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
  338.5943    38.6847   0.0066    39.1591    42.6777         5.6777049     28.986 TRIG_00146227                 
 
Foreground time interval of the image:
-13.676  30.037 (delta_t =  43.713 [sec])
Background time interval of the image:
-299.264 -13.676 (delta_t = 285.588 [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 2.048000
 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 2.048000
 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 2.048000
 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  -13.676 sec. to   76.388 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.34036     ( -0.0607487   0.060376 )
Norm@50keV  : 7.18035E-03    ( -0.000248932   0.000248859 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.35 using 59 PHA bins.
# Reduced chi-squared =          1.024 for     57 degrees of freedom 
# Null hypothesis probability =   4.254947e-01
 
Photon flux (15-150 keV)    in 90.06 sec: 0.863327 ( -0.0325717  0.0326548 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.32961e-06 ( -2.28537e-07  2.28807e-07 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from  -13.676 sec. to   76.388 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.788979     ( -0.270334   0.254423 )
Epeak [keV] : 122.331      ( -22.908 55.5365 )
Norm@50keV  : 1.28050E-02    ( -0.00292424   0.00403891 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.73 using 59 PHA bins.
# Reduced chi-squared =         0.7809 for     56 degrees of freedom 
# Null hypothesis probability =   8.835406e-01
 
Photon flux (15-150 keV)    in 90.06 sec: 0.837325 ( -0.034439  0.034524 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.15204e-06 ( -2.4644e-07  2.44783e-07 ) ergs/cm2
 
Band function
 
Time interval is from  -13.676 sec. to   76.388 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.179654   ( -0.801853   2.90614 )
beta        : -1.56285    ( 1.5647   0.149962 )
Epeak [keV] : 68.3709      ( -34.8149 92.6373 )
Norm@50keV   : 2.98621E-02    ( -0.0177421   3.54897 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.87 using 59 PHA bins.
# Reduced chi-squared =         0.7795 for     55 degrees of freedom 
# Null hypothesis probability =   8.828535e-01
 
Photon flux (15-150 keV)    in 90.06 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.15982e-06 ( -6.15919e-06  -2.41199e-07 ) ergs/cm2
 
Single BB
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 18.3221  (  )
R^2/D10^2   : 5.10156E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         163.94 using 59 PHA bins.
# Reduced chi-squared =         2.8761 for     57 degrees of freedom 
# Null hypothesis probability =   2.766933e-12
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.070e-07   2.112e-08
25- 50  1.439e-06   7.385e-08
50-150  3.521e-06   1.864e-07
15-150  5.267e-06   2.184e-07
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 3.66350       (-0.127365     0.127309)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          87.69 using 59 PHA bins.
# Reduced chi-squared =          1.538 for     57 degrees of freedom 
# Null hypothesis probability =   5.582954e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.215e-07   3.278e-08
25- 50  1.580e-06   6.574e-08
50-150  3.466e-06   1.283e-07
15-150  5.868e-06   2.310e-07
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.53755        (-1.22166      1.36972)
R1^2/D10^2  : 0.382900        (-0.133723      0.233102)
kT2 [keV]   : 29.0717        (-3.53745      5.5185)
R2^2/D10^2  : 8.37765E-03    (-0.00388929   0.00523531)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.52 using 59 PHA bins.
# Reduced chi-squared =         0.7731 for     55 degrees of freedom 
# Null hypothesis probability =   8.905102e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.767e-07   8.295e-08
25- 50  1.547e-06   1.400e-07
50-150  4.039e-06   5.827e-07
15-150  6.163e-06   6.962e-07
Peak spectrum fit
Power-law model
 
Time interval is from   12.220 sec. to   13.220 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.41115     ( -0.252059   0.248371 )
Norm@50keV  : 1.74255E-02    ( -0.00270609   0.00270165 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.00 using 59 PHA bins.
# Reduced chi-squared =         0.8070 for     57 degrees of freedom 
# Null hypothesis probability =   8.511634e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.12752 ( -0.343704  0.34472 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.67998e-07 ( -2.77559e-08  2.79116e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   12.220 sec. to   13.220 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.941522     ( -1.11383   0.812619 )
Epeak [keV] : 116.280      ( -52.426 -116.28 )
Norm@50keV  : 2.99868E-02    ( -0.0147869   0.0749502 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.24 using 59 PHA bins.
# Reduced chi-squared =         0.8079 for     56 degrees of freedom 
# Null hypothesis probability =   8.475965e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.10453 ( -0.17544  0.34787 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.6445e-07 ( -2.9354e-08  2.9002e-08 ) ergs/cm2
 
Band function
 
Time interval is from   12.220 sec. to   13.220 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.91556   ( -4.91556   -4.91556 )
beta        : -1.61616    ( -0.470579   0.317667 )
Epeak [keV] : 29.6069      ( -29.6069 8.61081 )
Norm@50keV   : 568.421    ( -87.0482   6.56166e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.58 using 59 PHA bins.
# Reduced chi-squared =         0.7924 for     55 degrees of freedom 
# Null hypothesis probability =   8.664396e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.10704 ( 4.89296  -0.35432 ) 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]    : 15.9623  (-3.04893  3.94472)
R^2/D10^2   : 0.202661  (-0.109527   0.225809)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.81 using 59 PHA bins.
# Reduced chi-squared =         0.9616 for     57 degrees of freedom 
# Null hypothesis probability =   5.575636e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.068e-08   3.675e-09
25- 50  4.486e-08   1.059e-08
50-150  7.982e-08   2.465e-08
15-150  1.354e-07   2.995e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 8.90997       (-1.38113     1.38099)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.27 using 59 PHA bins.
# Reduced chi-squared =         0.8118 for     57 degrees of freedom 
# Null hypothesis probability =   8.442169e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.219e-08   1.280e-08
25- 50  4.269e-08   2.424e-08
50-150  9.362e-08   5.225e-08
15-150  1.585e-07   9.045e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.68830        (-2.86169      3.66925)
R1^2/D10^2  : 1.16260        (-0.774246      2.97247)
kT2 [keV]   : 34.3692        (-27.9176      -34.35)
R2^2/D10^2  : 1.07687E-02    (-0.0105265   0.0520172)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.39 using 59 PHA bins.
# Reduced chi-squared =         0.7889 for     55 degrees of freedom 
# Null hypothesis probability =   8.710256e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.858e-08   1.057e-08
25- 50  4.553e-08   2.484e-08
50-150  1.041e-07   5.925e-08
15-150  1.682e-07   8.635e-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: 1.23796     ( -0.0747097   0.0739219 )
Norm@50keV  : 9.42373E-03    ( -0.000412465   0.000411999 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.90 using 59 PHA bins.
# Reduced chi-squared =          1.068 for     57 degrees of freedom 
# Null hypothesis probability =   3.373329e-01
 
Photon flux (15-150 keV)    in 43.71 sec: 1.11242 ( -0.0523588  0.0525266 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.13559e-06 ( -1.85492e-07  1.85718e-07 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.516322     ( -0.356104   0.328957 )
Epeak [keV] : 117.251      ( -21.0971 49.575 )
Norm@50keV  : 1.97562E-02    ( -0.00552408   0.00833497 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.63 using 59 PHA bins.
# Reduced chi-squared =         0.8149 for     56 degrees of freedom 
# Null hypothesis probability =   8.372888e-01
 
Photon flux (15-150 keV)    in 43.71 sec: 1.07282 ( -0.05497  0.05515 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.00565e-06 ( -1.98588e-07  1.97705e-07 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -2.66274E-02   ( -0.751977   1.71592 )
beta        : -1.58281    ( 1.58188   0.207071 )
Epeak [keV] : 79.2676      ( -31.699 71.438 )
Norm@50keV   : 3.74511E-02    ( -0.0225855   0.439416 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.59 using 59 PHA bins.
# Reduced chi-squared =         0.8107 for     55 degrees of freedom 
# Null hypothesis probability =   8.410225e-01
 
Photon flux (15-150 keV)    in 43.71 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)  = 1.44e-06
S(50-100 keV) = 2.28e-06
 T90 vs. Hardness ratio plot 
 
T90                                   = 69.0200000107288 sec.
Hardness ratio (energy fluence ratio) = 1.58333
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 1.75287
Count Ratio (50-100 keV) / (15-25 keV) = 1.56575
 Mask shadow pattern 
 
IMX = 5.987233751923549E-01, IMY = -5.520548339040845E-01
 TIME vs. PHA plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
 TIME vs. DetID plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
 100 us light curve (15-350 keV)
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
 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:
-299.264000 -13.676000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.1998  40.7858    7.6  36.6   80.9   0.9171   1.5   10.8	Cyg X-3                       
326.1587  38.3041   40.1  38.8   58.2   0.1764   0.3    1.2	Cyg X-2                       
  9.0027  61.7834    3.4  21.7   -7.8   0.7329   3.4 ------	UNKNOWN                       
 95.6953  74.9287    2.9  25.9  -89.9   1.0925   3.9 ------	UNKNOWN                       
 69.5988  49.8086    3.0  45.8  -56.5   4.1784   3.8 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
-13.676000 30.036580
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.3222  41.0715    0.0  36.4   80.8   0.2240   1.0   12.0	Cyg X-3                       
326.0374  38.2134   10.1  38.9   58.3   0.2822   1.1    9.1	Cyg X-2                       
338.5944  38.6847    0.4  39.2   42.7   5.6766  29.0 ------	UNKNOWN                       
359.4052  66.3542    2.2  15.7   -3.3   0.4044   5.2 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
85.436600 302.787000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.6067  35.1851    0.6  31.1  144.3   5.2865  20.7    1.3	Cyg X-1                       
308.1175  40.9616    1.2  23.4  153.8   1.8893   9.8    0.6	Cyg X-3                       
325.9104  38.2809    0.0   9.9  140.1  -0.2520  -1.6   12.5	Cyg X-2                       
255.2353  57.8840    3.1  54.7 -171.8   2.3228   3.8 ------	UNKNOWN                       
331.3209  58.3015    2.8  20.2 -142.7   0.6440   4.1 ------	UNKNOWN                       
Plot creation:
Sun May 31 16:31:52 EDT 2015