GRB 201208A: Swift observation summary

Mission:	Fermi/LAT
GRB RA:	158.314°
GRB Dec:	-28.750°
GRB Err:	12.0 arcmin
T0:	2020-12-08 06:03:23 UT
Galactic:	269.65° +25.05°
Galactic N_H:	4.12× 10²⁰ cm^-2
Galactic E(B-V):	0.05862449

Sun distance:	85.09°
Sun angle:	6.48 [hr](West of Sun)
Moon distance:	40.16°
Visibility of this field.

Data analysed so far:

ObsID: 00021405001 with 3.4 ks exposure.
ObsID: 00021405002 with 2.0 ks exposure.

Source 2 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
2 [details]	10h 33m 17.64s158.32352°	-28° 43′ 11.6″-28.71989°	3.0′′	Good	1.9′	9.7 ks	The source is fading with 3.9-σ significance. The source is 5.3-σ above the 2SXPS limit.
Mean XRT rate: 7.21 (+1.03, -1.00) ×10^-3 ct s^-1 Peak XRT rate: 1.4 (±0.3) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.9 (±0.4) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 5.8 (±1.3) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.3 [What is this?]

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 5 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]	10h 32m 55.50s158.23126°	-28° 52′ 03.7″-28.86769°	5.3′′	Poor	8.3′	9.7 ks
Mean XRT rate: 2.5 (±0.7) ×10^-3 ct s^-1 Peak XRT rate: 2.5 (±0.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 9.6 (±2.6) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 9.6 (±2.6) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~1.4 [What is this?]
2 [details]	10h 33m 17.64s158.32352°	-28° 43′ 11.6″-28.71989°	3.0′′	Good	1.9′	9.7 ks	The source is fading with 3.9-σ significance. The source is 5.3-σ above the 2SXPS limit.
Mean XRT rate: 7.21 (+1.03, -1.00) ×10^-3 ct s^-1 Peak XRT rate: 1.4 (±0.3) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.9 (±0.4) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 5.8 (±1.3) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.3 [What is this?]
3 [details]	10h 32m 44.49s158.18536°	-28° 36′ 39.0″-28.61083°	3.7′′	Good	10.8′	9.7 ks	This source may be affected by extended emission Matches known X-ray source: 2SXPS J103244.6-283637 (from 2SXPS), 2.8″ away. Matches SIMBAD source: ESO 436-34, 0.4″ away.
Mean XRT rate: 9.3 (+1.3, -1.2) ×10^-3 ct s^-1 Peak XRT rate: 1.5 (±0.4) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.24 (+0.18, -0.17) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 2.1 (±0.5) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.2 [What is this?]
4 [details]	10h 32m 33.56s158.13985°	-28° 37′ 30.0″-28.62500°	5.1′′	Poor	11.8′	4.5 ks
Mean XRT rate: 1.7 (+1.0, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 1.7 (+1.0, -0.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Expected serendipitous sources: ~2.3 [What is this?]
5 [details]	10h 32m 43.28s158.18034°	-28° 37′ 17.0″-28.62138°	5.9′′	Poor	10.4′	9.7 ks	This source may be affected by extended emission
Mean XRT rate: 1.5 (+0.6, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 1.5 (+0.6, -0.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Expected serendipitous sources: ~2.5 [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.

Image

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FITS image.

Exposure map

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FITS exposure map.