GRB 160221A: Swift observation summary

Mission:	INTEGRAL
GRB RA:	232.082°
GRB Dec:	-28.434°
GRB Err:	2.5 arcmin
T0:	2016-02-21 23:49:26 UT
Galactic:	340.06° +22.90°
Galactic N_H:	9.48× 10²⁰ cm^-2
Galactic E(B-V):	0.3050332

Sun distance:	95.90°
Sun angle:	6.84 [hr](West of Sun)
Moon distance:	92.35°
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 INTEGRAL pos	Exposure	Notes	Vizier
1 [details]	15h 28m 21.48s232.08951°	-28° 27′ 18.4″-28.45512°	4.1′′	Good	1.3′	2.5 ks	The source is fading.
Mean XRT rate: 1.42 (±0.25) ×10^-2 ct s^-1 Peak XRT rate: 1.42 (±0.25) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.0166 (±0.0029) ct s^-1 Peak XRT rate converted to PSPC: 0.0166 (±0.0029) ct s^-1 Mean XRT flux: 4.7 (±0.8) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 4.7 (±0.8) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~4.34×10^-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 3 sources have been found in the XRT data. 2 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from INTEGRAL pos	Exposure	Notes
1 [details]	15h 28m 21.48s232.08951°	-28° 27′ 18.4″-28.45512°	4.1′′	Good	1.3′	2.5 ks	The source is fading.
Mean XRT rate: 1.42 (±0.25) ×10^-2 ct s^-1 Peak XRT rate: 1.42 (±0.25) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.0166 (±0.0029) ct s^-1 Peak XRT rate converted to PSPC: 0.0166 (±0.0029) ct s^-1 Mean XRT flux: 4.7 (±0.8) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 4.7 (±0.8) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~4.34×10^-5 [What is this?]
2 [details]	15h 27m 37.31s231.90548°	-28° 21′ 37.8″-28.36050°	4.5′′	Good	10.3′	2.2 ks	A SIMBAD object matches this source's position: (Show) 2MASX J15273740-2821403, 2.8′′ away
Mean XRT rate: 1.67 (±0.24) ×10^-2 ct s^-1 Peak XRT rate: 2.3 (±0.6) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 2.2 (±0.3) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 3.0 (±0.8) ×10^-3 ct s^-1 Mean XRT flux: 1.66 (±0.23) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 2.3 (±0.6) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~5.72×10^-4 [What is this?]
3 [details]	15h 28m 03.44s232.01434°	-28° 31′ 25.4″-28.52372°	5.1′′	Good	6.5′	2.6 ks	A SIMBAD object matches this source's position: (Show) AT20G J152803-283121, 6.8′′ away
Mean XRT rate: 2.6 (±0.9) ×10^-3 ct s^-1 Peak XRT rate: 2.6 (±0.9) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (PSPC count-rate) Products: Light curve \| Spectrum \| Expected serendipitous sources: ~2.65×10^-3 [What is this?]

Image

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FITS image.

Exposure map

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FITS exposure map.