GRB 201227A: Swift observation summary

Mission:	IPN
GRB RA:	170.121°
GRB Dec:	-73.613°
GRB Err:	20.0 arcmin
T0:	2020-12-27 15:14:07 UT
Galactic:	296.53° -11.88°
Galactic N_H:	1.06× 10²¹ cm^-2
Galactic E(B-V):	0.3656949

Sun distance:	72.27°
Sun angle:	7.12 [hr](West of Sun)
Moon distance:	113.55°
Visibility of this field.

About tiled field analysis.

So far 4 fields have been scheduled for observations. Data are available and processed for 4 of these. The list gives the exposure time used in source detection. If any individual sources were selected for follow-up observations, the source detection is not repeated for the follow up observations and the table below is not updated.

21410 — 1.9 ks of cleaned data taken between 2020-12-28 05:34:52 and 2020-12-28 13:38:50
21411 — 1.8 ks of cleaned data taken between 2020-12-28 05:42:13 and 2020-12-28 13:34:40
21412 — 1.8 ks of cleaned data taken between 2020-12-28 05:49:35 and 2020-12-28 13:35:45
21413 — 1.9 ks of cleaned data taken between 2020-12-28 05:56:32 and 2020-12-28 13:36:59

Find an upper limit.

Sources found so far

So far 4 sources have been found in the XRT data. 1 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from IPN pos	Exposure	Notes
1 [details]	11h 22m 25.99s170.60831°	-73° 29′ 16.9″-73.48804°	7.4′′	Good	11.2′	3.8 ks	This source may be affected by optical loading
Mean XRT rate: 4.4 (+1.7, -1.4) ×10^-3 ct s^-1 Peak XRT rate: 4.4 (+1.7, -1.4) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 9.0 (+3.5, -2.8) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 9.0 (+3.5, -2.8) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum Expected serendipitous sources: ~1.9 [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.88°
2 [details]	11h 22m 28.57s170.61904°	-73° 28′ 47.2″-73.47976°	4.8′′	Good	11.6′	3.8 ks	This source may be affected by optical loading
Mean XRT rate: 3.6 (+1.6, -1.3) ×10^-3 ct s^-1 Peak XRT rate: 3.6 (+1.6, -1.3) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.06 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.3 (+0.6, -0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.3 (+0.6, -0.5) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum Expected serendipitous sources: ~1.7 [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.88°
3 [details]	11h 19m 24.19s169.85079°	-73° 35′ 11.9″-73.58665°	5.6′′	Good	4.8′	3.4 ks
Mean XRT rate: 2.8 (+1.4, -1.1) ×10^-3 ct s^-1 Peak XRT rate: 2.8 (+1.4, -1.1) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Products: Light curve
4 [details]	11h 25m 10.87s171.29527°	-73° 37′ 57.4″-73.63262°	4.4′′	Good	19.9′	1.7 ks	This source is affected by optical loading. Matches SIMBAD source: HD 99441, 3.6″ away.
Mean XRT rate: 4.2 (+2.6, -1.9) ×10^-3 ct s^-1 Peak XRT rate: 4.2 (+2.6, -1.9) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (XRT equiv count-rate) Products: Light curve Expected serendipitous sources: ~1.8 [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-11.88°

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.