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
  307.3238   -11.8794   0.0153    28.1062   177.8328         1.4999290     12.520 TRIG_00539358                 
 
Foreground time interval of the image:
 -6.240  53.701 (delta_t =  59.941 [sec])
Background time interval of the image:
-179.200  -6.240 (delta_t = 172.960 [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)
 
 The mask-weighted light curves based on cleaned DPHs 
 
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   -6.240 sec. to  419.228 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.72437     ( -0.0421709   0.0423149 )
Norm@50keV  : 3.36555E-03    ( -7.54679e-05   7.54049e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          91.47 using 59 PHA bins.
# Reduced chi-squared =          1.605 for     57 degrees of freedom 
# Null hypothesis probability =   2.549772e-03
 
Photon flux (15-150 keV)    in 425.5 sec: 0.450860 ( -0.0111209  0.0111562 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.32352e-05 ( -3.05588e-07  3.05995e-07 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   -6.240 sec. to  419.228 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.986757     ( -0.203542   0.194707 )
Epeak [keV] : 69.8665      ( -5.44064 8.02861 )
Norm@50keV  : 7.64938E-03    ( -0.00146091   0.00190441 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.56 using 59 PHA bins.
# Reduced chi-squared =         0.7958 for     56 degrees of freedom 
# Null hypothesis probability =   8.643801e-01
 
Photon flux (15-150 keV)    in 425.5 sec: 0.424826 ( -0.012619  0.012685 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.24315e-05 ( -3.63334e-07  3.64739e-07 ) ergs/cm2
 
Band function
 
Time interval is from   -6.240 sec. to  419.228 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.811688   ( -0.324477   0.611708 )
beta        : -2.21427    ( 2.21427   0.246153 )
Epeak [keV] : 62.7011      ( -13.6141 12.962 )
Norm@50keV   : 9.62791E-03    ( -0.00312691   0.012981 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.45 using 59 PHA bins.
# Reduced chi-squared =         0.7900 for     55 degrees of freedom 
# Null hypothesis probability =   8.696262e-01
 
Photon flux (15-150 keV)    in 425.5 sec: 0.422766 ( 6.57723  -0.013111 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.24686e-05 ( -1.24656e-05  -3.67377e-07 ) ergs/cm2
 
Single BB
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 14.0974  (  )
R^2/D10^2   : 5.82241E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         303.80 using 59 PHA bins.
# Reduced chi-squared =         5.3298 for     57 degrees of freedom 
# Null hypothesis probability =   2.243485e-35
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.039e-06   4.446e-08
25- 50  3.892e-06   1.187e-07
50-150  5.111e-06   2.149e-07
15-150  1.004e-05   2.319e-07
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 127.971       (-11.8832      14.4235)
Norm        : 1.87591       (-0.0597301     0.0618426)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.76 using 59 PHA bins.
# Reduced chi-squared =         0.8906 for     57 degrees of freedom 
# Null hypothesis probability =   7.067831e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.073e-06   1.119e-07
25- 50  3.749e-06   1.511e-07
50-150  6.900e-06   1.474e-06
15-150  1.272e-05   1.540e-06
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.50894        (-0.766284      0.801983)
R1^2/D10^2  : 0.348467        (-0.0934988      0.146173)
kT2 [keV]   : 22.6231        (-2.03032      2.72591)
R2^2/D10^2  : 7.55406E-03    (-0.00282975   0.00367193)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.15 using 59 PHA bins.
# Reduced chi-squared =         0.8936 for     55 degrees of freedom 
# Null hypothesis probability =   6.966267e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.737e-06   1.570e-07
25- 50  3.860e-06   2.089e-07
50-150  6.654e-06   5.234e-07
15-150  1.225e-05   6.808e-07
Peak spectrum fit
Power-law model
 
Time interval is from  232.564 sec. to  233.564 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.19829     ( -0.126594   0.125874 )
Norm@50keV  : 2.04276E-02    ( -0.00152671   0.00152624 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.15 using 59 PHA bins.
# Reduced chi-squared =          1.143 for     57 degrees of freedom 
# Null hypothesis probability =   2.142985e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.39720 ( -0.18144  0.181593 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.07347e-07 ( -1.75022e-08  1.76199e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from  232.564 sec. to  233.564 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.633418     ( -0.578094   0.508088 )
Epeak [keV] : 127.103      ( -40.1474 507.406 )
Norm@50keV  : 3.84260E-02    ( -0.0163487   0.0334527 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.51 using 59 PHA bins.
# Reduced chi-squared =          1.098 for     56 degrees of freedom 
# Null hypothesis probability =   2.854719e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.34506 ( -0.188  0.18768 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.99531e-07 ( -1.9234e-08  1.9181e-08 ) ergs/cm2
 
Band function
 
Time interval is from  232.564 sec. to  233.564 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.293053   ( -0.772   0.281996 )
beta        : -1.49806    ( 1.49991   0.306736 )
Epeak [keV] : 85.2614      ( -52.1373 159.639 )
Norm@50keV   : 6.18496E-02    ( -0.043939   208.999 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.13 using 59 PHA bins.
# Reduced chi-squared =          1.111 for     55 degrees of freedom 
# Null hypothesis probability =   2.652878e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.33856 ( 4.66144  -0.18788 ) 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]    : 17.8907  (-1.66068  1.88219)
R^2/D10^2   : 0.160969  (-0.0453828   0.0613673)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          86.21 using 59 PHA bins.
# Reduced chi-squared =          1.512 for     57 degrees of freedom 
# Null hypothesis probability =   7.503305e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.034e-08   1.455e-09
25- 50  4.758e-08   4.920e-09
50-150  1.104e-07   1.348e-08
15-150  1.683e-07   1.565e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 9.79470       (-0.744411     0.744379)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          82.89 using 59 PHA bins.
# Reduced chi-squared =          1.454 for     57 degrees of freedom 
# Null hypothesis probability =   1.416922e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.439e-08   2.100e-09
25- 50  4.691e-08   7.135e-09
50-150  1.029e-07   4.010e-08
15-150  1.742e-07   5.118e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 9.18930        (-2.86359      3.1264)
R1^2/D10^2  : 0.817288        (-0.429761      1.04701)
kT2 [keV]   : 31.4487        (-8.34527      28.0332)
R2^2/D10^2  : 1.92678E-02    (-0.0164591   0.0399887)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.49 using 59 PHA bins.
# Reduced chi-squared =          1.118 for     55 degrees of freedom 
# Null hypothesis probability =   2.548856e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.647e-08   6.381e-09
25- 50  4.800e-08   1.697e-08
50-150  1.367e-07   6.552e-08
15-150  2.012e-07   7.830e-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: 1.76533     ( -0.166841   0.171572 )
Norm@50keV  : 1.64798E-03    ( -0.000188646   0.000186533 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.88 using 59 PHA bins.
# Reduced chi-squared =          1.086 for     57 degrees of freedom 
# Null hypothesis probability =   3.061938e-01
 
Photon flux (15-150 keV)    in 59.94 sec: 0.224108 ( -0.0225966  0.0226057 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.10698e-07 ( -1.06437e-07  1.08402e-07 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.192835     ( -1.25753   0.983229 )
Epeak [keV] : 46.8134      ( -5.8089 9.80989 )
Norm@50keV  : 2.15449E-02    ( -0.0215473   0.0912812 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.41 using 59 PHA bins.
# Reduced chi-squared =         0.8466 for     56 degrees of freedom 
# Null hypothesis probability =   7.862329e-01
 
Photon flux (15-150 keV)    in 59.94 sec: 0.209174 ( -0.023371  0.023473 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.64679e-07 ( -1.04463e-07  1.16787e-07 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.617544   ( -1.27727   1.88832 )
beta        : -3.12662    ( 3.12282   0.909967 )
Epeak [keV] : 44.3153      ( -8.85081 10.1512 )
Norm@50keV   : 3.95697E-02    ( -0.0344649   0.625183 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.77 using 59 PHA bins.
# Reduced chi-squared =         0.8504 for     55 degrees of freedom 
# Null hypothesis probability =   7.772310e-01
 
Photon flux (15-150 keV)    in 59.94 sec: 0.209288 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.92023e-07 ( 0  0 ) ergs/cm2
 
 S(25-50 keV) vs. S(50-100 keV) plot 
 
S(25-50 keV)  = 3.62e-06
S(50-100 keV) = 4.38e-06
 T90 vs. Hardness ratio plot 
 
T90                                   = 326.091999948025 sec.
Hardness ratio (energy fluence ratio) = 1.20994
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 1.39562
Count Ratio (50-100 keV) / (15-25 keV) = 0.874806
 Mask shadow pattern 
 
IMX = -5.337062704727726E-01, IMY = -2.019652793920537E-02
 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:
-179.200000 -6.240000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4187  35.4994    7.6  40.8    1.3  -0.4183  -1.5    9.6	Her X-1                       
263.1398 -24.6549   12.5  40.0 -101.3   0.7160   0.9    9.0	GX 1+4                        
268.3323  -1.5094    2.0  20.9  -72.0   1.2093   5.9    4.0	SW J1753.5-0127               
270.2216 -25.0957    3.7  36.8 -110.3   1.1029   3.2    3.5	GX 5-1                        
270.3714 -25.8509    3.1  37.4 -111.1   1.3379   3.7    7.5	GRS 1758-258                  
273.9355 -13.9275    4.8  25.4 -105.2   0.4940   2.4    7.7	GX 17+2                       
275.7883 -30.4511   10.3  39.8 -121.0   0.4562   1.1    8.7	H1820-303                     
285.1089 -24.7924   29.0  32.6 -133.0  -0.0902  -0.4    8.6	HT1900.1-2455                 
288.8193  10.9012    1.8   3.5   71.6   1.2004   6.5    2.9	GRS 1915+105                  
299.7999  35.1594    5.3  29.7   64.8   0.6388   2.2   10.6	Cyg X-1                       
308.1983  41.0242    2.5  38.1   69.7   2.7478   4.7    5.9	Cyg X-3                       
334.9857 -15.9748    2.7  53.0  160.4   3.7753   4.3 ------	UNKNOWN                       
330.2602 -31.0988    3.2  56.7  179.2   3.8489   3.6 ------	UNKNOWN                       
312.1636 -24.4193    2.1  40.4 -172.8   1.3875   5.6 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
-6.240000 53.700640
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4250  35.4129   55.2  40.7    1.2   0.0347   0.2    4.5	Her X-1                       
262.9354 -24.6505    7.8  40.1 -101.0   0.6350   1.5    7.0	GX 1+4                        
268.3442  -1.5048    5.3  20.9  -72.0  -0.2664  -2.2    3.4	SW J1753.5-0127               
270.3139 -25.2137    7.2  36.8 -110.5   0.3473   1.6    8.2	GX 5-1                        
270.3123 -25.5996    4.1  37.2 -110.8   0.6498   3.0    8.6	GRS 1758-258                  
274.0356 -13.9002    8.4  25.3 -105.4  -0.1745  -1.4    8.4	GX 17+2                       
275.9918 -30.2277    4.3  39.5 -121.2   0.6039   2.7    9.0	H1820-303                     
285.2260 -24.9599    4.9  32.8 -133.2   0.3198   2.3   10.6	HT1900.1-2455                 
288.9227  11.0347   35.4   3.7   72.0  -0.0328  -0.3    9.1	GRS 1915+105                  
299.5535  35.0974   14.3  29.6   64.5   0.1341   0.8    6.5	Cyg X-1                       
308.2711  41.0354    5.4  38.2   69.7  -0.6964  -2.2    8.8	Cyg X-3                       
307.3238 -11.8793    0.9  28.1  177.8   1.4998  12.5 ------	UNKNOWN                       
286.3283 -37.2860    2.5  45.1 -135.5   1.2417   4.7 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
111.500600 467.291700
468.800000 662.880000
720.800000 782.890000
900.800000 962.884200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
268.2191  -1.3845  311.4  40.2  -60.4  -0.0439  -0.0    9.8	SW J1753.5-0127               
270.3528 -25.0830    3.3  37.4  -98.6   4.3940   3.5    3.7	GX 5-1                        
270.2423 -25.7676    3.3  37.6  -99.6   4.7491   3.5    3.6	GRS 1758-258                  
274.0696 -14.0631    2.2  32.5  -80.2   4.5178   5.3    4.0	GX 17+2                       
275.9499 -30.3870   33.8  34.5 -110.0   0.2801   0.3    1.8	H1820-303                     
285.2043 -24.9233    7.0  24.7 -107.6   0.9472   1.6    9.2	HT1900.1-2455                 
288.7596  10.9400    1.9  29.3  -22.3   3.2632   6.2    2.3	GRS 1915+105                  
299.7766  35.1077    5.5  47.5    9.0   2.3017   2.1   10.7	Cyg X-1                       
307.9913  40.9329    5.4  52.8   18.1   5.7200   2.1    5.5	Cyg X-3                       
307.3174 -11.8565    0.3   0.1 -100.5  22.9955  44.7 ------	UNKNOWN                       
331.9160 -66.5961    3.0  57.2 -173.9   9.8885   3.8 ------	UNKNOWN                       
275.0118  35.0206    3.6  56.0  -14.5   5.7086   3.2 ------	UNKNOWN                       
268.4098  29.0958    2.3  55.6  -24.3   8.1171   5.0 ------	UNKNOWN                       
267.4992  21.7498    2.6  51.6  -32.0   6.3311   4.5 ------	UNKNOWN                       
Plot creation:
Sat May 30 17:53:50 EDT 2015