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
  283.4361   -54.2823   0.0121    24.1920   141.3940         0.1966767     15.800 TRIG_00555880                 
 
Foreground time interval of the image:
 -0.036   0.332 (delta_t =   0.368 [sec])
Background time interval of the image:
-147.895  -0.036 (delta_t = 147.859 [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 0.064000
 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 0.064000
 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 0.064000
 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   -0.036 sec. to    0.332 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.769505     ( -0.186431   0.180604 )
Norm@50keV  : 3.45164E-02    ( -0.00366744   0.00363866 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.98 using 59 PHA bins.
# Reduced chi-squared =          1.070 for     57 degrees of freedom 
# Null hypothesis probability =   3.347632e-01
 
Photon flux (15-150 keV)    in 0.368 sec: 3.97214 ( -0.411815  0.412224 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.50369e-07 ( -1.7025e-08  1.71261e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   -0.036 sec. to    0.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.330394     ( -0.903696   0.561598 )
Epeak [keV] : 233.671      ( -233.591 -233.591 )
Norm@50keV  : 5.24673E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.00 using 59 PHA bins.
# Reduced chi-squared =          1.071 for     56 degrees of freedom 
# Null hypothesis probability =   3.329590e-01
 
Photon flux (15-150 keV)    in 0.368 sec: 3.91073 ( -0.42795  0.42584 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.48332e-07 ( -1.78292e-08  1.76953e-08 ) ergs/cm2
 
Band function
 
Time interval is from   -0.036 sec. to    0.332 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.00918   ( 1.00897   1.00897 )
beta        : -0.769506    ( -0.180552   0.186731 )
Epeak [keV] : 16.6116      ( -16.6157 -16.6157 )
Norm@50keV   : 4.62665E-02    ( -0.0153323   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.98 using 59 PHA bins.
# Reduced chi-squared =          1.109 for     55 degrees of freedom 
# Null hypothesis probability =   2.695988e-01
 
Photon flux (15-150 keV)    in 0.368 sec: 3.93659 (    ) 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]    : 26.2797  (-3.45838  4.34702)
R^2/D10^2   : 8.88661E-02  (-0.0317177   0.0458792)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.08 using 59 PHA bins.
# Reduced chi-squared =          1.177 for     57 degrees of freedom 
# Null hypothesis probability =   1.697780e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.819e-09   7.579e-10
25- 50  2.221e-08   4.002e-09
50-150  1.127e-07   1.967e-08
15-150  1.387e-07   2.123e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 14.8602       (-1.67197     1.67193)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         107.61 using 59 PHA bins.
# Reduced chi-squared =         1.8879 for     57 degrees of freedom 
# Null hypothesis probability =   5.856546e-05
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.362e-08   7.625e-09
25- 50  2.620e-08   1.445e-08
50-150  5.746e-08   3.148e-08
15-150  9.727e-08   5.376e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 3.92992        (-1.76676      3.78909)
R1^2/D10^2  : 18.3893        (-17.2309      525.959)
kT2 [keV]   : 29.7090        (-4.59053      7.00624)
R2^2/D10^2  : 5.97975E-02    (-0.0277578   0.0415501)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.70 using 59 PHA bins.
# Reduced chi-squared =          1.031 for     55 degrees of freedom 
# Null hypothesis probability =   4.112678e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.703e-09   4.201e-09
25- 50  2.072e-08   4.869e-09
50-150  1.176e-07   2.565e-08
15-150  1.470e-07   2.828e-08
Peak spectrum fit
Power-law model
 
Time interval is from   -0.350 sec. to    0.650 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.890949     ( -0.241533   0.232596 )
Norm@50keV  : 1.24751E-02    ( -0.00173902   0.0017273 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.37 using 59 PHA bins.
# Reduced chi-squared =          1.024 for     57 degrees of freedom 
# Null hypothesis probability =   4.247819e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.43180 ( -0.198831  0.19933 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.40504e-07 ( -2.07297e-08  2.0881e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   -0.350 sec. to    0.650 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.187105     ( -1.62994   1.08327 )
Epeak [keV] : 122.529      ( -38.9219 -122.412 )
Norm@50keV  : 3.50532E-02    ( -0.0351439   0.109365 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.73 using 59 PHA bins.
# Reduced chi-squared =         0.9952 for     56 degrees of freedom 
# Null hypothesis probability =   4.850949e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.36704 ( -0.21567  0.21237 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.34737e-07 ( -2.2379e-08  2.2243e-08 ) ergs/cm2
 
Band function
 
Time interval is from   -0.350 sec. to    0.650 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.875008   ( 0.875088   0.875088 )
beta        : -0.906585    ( -0.23262   0.241314 )
Epeak [keV] : 10000.00      ( -10000 -10000 )
Norm@50keV   : 1.25435E-02    ( -0.00173621   0.00169606 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.34 using 59 PHA bins.
# Reduced chi-squared =          1.061 for     55 degrees of freedom 
# Null hypothesis probability =   3.537715e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.37886 (    ) 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]    : 23.5775  (-3.54994  4.62488)
R^2/D10^2   : 4.36107E-02  (-0.0183593   0.028752)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.05 using 59 PHA bins.
# Reduced chi-squared =          1.001 for     57 degrees of freedom 
# Null hypothesis probability =   4.733785e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.340e-09   1.225e-09
25- 50  2.387e-08   5.670e-09
50-150  9.901e-08   2.321e-08
15-150  1.272e-07   2.453e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 5.65417       (-0.822749     0.822731)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          78.47 using 59 PHA bins.
# Reduced chi-squared =          1.377 for     57 degrees of freedom 
# Null hypothesis probability =   3.121313e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.407e-08   7.975e-09
25- 50  2.707e-08   1.551e-08
50-150  5.938e-08   3.332e-08
15-150  1.005e-07   5.620e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 3.15037        (-2.41238      6.14191)
R1^2/D10^2  : 18.6426        (-18.5077      393.168)
kT2 [keV]   : 25.2842        (-4.22367      5.14281)
R2^2/D10^2  : 3.42302E-02    (-0.0174678   0.0183116)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.13 using 59 PHA bins.
# Reduced chi-squared =         0.9660 for     55 degrees of freedom 
# Null hypothesis probability =   5.464368e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.471e-09   3.571e-09
25- 50  2.237e-08   7.175e-09
50-150  1.020e-07   3.117e-08
15-150  1.329e-07   3.375e-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: 0.769505     ( -0.186431   0.180604 )
Norm@50keV  : 3.45164E-02    ( -0.00366744   0.00363866 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.98 using 59 PHA bins.
# Reduced chi-squared =          1.070 for     57 degrees of freedom 
# Null hypothesis probability =   3.347632e-01
 
Photon flux (15-150 keV)    in 0.368 sec: 3.97214 ( -0.411815  0.412224 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.50369e-07 ( -1.7025e-08  1.71261e-08 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.330394     ( -0.903696   0.561598 )
Epeak [keV] : 233.671      ( -233.591 -233.591 )
Norm@50keV  : 5.24673E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.00 using 59 PHA bins.
# Reduced chi-squared =          1.071 for     56 degrees of freedom 
# Null hypothesis probability =   3.329590e-01
 
Photon flux (15-150 keV)    in 0.368 sec: 3.91073 ( -0.42795  0.42584 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.48332e-07 ( -1.78292e-08  1.76953e-08 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.00918   ( 1.00897   1.00897 )
beta        : -0.769506    ( -0.180552   0.186731 )
Epeak [keV] : 16.6116      ( -16.6157 -16.6157 )
Norm@50keV   : 4.62665E-02    ( -0.0153323   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.98 using 59 PHA bins.
# Reduced chi-squared =          1.109 for     55 degrees of freedom 
# Null hypothesis probability =   2.695988e-01
 
Photon flux (15-150 keV)    in 0.368 sec: 3.93659 (    ) 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)  = 2.37e-08
S(50-100 keV) = 5.57e-08
 T90 vs. Hardness ratio plot 
 
T90                                   = 0.295999944210052 sec.
Hardness ratio (energy fluence ratio) = 2.35021
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 1.80089
Count Ratio (50-100 keV) / (15-25 keV) = 2.78941
 Mask shadow pattern 
 
IMX = -3.510695361386565E-01, IMY = -2.803151470316865E-01
 TIME vs. PHA plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
 TIME vs. DetID plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
 100 us light curve (15-350 keV)
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
 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:
-147.895410 -0.036000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.2245 -60.6206    4.2  35.5   13.0   0.5910   2.8    2.7	Cen X-3                       
187.1008 -62.7699  105.7  30.7   25.3   0.0223   0.1   12.2	GX 301-2                      
264.7253 -44.2902   74.2  35.0  117.9   0.0568   0.2    9.6	4U 1735-44                    
232.6834 -44.7627    2.4  38.9   80.2   2.8965   4.8 ------	UNKNOWN                       
166.2416 -66.7983    2.3  30.3    6.2   0.8911   5.0 ------	UNKNOWN                       
315.5066 -58.7336    2.6  22.2 -171.9   0.6599   4.4 ------	UNKNOWN                       
338.8428 -72.5978    2.1  14.2 -122.5   0.7934   5.4 ------	UNKNOWN                       
337.3728 -24.7549    3.5  58.7 -159.2   3.5815   3.3 ------	UNKNOWN                       
119.6331 -42.0796    2.3  59.1  -24.2   5.8691   4.9 ------	UNKNOWN                       
 98.4815 -49.3963    3.0  52.1  -42.2   3.5108   3.8 ------	UNKNOWN                       
357.3110 -36.4895    2.5  51.0 -135.6   4.0220   4.6 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
-0.036000 0.332000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.0834 -60.6190    5.7  35.5   12.9  -0.0285  -2.0    6.8	Cen X-3                       
186.8417 -62.6680    3.8  30.8   25.2   0.0415   3.0    8.0	GX 301-2                      
264.9090 -44.4620    6.3  34.8  118.1  -0.0433  -1.8    7.1	4U 1735-44                    
238.0437 -43.7620    1.8  39.0   86.5   0.2745   6.3 ------	UNKNOWN                       
283.4361 -54.2823    0.7  24.2  141.4   0.1967  15.8 ------	UNKNOWN                       
237.6035 -79.4410    2.7   8.7   23.8   0.0395   4.2 ------	UNKNOWN                       
  8.3272 -70.8473    2.5  21.2 -102.0   0.0521   4.7 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
58.904590 836.504620
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.5294 -60.6066    6.4  53.4   13.0   4.7473   1.8    6.4	Cen X-3                       
186.6576 -62.8815    4.9  46.3   17.6   3.4227   2.3    6.7	GX 301-2                      
255.9598 -37.8425    0.8  24.9   98.8  13.5304  14.3    1.3	4U 1700-377                   
256.4871 -36.6004    4.4  25.6  101.4  -2.7227  -2.6   10.9	GX 349+2                      
263.0018 -24.7288   81.3  33.2  123.4   0.1856   0.1    1.1	GX 1+4                        
264.8364 -44.4072    6.7  15.6  100.6   1.1786   1.7    4.8	4U 1735-44                    
270.3372 -25.2573    0.0  30.6  135.0   2.2305   2.2   11.1	GX 5-1                        
270.4024 -25.7804    5.3  30.1  134.9   2.2066   2.2    5.8	GRS 1758-258                  
273.8748 -14.0202    3.9  41.0  144.5   5.8329   3.0    7.7	GX 17+2                       
275.9858 -30.4683    2.7  24.4  143.1   3.2102   4.2    6.8	H1820-303                     
284.9477 -24.7683    5.6  29.6  161.6   1.7677   2.0   10.3	HT1900.1-2455                 
262.9936 -33.8316   53.8  25.0  115.4   0.1885   0.2    0.3	GX 354-0                      
250.3512 -53.9766    4.0  19.2   56.2   1.9760   2.9 ------	UNKNOWN                       
261.2157 -75.3598    4.2  22.7   -6.9   1.8803   2.8 ------	UNKNOWN                       
316.8314  -1.3767    4.5  59.6 -161.6  17.5692   2.6 ------	UNKNOWN                       
318.3351  -2.8770    4.3  58.7 -159.3  15.5179   2.7 ------	UNKNOWN                       
 28.8530 -66.4081    3.6  47.0  -53.1  13.5089   3.2 ------	UNKNOWN                       
333.8151 -23.2566    3.4  48.5 -130.3  12.7065   3.4 ------	UNKNOWN                       
339.3170 -33.4424    3.4  43.9 -116.1  13.4095   3.4 ------	UNKNOWN                       
347.1049 -44.1975    5.6  41.3  -98.2  10.1865   2.1 ------	UNKNOWN                       
Plot creation:
Sat May 30 16:51:32 EDT 2015