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
  136.6322    35.1514   0.0118    14.6022    99.2895         1.1813287     16.225 TRIG_00305011                 
 
Foreground time interval of the image:
 -0.440  49.861 (delta_t =  50.301 [sec])
Background time interval of the image:
-239.440  -0.440 (delta_t = 239.000 [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 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
 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 8.192000
 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 8.192000
 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   -0.440 sec. to  140.560 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.69897     ( -0.193282   0.198745 )
Norm@50keV  : 7.10105E-04    ( -8.57503e-05   8.39157e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.33 using 59 PHA bins.
# Reduced chi-squared =         0.8654 for     57 degrees of freedom 
# Null hypothesis probability =   7.550703e-01
 
Photon flux (15-150 keV)    in 141 sec: 9.42759E-02 ( -0.00985653  0.00985963 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.27113e-07 ( -1.17082e-07  1.19308e-07 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   -0.440 sec. to  140.560 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.69541     ( -0.525719   0.202006 )
Epeak [keV] : 9999.19      ( -9999.35 -9999.36 )
Norm@50keV  : 7.12365E-04    ( -8.67155e-05   0.000671489 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.33 using 59 PHA bins.
# Reduced chi-squared =         0.8809 for     56 degrees of freedom 
# Null hypothesis probability =   7.235286e-01
 
Photon flux (15-150 keV)    in 141 sec: 9.42960E-02 ( -0.0099031  0.009817 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.25647e-07 ( -1.19182e-07  1.17745e-07 ) ergs/cm2
 
Band function
 
Time interval is from   -0.440 sec. to  140.560 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.65768   ( -4.65768   -4.65768 )
beta        : -1.76797    ( -0.236184   0.216793 )
Epeak [keV] : 21.5670      ( -21.567 5.59653 )
Norm@50keV   : 122.518    ( -12.7438   552927 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.88 using 59 PHA bins.
# Reduced chi-squared =         0.8888 for     55 degrees of freedom 
# Null hypothesis probability =   7.060756e-01
 
Photon flux (15-150 keV)    in 141 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]    : 11.0819  (-1.48683  1.78876)
R^2/D10^2   : 2.97339E-02  (-0.0125607   0.0209624)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          77.59 using 59 PHA bins.
# Reduced chi-squared =          1.361 for     57 degrees of freedom 
# Null hypothesis probability =   3.619873e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.077e-07   1.965e-08
25- 50  3.075e-07   4.082e-08
50-150  2.146e-07   5.732e-08
15-150  6.298e-07   1.000e-07
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 135.501       (-54.0221      -134.06)
Norm        : 0.390830       (-0.0471429     0.0642403)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.27 using 59 PHA bins.
# Reduced chi-squared =         0.8994 for     57 degrees of freedom 
# Null hypothesis probability =   6.890109e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.426e-07   2.236e-08
25- 50  2.603e-07   8.437e-08
50-150  4.919e-07   2.623e-07
15-150  8.948e-07   3.177e-07
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.47401        (-1.95699      1.88618)
R1^2/D10^2  : 0.104971        (-0.0573198      0.131207)
kT2 [keV]   : 45.3403        (-23.4392      -45.9569)
R2^2/D10^2  : 1.96513E-04    (-0.00017591   0.000731042)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.86 using 59 PHA bins.
# Reduced chi-squared =         0.8884 for     55 degrees of freedom 
# Null hypothesis probability =   7.067943e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.482e-07   4.901e-08
25- 50  2.666e-07   7.472e-08
50-150  5.686e-07   2.968e-07
15-150  9.833e-07   3.722e-07
Peak spectrum fit
Power-law model
 
Time interval is from    8.560 sec. to    9.560 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.636107     ( -0.659275   0.536512 )
Norm@50keV  : 3.20303E-03    ( -0.00118135   0.00108534 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.88 using 59 PHA bins.
# Reduced chi-squared =         0.8575 for     57 degrees of freedom 
# Null hypothesis probability =   7.693370e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.372433 ( -0.117295  0.119915 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.02646e-08 ( -1.19697e-08  1.20324e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from    8.560 sec. to    9.560 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.301274     ( -4.10513   -0.301253 )
Epeak [keV] : 341.999      ( -341.987 -341.987 )
Norm@50keV  : 4.25089E-03    ( -0.002137   0.0555803 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.81 using 59 PHA bins.
# Reduced chi-squared =         0.8717 for     56 degrees of freedom 
# Null hypothesis probability =   7.410974e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.367096 ( -0.122961  0.123135 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.00502e-08 ( -1.23097e-08  1.21087e-08 ) ergs/cm2
 
Band function
 
Time interval is from    8.560 sec. to    9.560 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.617193   ( 0.617193   0.617193 )
beta        : -0.636108    ( -0.535786   0.659298 )
Epeak [keV] : 17.4634      ( -17.4634 -17.4634 )
Norm@50keV   : 4.72583E-03    ( -0.00256654   44430.2 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.88 using 59 PHA bins.
# Reduced chi-squared =         0.8887 for     55 degrees of freedom 
# Null hypothesis probability =   7.062399e-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]    : 31.8860  (-10.7836  27.7233)
R^2/D10^2   : 4.87858E-03  (-0.00487858   0.0116081)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.56 using 59 PHA bins.
# Reduced chi-squared =         0.8695 for     57 degrees of freedom 
# Null hypothesis probability =   7.474172e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.468e-10   4.693e-10
25- 50  4.720e-09   2.864e-09
50-150  3.302e-08   1.967e-08
15-150  3.848e-08   2.332e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 1.51198       (-0.503627     0.503584)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.76 using 59 PHA bins.
# Reduced chi-squared =         0.9958 for     57 degrees of freedom 
# Null hypothesis probability =   4.839683e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.768e-09   2.438e-09
25- 50  7.249e-09   4.609e-09
50-150  1.590e-08   1.016e-08
15-150  2.691e-08   1.660e-08
Double BB
 
R1^2/D10^2  : 1.00090E+06        (      )
kT2 [keV]   : 33.2580        (-11.677      30.3652)
R2^2/D10^2  : 4.29222E-03    (   )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.48 using 59 PHA bins.
#Fit statistic : Chi-Squared =          47.09 using 59 PHA bins.
#Fit statistic : Chi-Squared =          47.05 using 59 PHA bins.
# Reduced chi-squared =         0.8814 for     55 degrees of freedom 
# Reduced chi-squared =         0.8562 for     55 degrees of freedom 
# Reduced chi-squared =         0.8555 for     55 degrees of freedom 
# Null hypothesis probability =   7.204003e-01
# Null hypothesis probability =   7.671402e-01
# Null hypothesis probability =   7.682627e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.914e-09   1.501e-09
25- 50  5.611e-09   2.936e-09
50-150  3.324e-08   1.840e-08
15-150  4.077e-08   2.285e-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: 1.28836     ( -0.167663   0.166003 )
Norm@50keV  : 1.47690E-03    ( -0.000143516   0.000143294 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.35 using 59 PHA bins.
# Reduced chi-squared =         0.8833 for     57 degrees of freedom 
# Null hypothesis probability =   7.209702e-01
 
Photon flux (15-150 keV)    in 50.3 sec: 0.175825 ( -0.0173719  0.0173962 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.36206e-07 ( -7.97713e-08  8.0487e-08 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.841049     ( -0.806329   0.5468 )
Epeak [keV] : 131.289      (   )
Norm@50keV  : 2.47553E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.13 using 59 PHA bins.
# Reduced chi-squared =         0.8774 for     56 degrees of freedom 
# Null hypothesis probability =   7.302538e-01
 
Photon flux (15-150 keV)    in 50.3 sec: 0.172584 ( -0.018194  0.01811 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.10186e-07 ( -9.11889e-08  9.03086e-08 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 1.68916   ( -1.14788   -1.14788 )
beta        : -1.43244    ( 1.42982   0.234677 )
Epeak [keV] : 36.5147      ( -36.4122 61.5799 )
Norm@50keV   : 0.157184    ( -0.163176   19.5596 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.22 using 59 PHA bins.
# Reduced chi-squared =         0.8768 for     55 degrees of freedom 
# Null hypothesis probability =   7.292512e-01
 
Photon flux (15-150 keV)    in 50.3 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)  = 2.51e-07
S(50-100 keV) = 3.09e-07
 T90 vs. Hardness ratio plot 
 
T90                                   = 124 sec.
Hardness ratio (energy fluence ratio) = 1.23108
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 1.06115
Count Ratio (50-100 keV) / (15-25 keV) = 0.648602
 Mask shadow pattern 
 
IMX = -4.205418108156107E-02, IMY = -2.571044896457641E-01
 TIME vs. PHA plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
 TIME vs. DetID plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
 100 us light curve (15-350 keV)
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
 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:
-239.440000 -0.440000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6280  22.0183    0.3  40.4 -147.3  10.4684  38.7    0.4	Crab                          
251.7999  68.4053    2.5  59.2  -14.9   4.9023   4.6 ------	UNKNOWN                       
354.5855  80.1076    3.2  50.6  -44.5   3.7166   3.6 ------	UNKNOWN                       
 45.2588  69.9081    2.4  43.6  -63.8   3.9336   4.8 ------	UNKNOWN                       
 54.2714  61.0232    2.4  41.6  -77.7   3.3838   4.9 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
-0.440000 49.860600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6220  22.0145    3.1  40.4 -147.3  -0.3851  -3.7    0.6	Crab                          
136.6322  35.1513    0.7  14.6   99.3   1.1812  16.2 ------	UNKNOWN                       
132.3332  49.0574    2.4   6.5   24.9   0.3181   4.9 ------	UNKNOWN                       
 98.3740   8.3942    3.0  43.5 -176.5   0.4449   3.9 ------	UNKNOWN                       
 89.5491  53.1424    2.2  23.0  -94.2   0.4310   5.2 ------	UNKNOWN                       
327.2766  80.9620    2.0  52.3  -39.1   1.8007   5.7 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
86.060600 962.593100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6295  22.0131    1.1  47.8 -129.5  19.5727  10.5    0.2	Crab                          
143.7080   3.0851    3.5  32.8  128.5   2.4500   3.3 ------	UNKNOWN                       
166.3879  29.5007    2.5  25.7   56.0   2.5993   4.7 ------	UNKNOWN                       
162.9601  47.6551    3.0  23.2   11.0   1.6423   3.9 ------	UNKNOWN                       
 91.3281  -6.1606    3.0  59.4 -163.1  14.9524   3.8 ------	UNKNOWN                       
 97.9275  42.5855    2.1  30.7 -102.6   3.1134   5.4 ------	UNKNOWN                       
 91.3912  61.3984    3.2  38.6  -71.4   3.6111   3.6 ------	UNKNOWN                       
Plot creation:
Sun May 31 08:12:11 EDT 2015