GRB 240527B: Swift observation summary

Mission:	Fermi/LAT
GRB RA:	128.100°
GRB Dec:	-14.480°
GRB Err:	11.4 arcmin
T0:	2024-05-27 14:03:51 UT
Galactic:	238.06° +14.68°
Galactic N_H:	4.70× 10²⁰ cm^-2
Galactic E(B-V):	0.051523

Sun distance:	71.90°
Sun angle:	4.23 [hr] (East of Sun)
Moon distance:	138.65°
Visibility of this field.

Data analysed so far:

ObsID: 00021694001 with 4.9 ks exposure.
ObsID: 00021694003 with 0.4 ks exposure.

Source 7 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.

Probable afterglow details

A source was found which matches the afterglow criteria.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from LAT pos	Exposure	Notes	Vizier
7 [details]	08h 32m 36.93s128.15387°	-14° 26′ 14.6″-14.43738°	2.0′′	Good	4.0′	5.2 ks	The source is fading with 4.1-σ significance. The source is 4.3-σ above the RASS limit.
Mean XRT rate: 0.546 (±0.018) ct s^-1 Peak XRT rate: 0.92 (±0.21) ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.10 (±0.07) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 3.5 (±0.8) ×10^-11 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=14.68°

¹ Radius, 90% confidence.
² Indicates how likely the source is to be real. See the 2SXPS 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.

Find an upper limit.

Sources found so far

So far 9 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]	08h 31m 58.26s127.99274°	-14° 38′ 43.0″-14.64526°	6.8′′	Good	11.7′	4.6 ks	Matches known X-ray source: 1RXS J083159.1-143828 (from ROSAT/RASSFSC), 19.3″ away.
Mean XRT rate: 6.9 (+1.9, -1.6) ×10^-3 ct s^-1 Peak XRT rate: 6.5 (+1.9, -1.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.9 (+0.5, -0.4) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.8 (+0.5, -0.4) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=14.68°
2 [details]	08h 32m 32.14s128.13392°	-14° 34′ 05.3″-14.56813°	3.5′′	Good	5.6′	5.2 ks
Mean XRT rate: 3.9 (±0.3) ×10^-2 ct s^-1 Peak XRT rate: 8.3 (±2.2) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.44 (±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?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=14.68°
3 [details]	08h 32m 56.41s128.23504°	-14° 20′ 33.4″-14.34262°	5.8′′	Poor	11.4′	4.9 ks
Mean XRT rate: 1.4 (+1.0, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 1.4 (+1.0, -0.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Products: Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=14.68°
4 [details]	08h 33m 07.53s128.28136°	-14° 31′ 14.0″-14.52056°	6.0′′	Good	10.8′	4.9 ks
Mean XRT rate: 5.1 (+1.6, -1.3) ×10^-3 ct s^-1 Peak XRT rate: 5.1 (+1.6, -1.3) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.10 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.4 (+0.7, -0.6) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.4 (+0.7, -0.6) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=14.68°
5 [details]	08h 32m 52.68s128.21949°	-14° 20′ 57.9″-14.34941°	7.0′′	Good	10.5′	5.2 ks
Mean XRT rate: 4.0 (+1.4, -1.2) ×10^-3 ct s^-1 Peak XRT rate: 4.0 (+1.4, -1.2) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.07 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.6 (+0.6, -0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.6 (+0.6, -0.5) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=14.68°
6 [details]	08h 32m 37.11s128.15462°	-14° 34′ 22.2″-14.57284°	6.1′′	Good	6.4′	5.2 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: 0.05 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.7 (+0.6, -0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.7 (+0.6, -0.5) ×10^-13 erg cm^-1s^-1 Products: Spectrum \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=14.68°
7 [details]	08h 32m 36.93s128.15387°	-14° 26′ 14.6″-14.43738°	2.0′′	Good	4.0′	5.2 ks	The source is fading with 4.1-σ significance. The source is 4.3-σ above the RASS limit.
Mean XRT rate: 0.546 (±0.018) ct s^-1 Peak XRT rate: 0.92 (±0.21) ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.10 (±0.07) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 3.5 (±0.8) ×10^-11 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=14.68°
8 [details]	08h 32m 50.20s128.20915°	-14° 30′ 30.6″-14.50849°	5.9′′	Poor	6.6′	5.2 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 2.79 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?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=14.68°
9 [details]	08h 32m 09.79s128.04080°	-14° 27′ 37.5″-14.46041°	6.0′′	Good	3.6′	5.2 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 26.50 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?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=14.68°

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.