Click here for the BAT GCN circular template
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
89.1597 -57.9672 0.0042 35.7833 -27.5476 2.5879829 45.093 TRIG_00633180
Foreground time interval of the image:
-0.920 10.221 (delta_t = 11.141 [sec])
Background time interval of the image:
-530.779 -513.503 (delta_t = 17.277 [sec])
-239.280 -0.920 (delta_t = 238.360 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
8 ms binning
From T100_start-3 s to T100_start+3 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
2 ms binning
From T100_start-1 s to T100_start+1 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Quad-rate summed light curves (from T0-300s to T0+1000s)
Spectral Evolution
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.920 sec. to 24.056 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45567 ( -0.0742473 0.0741257 )
Norm@50keV : 8.28846E-03 ( -0.000337222 0.000337147 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.65 using 59 PHA bins.
# Reduced chi-squared = 1.345 for 57 degrees of freedom
# Null hypothesis probability = 4.231770e-02
Photon flux (15-150 keV) in 24.98 sec: 1.02288 ( -0.0447324 0.0448426 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97922e-06 ( -8.60776e-08 8.62667e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.920 sec. to 24.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39637 ( -0.287745 0.0954545 )
Epeak [keV] : 544.629 ( -544.648 -544.648 )
Norm@50keV : 8.84580E-03 ( -0.0015107 0.00317694 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.52 using 59 PHA bins.
# Reduced chi-squared = 1.366 for 56 degrees of freedom
# Null hypothesis probability = 3.563116e-02
Photon flux (15-150 keV) in 24.98 sec: 1.01935 ( -0.047317 0.04726 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97268e-06 ( -9.17465e-08 9.1137e-08 ) ergs/cm2
Band function
Time interval is from -0.920 sec. to 24.056 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97207 ( -4.97207 -4.97207 )
beta : -1.48308 ( -0.0791582 0.0783477 )
Epeak [keV] : 22.7305 ( -22.7305 3.60165 )
Norm@50keV : 1415.89 ( -57.4817 3.3859e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.87 using 59 PHA bins.
# Reduced chi-squared = 1.361 for 55 degrees of freedom
# Null hypothesis probability = 3.860619e-02
Photon flux (15-150 keV) in 24.98 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.4309 ( )
R^2/D10^2 : 8.30945E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 225.00 using 59 PHA bins.
# Reduced chi-squared = 3.9474 for 57 degrees of freedom
# Null hypothesis probability = 8.129619e-22
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.151e-07 9.667e-09
25- 50 4.955e-07 2.823e-08
50-150 9.443e-07 7.282e-08
15-150 1.555e-06 7.656e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 4.23008 (-0.1723 0.17228)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.16 using 59 PHA bins.
# Reduced chi-squared = 1.494 for 57 degrees of freedom
# Null hypothesis probability = 9.210312e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.631e-07 1.149e-08
25- 50 5.062e-07 2.448e-08
50-150 1.110e-06 5.133e-08
15-150 1.879e-06 8.281e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.47990 (-1.07564 1.13003)
R1^2/D10^2 : 0.577662 (-0.188422 0.319975)
kT2 [keV] : 35.4080 (-6.18843 10.6118)
R2^2/D10^2 : 4.79313E-03 (-0.00262212 0.0043448)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.23 using 59 PHA bins.
# Reduced chi-squared = 1.404 for 55 degrees of freedom
# Null hypothesis probability = 2.565649e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.164e-07 2.823e-08
25- 50 5.156e-07 5.396e-08
50-150 1.248e-06 2.760e-07
15-150 1.980e-06 2.714e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 0.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38442 ( -0.131781 0.132158 )
Norm@50keV : 2.48029E-02 ( -0.00194227 0.00193837 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.28 using 59 PHA bins.
# Reduced chi-squared = 0.9873 for 57 degrees of freedom
# Null hypothesis probability = 5.022120e-01
Photon flux (15-150 keV) in 1 sec: 3.01002 ( -0.241068 0.241365 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.40437e-07 ( -2.06189e-08 2.07075e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07718 ( -0.549021 0.372441 )
Epeak [keV] : 160.891 ( -71.5196 -160.891 )
Norm@50keV : 3.48813E-02 ( -0.0114417 0.0278691 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.17 using 59 PHA bins.
# Reduced chi-squared = 0.9851 for 56 degrees of freedom
# Null hypothesis probability = 5.063945e-01
Photon flux (15-150 keV) in 1 sec: 2.97652 ( -0.24734 0.24713 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3712e-07 ( -2.16e-08 2.1528e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07835 ( -0.304908 0.553175 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 160.892 ( -51.5797 -160.954 )
Norm@50keV : 3.48659E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.17 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 55 degrees of freedom
# Null hypothesis probability = 4.683299e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.3577 (-1.68175 1.89181)
R^2/D10^2 : 0.214878 (-0.064276 0.0900222)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.48 using 59 PHA bins.
# Reduced chi-squared = 1.605 for 57 degrees of freedom
# Null hypothesis probability = 2.543580e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.311e-08 2.090e-09
25- 50 5.896e-08 6.610e-09
50-150 1.276e-07 1.775e-08
15-150 1.997e-07 1.925e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 12.4906 (-0.974517 0.974452)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.37 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 57 degrees of freedom
# Null hypothesis probability = 3.550687e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.110e-08 2.905e-09
25- 50 5.983e-08 6.205e-09
50-150 1.312e-07 4.223e-08
15-150 2.221e-07 4.460e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.99295 (-1.56765 2.16843)
R1^2/D10^2 : 4.63122 (-3.0222 10.6749)
kT2 [keV] : 24.8980 (-3.93635 6.65831)
R2^2/D10^2 : 5.36978E-02 (-0.0308393 0.0468325)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.68 using 59 PHA bins.
# Reduced chi-squared = 0.9941 for 55 degrees of freedom
# Null hypothesis probability = 4.869579e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.786e-08 1.293e-08
25- 50 5.476e-08 1.692e-08
50-150 1.529e-07 4.191e-08
15-150 2.355e-07 4.845e-08
Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)
Power-law model
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42477 ( -0.0646128 0.0645198 )
Norm@50keV : 1.58805E-02 ( -0.000568645 0.000568639 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.97 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 57 degrees of freedom
# Null hypothesis probability = 3.687072e-01
Photon flux (15-150 keV) in 11.14 sec: 1.94510 ( -0.0753168 0.0755011 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70099e-06 ( -6.47316e-08 6.48379e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20336 ( -0.261579 0.239917 )
Epeak [keV] : 197.160 ( -77.868 -197.16 )
Norm@50keV : 2.01271E-02 ( -0.00435435 0.00629057 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.63 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 56 degrees of freedom
# Null hypothesis probability = 4.145398e-01
Photon flux (15-150 keV) in 11.14 sec: 1.92019 ( -0.07985 0.08003 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.68066e-06 ( -6.94356e-08 6.91348e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.803332 ( -0.499153 0.852354 )
beta : -1.52845 ( 1.52808 0.116745 )
Epeak [keV] : 79.2731 ( -49.6895 654.494 )
Norm@50keV : 3.51669E-02 ( -0.0181893 0.617164 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.41 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 55 degrees of freedom
# Null hypothesis probability = 4.221484e-01
Photon flux (15-150 keV) in 11.14 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 4.79e-07
S(50-100 keV) = 6.98e-07
T90 vs. Hardness ratio plot
T90 = 17.1360000371933 sec.
Hardness ratio (energy fluence ratio) = 1.4572
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.45318
Count Ratio (50-100 keV) / (15-25 keV) = 1.14832
Mask shadow pattern
IMX = 6.390636812100443E-01, IMY = 3.333504845329644E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image:
-530.779400 -513.502600
-239.280000 -0.920000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5142 -40.5747 1.3 24.3 40.5 2.1292 8.8 1.4 Vela X-1
170.2385 -60.4780 20.4 5.0 -153.8 0.1164 0.6 9.0 Cen X-3
186.6201 -62.8633 4.4 13.0 -148.2 0.5705 2.7 5.7 GX 301-2
224.9295 -23.7382 2.7 56.5 173.6 5.5570 4.3 ------ UNKNOWN
217.6760 -38.5993 3.6 40.9 179.1 1.0871 3.2 ------ UNKNOWN
164.3486 -79.5865 2.5 20.8 -88.8 1.1518 4.6 ------ UNKNOWN
249.3446 -37.8229 3.5 57.6 -156.3 5.0751 3.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.920000 10.220590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.7759 -40.4549 0.0 24.3 41.0 0.0809 1.6 12.8 Vela X-1
169.9594 -60.5046 0.0 4.9 -153.0 -0.0175 -0.4 12.7 Cen X-3
186.8561 -62.7610 7.2 13.1 -148.7 -0.0716 -1.6 5.5 GX 301-2
89.1597 -57.9672 0.3 35.8 -27.5 2.5879 45.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
66.220590 183.135300
184.720000 542.920600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5370 -40.5572 1.6 34.0 98.1 4.5424 7.2 0.4 Vela X-1
170.0276 -60.6324 3.2 38.7 147.7 2.2715 3.6 8.5 Cen X-3
186.5843 -62.7772 3.0 43.7 157.4 3.1155 3.9 2.0 GX 301-2
83.0523 -66.3573 2.0 8.9 -145.5 1.7490 5.8 ------ UNKNOWN
241.2521 -74.6874 2.3 46.1 -171.5 2.8238 5.0 ------ UNKNOWN
33.1940 -34.5831 4.1 43.5 -64.2 5.7130 2.9 ------ UNKNOWN
33.1684 -34.2574 3.8 43.8 -63.9 6.6690 3.3 ------ UNKNOWN
335.4881 -64.0763 3.5 48.0 -129.0 5.8198 3.3 ------ UNKNOWN
20.4536 -47.7862 3.3 40.8 -88.2 6.2290 3.5 ------ UNKNOWN
Plot creation:
Fri Apr 17 12:10:37 EDT 2015