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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
228.2172 -14.6987 0.0112 39.7182 -63.8193 2.7433711 17.077 TRIG_00304379
Foreground time interval of the image:
-15.144 15.957 (delta_t = 31.101 [sec])
Background time interval of the image:
-653.843 -647.045 (delta_t = 6.799 [sec])
-239.144 -15.144 (delta_t = 224.000 [sec])
Lightcurves
Notes:
- 1) The mask-weighted light curves are using the flight position.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
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) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -15.144 sec. to 80.856 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81314 ( -0.0512392 0.0514679 )
Norm@50keV : 1.02998E-02 ( -0.000266947 0.000266464 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.82 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 57 degrees of freedom
# Null hypothesis probability = 4.447247e-01
Photon flux (15-150 keV) in 96 sec: 1.42659 ( -0.0418399 0.0420444 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.09892e-06 ( -2.38578e-07 2.38984e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.144 sec. to 80.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81219 ( -0.145498 0.0615989 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 1.03117E-02 ( -0.000267708 0.000261362 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.83 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 56 degrees of freedom
# Null hypothesis probability = 4.075212e-01
Photon flux (15-150 keV) in 96 sec: 1.42718 ( -0.04337 0.04059 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.09859e-06 ( -2.33482e-07 2.32934e-07 ) ergs/cm2
Band function
Time interval is from -15.144 sec. to 80.856 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.897199 ( 1.08494 6.08303 )
beta : -1.84154 ( -2.22786 0.0636779 )
Epeak [keV] : 35.4228 ( -35.3754 579.264 )
Norm@50keV : 4.27052E-02 ( -0.043443 1610.23 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.05 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 55 degrees of freedom
# Null hypothesis probability = 4.352891e-01
Photon flux (15-150 keV) in 96 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] : 13.5808 ( )
R^2/D10^2 : 0.199960 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 451.14 using 59 PHA bins.
# Reduced chi-squared = 7.9147 for 57 degrees of freedom
# Null hypothesis probability = 1.121489e-62
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.497e-07 4.291e-08
25- 50 2.704e-06 9.360e-08
50-150 3.231e-06 1.694e-07
15-150 6.685e-06 1.896e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 111.117 (-11.0157 23.1228)
Norm : 6.06566 (-0.310033 0.209245)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.67 using 59 PHA bins.
# Reduced chi-squared = 1.398 for 57 degrees of freedom
# Null hypothesis probability = 2.535275e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.520e-06 9.168e-08
25- 50 2.683e-06 1.061e-07
50-150 4.605e-06 1.034e-06
15-150 8.808e-06 1.060e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.51817 (-0.597518 0.62157)
R1^2/D10^2 : 1.36949 (-0.332254 0.477323)
kT2 [keV] : 29.8575 (-3.51007 4.77891)
R2^2/D10^2 : 8.49437E-03 (-0.00333993 0.00480198)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.04 using 59 PHA bins.
# Reduced chi-squared = 1.273 for 55 degrees of freedom
# Null hypothesis probability = 8.334801e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.392e-06 1.056e-07
25- 50 2.705e-06 1.354e-07
50-150 4.857e-06 4.243e-07
15-150 8.954e-06 5.194e-07
Peak spectrum fit
Power-law model
Time interval is from 40.356 sec. to 41.356 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76670 ( -0.0869094 0.0879893 )
Norm@50keV : 5.53066E-02 ( -0.0027927 0.00277806 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.23 using 59 PHA bins.
# Reduced chi-squared = 0.8111 for 57 degrees of freedom
# Null hypothesis probability = 8.452983e-01
Photon flux (15-150 keV) in 1 sec: 7.52496 ( -0.373634 0.374371 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.09879e-07 ( -2.64656e-08 2.65763e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 40.356 sec. to 41.356 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54347 ( -0.354383 0.266735 )
Epeak [keV] : 99.7211 ( -34.9555 -99.7223 )
Norm@50keV : 7.20327E-02 ( -0.0186493 0.0366522 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.90 using 59 PHA bins.
# Reduced chi-squared = 0.8018 for 56 degrees of freedom
# Null hypothesis probability = 8.561720e-01
Photon flux (15-150 keV) in 1 sec: 7.43151 ( -0.39659 0.39693 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.01225e-07 ( -2.9736e-08 2.9545e-08 ) ergs/cm2
Band function
Time interval is from 40.356 sec. to 41.356 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13257 ( 1.12504 5.62107 )
beta : -1.89928 ( 1.8992 0.170849 )
Epeak [keV] : 52.6216 ( -52.0907 204.955 )
Norm@50keV : 0.130338 ( -0.0788801 6589.71 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.69 using 59 PHA bins.
# Reduced chi-squared = 0.7944 for 55 degrees of freedom
# Null hypothesis probability = 8.637816e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.99491e-07 ( -4.99484e-07 -2.8759e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.6035 ( )
R^2/D10^2 : 1.47014 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 149.97 using 59 PHA bins.
# Reduced chi-squared = 2.6311 for 57 degrees of freedom
# Null hypothesis probability = 2.697041e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.952e-08 4.580e-09
25- 50 1.649e-07 9.600e-09
50-150 1.625e-07 1.750e-08
15-150 3.769e-07 2.240e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 111.145 (-18.3463 35.1932)
Norm : 32.5977 (-2.37068 2.10192)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.55 using 59 PHA bins.
# Reduced chi-squared = 0.8167 for 57 degrees of freedom
# Null hypothesis probability = 8.369708e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.511e-08 7.185e-09
25- 50 1.502e-07 9.150e-09
50-150 2.578e-07 7.080e-08
15-150 4.931e-07 7.570e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.23827 (-1.07589 1.11757)
R1^2/D10^2 : 8.12786 (-3.0573 6.00712)
kT2 [keV] : 26.6494 (-4.78528 7.89972)
R2^2/D10^2 : 6.86931E-02 (-0.0411011 0.0777321)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.33 using 59 PHA bins.
# Reduced chi-squared = 0.8787 for 55 degrees of freedom
# Null hypothesis probability = 7.254948e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.892e-08 1.187e-08
25- 50 1.512e-07 2.030e-08
50-150 2.686e-07 6.955e-08
15-150 4.987e-07 8.505e-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: 1.36673 ( -0.153222 0.151865 )
Norm@50keV : 5.67611E-03 ( -0.000477794 0.000477639 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.90 using 59 PHA bins.
# Reduced chi-squared = 1.454 for 57 degrees of freedom
# Null hypothesis probability = 1.415180e-02
Photon flux (15-150 keV) in 31.1 sec: 0.686206 ( -0.0609267 0.0611487 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.71774e-06 ( -1.57089e-07 1.57809e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36787 ( -0.158372 0.148808 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 5.68751E-03 ( -0.00569683 0.0028825 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.92 using 59 PHA bins.
# Reduced chi-squared = 1.481 for 56 degrees of freedom
# Null hypothesis probability = 1.121713e-02
Photon flux (15-150 keV) in 31.1 sec: 0.687163 ( -0.061902 0.060001 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.71547e-06 ( -1.5485e-07 1.57394e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.725722 ( 0.911868 0.911868 )
beta : -1.38969 ( -0.791137 0.172564 )
Epeak [keV] : 56.5947 ( -58.3948 287.195 )
Norm@50keV : 1.57759E-02 ( -0.0159945 488251 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.70 using 59 PHA bins.
# Reduced chi-squared = 1.504 for 55 degrees of freedom
# Null hypothesis probability = 9.232422e-03
Photon flux (15-150 keV) in 31.1 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) = 2.57e-06
S(50-100 keV) = 2.93e-06
T90 vs. Hardness ratio plot
T90 = 64 sec.
Hardness ratio (energy fluence ratio) = 1.14008
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.18864
Count Ratio (50-100 keV) / (15-25 keV) = 0.738203
Mask shadow pattern
IMX = 3.665309447926398E-01, IMY = 7.455223896173090E-01
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
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:
-653.843400 -647.044600
-239.144000 -15.144000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
160.8254 -44.0397 3.1 51.0 30.9 3.3984 3.7 ------ UNKNOWN
170.0664 -51.3615 2.9 53.8 19.2 4.0891 4.0 ------ UNKNOWN
219.2895 -47.2069 2.6 52.9 -20.6 2.2763 4.5 ------ UNKNOWN
229.7491 29.6102 2.3 47.9 -128.9 4.0048 5.0 ------ UNKNOWN
232.4614 -18.7473 3.3 44.9 -60.0 3.0172 3.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-15.144000 15.956590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
177.6951 -7.9584 1.9 14.9 63.1 0.3686 6.1 ------ UNKNOWN
228.2172 -14.6987 0.7 39.7 -63.8 2.7430 17.1 ------ UNKNOWN
229.0669 34.6631 2.1 50.2 -134.9 1.7668 5.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
79.356600 962.928800
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.6804 -62.7505 2.1 56.1 7.4 26.4813 5.5 1.4 GX 301-2
244.9745 -15.6434 0.1 16.2 -98.6 52.2777 80.7 0.3 Sco X-1
254.5614 35.3175 5.6 55.9 -168.1 4.7727 2.1 5.3 Her X-1
256.1479 -37.7556 6.7 33.8 -55.8 1.6583 1.7 9.3 4U 1700-377
256.6326 -36.2809 0.0 33.3 -58.4 -1.3649 -1.4 12.8 GX 349+2
263.1368 -24.8704 8.4 34.3 -81.3 -1.5541 -1.4 10.2 GX 1+4
264.8838 -44.2952 9.5 42.9 -53.0 -2.0288 -1.2 11.1 4U 1735-44
268.4212 -1.4312 4.7 41.9 -118.8 4.3402 2.4 3.4 SW J1753.5-0127
270.2665 -25.1947 7.5 40.7 -82.4 -4.2447 -1.5 7.0 GX 5-1
270.4234 -25.8502 9.9 41.0 -81.4 3.2288 1.2 9.2 GRS 1758-258
262.8217 -33.7226 0.0 36.6 -66.5 -2.8053 -2.1 10.7 GX 354-0
190.1451 -44.7285 2.8 44.0 25.1 6.4196 4.1 ------ UNKNOWN
229.8389 26.4375 3.8 41.2 168.2 3.5764 3.0 ------ UNKNOWN
188.5825 -64.7526 3.6 56.8 4.9 12.1328 3.2 ------ UNKNOWN
224.2170 -11.2618 3.2 5.2 117.2 1.9788 3.6 ------ UNKNOWN
209.4263 -62.2583 2.8 49.4 -2.7 6.1179 4.1 ------ UNKNOWN
215.6658 -56.7154 3.6 43.1 -4.0 3.3271 3.2 ------ UNKNOWN
261.6409 -59.2839 2.9 50.9 -35.3 7.6382 4.0 ------ UNKNOWN
Plot creation:
Sun May 31 08:15:58 EDT 2015