s354.17141°	-10° 10′ 39.4″-10.17762°	5.8′′	Reasonable	3.5′	5.0 ks
Mean XRT rate: 1.3 (+0.8, -0.6) ×10^-3 ct s^-1 Peak XRT rate: 1.3 (+0.8, -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: 3.0 (+1.8, -1.4) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 3.0 (+1.8, -1.4) ×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.