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
  235.8799    -7.2988   0.0200    36.0466   -63.6585         2.0262079      9.633 TRIG_00531428                 
 
Foreground time interval of the image:
  4.420  82.701 (delta_t =  78.281 [sec])
Background time interval of the image:
-239.000   4.420 (delta_t = 243.420 [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 72.000000
 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 72.000000
 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 72.000000
 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    4.420 sec. to   83.012 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.47808     ( -0.229509   0.227962 )
Norm@50keV  : 1.87516E-03    ( -0.000248916   0.000248097 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.72 using 59 PHA bins.
# Reduced chi-squared =         0.8548 for     57 degrees of freedom 
# Null hypothesis probability =   7.742381e-01
 
Photon flux (15-150 keV)    in 78.59 sec: 0.232739 ( -0.0321597  0.03235 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.40319e-06 ( -1.98579e-07  2.00485e-07 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from    4.420 sec. to   83.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.510612     ( -1.47286   1.03929 )
Epeak [keV] : 76.1070      ( -21.3349 -76.0969 )
Norm@50keV  : 5.76153E-03    ( -0.00576376   0.0255084 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.37 using 59 PHA bins.
# Reduced chi-squared =         0.8281 for     56 degrees of freedom 
# Null hypothesis probability =   8.169389e-01
 
Photon flux (15-150 keV)    in 78.59 sec: 0.221565 ( -0.034862  0.034729 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.29629e-06 ( -2.34096e-07  2.35456e-07 ) ergs/cm2
 
Band function
 
Time interval is from    4.420 sec. to   83.012 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 9.86235E-02   ( -1.34019   4.06019 )
beta        : -2.05286    ( 2.054   0.599764 )
Epeak [keV] : 59.6879      ( -32.4682 79.8258 )
Norm@50keV   : 1.29036E-02    ( -0.0142715   22.3543 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.13 using 59 PHA bins.
# Reduced chi-squared =         0.8205 for     55 degrees of freedom 
# Null hypothesis probability =   8.263571e-01
 
Photon flux (15-150 keV)    in 78.59 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.30795e-06 ( 0  0 ) ergs/cm2
 
Single BB
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 14.6995  (-2.02273  2.49649)
R^2/D10^2   : 2.87787E-02  (-0.0124585   0.0204625)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.98 using 59 PHA bins.
# Reduced chi-squared =         0.8944 for     57 degrees of freedom 
# Null hypothesis probability =   6.991173e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.026e-07   2.675e-08
25- 50  4.002e-07   7.619e-08
50-150  5.831e-07   1.655e-07
15-150  1.086e-06   1.914e-07
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (-81.5119      -199.363)
Norm        : 0.961714       (-0.126004     0.126256)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.71 using 59 PHA bins.
# Reduced chi-squared =         0.8369 for     57 degrees of freedom 
# Null hypothesis probability =   8.049867e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.882e-07   1.059e-07
25- 50  3.620e-07   1.991e-07
50-150  7.940e-07   4.393e-07
15-150  1.344e-06   7.395e-07
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 12.1111        (-1.90687      2.39665)
R1^2/D10^2  : 5.05895E-02        (-0.0233321      0.0872605)
kT2 [keV]   : 198.246        (-198.338      -198.339)
R2^2/D10^2  : 2.05746E-05    (-1.27287e-05   0.00122026)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.15 using 59 PHA bins.
# Reduced chi-squared =         0.8027 for     55 degrees of freedom 
# Null hypothesis probability =   8.524008e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.255e-07   4.938e-08
25- 50  4.101e-07   1.884e-07
50-150  7.734e-07   2.457e-07
15-150  1.309e-06   3.980e-07
Peak spectrum fit
Power-law model
 
Time interval is from    6.196 sec. to    7.196 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.785376     ( -0.75154   0.621917 )
Norm@50keV  : 6.63171E-03    ( -0.00270321   0.0024707 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.23 using 59 PHA bins.
# Reduced chi-squared =          1.074 for     57 degrees of freedom 
# Null hypothesis probability =   3.268856e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.762588 ( -0.274281  0.287476 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.79759e-08 ( -2.53936e-08  2.55015e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from    6.196 sec. to    7.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.419020     ( -5.20913   -0.418638 )
Epeak [keV] : 301.924      ( -301.708 -301.708 )
Norm@50keV  : 8.87883E-03    ( -0.00478269   0.648422 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.18 using 59 PHA bins.
# Reduced chi-squared =          1.092 for     56 degrees of freedom 
# Null hypothesis probability =   2.954968e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.744157 ( -0.310505  0.300833 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.74765e-08 ( -2.63333e-08  2.57715e-08 ) ergs/cm2
 
Band function
 
Time interval is from    6.196 sec. to    7.196 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.787761   ( 0.787881   0.787881 )
beta        : -0.785374    ( -0.621608   0.751582 )
Epeak [keV] : 15.1896      ( -15.1892 -15.1892 )
Norm@50keV   : 9.81466E-03    ( -0.00557903   193702 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.23 using 59 PHA bins.
# Reduced chi-squared =          1.113 for     55 degrees of freedom 
# Null hypothesis probability =   2.625082e-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]    : 30.0539  (-10.3884  27.3863)
R^2/D10^2   : 1.12452E-02  (-0.0112452   0.0299914)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.65 using 59 PHA bins.
# Reduced chi-squared =          1.082 for     57 degrees of freedom 
# Null hypothesis probability =   3.134321e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.587e-09   1.055e-09
25- 50  9.798e-09   6.050e-09
50-150  6.247e-08   3.759e-08
15-150  7.386e-08   4.586e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 3.36199       (-1.18367     1.18336)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.71 using 59 PHA bins.
# Reduced chi-squared =          1.153 for     57 degrees of freedom 
# Null hypothesis probability =   2.006535e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.382e-09   5.225e-09
25- 50  1.612e-08   1.008e-08
50-150  3.536e-08   2.193e-08
15-150  5.987e-08   3.715e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.01667        (-4.82125      55.8745)
R1^2/D10^2  : 1.78175        (-1.92751      31.0864)
kT2 [keV]   : 34.2472        (-13.0035      -34.2466)
R2^2/D10^2  : 7.37257E-03    (-0.00736107   0.0220563)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.38 using 59 PHA bins.
# Reduced chi-squared =          1.098 for     55 degrees of freedom 
# Null hypothesis probability =   2.875231e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.634e-09   3.655e-09
25- 50  1.095e-08   5.595e-09
50-150  6.280e-08   3.682e-08
15-150  7.939e-08   4.264e-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: 1.48704     ( -0.228022   0.226857 )
Norm@50keV  : 1.88176E-03    ( -0.000249198   0.000248758 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.28 using 59 PHA bins.
# Reduced chi-squared =         0.8646 for     57 degrees of freedom 
# Null hypothesis probability =   7.565760e-01
 
Photon flux (15-150 keV)    in 78.28 sec: 0.234109 ( -0.0322505  0.0324388 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.40039e-06 ( -1.97896e-07  1.99864e-07 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.413013     ( -1.51374   1.0811 )
Epeak [keV] : 72.9002      ( -18.9134 925.412 )
Norm@50keV  : 6.54301E-03    ( -0.00654452   0.0305808 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.46 using 59 PHA bins.
# Reduced chi-squared =         0.8296 for     56 degrees of freedom 
# Null hypothesis probability =   8.144988e-01
 
Photon flux (15-150 keV)    in 78.28 sec: 0.221636 ( -0.035036  0.034935 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.28354e-06 ( -2.31904e-07  2.34824e-07 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.131167   ( -1.27792   -0.155073 )
beta        : -2.12981    ( 2.12922   0.634729 )
Epeak [keV] : 59.8092      ( -30.9637 76.1703 )
Norm@50keV   : 1.34063E-02    ( -0.014801   22.2619 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.29 using 59 PHA bins.
# Reduced chi-squared =         0.8235 for     55 degrees of freedom 
# Null hypothesis probability =   8.217527e-01
 
Photon flux (15-150 keV)    in 78.28 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.2982e-06 ( -1.29766e-06  -2.20069e-07 ) ergs/cm2
 
 S(25-50 keV) vs. S(50-100 keV) plot 
 
S(25-50 keV)  = 3.43e-07
S(50-100 keV) = 4.93e-07
 T90 vs. Hardness ratio plot 
 
T90                                   = 71.0199999809265 sec.
Hardness ratio (energy fluence ratio) = 1.43732
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 1.85818
Count Ratio (50-100 keV) / (15-25 keV) = 1.38954
 Mask shadow pattern 
 
IMX = 3.229335019026143E-01, IMY = 6.522179006549594E-01
 TIME vs. PHA plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 72.000000
 TIME vs. DetID plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 72.000000
 100 us light curve (15-350 keV)
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 72.000000
 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:
-239.000000 4.420000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9919 -15.6350    0.4  24.8  -73.2   9.8777  32.5    0.8	Sco X-1                       
254.3758  35.2345    5.8  57.6   -5.5   2.6508   2.0    7.6	Her X-1                       
255.9831 -37.8446    0.3  21.7 -137.0  10.0332  41.0    0.2	4U 1700-377                   
256.2726 -36.2811   36.4  20.4 -134.7   0.0747   0.3   11.6	GX 349+2                      
263.0478 -24.7931   11.7   8.3 -114.0   0.2276   1.0    3.6	GX 1+4                        
264.9683 -44.5840    0.0  24.8 -160.1   0.1218   0.5   12.6	4U 1735-44                    
268.3804  -1.5138    4.1  18.9    3.3   0.6556   2.8    3.7	SW J1753.5-0127               
270.2865 -25.0413    2.4   4.8 -166.0   1.0366   4.7    2.3	GX 5-1                        
270.2052 -25.7159    7.9   5.5 -165.7   0.3212   1.5    5.5	GRS 1758-258                  
273.9080 -14.0526    3.7   7.0   37.5   0.7172   3.2    5.8	GX 17+2                       
275.8761 -30.2496    6.7  11.0  165.9   0.3857   1.7    7.5	H1820-303                     
284.9699 -25.0891    7.9  14.1  122.9   0.3344   1.5   10.7	HT1900.1-2455                 
288.8131  10.9489    1.3  36.0   41.7   3.9474   8.7    0.9	GRS 1915+105                  
263.1889 -33.9669    0.0  15.2 -145.6   0.2957   1.4   12.7	GX 354-0                      
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
4.420000 82.700600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
245.1329 -15.5553    5.9  24.7  -72.9  -0.2755  -2.0   10.2	Sco X-1                       
254.4616  35.4128    3.6  57.8   -5.3   1.9908   3.2    4.2	Her X-1                       
256.0193 -37.9116    2.5  21.7 -137.2   0.5192   4.6    4.3	4U 1700-377                   
256.4486 -36.4203    4.6  20.4 -135.2   0.2827   2.5    0.7	GX 349+2                      
263.1650 -24.6753    4.4   8.2 -113.7   0.2855   2.6    9.5	GX 1+4                        
264.9683 -44.5840    0.0  24.8 -160.1  -0.2232  -1.9   12.6	4U 1735-44                    
268.2442  -1.5683   43.8  18.8    2.8  -0.0285  -0.3   10.2	SW J1753.5-0127               
270.4105 -25.0334   11.8   4.8 -167.4  -0.1089  -1.0    7.4	GX 5-1                        
270.4953 -25.8644    0.0   5.6 -168.5   0.0489   0.4   12.7	GRS 1758-258                  
273.9409 -14.2010    5.3   6.8   38.3  -0.2215  -2.2   10.6	GX 17+2                       
276.1006 -30.3707    5.5  11.2  165.3  -0.2180  -2.1    9.1	H1820-303                     
285.1839 -24.8468    4.6  14.2  121.8   0.2760   2.5    9.2	HT1900.1-2455                 
288.8812  10.8548    3.6  35.9   41.9   0.6059   3.3    7.3	GRS 1915+105                  
262.7931 -33.7233    7.3  15.1 -144.0  -0.1711  -1.6   11.8	GX 354-0                      
259.9685 -30.3088    2.6  13.9 -128.1   0.4902   4.5 ------	UNKNOWN                       
235.8799  -7.2988    1.2  36.0  -63.7   2.0269   9.6 ------	UNKNOWN                       
237.1587  23.6038    3.0  54.7  -28.0   1.7362   3.9 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
140.300620 317.700640
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9802 -15.6356    0.3  12.2  121.3   7.0229  41.3    0.3	Sco X-1                       
254.4362  35.3569    2.2  46.1    8.4   1.8784   5.2    1.4	Her X-1                       
255.9744 -37.8582    0.6  35.5  139.6   6.2465  19.4    1.0	4U 1700-377                   
256.6068 -36.3633    4.4  34.7  137.3   0.8321   2.6    9.0	GX 349+2                      
262.9938 -24.6152    7.3  31.1  114.2   0.4785   1.6    7.9	GX 1+4                        
264.6891 -44.5252    5.5  44.8  138.2   1.3530   2.1    5.1	4U 1735-44                    
268.4622  -1.3461    4.7  33.0   68.5   0.8074   2.4    8.5	SW J1753.5-0127               
270.2484 -24.9569    6.2  37.2  109.7   0.8310   1.9    7.6	GX 5-1                        
270.4801 -25.6320   11.4  37.7  110.5  -0.4780  -1.0   11.7	GRS 1758-258                  
274.0056 -14.0362  609.1  38.0   90.8  -0.0117  -0.0    0.0	GX 17+2                       
263.1493 -33.8896   19.2  36.6  127.8  -0.2388  -0.6    8.6	GX 354-0                      
272.0099 -27.5569    2.7  39.7  112.5   2.6250   4.3 ------	UNKNOWN                       
243.4426  50.5060    2.3  58.2   -7.0   4.6057   5.0 ------	UNKNOWN                       
190.4369 -50.5870    3.9  57.3 -160.1   2.9897   3.0 ------	UNKNOWN                       
195.8653   1.1322    3.1  40.8  -92.4   3.3326   3.7 ------	UNKNOWN                       
Plot creation:
Thu Jun 11 22:48:59 EDT 2015