Swift Trigger: 755343

Presumed name: GRB 170531A

BAT	08^h 05^m 02.64^s, -14° 01′ 58.8″
position:	(121.261, -14.033 ± 180″)
XRT	08^h 05^m 00.58^s, -14° 01′ 21.7″
position:	(121.2524, -14.0227 ± 3.5″)
UVOT	No position available.
Galactic N_HI:	9.16×10⁰ cm^-2
Galactic E(B-V):	0.083 mag

Best RA:	08^h 05^m 00.58^s	= 121.2524 d
Best Dec:	-14° 01′ 21.7″	= -14.0227 d

Gal Lat:	9.32
Gal Long:	234.03

Sun angle:	62.87°, -3.5 hr East of Sun

¹Sper #1 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

white image

Blink images with DSS (link via GSFC)

XRT SPER data

SPER results page for this trigger.

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

- Object 1
- RA (J2000) : 08 05 00.91 ( 121.25380)
- Dec (J2000): -14 01 22.5 ( -14.02292)
- Error (90%): 4.528"
- Counts in Source: 12

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′′	121.25240	-14.02270	GCN #21180	GRB 170531A: Swift-XRT refined Analysis
4.0′′	121.25125	-14.02258	GCN #21176	GRB 170531A: ePESSTO NTT observations
4.9′′	121.25379	-14.02292	GCN #21170	GRB 170531A: Swift detection of a burst

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
119.3	121.2196	-14.0321	BD-13 2377	B=11.18, H=5.675, J=6.542, K=5.461, V=9.51

* 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
19.0	121.2525	-14.0174	B1=19.8, B2=19.6, I=18.5, R1=19.4, R2=18.7	USNO-B1
36.2	121.2521	-14.0327	B2=19.7, I=17.1, R1=18.8, R2=18.3	USNO-B1
39.8	121.2517	-14.0337	B2=19.4, I=16.1, R1=17.6	USNO-B1
43.9	121.2436	-14.0314	B1=20.2, R2=18.9	USNO-B1
47.9	121.2475	-14.0351	B2=19.7, R1=18.9, R2=18.9	USNO-B1
54.8	121.2504	-14.0076	B=22.2	SSS
57.8	121.2625	-14.0354	B2=19.6, R1=18.7, R2=18.5	USNO-B1
58.3	121.2624	-14.0356	B1=20.0, I=18.3	USNO-B1
62.1	121.2402	-14.0102	B1=18.9, B2=18.9, I=17.3, R1=17.2, R2=17.6	USNO-B1
62.1	121.2701	-14.0215	B1=17.9, B2=18.3, I=15.8, R1=15.8, R2=16.4	USNO-B1

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

There are 54 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
3.6	121.2514	-14.0225	h=15.5, j=16.1, k=15.4	2MASS
4.0	121.2513	-14.0226	B1=18.2, B2=18.4, I=16.5, R1=16.5, R2=16.9	USNO-B1
16.4	121.2516	-14.0272	B1=19.8, B2=19.7, I=18.1, R1=19.0, R2=18.8	USNO-B1
19.1	121.2543	-14.0277	B1=19.1, B2=19.1, I=17.6, R1=17.6, R2=18.1	USNO-B1
19.3	121.2557	-14.0184	B2=19.6, I=16.5, R1=19.6, R2=18.8	USNO-B1
20.4	121.2567	-14.0266	I=16.8, R1=16.3	USNO-B1
21.2	121.2495	-14.0175	B1=17.8, B2=18.3, I=16.3, R1=16.3, R2=16.6	USNO-B1
21.2	121.2495	-14.0175	h=15.4, j=15.9, k=15.5	2MASS
21.5	121.2567	-14.0269	h=15.7, j=16.0, k=15.4	2MASS
21.5	121.2566	-14.0270	B1=18.1, B2=18.5, I=16.3, R1=16.3, R2=16.8	USNO-B1

Queried USNO-B1, SDSS, 2MASS.

There are 381 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.