GRB 150523B: Swift observation summary

Mission:	Fermi/LAT
GRB RA:	115.360°
GRB Dec:	-45.400°
GRB Err:	6.0 arcmin
T0:	2015-05-23 09:29:45 UT
Galactic:	258.65° -10.92°
Galactic N_H:	2.26× 10²¹ cm^-2
Galactic E(B-V):	0.284311

Sun distance:	82.96°
Sun angle:	3.70 [hr] (East of Sun)
Moon distance:	60.71°
Visibility of this field.

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 field 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
1 [details]	07h 41m 08.68s115.28618°	-45° 25′ 14.8″-45.42078°	3.6′′	Good	3.4′	6.6 ks	The source is fading. The source is brighter than the RASS limit.
Mean XRT rate: 9.8 (±0.5) ×10^-2 ct s^-1 Peak XRT rate: 0.16 (±0.04) ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.095 (±0.005) ct s^-1 Peak XRT rate converted to PSPC: 0.15 (±0.03) ct s^-1 Mean XRT flux: 4.06 (±0.20) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 6.5 (±1.5) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~1.46×10^-5 [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.

Find an upper limit.

Sources found so far

So far 14 sources have been found in the XRT data. 3 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from LAT pos	Exposure	Notes
1 [details]	07h 41m 08.68s115.28618°	-45° 25′ 14.8″-45.42078°	3.6′′	Good	3.4′	6.6 ks	The source is fading. The source is brighter than the RASS limit.
Mean XRT rate: 9.8 (±0.5) ×10^-2 ct s^-1 Peak XRT rate: 0.16 (±0.04) ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.095 (±0.005) ct s^-1 Peak XRT rate converted to PSPC: 0.15 (±0.03) ct s^-1 Mean XRT flux: 4.06 (±0.20) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 6.5 (±1.5) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~1.46×10^-5 [What is this?]
2 [details]	07h 41m 39.83s115.41595°	-45° 19′ 11.7″-45.31991°	4.8′′	Good	5.4′	7.1 ks	A SIMBAD object matches this source's position: (Show) HD 62399, 1.7′′ away
Mean XRT rate: 4.0 (±1.0) ×10^-3 ct s^-1 Peak XRT rate: 5.4 (±1.9) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.06 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 6.2 (±1.5) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 8 (±3) ×10^-3 ct s^-1 Mean XRT flux: 8.8 (±2.2) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 1.2 (±0.4) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~2.02×10^-3 [What is this?]
3 [details]	07h 40m 09.86s115.04108°	-45° 20′ 59.1″-45.34974°	4.9′′	Good	13.8′	3.1 ks	This source may be affected by optical loading A SIMBAD object matches this source's position: (Show) HD 62088, 1.7′′ away
Mean XRT rate: 2.3 (±1.3) ×10^-3 ct s^-1 Peak XRT rate: 2.3 (±1.3) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (PSPC count-rate) Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.02 [What is this?]
4 [details]	07h 41m 36.32s115.40133°	-45° 28′ 14.5″-45.47068°	4.7′′	Good	4.6′	7.1 ks
Mean XRT rate: 2.6 (±0.8) ×10^-3 ct s^-1 Peak XRT rate: 4.6 (±2.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 2.1 (±0.7) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 3.7 (±2.1) ×10^-3 ct s^-1 Mean XRT flux: 1.3 (±0.4) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.2 (±1.2) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~3.52×10^-3 [What is this?]
5 [details]	07h 41m 36.16s115.40065°	-45° 25′ 27.9″-45.42442°	6.4′′	Reasonable	2.3′	7.3 ks
Mean XRT rate: 0.00 (±0.00) ×10^-1 ct s^-1 Peak XRT rate: 0.00 (±0.00) ×10^-1 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (PSPC count-rate) Products: Spectrum \| Expected serendipitous sources: ~1.05×10^-2 [What is this?]
6 [details]	07h 42m 17.76s115.57398°	-45° 18′ 02.8″-45.30079°	5.1′′	Good	10.8′	5.8 ks
Mean XRT rate: 3.5 (±1.0) ×10^-3 ct s^-1 Peak XRT rate: 6 (±3) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 7.5 (±2.1) ×10^-5 ct s^-1 Peak XRT rate converted to PSPC: 1.3 (±0.7) ×10^-4 ct s^-1 Mean XRT flux: 1.3 (±0.4) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.2 (±1.2) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~8.11×10^-3 [What is this?]
7 [details]	07h 41m 26.56s115.36066°	-45° 34′ 27.7″-45.57437°	6.6′′	Good	10.5′	4.3 ks	A SIMBAD object matches this source's position: (Show) TYC 8134-1459-1, 10.1′′ away
Mean XRT rate: 0.00 (±0.00) ×10^-1 ct s^-1 Peak XRT rate: 0.00 (±0.00) ×10^-1 ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (PSPC count-rate) Products: Light curve \| Spectrum \| Expected serendipitous sources: ~1.33×10^-2 [What is this?]
8 [details]	07h 40m 50.34s115.20974°	-45° 14′ 38.7″-45.24408°	10.6′′	Poor	11.3′	5.3 ks
Mean XRT rate: 3.4 (±1.0) ×10^-3 ct s^-1 Peak XRT rate: 3.4 (±1.0) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 5.5 (±1.6) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 5.5 (±1.6) ×10^-3 ct s^-1 Mean XRT flux: 5.9 (±1.7) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 5.9 (±1.7) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~9.30×10^-3 [What is this?]
9 [details]	07h 40m 30.86s115.12857°	-45° 26′ 02.9″-45.43413°	6.6′′	Good	10.0′	5.8 ks
Mean XRT rate: 2.2 (±0.8) ×10^-3 ct s^-1 Peak XRT rate: 2.2 (±0.8) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 4.3 (±1.6) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 4.3 (±1.6) ×10^-3 ct s^-1 Mean XRT flux: 3.1 (±1.1) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 3.1 (±1.1) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~1.33×10^-2 [What is this?]
10 [details]	07h 41m 29.03s115.37096°	-45° 18′ 25.2″-45.30700°	5.1′′	Good	5.6′	7.0 ks
Mean XRT rate: 1.1 (±0.5) ×10^-3 ct s^-1 Peak XRT rate: 1.1 (±0.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.06 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 2.1 (±1.0) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 2.1 (±1.0) ×10^-3 ct s^-1 Mean XRT flux: 1.4 (±0.7) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 1.4 (±0.7) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~1.13×10^-2 [What is this?]
11 [details]	07h 41m 53.67s115.47361°	-45° 18′ 54.7″-45.31520°	5.7′′	Good	7.0′	7.1 ks
Mean XRT rate: 0.00 (±0.00) ×10^-1 ct s^-1 Peak XRT rate: 0.00 (±0.00) ×10^-1 ct s^-1 RASS PSPC 3-σ upper limit: 0.07 ct s^-1 (PSPC count-rate) Products: Spectrum \| Expected serendipitous sources: ~1.50×10^-2 [What is this?]
12 [details]	07h 41m 28.21s115.36755°	-45° 24′ 43.0″-45.41194°	5.2′′	Good	0.8′	7.2 ks
Mean XRT rate: 1.3 (±0.6) ×10^-3 ct s^-1 Peak XRT rate: 1.3 (±0.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 7 (±4) ×10^-6 ct s^-1 Peak XRT rate converted to PSPC: 7 (±4) ×10^-6 ct s^-1 Mean XRT flux: 10 (±5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 10 (±5) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~9.42×10^-3 [What is this?]
13 [details]	07h 40m 55.62s115.23174°	-45° 22′ 30.0″-45.37499°	6.3′′	Poor	5.6′	7.3 ks
Mean XRT rate: 0.00 (±0.00) ×10^-1 ct s^-1 Peak XRT rate: 0.00 (±0.00) ×10^-1 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 1.8 (+1.0, -0.8) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 1.8 (+1.0, -0.8) ×10^-3 ct s^-1 Mean XRT flux: 1.4 (+0.8, -0.6) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 1.4 (+0.8, -0.6) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~1.17×10^-2 [What is this?]
14 [details]	07h 41m 46.62s115.44424°	-45° 28′ 53.8″-45.48162°	6.9′′	Poor	6.0′	7.0 ks
Mean XRT rate: 0.00 (±0.00) ×10^-1 ct s^-1 Peak XRT rate: 0.00 (±0.00) ×10^-1 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (PSPC count-rate) Products: Spectrum \| Expected serendipitous sources: ~1.00×10^-2 [What is this?]

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FITS image.

Exposure map

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FITS exposure map.