GRB 210618A: Swift observation summary

Mission:	Swift-BAT
GRB RA:	235.820°
GRB Dec:	+46.043°
GRB Err:	3.0 arcmin
T0:	2021-06-18 01:43:37 UT
Galactic:	73.78° +51.29°
Galactic N_H:	1.27× 10²⁰ cm^-2
Galactic E(B-V):	0.01485922

Sun distance:	105.08°
Sun angle:	9.93 [hr] (East of Sun)
Moon distance:	63.31°
Visibility of this field.

Data analysed so far:

ObsID: 01056426000 with 1.1 ks exposure.
ObsID: 01056426001 with 5.9 ks exposure.
ObsID: 01056426002 with 3.3 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.

Find an upper limit.

Sources found so far

So far 17 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]	15h 43m 32.87s235.88695°	+46° 01′ 31.0″46.02528°	8.9′′	Good	3.0′	10.4 ks
Mean XRT rate: 3.8 (+0.8, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 4.2 (+1.5, -1.2) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.09 (+0.23, -0.21) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.2 (±0.4) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.05 [What is this?]
2 [details]	15h 43m 04.75s235.76979°	+46° 04′ 08.6″46.06907°	9.3′′	Good	2.6′	10.4 ks
Mean XRT rate: 2.9 (±0.8) ×10^-3 ct s^-1 Peak XRT rate: 2.9 (±0.8) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 9.5 (±2.5) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 9.5 (±2.5) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.08 [What is this?]
3 [details]	15h 43m 24.95s235.85395°	+45° 54′ 38.6″45.91072°	8.7′′	Poor	8.1′	10.4 ks	This source may be affected by extended emission
Mean XRT rate: 2.2 (+0.7, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 2.2 (+0.8, -0.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 6.0 (+1.9, -1.5) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 5.8 (+2.2, -1.8) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.9 [What is this?]
4 [details]	15h 42m 52.39s235.71831°	+46° 02′ 01.0″46.03362°	8.7′′	Good	4.3′	10.4 ks
Mean XRT rate: 1.6 (+0.7, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 1.6 (+0.7, -0.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 7.8 (+3.2, -2.6) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 7.8 (+3.2, -2.6) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.4 [What is this?]
5 [details]	15h 43m 48.90s235.95375°	+46° 06′ 09.0″46.10250°	8.4′′	Reasonable	6.6′	10.3 ks
Mean XRT rate: 2.2 (+0.7, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 2.5 (+0.9, -0.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 5.6 (+1.8, -1.4) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 6.5 (+2.3, -1.9) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~0.6 [What is this?]
6 [details]	15h 43m 08.80s235.78669°	+46° 07′ 43.6″46.12877°	8.6′′	Poor	5.3′	10.4 ks
Mean XRT rate: 2.2 (+1.0, -0.8) ×10^-3 ct s^-1 Peak XRT rate: 2.2 (+1.0, -0.8) ×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: ~0.4 [What is this?]
7 [details]	15h 42m 41.83s235.67431°	+46° 07′ 14.8″46.12077°	8.8′′	Reasonable	7.7′	10.4 ks
Mean XRT rate: 9 (+6, -4) ×10^-4 ct s^-1 Peak XRT rate: 9 (+6, -4) ×10^-4 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Expected serendipitous sources: ~2.6 [What is this?]
8 [details]	15h 43m 19.19s235.82997°	+45° 54′ 51.6″45.91433°	8.7′′	Good	7.7′	10.4 ks
Mean XRT rate: 1.6 (+0.6, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 1.8 (+0.7, -0.6) ×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: ~1.2 [What is this?]
9 [details]	15h 42m 42.97s235.67904°	+46° 09′ 12.8″46.15357°	8.7′′	Good	8.9′	10.4 ks
Mean XRT rate: 2.1 (+0.8, -0.6) ×10^-3 ct s^-1 Peak XRT rate: 2.1 (+0.8, -0.6) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.05 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: ~1.2 [What is this?]
10 [details]	15h 44m 02.32s236.00965°	+45° 57′ 19.5″45.95541°	9.3′′	Poor	9.5′	10.4 ks	Matches SIMBAD source: NVSS J154402+455721, 3.3″ away.
Mean XRT rate: 1.3 (+0.7, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 1.3 (+0.7, -0.5) ×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: ~2.7 [What is this?]
11 [details]	15h 43m 42.63s235.92762°	+46° 12′ 31.2″46.20867°	9.8′′	Good	10.9′	5.3 ks	Matches SIMBAD source: [VV2006] J154342.4+461233, 2.9″ away.
Mean XRT rate: 2.78 (+1.24, -0.87) ×10^-3 ct s^-1 Peak XRT rate: 2.78 (+1.23, -0.95) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Expected serendipitous sources: ~1.1 [What is this?]
12 [details]	15h 43m 26.28s235.85952°	+45° 55′ 56.9″45.93248°	8.2′′	Good	6.8′	10.4 ks
Mean XRT rate: 1.2 (+0.6, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 1.2 (+0.6, -0.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 1.8 (+0.9, -0.7) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.8 (+0.9, -0.7) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~1.5 [What is this?]
13 [details]	15h 42m 21.83s235.59094°	+45° 56′ 28.5″45.94125°	9.9′′	Good	11.3′	10.4 ks
Mean XRT rate: 1.7 (+0.7, -0.5) ×10^-3 ct s^-1 Peak XRT rate: 1.7 (+0.8, -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: 9.3 (+3.6, -2.7) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 9 (+4, -3) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Expected serendipitous sources: ~2.5 [What is this?]
14 [details]	15h 43m 24.04s235.85015°	+45° 53′ 54.1″45.89837°	9.8′′	Poor	8.8′	10.4 ks	This source may be affected by extended emission
Mean XRT rate: 9 (+6, -4) ×10^-4 ct s^-1 Peak XRT rate: 1.52 (+1.50, -0.92) ×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: ~3.4 [What is this?]
15 [details]	15h 43m 09.72s235.79048°	+45° 55′ 08.3″45.91898°	9.9′′	Poor	7.5′	10.4 ks
Mean XRT rate: 4.8 (+3.7, -2.3) ×10^-4 ct s^-1 Peak XRT rate: 5 (+5, -3) ×10^-4 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Products: Light curve \| Expected serendipitous sources: ~0.00×10⁺⁰ [What is this?]
16 [details]	15h 43m 42.60s235.92748°	+45° 58′ 04.1″45.96781°	8.9′′	Good	6.4′	10.4 ks
Mean XRT rate: 1.3 (+1.0, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 1.3 (+1.0, -0.7) ×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: ~1.2 [What is this?]
17 [details]	15h 42m 26.03s235.60844°	+45° 55′ 25.4″45.92373°	8.6′′	Poor	11.4′	10.4 ks
Mean XRT rate: 1.2 (+0.6, -0.4) ×10^-3 ct s^-1 Peak XRT rate: 2.19 (+1.34, -0.95) ×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: ~4.2 [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.

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FITS exposure map.