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Swift Trigger: 780845

Presumed name: GRB 171020A

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Related pages: Burst Analyser | Enhanced position | Light curve | Spectrum | Image | XRT Catalogue entry | Download obs data | GCN Notices

BAT	02h 37m 02.88s, +15° 11′ 09.6″
position:	(39.262, 15.186 ± 180″)
XRT	02h 36m 59.57s, +15° 12′ 13.7″
position:	(39.2482, 15.2038 ± 2.2″)
UVOT	No position available.
Galactic NHI:	9.70×100 cm-2
Galactic E(B-V):	0.179 mag

Best RA:	02h 36m 59.57s	= 39.2482 d
Best Dec:	+15° 12′ 13.7″	= 15.2038 d
Gal Lat:	-40.52
Gal Long:	157.28
Sun angle:	165.85°, 11.1 hr West

¹Sper #2 auto processing.

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GCN Notices for this burst.

View this region in Aladin.

Observability of this burst for Swift.

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Sun angle for this burst.

UVOT data

Blink images with DSS (link via GSFC)

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XRT SPER data

SPER results page for this trigger.

There are 12 SPER messages, and 1 objects have been found

• • Object 1 - enhanced position.
  • RA (J2000) : 02 36 59.57 (15.2041)
  • Dec (J2000): +15 12 14.9 ( 15.20429)
  • Error (90%): 2.0
  • Counts in Source: 377

See the SPER page for details of how this position was produced.

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Known transients within 5′ of the GRB

Click on the offset to view the transient announcement.

Offset (′′)	RA	Dec	Date reported	Source	Misc	Query
0.0′′	39.24820	15.20380		GCN #22028	GRB 171020A: Swift detection of a burst
1.3′′	39.24837	15.20413		GCN #22034	GRB 171020A: Enhanced Swift-XRT position
2.4′′	39.24842	15.20444		GCN #22029	GRB 171020A: NOT optical afterglow detection
37.9′′	39.23954	15.21022		GCN #22031	GRB 171020A: Confirmation of OT fading
42.9′′	39.25958	15.19917		GCN #22038	GRB 171020A: Swift-BAT refined analysis

There are 12 matches in total. See the full table for details.

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Catalogue Searches. Searched 3.33′ around XRT position

Click on the distance to view the full details (not available for sources from the SSS catalogue). Click on the column headers to sort the table on that column (click again to invert sort order).

SIMBAD

	RA*	Dec*	SIMBAD name		Query

* RA/Dec in equinox J2000

X-ray sources

	RA*	Dec*		Source table2	Observatory	Query

Queried the X-ray MASTER catalogue.

* RA/Dec in equinox J2000

¹Energy band for count-rate is mission specific.

Galaxies

	RA*	Dec*	Redshift		Catalogue	Query
24.5	39.2475	15.1970		B1=21.1, B2=20.6, I=17.0, R1=18.7, R2=18.5	USNO-B1
25.4	39.2474	15.1968		B=21.3, R=18.3	APM-N
38.0	39.2395	15.2102		B1=17.9, B2=17.4, I=16.3, R1=16.9, R2=16.6	USNO-B1
58.4	39.2333	15.1964		B=21.8, R=19.2	APM-N
91.2	39.2615	15.1819		B=21.8, R=19.6	APM-N
100.7	39.2193	15.2010		B=21.8, R=19.8	APM-N
112.5	39.2438	15.1728		B=21.8, R=20.0	APM-N
115.7	39.2236	15.1821		I=18.6, R2=19.5	USNO-B1
119.3	39.2216	15.2248		B=21.6, R=19.5	APM-N
149.4	39.2054	15.1998		B=21.8, R=20.0	APM-N

Queried APM-N, SDSS, PSCz, SSS, NED, 2MASSX, USNO-B1.

There are 13 galaxies within the position error. The full list is here.

* RA/Dec in equinox J2000

Magnitudes depend on the catalogue. e.g. For Sloan, R is the Sloan r mag, not the Johnson R from APM, for example

Stars

	RA*	Dec*		Catalogue	Query
24.8	39.2475	15.1970	h=14.5, j=15.2, k=14.4	2MASS
33.1	39.2456	15.2126	h=16.2, j=16.5, k=15.3	2MASS
37.9	39.2395	15.2102	h=15.3, j=15.6, k=15.0	2MASS
58.4	39.2331	15.1966	B2=20.8, R1=19.3, R2=19.5	USNO-B1
65.1	39.2516	15.1860	B1=20.5, B2=19.5, I=18.3, R1=19.0, R2=18.6	USNO-B1
70.4	39.2678	15.2086	B2=21.0, I=18.5, R1=19.2, R2=18.9	USNO-B1
90.9	39.2614	15.1820	R1=19.8, R2=19.8	USNO-B1
92.9	39.2306	15.2232	h=14.4, j=15.0, k=14.2	2MASS
93.3	39.2305	15.2233	B1=20.9, B2=20.4, I=16.8, R1=18.4, R2=18.3	USNO-B1
103.8	39.2697	15.1838	B1=21.1, I=18.3, R2=19.7	USNO-B1

Queried USNO-B1, SDSS, 2MASS.

There are 42 stars within the position error. The full list is here.

* RA/Dec in equinox J2000

Magnitudes depend on the catalogue. e.g. For Sloan, R is the Sloan r mag, not the Johnson R from APM, for example.