GRB 120811A

Time: 02:35:18
Trigger Number: 530581
Burst Advocate: Binbin Zhang

BAT Data:

RA: a 257.184
Dec: a -22.735
90% Error Radius: b 2.6
T90: c 166
Fluence: d 11 (1)
1s Peak Photon Flux: e 1.0 (0.1)
Photon Index: f 1.95, PL (0.20)

90% error in parentheses,
a J2000; b arcmin; c seconds; d 10-7 erg/cm2 (15-150 keV); e ph/cm2/sec (15-150 keV); f PL = simple power-law, CPL = cutoff power-law (15-150 keV)

BAT Light Curve:

BAT Light Curve for GRB 120811A

XRT Data:

RA: a 17:08:39.70
Dec: a -22:42:38.0
90% Error Radius: b 2.8
Time to First Observation: c n/a
Early Flux: d n/a
11 Hour Flux: d 0.08926366
24 Hour Flux: d 0.052599426
Initial Temporal Index: -0.6779
Spectral Index (Gamma): 1.99897
Column Density (NH): e 8.66874

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.
a J2000; b arcsec; c seconds; d 10-11 erg/cm2/s (0.3-10 keV); e 1021 cm-2

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

UVOT Data:

RA: a n/a
Dec: a n/a
90% Error Radius: b n/a
Time to First Observation: c 5627
V Magnitude: V>19.1
Other Filter Magnitudes: B>20.2

a J2000; b arcsec; c seconds

Other Burst Info:

Host Galaxy:
Other Observatory Detections:


While the BAT lightcurve and spectral results are consistant with a GRB origin for this trigger, given that the galactic coordinates are (lon,lat)=(0.6,10.3) deg, we cannot rule out a galactic source origin.
XRT: The fact that the XRT source is fading suggests that Swift trigger 530581 is most likely a GRB.
UVOT: no detection


BAT: GCN 13618; GCN 13633
XRT: GCN 13641; Evans et al., 2009, MNRAS, 397, 1177
UVOT: GCN 13641
Other: GCN Report 413.1