The Swift Gamma-Ray Burst Mission Italian site U.K. site

GRB 121102A

Redshift:
Host Galaxy:
Other Observatory Detections:
INTEGRAL

Time: 02:27:02
Trigger Number: 537266
Burst Advocate: Valerio D'Elia

Burst Alert Telescope (BAT):

RA
(J2000)
Dec
(J2000)
90% Error a
Radius
T90 b Fluence c
(15-150 keV)
1-sec Peak d
Photon Flux
(15-150 keV)
Photon Index e
(15-150 keV)
270.896
18:03:35.0
-16.951
-16:57:03.6
1.0 24.7 19 (1) 2.3 (0.2) 1.88, PL (0.07)

90% error in parentheses,
a arcmin; b seconds; c 10-7 erg/cm2; d ph/cm2/sec; e PL = simple power-law, CPL = cutoff power-law

X-Ray Telescope (XRT):

RA
(J2000)
Dec
(J2000)
90% Error a
Radius
Time to First b
Observation
Early Flux c
(0.3-10 keV)
11 Hour Flux c
(0.3-10 keV)
24 Hour Flux c
(0.3-10 keV)
Initial d
LC Index
Spectral
Index
(Gamma)
Column e
Density
(NH)
18:03:36.22 -16:57:28.4 1.4 47.73 345 0.033925059 0.014773659 -3.296 1.77855 8.00045

a arcsec; b seconds; c 10-11 erg/cm2/s; d temporal; e 1021 cm-2

Note: Please be aware that only the very basic temporal and spectral quantities are reported here. You are strongly encouraged to see the referenced GCN circulars for full details.

» XRT GRB Live Catalogue
» XRT Light Curves
» XRT Spectra

UltraViolet/Optical Telescope (UVOT):

RA
(J2000)
Dec
(J2000)
90% Error a
Radius
Time to First b
Observation
Magnitude Other Filter
Magnitudes
n/a n/a n/a 58 V>20.0 B>21.4
U>20.9
UVW1>20.8
UVM2>21.1
UVW2>21.2
White>21.4

a arcsec; b seconds

Comments:

This event has all appearances of a GRB: hard BAT spectrum, bright XRT initial detection and fading. Still, we note that the galactic coordinates are l=12 deg, b=2.5 deg, consistent with a galactic origin. We believe it is a GRB, but can not rule out a new galactic transient.
UVOT: no detection

References:

BAT: GCN 13938; GCN 13942
XRT: GCN 13938; GCN 13943; GCN 13945; Evans et al., 2009, MNRAS, 397, 1177
UVOT: GCN 13938; GCN 13948
Radio:
Redshift:
Host:
Other: GCN Report 401.1

BAT Light Curve:

BAT Light Curve for GRBblc/121102A.png