GRB 160521B: Swift observation summary

Mission:	Fermi/LAT
GRB RA:	148.170°
GRB Dec:	+79.010°
GRB Err:	10.2 arcmin
T0:	2016-05-21 09:13:41 UT
Galactic:	132.31° +34.63°
Galactic N_H:	1.74× 10²⁰ cm^-2
Galactic E(B-V):	0.01893103

Sun distance:	70.00°
Sun angle:	5.97 [hr] (East of Sun)
Moon distance:	103.53°
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]	09h 50m 39.96s147.66650°	+79° 01′ 49.7″79.03048°	4.2′′	Good	5.9′	4.3 ks	The source is fading.
Mean XRT rate: 8.1 (±1.4) ×10^-3 ct s^-1 Peak XRT rate: 8.8 (±1.6) ×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: 4.8 (±0.8) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 5.2 (±0.9) ×10^-3 ct s^-1 Mean XRT flux: 2.6 (±0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.9 (±0.5) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~1.82×10^-3 [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 3 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	Notes
1 [details]	09h 50m 39.96s147.66650°	+79° 01′ 49.7″79.03048°	4.2′′	Good	5.9′	4.3 ks	The source is fading.
Mean XRT rate: 8.1 (±1.4) ×10^-3 ct s^-1 Peak XRT rate: 8.8 (±1.6) ×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: 4.8 (±0.8) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 5.2 (±0.9) ×10^-3 ct s^-1 Mean XRT flux: 2.6 (±0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.9 (±0.5) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~1.82×10^-3 [What is this?]
2 [details]	09h 50m 24.47s147.60196°	+79° 05′ 12.6″79.08683°	8.5′′	Good	7.9′	4.0 ks
Mean XRT rate: 3.1 (±1.0) ×10^-3 ct s^-1 Peak XRT rate: 3.1 (±1.2) ×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: 2.7 (±0.8) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 2.7 (±1.0) ×10^-3 ct s^-1 Mean XRT flux: 2.4 (±0.8) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.4 (±0.9) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~7.69×10^-3 [What is this?]
3 [details]	09h 50m 12.83s147.55345°	+79° 07′ 55.4″79.13205°	5.9′′	Good	10.1′	3.6 ks
Mean XRT rate: 1.9 (±0.9) ×10^-3 ct s^-1 Peak XRT rate: 2.0 (±1.1) ×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: ~1.48×10^-2 [What is this?]

Image

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FITS image.

Exposure map

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FITS exposure map.