Swift Trigger: 741965

Presumed name: GRB 170311A

BAT	18^h 42^m 15.12^s, -30° 03′ 46.4″
position:	(280.563, -30.0629 ± 180″)
XRT	18^h 42^m 21.43^s, -30° 02′ 44.9″
position:	(280.5893, -30.0458 ± 2.1″)
UVOT	No position available.
Galactic N_HI:	8.57×10⁰ cm^-2
Galactic E(B-V):	0.147 mag

Best RA:	18^h 42^m 21.43^s	= 280.5893 d
Best Dec:	-30° 02′ 44.9″	= -30.0458 d

Gal Lat:	-11.41
Gal Long:	4.86

Sun angle:	71.89°, 4.74 hr West

¹Sper #4 auto processing.

GCN Notices for this burst.

View this region in Aladin.

Observability of this burst for Swift.

Sun angle for this burst.

UVOT data

No UVOT images are currently available.

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) : 18 42 21.43 (-30.0456)
- Dec (J2000): -30 02 44.1 ( -30.04548)
- Error (90%): 2.1
- Counts in Source: 147

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

Known transients within 5′ of the GRB

Click on the offset to view the transient announcement.

Offset (′′)	RA	Dec	Source	Misc
0.0′′	280.58930	-30.04580	GCN #20846	GRB 170311A: Swift detection of a burst
0.7′′	280.58942	-30.04597	GCN #20850	GRB 170311A: Enhanced Swift-XRT position
157.2′′	280.53917	-30.04086	GCN #20855	GRB 170311A: Swift-BAT refined analysis

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
19.0	280.5949	-30.0480	OGLE BLG-RRLYR-36829	I=17.518, V=18.327

* 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*		Catalogue
6.6	280.5904	-30.0442	B2=18.1, R1=18.2, R2=18.0	USNO-B1
10.9	280.5901	-30.0429	B2=18.4, R1=18.0, R2=18.1	USNO-B1
11.3	280.5929	-30.0462	B1=19.1, B2=18.6, R1=16.9, R2=17.0	USNO-B1
14.0	280.5851	-30.0445	B=20.0	SSS
14.1	280.5848	-30.0462	B2=18.5, R1=17.6, R2=17.3	USNO-B1
14.2	280.5855	-30.0436	B2=18.2, R1=16.9, R2=16.9	USNO-B1
14.9	280.5858	-30.0430	B2=18.3, R1=17.7, R2=17.1	USNO-B1
15.5	280.5851	-30.0480	B2=18.9, R1=16.0	USNO-B1
16.8	280.5898	-30.0412	B=20.5	SSS
20.4	280.5953	-30.0435	B2=19.1, R1=18.3, R2=18.4	USNO-B1

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

There are 986 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
8.0	280.5898	-30.0436	B2=18.6, R1=17.3, R2=18.3	USNO-B1
8.3	280.5870	-30.0447	B2=18.7, R1=16.8, R2=18.4	USNO-B1
11.5	280.5884	-30.0489	B2=17.9, R1=18.7	USNO-B1
11.7	280.5921	-30.0480	h=13.2, j=13.7, k=13.0	2MASS
12.1	280.5924	-30.0478	B1=16.1, I=14.2, R1=14.7, R2=14.0	USNO-B1
12.4	280.5873	-30.0488	B1=16.6, B2=16.3, I=14.8, R1=15.1, R2=15.3	USNO-B1
13.5	280.5870	-30.0490	h=14.9, j=15.2, k=14.6	2MASS
13.8	280.5856	-30.0437	h=15.4, j=15.8, k=15.3	2MASS
14.7	280.5848	-30.0445	B2=18.9, R1=18.2, R2=17.4	USNO-B1
15.7	280.5853	-30.0485	B1=17.7, B2=17.4, I=16.1, R1=16.2, R2=16.1	USNO-B1

Queried USNO-B1, SDSS, 2MASS.

There are 1232 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.