Swift Trigger: 537266

Presumed name: GRB 121102A

BAT	18^h 03^m 36.72^s, -16° 57′ 57.6″
position:	(270.903, -16.966 ± 180″)
XRT	18^h 03^m 36.22^s, -16° 57′ 28.1″
position:	(270.9009, -16.9578 ± 2.1″)
UVOT	No position available.
Galactic N_HI:	5.33×10²¹ cm^-2
Galactic E(B-V):	NED unavailable

Best RA:	18^h 03^m 36.22^s	= 270.9009 d
Best Dec:	-16° 57′ 28.1″	= -16.9578 d

Gal Lat:	2.49
Gal Long:	12.43

Sun angle:	51.27°, -3.6 hr East of Sun

¹Sper #3 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

u image

white image

Blink images with DSS (link via GSFC)

XRT SPER data

SPER results page for this trigger.

There are 8 SPER messages, and 1 objects have been found

- Object 1 - enhanced position.
- RA (J2000) : 18 03 36.22 (-16.9577)
- Dec (J2000): -16 57 27.9 ( -16.95717)
- Error (90%): 2.0
- Counts in Source: 420

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′′	270.90090	-16.95780	GCN #13938	GRB 121102A: Swift detection of a burst
0.5′′	270.90100	-16.95789	GCN #13945	GRB 121102A: Enhanced Swift-XRT position
0.6′′	270.90092	-16.95764	GCN #13943	GRB 121102A: Swift-XRT refined Analysis
29.4′′	270.89625	-16.95094	GCN #13942	GRB 121102A: 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
94.7	270.8935	-16.9325	TYC 6255-20-1	B=12.50, V=11.88

* 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
9.9	270.8981	-16.9583	I=18.1, R1=18.2, R2=19.8	USNO-B1
13.9	270.9011	-16.9617	B=20.4	SSS
16.6	270.9056	-16.9590	I=18.7, R1=25.9	USNO-B1
20.9	270.9048	-16.9623	I=17.4, R2=20.5	USNO-B1
26.2	270.9016	-16.9651	B2=18.6, I=15.8, R1=18.5, R2=16.4	USNO-B1
28.5	270.9061	-16.9516	I=17.7, R2=20.1	USNO-B1
31.3	270.9099	-16.9568	I=17.7, R2=17.9	USNO-B1
31.4	270.9011	-16.9665	B2=19.4, I=16.6, R2=17.2	USNO-B1
33.4	270.8917	-16.9606	R1=17.8, R2=18.0	USNO-B1
33.4	270.8976	-16.9491	I=18.7, R2=21.0	USNO-B1

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

There are 588 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
4.3	270.9012	-16.9566	B2=21.8, I=18.1, R2=19.5	USNO-B1
4.5	270.8996	-16.9575	B2=22.4, I=17.2, R1=17.5, R2=17.5	USNO-B1
7.2	270.8988	-16.9578	I=18.5, R2=17.6	USNO-B1
7.8	270.9007	-16.9599	R1=18.9, R2=19.3	USNO-B1
10.4	270.9001	-16.9550	I=18.8, R2=19.1	USNO-B1
10.4	270.8992	-16.9602	I=17.8, R2=18.7	USNO-B1
10.5	270.8979	-16.9585	h=14.9, j=16.1, k=15.1	2MASS
10.8	270.9038	-16.9590	I=18.1, R1=20.4, R2=20.1	USNO-B1
11.2	270.9032	-16.9556	I=17.5, R2=17.1	USNO-B1
12.1	270.9036	-16.9557	B2=19.6, I=15.6, R1=15.8, R2=15.9	USNO-B1

Queried USNO-B1, SDSS, 2MASS.

There are 2385 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.