Special notes of this burst
Image
Pre-slew 15.0-350.0 keV image (Event data)
 
#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  107.3430     1.0662   0.0105    29.1591    14.2143         2.1897984     18.414 TRIG_00275087                 
 
Foreground time interval of the image:
-47.884  36.101 (delta_t =  83.985 [sec])
Background time interval of the image:
-239.200 -47.884 (delta_t = 191.316 [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 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
 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 4.096000
 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 4.096000
 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  -47.884 sec. to  109.536 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.65699     ( -0.094867   0.0954638 )
Norm@50keV  : 1.84159E-03    ( -9.59557e-05   9.545e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.50 using 59 PHA bins.
# Reduced chi-squared =          1.061 for     57 degrees of freedom 
# Null hypothesis probability =   3.505121e-01
 
Photon flux (15-150 keV)    in 157.4 sec: 0.241023 ( -0.012376  0.0124082 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.69401e-06 ( -1.49382e-07  1.50297e-07 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from  -47.884 sec. to  109.536 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.65820     ( -0.217223   0.0933106 )
Epeak [keV] : 9999.36      ( -9999.35 -9999.36 )
Norm@50keV  : 1.84204E-03    ( -0.000709683   0.000481264 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.52 using 59 PHA bins.
# Reduced chi-squared =          1.081 for     56 degrees of freedom 
# Null hypothesis probability =   3.159088e-01
 
Photon flux (15-150 keV)    in 157.4 sec: 0.241094 ( -0.012281  0.012232 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.69014e-06 ( -1.458e-07  1.50018e-07 ) ergs/cm2
 
Band function
 
Time interval is from  -47.884 sec. to  109.536 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.05324   ( -3.45599   -3.45599 )
beta        : -1.69328    ( -0.116951   0.10732 )
Epeak [keV] : 21.8091      ( -22.2381 99.4248 )
Norm@50keV   : 91.8558    ( -91.8633   8327.68 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.56 using 59 PHA bins.
# Reduced chi-squared =          1.065 for     55 degrees of freedom 
# Null hypothesis probability =   3.460234e-01
 
Photon flux (15-150 keV)    in 157.4 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]    : 12.8983  (  )
R^2/D10^2   : 4.28121E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         194.04 using 59 PHA bins.
# Reduced chi-squared =         3.4042 for     57 degrees of freedom 
# Null hypothesis probability =   7.706614e-17
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.378e-07   2.400e-08
25- 50  8.120e-07   5.084e-08
50-150  8.501e-07   9.790e-08
15-150  1.900e-06   1.196e-07
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 159.781       (-37.7047      -160.334)
Norm        : 0.974924       (-0.0568433     0.0643843)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.90 using 59 PHA bins.
# Reduced chi-squared =          1.174 for     57 degrees of freedom 
# Null hypothesis probability =   1.736847e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.919e-07   3.030e-08
25- 50  7.329e-07   8.862e-08
50-150  1.484e-06   5.153e-07
15-150  2.609e-06   5.635e-07
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.13285        (-0.775807      0.826352)
R1^2/D10^2  : 0.289423        (-0.0944242      0.15206)
kT2 [keV]   : 33.6531        (-6.03966      9.69553)
R2^2/D10^2  : 1.20985E-03    (-0.000636727   0.00109018)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.89 using 59 PHA bins.
# Reduced chi-squared =         0.9435 for     55 degrees of freedom 
# Null hypothesis probability =   5.940645e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.109e-07   5.501e-08
25- 50  7.410e-07   8.303e-08
50-150  1.628e-06   4.452e-07
15-150  2.780e-06   5.816e-07
Peak spectrum fit
Power-law model
 
Time interval is from   70.224 sec. to   71.224 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.48624     ( -0.235944   0.239822 )
Norm@50keV  : 7.45468E-03    ( -0.00105963   0.00104475 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          34.23 using 59 PHA bins.
# Reduced chi-squared =         0.6005 for     57 degrees of freedom 
# Null hypothesis probability =   9.927454e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.927237 ( -0.124221  0.124298 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.08807e-08 ( -1.11308e-08  1.1335e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   70.224 sec. to   71.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.37042     ( -0.986409   1.09918 )
Epeak [keV] : 261.641      ( -261.641 -261.641 )
Norm@50keV  : 8.57975E-03    ( -0.00215981   0.0191261 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          34.18 using 59 PHA bins.
# Reduced chi-squared =         0.6103 for     56 degrees of freedom 
# Null hypothesis probability =   9.905897e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.922944 ( -0.125955  0.127086 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.01667e-08 ( -1.24952e-08  1.19064e-08 ) ergs/cm2
 
Band function
 
Time interval is from   70.224 sec. to   71.224 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.97208   ( -4.97208   -4.97208 )
beta        : -1.52202    ( -0.269993   0.249932 )
Epeak [keV] : 21.1135      ( -21.1135 6.91939 )
Norm@50keV   : 2123.62    ( -282.4   4.18898e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          33.99 using 59 PHA bins.
# Reduced chi-squared =         0.6181 for     55 degrees of freedom 
# Null hypothesis probability =   9.884028e-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]    : 14.1286  (-2.35553  3.00669)
R^2/D10^2   : 0.128708  (-0.0630383   0.115944)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.42 using 59 PHA bins.
# Reduced chi-squared =         0.8494 for     57 degrees of freedom 
# Null hypothesis probability =   7.837224e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.422e-09   1.491e-09
25- 50  2.035e-08   4.460e-09
50-150  2.687e-08   7.935e-09
15-150  5.264e-08   9.895e-09
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (-84.5198      -199.363)
Norm        : 3.78909       (-0.504665     0.504665)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          34.45 using 59 PHA bins.
# Reduced chi-squared =         0.6044 for     57 degrees of freedom 
# Null hypothesis probability =   9.921420e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.435e-09   5.340e-09
25- 50  1.815e-08   1.012e-08
50-150  3.981e-08   2.245e-08
15-150  6.739e-08   3.704e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.42206        (-3.08657      4.16656)
R1^2/D10^2  : 1.27987        (-0.977042      15.5934)
kT2 [keV]   : 25.4928        (-8.923      54.7316)
R2^2/D10^2  : 1.34935E-02    (-0.0126806   0.0431132)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          35.14 using 59 PHA bins.
# Reduced chi-squared =         0.6389 for     55 degrees of freedom 
# Null hypothesis probability =   9.830089e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.192e-09   4.953e-09
25- 50  1.749e-08   8.950e-09
50-150  4.256e-08   2.334e-08
15-150  6.924e-08   3.660e-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: 1.69079     ( -0.140287   0.142591 )
Norm@50keV  : 1.67250E-03    ( -0.000139364   0.000137816 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.97 using 59 PHA bins.
# Reduced chi-squared =          1.052 for     57 degrees of freedom 
# Null hypothesis probability =   3.683986e-01
 
Photon flux (15-150 keV)    in 83.98 sec: 0.221416 ( -0.0171744  0.0172002 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.30143e-06 ( -1.14062e-07  1.1522e-07 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.63492     ( -0.474228   0.687685 )
Epeak [keV] : 306.292      (   )
Norm@50keV  : 1.79175E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.01 using 59 PHA bins.
# Reduced chi-squared =          1.072 for     56 degrees of freedom 
# Null hypothesis probability =   3.324193e-01
 
Photon flux (15-150 keV)    in 83.98 sec: 0.221346 ( -0.008916  0.017175 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.3012e-06 ( -1.2833e-07  1.14398e-07 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 3.41286   ( -3.40702   -3.40702 )
beta        : -1.74212    ( -0.206441   0.169008 )
Epeak [keV] : 22.7427      ( -22.7455 140.172 )
Norm@50keV   : 21.7652    ( -20.8838   153.373 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.18 using 59 PHA bins.
# Reduced chi-squared =          1.076 for     55 degrees of freedom 
# Null hypothesis probability =   3.254543e-01
 
Photon flux (15-150 keV)    in 83.98 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)  = 7.16e-07
S(50-100 keV) = 9.08e-07
 T90 vs. Hardness ratio plot 
 
T90                                   = 115.692000001669 sec.
Hardness ratio (energy fluence ratio) = 1.26816
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 1.20899
Count Ratio (50-100 keV) / (15-25 keV) = 0.788473
 Mask shadow pattern 
 
IMX = 5.408630220464085E-01, IMY = -1.370027779097523E-01
 TIME vs. PHA plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
 TIME vs. DetID plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
 100 us light curve (15-350 keV)
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
 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:
-239.200000 -47.884000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6197  22.0227    0.5  48.0  -27.3   6.2372  21.6    0.9	Crab                          
135.3589 -40.7088  168.6  37.9  110.4   0.0239   0.1   12.0	Vela X-1                      
 31.9279 -70.3018    2.6  57.2 -173.8   3.0351   4.4 ------	UNKNOWN                       
 42.4913 -62.7641    2.8  50.6 -167.0   1.4161   4.1 ------	UNKNOWN                       
 76.5130 -17.3112    2.2  17.8  -82.5   0.7332   5.1 ------	UNKNOWN                       
 22.9246 -57.0908    3.9  58.9 -157.7   3.1546   3.0 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
-47.884000 36.100590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.7713  22.0652    5.2  48.0  -27.1   0.5286   2.2    8.3	Crab                          
135.5926 -40.6688    8.6  38.0  110.3  -0.4049  -1.3    7.4	Vela X-1                      
107.3430   1.0662    0.6  29.2   14.2   2.1898  18.4 ------	UNKNOWN                       
 91.7124  27.2264    2.7  52.2  -16.9   1.1454   4.2 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
85.700600 302.890000
420.800000 532.700590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6240  22.0245    0.3  31.2  -54.4  12.5806  37.3    0.8	Crab                          
135.5903 -40.6706    3.0  49.0  143.3  -4.0911  -3.8    7.5	Vela X-1                      
138.8006 -18.7074    2.5  36.7  115.9   2.5056   4.5 ------	UNKNOWN                       
134.1773  45.7299    2.4  50.5   15.8   2.9487   4.8 ------	UNKNOWN                       
120.7105  35.5872    2.7  36.7   10.0   1.2357   4.2 ------	UNKNOWN                       
109.8524  36.0199    2.9  35.0   -4.8   1.1741   4.0 ------	UNKNOWN                       
101.1822  37.8932    3.2  37.2  -16.4   1.0977   3.6 ------	UNKNOWN                       
 90.3267 -20.2434    2.4  27.1 -151.2   1.0511   4.7 ------	UNKNOWN                       
 85.9870  41.6994    2.4  44.9  -31.0   2.1178   4.8 ------	UNKNOWN                       
 84.2882  56.7673    3.7  58.7  -22.9   4.6193   3.2 ------	UNKNOWN                       
 69.8457  32.0825    3.6  47.0  -53.2   3.6229   3.2 ------	UNKNOWN                       
Plot creation:
Tue Jun 23 22:57:25 EDT 2015