GRB 210218A: Swift observation summary

Mission:	Swift-BAT
GRB RA:	47.291°
GRB Dec:	+35.287°
GRB Err:	3.0 arcmin
T0:	2021-02-18 13:35:19 UT
Galactic:	152.27° -19.62°
Galactic N_H:	1.13× 10²¹ cm^-2
Galactic E(B-V):	0.2044283

Sun distance:	84.76°
Sun angle:	5.01 [hr](East of Sun)
Moon distance:	20.88°
Visibility of this field.

Data analysed so far:

ObsID: 01033328002 with 2.7 ks exposure.
ObsID: 01033328003 with 3.9 ks exposure.

Source 3 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 Swift-BAT pos	Exposure	Notes	Vizier
3 [details]	03h 09m 17.67s47.32362°	+35° 19′ 26.5″35.32402°	4.8′′	Good	2.7′	6.6 ks	The source is fading with 3.1-σ significance.
Mean XRT rate: 5.6 (+2.0, -1.6) ×10^-3 ct s^-1 Peak XRT rate: 5.6 (+2.0, -1.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Expected serendipitous sources: ~0.03 [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-19.62°

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 11 sources have been found in the XRT data. 2 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from Swift-BAT pos	Exposure	Notes
1 [details]	03h 08m 45.77s47.19071°	+35° 27′ 40.5″35.46125°	3.9′′	Good	11.5′	6.6 ks	This source may be affected by optical loading Matches SIMBAD source: TYC 2347-941-1, 4.6″ away.
Mean XRT rate: 8.7 (+1.7, -1.5) ×10^-3 ct s^-1 Peak XRT rate: 1.3 (+0.7, -0.5) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.22 (+0.23, -0.21) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.9 (+1.0, -0.7) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-19.62°
2 [details]	03h 08m 34.56s47.14399°	+35° 16′ 33.9″35.27610°	5.0′′	Reasonable	7.2′	6.6 ks
Mean XRT rate: 2.04 (+1.34, -0.95) ×10^-3 ct s^-1 Peak XRT rate: 2.04 (+1.34, -0.95) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 3.8 (+2.5, -1.8) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 3.8 (+2.5, -1.8) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.7 [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-19.62°
3 [details]	03h 09m 17.67s47.32362°	+35° 19′ 26.5″35.32402°	4.8′′	Good	2.7′	6.6 ks	The source is fading with 3.1-σ significance.
Mean XRT rate: 5.6 (+2.0, -1.6) ×10^-3 ct s^-1 Peak XRT rate: 5.6 (+2.0, -1.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Expected serendipitous sources: ~0.03 [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-19.62°
4 [details]	03h 08m 28.32s47.11801°	+35° 14′ 05.0″35.23471°	4.8′′	Good	9.0′	6.6 ks
Mean XRT rate: 2.0 (+0.9, -0.6) ×10^-3 ct s^-1 Peak XRT rate: 1.95 (+1.01, -0.77) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 6.5 (+2.8, -2.0) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 6.4 (+3.3, -2.5) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~1.2 [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-19.62°
5 [details]	03h 08m 57.48s47.23951°	+35° 09′ 30.1″35.15837°	4.6′′	Good	8.1′	6.6 ks	Matches known X-ray source: 1RXS J030855.8+350852 (from ROSAT/RASSFSC), 42.9″ away.
Mean XRT rate: 1.9 (+0.9, -0.6) ×10^-3 ct s^-1 Peak XRT rate: 2.5 (+1.9, -1.3) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Products: Light curve \| Expected serendipitous sources: ~1.0 [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-19.62°
6 [details]	03h 09m 01.67s47.25697°	+35° 08′ 08.8″35.13577°	5.1′′	Poor	9.2′	6.6 ks
Mean XRT rate: 1.2 (+0.9, -0.6) ×10^-3 ct s^-1 Peak XRT rate: 1.2 (+0.9, -0.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-19.62°
7 [details]	03h 08m 45.25s47.18853°	+35° 12′ 00.6″35.20017°	4.4′′	Good	7.2′	6.6 ks
Mean XRT rate: 9 (+6, -4) ×10^-4 ct s^-1 Peak XRT rate: 1.44 (+1.14, -0.77) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Expected serendipitous sources: ~0.2 [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-19.62°
8 [details]	03h 08m 35.04s47.14602°	+35° 21′ 29.3″35.35815°	5.3′′	Good	8.3′	6.6 ks
Mean XRT rate: 1.9 (+0.8, -0.6) ×10^-3 ct s^-1 Peak XRT rate: 2.4 (+1.4, -1.0) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 4.2 (+1.8, -1.3) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 5.5 (+3.1, -2.3) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~1.1 [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-19.62°
9 [details]	03h 08m 40.19s47.16747°	+35° 14′ 44.3″35.24564°	5.4′′	Good	6.5′	6.6 ks
Mean XRT rate: 1.3 (+0.9, -0.6) ×10^-3 ct s^-1 Peak XRT rate: 1.3 (+0.9, -0.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.6 (+1.8, -1.3) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 2.6 (+1.8, -1.3) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~1.0 [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-19.62°
10 [details]	03h 09m 02.03s47.25846°	+35° 28′ 25.1″35.47364°	5.6′′	Reasonable	11.3′	4.7 ks
Mean XRT rate: 3.4 (+1.9, -1.3) ×10^-3 ct s^-1 Peak XRT rate: 6.0 (+3.6, -2.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 5.1 (+2.9, -2.0) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 9 (+5, -4) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.8 [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-19.62°
11 [details]	03h 08m 42.85s47.17855°	+35° 23′ 25.5″35.39041°	3.7′′	Good	8.3′	6.6 ks
Mean XRT rate: 4.8 (+1.1, -1.0) ×10^-3 ct s^-1 Peak XRT rate: 6.2 (±1.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 2.1 (±0.5) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.8 (±0.7) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position \| Expected serendipitous sources: ~0.3 [What is this?] Note: this is extragalactic sources only, whereas the GRB trigger is at b=-19.62°

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.

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FITS exposure map.