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Swift Trigger: 773509

Presumed name: GRB 170921A

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

BAT	01h 47m 23.76s, +30° 52′ 26.4″
position:	(26.849, 30.874 ± 180″)
XRT	01h 47m 23.69s, +30° 54′ 23.4″
position:	(26.8487, 30.9065 ± 2.1″)
UVOT	No position available.
Galactic NHI:	4.65×100 cm-2
Galactic E(B-V):	0.051 mag

Best RA:	01h 47m 23.69s	= 26.8487 d
Best Dec:	+30° 54′ 23.4″	= 30.9065 d
Gal Lat:	-30.45
Gal Long:	136.85
Sun angle:	138.71°, 10.1 hr West

¹Sper #5 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 9 SPER messages, and 1 objects have been found

• • Object 1 - enhanced position.
  • RA (J2000) : 01 47 23.70 (30.9067)
  • Dec (J2000): +30 54 24.1 ( 30.90628)
  • Error (90%): 2.1
  • Counts in Source: 165

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
0.7′′	26.84870	30.90670		GCN #21904	GRB 170921A: Swift-XRT refined Analysis
1.3′′	26.84904	30.90672		GCN #21906	GRB 170921A: Enhanced Swift-XRT position
1.6′′	26.84846	30.90689		GCN #21901	GRB 170921A: Swift detection of a burst
99.1′′	26.84000	30.88000		GCN #21912	GRB 170921A: Swift-BAT refined analysis

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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
21.6	26.8526	30.9015		B=22.0, R=20.0	APM-N
27.9	26.8411	30.9106		B=22.0, R=18.3	APM-N
62.2	26.8425	30.9229		B2=20.9, I=18.3, R2=20.3	USNO-B1
65.3	26.8415	30.9236		B=20.9, R=19.1	APM-N
69.1	26.8280	30.8991		B1=20.7, R2=20.1	USNO-B1
90.1	26.8208	30.8989			NED
91.6	26.8307	30.9268		B=22.0, R=19.0	APM-N
96.6	26.8560	30.9326		B=21.8, R=20.0	APM-N
98.3	26.8259	30.9256		B=21.8, R=20.0	APM-N
106.2	26.8296	30.9311			NED

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

There are 44 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
27.6	26.8410	30.9104	h=16.1, j=16.7, k=15.6	2MASS
28.0	26.8409	30.9105	B2=20.9, I=18.0, R1=18.8, R2=19.4	USNO-B1
33.2	26.8411	30.9131	B1=20.5, B2=20.8	USNO-B1
64.8	26.8415	30.9234	B1=20.3, B2=20.2, I=17.8, R1=18.7, R2=18.9	USNO-B1
70.5	26.8274	30.8995	B1=20.4, B2=21.0, R2=20.0	USNO-B1
73.2	26.8494	30.8862	B2=20.9, I=18.0, R2=20.2	USNO-B1
73.4	26.8493	30.8861	h=15.5, j=16.2, k=15.1	2MASS
73.8	26.8264	30.8991	B1=20.4, B2=20.9, R2=20.3	USNO-B1
73.9	26.8543	30.8865	B1=19.2, B2=19.1, I=17.4, R1=18.4, R2=18.7	USNO-B1
82.6	26.8354	30.8866	B1=20.3, B2=20.7, I=17.6, R1=18.8, R2=19.0	USNO-B1

Queried USNO-B1, SDSS, 2MASS.

There are 84 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.