GRB 230812B: Swift observation summary

Mission:	Fermi/LAT
GRB RA:	249.100°
GRB Dec:	+47.750°
GRB Err:	7.8 arcmin
T0:	2023-08-12 18:58:12 UT
Galactic:	74.08° +42.07°
Galactic N_H:	1.89× 10²⁰ cm^-2
Galactic E(B-V):	0.02169549

Sun distance:	90.04°
Sun angle:	7.14 [hr] (East of Sun)
Moon distance:	99.09°
Visibility of this field.
First slew:	2023-08-12 21:15:12 UT
First observation:	2023-08-12 21:11:42 UT
First analysis:	UT

Source 7 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 tiled field analysis.

So far 31 fields have been scheduled for observations. Data are available and processed for 29 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.

21589 — 1.3 ks of cleaned data taken between 2023-08-12 21:12:15 and 2023-08-15 17:53:25
21590 — 67 s of cleaned data taken between 2023-08-12 21:15:10 and 2023-08-12 21:17:14
21593 — 70 s of cleaned data taken between 2023-08-12 21:24:22 and 2023-08-12 21:27:22
21594 — 160 s of cleaned data taken between 2023-08-12 21:27:26 and 2023-08-12 21:30:31
21595 — 157 s of cleaned data taken between 2023-08-12 21:30:33 and 2023-08-12 21:33:35
21596 — 160 s of cleaned data taken between 2023-08-12 21:33:39 and 2023-08-12 21:36:44
21597 — 145 s of cleaned data taken between 2023-08-12 21:36:46 and 2023-08-12 21:39:53
21598 — 127 s of cleaned data taken between 2023-08-12 21:39:56 and 2023-08-12 21:43:03
21599 — 155 s of cleaned data taken between 2023-08-12 21:43:06 and 2023-08-12 21:46:09
21600 — 157 s of cleaned data taken between 2023-08-12 21:46:12 and 2023-08-12 21:49:12
21601 — 157 s of cleaned data taken between 2023-08-12 21:49:16 and 2023-08-12 21:52:23
21602 — 183 s of cleaned data taken between 2023-08-13 00:20:29 and 2023-08-13 00:26:38
21603 — 160 s of cleaned data taken between 2023-08-13 00:26:41 and 2023-08-13 00:29:49
21604 — 112 s of cleaned data taken between 2023-08-12 22:45:45 and 2023-08-12 22:49:59
21605 — 157 s of cleaned data taken between 2023-08-12 22:50:02 and 2023-08-12 22:53:04
21606 — 160 s of cleaned data taken between 2023-08-12 22:53:07 and 2023-08-12 22:56:16
21607 — 157 s of cleaned data taken between 2023-08-12 22:56:20 and 2023-08-12 22:59:24
21608 — 160 s of cleaned data taken between 2023-08-12 22:59:27 and 2023-08-12 23:02:34
21609 — 160 s of cleaned data taken between 2023-08-12 23:02:37 and 2023-08-12 23:05:47
21610 — 160 s of cleaned data taken between 2023-08-12 23:05:49 and 2023-08-12 23:08:56
21611 — 160 s of cleaned data taken between 2023-08-12 23:09:00 and 2023-08-12 23:12:09
21612 — 145 s of cleaned data taken between 2023-08-12 23:12:12 and 2023-08-12 23:15:25
21613 — 130 s of cleaned data taken between 2023-08-12 23:15:29 and 2023-08-12 23:18:35
21614 — 157 s of cleaned data taken between 2023-08-12 23:18:37 and 2023-08-12 23:21:48
21615 — 152 s of cleaned data taken between 2023-08-12 23:21:51 and 2023-08-12 23:24:51
21616 — 157 s of cleaned data taken between 2023-08-12 23:24:55 and 2023-08-12 23:28:00
21617 — 160 s of cleaned data taken between 2023-08-13 00:29:51 and 2023-08-13 00:33:02
21618 — 160 s of cleaned data taken between 2023-08-13 00:33:04 and 2023-08-13 00:36:09
21619 — 3.1 ks of cleaned data taken between 2023-08-13 02:00:04 and 2023-08-13 04:01:55

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
7 [details]	16h 36m 31.67s249.13196°	+47° 51′ 32.1″47.85892°	2.1′′	Good	6.7′	4.6 ks	The source is 4.3-σ above the RASS limit.
Mean XRT rate: 0.262 (±0.009) ct s^-1 Peak XRT rate: 0.54 (±0.12) ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 8.7 (±0.3) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 1.8 (±0.4) ×10^-11 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position

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.

Find an upper limit.

Sources found so far

So far 9 sources have been found in the XRT data. 7 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Dist from LAT pos	Exposure	Notes
1 [details]	16h 40m 24.03s250.10013°	+46° 42′ 07.5″46.70208°	6.0′′	Poor	1.2°	157 s	This source may be affected by optical loading Matches known X-ray source: XMMSL2 J164021.0+464226 (from XMM-NEWTON/XMMSLEWCLN), 7.1476431938108″ away. Matches SIMBAD source: [SER2007] ACO 2219 c1, 5.5″ away.
Mean XRT rate: 7.3 (+3.2, -2.5) ×10^-2 ct s^-1 Peak XRT rate: 7.3 (+3.2, -2.5) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate) Mean XRT flux: 6.1 (+2.7, -2.1) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 6.1 (+2.7, -2.1) ×10^-12 erg cm^-1s^-1 Products: Spectrum \| Enhanced position
2 [details]	16h 40m 14.31s250.05963°	+46° 43′ 28.0″46.72444°	8.0′′	Poor	1.2°	157 s	Matches known X-ray source: 4XMM J164014.6+464322 (from XMM-NEWTON/XMMSSC), 6.7328227449177″ away. Matches SIMBAD source: [RBL98] J164014+464318, 9.7″ away.
Mean XRT rate: 5.1 (+2.8, -2.1) ×10^-2 ct s^-1 Peak XRT rate: 5.1 (+2.8, -2.1) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate)
3 [details]	16h 40m 26.77s250.11153°	+46° 42′ 21.9″46.70608°	7.4′′	Reasonable	1.2°	157 s	This source may be affected by optical loading Matches known X-ray source: XMMSL2 J164021.0+464226 (from XMM-NEWTON/XMMSLEWCLN), 40.944592527011″ away.
Mean XRT rate: 9.7 (+3.5, -2.8) ×10^-2 ct s^-1 Peak XRT rate: 9.7 (+3.5, -2.8) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate)
4 [details]	16h 40m 18.34s250.07641°	+46° 41′ 58.1″46.69948°	7.2′′	Poor	1.2°	157 s	Matches known X-ray source: XMMSL2 J164021.0+464226 (from XMM-NEWTON/XMMSLEWCLN), 50.110853150692″ away. Matches SIMBAD source: [SHB95] Arc L2, 7.6″ away.
Mean XRT rate: 7.4 (+3.3, -2.5) ×10^-2 ct s^-1 Peak XRT rate: 7.4 (+3.3, -2.5) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (XRT equiv count-rate)
5 [details]	16h 40m 23.43s250.09764°	+46° 43′ 26.6″46.72406°	18.1′′	Poor	1.2°	157 s	Matches SIMBAD source: [BGB2004] 87, 7.7″ away.
Mean XRT rate: 5.7 (+2.8, -2.1) ×10^-2 ct s^-1 Peak XRT rate: 5.7 (+2.8, -2.1) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.15 ct s^-1 (XRT equiv count-rate)
6 [details]	16h 35m 33.72s248.89048°	+47° 40′ 46.2″47.67950°	7.5′′	Good	9.5′	4.6 ks	Matches SIMBAD source: BD+47 2358B, 8.8″ away.
Mean XRT rate: 3.7 (+1.3, -1.1) ×10^-3 ct s^-1 Peak XRT rate: 3.7 (+1.3, -1.1) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (XRT equiv count-rate)
7 [details]	16h 36m 31.67s249.13196°	+47° 51′ 32.1″47.85892°	2.1′′	Good	6.7′	4.6 ks	The source is 4.3-σ above the RASS limit.
Mean XRT rate: 0.262 (±0.009) ct s^-1 Peak XRT rate: 0.54 (±0.12) ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (XRT equiv count-rate) Mean XRT flux: 8.7 (±0.3) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 1.8 (±0.4) ×10^-11 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
8 [details]	16h 36m 55.08s249.22952°	+47° 52′ 27.4″47.87428°	4.0′′	Good	9.1′	3.2 ks
Mean XRT rate: 4.6 (+1.8, -1.5) ×10^-3 ct s^-1 Peak XRT rate: 4.6 (+1.8, -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: 8.4 (+3.3, -2.7) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 8.4 (+3.3, -2.7) ×10^-14 erg cm^-1s^-1 Products: Spectrum \| Enhanced position
9 [details]	16h 39m 35.23s249.89681°	+46° 21′ 14.1″46.35391°	11.3′′	Poor	1.5°	1.3 ks	Matches SIMBAD source: [RGD2013] J163933.878+462111.805, 14.2″ away.
Mean XRT rate: 7.1 (+3.8, -2.8) ×10^-3 ct s^-1 Peak XRT rate: 7.1 (+3.8, -2.8) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.01 ct s^-1 (XRT equiv count-rate)

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Exposure map

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FITS exposure map.