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
  219.2851    27.7949   0.0110    51.8737    -6.3870         3.3835223     17.499 TRIG_00148646                 
 
Foreground time interval of the image:
 -3.408  30.064 (delta_t =  33.472 [sec])
Background time interval of the image:
-71.019  -3.408 (delta_t =  67.611 [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 1.024000
 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 1.024000
 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 1.024000
 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   -3.408 sec. to   30.064 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.48168     ( -0.138371   0.138809 )
Norm@50keV  : 6.93346E-03    ( -0.000551449   0.000550851 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.04 using 59 PHA bins.
# Reduced chi-squared =         0.9305 for     57 degrees of freedom 
# Null hypothesis probability =   6.243914e-01
 
Photon flux (15-150 keV)    in 33.47 sec: 0.861370 ( -0.0726311  0.0728737 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.20823e-06 ( -1.86914e-07  1.87509e-07 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   -3.408 sec. to   30.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.24892     ( -0.57413   0.306486 )
Epeak [keV] : 175.560      ( -175.56 -175.56 )
Norm@50keV  : 8.93286E-03    ( -0.00246299   0.00742333 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.46 using 59 PHA bins.
# Reduced chi-squared =         0.9368 for     56 degrees of freedom 
# Null hypothesis probability =   6.095882e-01
 
Photon flux (15-150 keV)    in 33.47 sec: 0.851773 ( -0.075546  0.075725 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.18607e-06 ( -1.96124e-07  1.94909e-07 ) ergs/cm2
 
Band function
 
Time interval is from   -3.408 sec. to   30.064 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.24982   ( 1.15027   1.15027 )
beta        : -9.32259    ( 9.3705   19.3462 )
Epeak [keV] : 176.103      ( -82.6453 -176.103 )
Norm@50keV   : 8.92290E-03    ( -0.00172991   0.00589558 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.46 using 59 PHA bins.
# Reduced chi-squared =         0.9539 for     55 degrees of freedom 
# Null hypothesis probability =   5.721903e-01
 
Photon flux (15-150 keV)    in 33.47 sec: 0.847105 (    ) 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]    : 16.8036  (-1.65607  1.86847)
R^2/D10^2   : 6.60018E-02  (-0.0205002   0.0291518)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          89.85 using 59 PHA bins.
# Reduced chi-squared =          1.576 for     57 degrees of freedom 
# Null hypothesis probability =   3.586098e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.274e-07   2.010e-08
25- 50  5.586e-07   6.125e-08
50-150  1.122e-06   1.600e-07
15-150  1.808e-06   1.777e-07
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 3.55941       (-0.282162     0.282148)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.90 using 59 PHA bins.
# Reduced chi-squared =         0.9455 for     57 degrees of freedom 
# Null hypothesis probability =   5.922735e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.967e-07   2.915e-08
25- 50  5.707e-07   5.974e-08
50-150  1.252e-06   3.411e-07
15-150  2.119e-06   5.797e-07
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.02489        (-1.94633      2.42895)
R1^2/D10^2  : 0.852081        (-0.529153      1.6173)
kT2 [keV]   : 27.3046        (-5.59447      11.6526)
R2^2/D10^2  : 9.87961E-03    (-0.00700854   0.0091548)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.16 using 59 PHA bins.
# Reduced chi-squared =         0.9666 for     55 degrees of freedom 
# Null hypothesis probability =   5.450927e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.677e-07   1.146e-07
25- 50  5.544e-07   1.808e-07
50-150  1.364e-06   5.584e-07
15-150  2.186e-06   8.004e-07
Peak spectrum fit
Power-law model
 
Time interval is from    0.028 sec. to    1.028 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.29340     ( -0.253933   0.248764 )
Norm@50keV  : 2.23271E-02    ( -0.00342025   0.00341355 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.71 using 59 PHA bins.
# Reduced chi-squared =         0.9072 for     57 degrees of freedom 
# Null hypothesis probability =   6.731106e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.66048 ( -0.431069  0.433857 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.2099e-07 ( -3.5362e-08  3.55183e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from    0.028 sec. to    1.028 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.456570     ( -1.48867   0.946067 )
Epeak [keV] : 99.7088      ( -31.7206 -99.7204 )
Norm@50keV  : 5.57007E-02    ( -0.0354096   0.21502 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.10 using 59 PHA bins.
# Reduced chi-squared =         0.8946 for     56 degrees of freedom 
# Null hypothesis probability =   6.967713e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.58637 ( -0.44185  0.44443 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.12999e-07 ( -3.913e-08  3.7972e-08 ) ergs/cm2
 
Band function
 
Time interval is from    0.028 sec. to    1.028 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.88301   ( -14.1847   -4.88301 )
beta        : -1.54018    ( -0.505731   0.329658 )
Epeak [keV] : 34.5383      ( -14.5081 10.1445 )
Norm@50keV   : 253.854    ( -38.1842   7538.33 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.46 using 59 PHA bins.
# Reduced chi-squared =         0.8810 for     55 degrees of freedom 
# Null hypothesis probability =   7.211118e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.146e-07 ( -2.14593e-07  -3.65e-08 ) ergs/cm2
 
Single BB
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 17.4336  (-2.82744  3.54388)
R^2/D10^2   : 0.196493  (-0.0932321   0.16491)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.38 using 59 PHA bins.
# Reduced chi-squared =         0.9540 for     57 degrees of freedom 
# Null hypothesis probability =   5.740524e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.208e-08   3.434e-09
25- 50  5.450e-08   1.391e-08
50-150  1.192e-07   3.504e-08
15-150  1.858e-07   3.640e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 11.2996       (-1.74099     1.74068)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.93 using 59 PHA bins.
# Reduced chi-squared =         0.9462 for     57 degrees of freedom 
# Null hypothesis probability =   5.908046e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.814e-08   1.620e-08
25- 50  5.413e-08   3.069e-08
50-150  1.187e-07   6.685e-08
15-150  2.010e-07   1.130e-07
Double BB
 
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.38 using 59 PHA bins.
#Fit statistic : Chi-Squared =          47.61 using 59 PHA bins.
#Fit statistic : Chi-Squared =          47.40 using 59 PHA bins.
#Fit statistic : Chi-Squared =          47.37 using 59 PHA bins.
# Reduced chi-squared =         0.9887 for     55 degrees of freedom 
# Reduced chi-squared =         0.8656 for     55 degrees of freedom 
# Reduced chi-squared =         0.8617 for     55 degrees of freedom 
# Reduced chi-squared =         0.8614 for     55 degrees of freedom 
# Null hypothesis probability =   4.983415e-01
# Null hypothesis probability =   7.501559e-01
# Null hypothesis probability =   7.571379e-01
# Null hypothesis probability =   7.578065e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  0.000e+00   0.000e+00
25- 50  0.000e+00   0.000e+00
50-150  0.000e+00   0.000e+00
15-150  0.000e+00   0.000e+00
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: 1.48168     ( -0.138371   0.138809 )
Norm@50keV  : 6.93346E-03    ( -0.000551449   0.000550851 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.04 using 59 PHA bins.
# Reduced chi-squared =         0.9305 for     57 degrees of freedom 
# Null hypothesis probability =   6.243914e-01
 
Photon flux (15-150 keV)    in 33.47 sec: 0.861370 ( -0.0726311  0.0728737 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.20823e-06 ( -1.86914e-07  1.87509e-07 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.24892     ( -0.57413   0.306486 )
Epeak [keV] : 175.560      ( -175.56 -175.56 )
Norm@50keV  : 8.93286E-03    ( -0.00246299   0.00742333 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.46 using 59 PHA bins.
# Reduced chi-squared =         0.9368 for     56 degrees of freedom 
# Null hypothesis probability =   6.095882e-01
 
Photon flux (15-150 keV)    in 33.47 sec: 0.851773 ( -0.075546  0.075725 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.18607e-06 ( -1.96124e-07  1.94909e-07 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.24982   ( 1.15027   1.15027 )
beta        : -9.32259    ( 9.3705   19.3462 )
Epeak [keV] : 176.103      ( -82.6457 -176.103 )
Norm@50keV   : 8.92290E-03    ( -0.00172991   0.00589558 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.46 using 59 PHA bins.
# Reduced chi-squared =         0.9539 for     55 degrees of freedom 
# Null hypothesis probability =   5.721903e-01
 
Photon flux (15-150 keV)    in 33.47 sec: 0.847105 (    ) 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)  = 5.41e-07
S(50-100 keV) = 7.75e-07
 T90 vs. Hardness ratio plot 
 
T90                                   = 27.4560000300407 sec.
Hardness ratio (energy fluence ratio) = 1.43253
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 1.46612
Count Ratio (50-100 keV) / (15-25 keV) = 1.33971
 Mask shadow pattern 
 
IMX = 1.266233766103257E+00, IMY = 1.417400962895539E-01
 TIME vs. PHA plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
 TIME vs. DetID plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
 100 us light curve (15-350 keV)
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
 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:
-71.019400 -3.408000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.2701 -60.5353    5.1  45.2  179.2   0.4124   2.3    5.4	Cen X-3                       
186.6183 -62.6773    3.3  42.4  168.3   0.6467   3.5    5.7	GX 301-2                      
244.9854 -15.6433    1.8  39.1   64.5   2.1767   6.7    0.4	Sco X-1                       
220.8005 -72.4364    2.8  51.3  150.1   2.1056   4.1 ------	UNKNOWN                       
226.1013  27.4431    2.4  53.8    0.8   1.7199   4.8 ------	UNKNOWN                       
165.0318 -60.3300    2.8  47.1 -178.3   0.7560   4.1 ------	UNKNOWN                       
146.8285 -46.3098    2.1  51.9 -155.9   1.5466   5.4 ------	UNKNOWN                       
186.1361  25.6857    2.8  50.7  -44.6   2.1001   4.2 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
-3.408000 30.064000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
169.9685 -60.6345    6.2  45.4  179.3   0.2732   1.9   10.2	Cen X-3                       
186.8988 -62.6651    4.2  42.3  168.1  -0.3983  -2.7    9.2	GX 301-2                      
244.9307 -15.7551    5.5  39.0   64.6   0.5506   2.1    7.4	Sco X-1                       
242.5938  15.5564    2.4  53.2   25.0   2.1717   4.8 ------	UNKNOWN                       
219.2851  27.7949    0.7  51.9   -6.4   3.3834  17.5 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
272.780600 302.090000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5192  35.2774   15.7  30.8   52.7   0.0568   0.7    4.9	Her X-1                       
252.6389   9.0290    2.8  36.6  100.1   0.5515   4.1 ------	UNKNOWN                       
276.4918  62.8671    2.4  50.7   15.4   0.7449   4.7 ------	UNKNOWN                       
223.0159  41.8977    2.1  14.4   -3.1   0.2730   5.5 ------	UNKNOWN                       
Plot creation:
Sun May 31 16:09:48 EDT 2015