GRB 170121B: Swift observation summary

Mission:	Fermi/GBM
GRB RA:	72.574°
GRB Dec:	-9.267°
GRB Err:	0.6 arcsec
T0:	2017-01-21 14:44:03 UT
Galactic:	207.33° -31.09°
Galactic N_H:	4.46× 10²⁰ cm^-2
Galactic E(B-V):	0.0629658

Sun distance:	121.64°
Sun angle:	8.57 [hr](East of Sun)
Moon distance:	147.80°
Visibility of this field.

Data analysed so far:

ObsID: 00020729001 with 4.9 ks exposure.

About ToO analysis.

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Sources found so far

So far 5 sources have been found in the XRT data. 4 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from Fermi/GBM pos	Exposure	Notes
1 [details]	04h 50m 36.99s72.65414°	-09° 13′ 35.0″-9.22638°	11.4′′	Good	5.3′	4.9 ks	This source may be affected by extended emission Matches known X-ray source: 1RXS J045035.1-091330 (from ROSAT/RASSFSC), 28.484735526207″ away. Matches SIMBAD source: 2MASX J04503608-0913280, 15.1″ away.
Mean XRT rate: 7 (+8, -5) ×10^-4 ct s^-1 Peak XRT rate: 7 (+8, -5) ×10^-4 ct s^-1 RASS PSPC 3-σ upper limit: 0.07 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
2 [details]	04h 49m 33.22s72.38842°	-09° 12′ 11.0″-9.20305°	3.7′′	Good	11.6′	4.9 ks	Matches known X-ray source: MS0447.1-0917 (from EINSTEIN/EMSS), 4.8359431286445″ away. Matches SIMBAD source: QSO B0447-092, 4.7″ away.
Mean XRT rate: 1.01 (+0.20, -0.19) ×10^-2 ct s^-1 Peak XRT rate: 1.11 (±0.25) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 4.3 (±0.8) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 4.7 (±1.1) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.2 [What is this?]
3 [details]	04h 50m 32.62s72.63590°	-09° 14′ 31.3″-9.24204°	2.4′′	Good	4.0′	4.9 ks
Mean XRT rate: 9.0 (±1.9) ×10^-3 ct s^-1 Peak XRT rate: 9.0 (±1.9) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.10 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.7 (±0.8) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 3.7 (±0.8) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.02 [What is this?]
4 [details]	04h 50m 35.02s72.64591°	-09° 13′ 45.7″-9.22935°	9.6′′	Good	4.8′	4.9 ks	This source may be affected by extended emission Matches known X-ray source: 1RXS J045035.1-091330 (from ROSAT/RASSFSC), 15.69964116612″ away.
Mean XRT rate: 3.3 (+1.3, -1.0) ×10^-3 ct s^-1 Peak XRT rate: 3.3 (+1.3, -1.0) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.08 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: Light curve \| Spectrum \| Expected serendipitous sources: ~0.2 [What is this?]
5 [details]	04h 50m 35.44s72.64765°	-09° 13′ 13.0″-9.22027°	9.2′′	Good	5.2′	4.9 ks	This source may be affected by extended emission Matches known X-ray source: 1RXS J045035.1-091330 (from ROSAT/RASSFSC), 17.733592702415″ away.
Mean XRT rate: 3 (+6, -3) ×10^-4 ct s^-1 Peak XRT rate: 3 (+6, -3) ×10^-4 ct s^-1 RASS PSPC 3-σ upper limit: 0.07 ct s^-1 (XRT equiv count-rate) Products: Light curve \| 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.