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
  221.6239   -35.4635   0.0062    46.9040  -161.2942         5.3206865     30.952 TRIG_00648601                 
 
Foreground time interval of the image:
-34.060  12.373 (delta_t =  46.433 [sec])
Background time interval of the image:
-239.528 -34.060 (delta_t = 205.468 [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  -34.060 sec. to   70.236 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.77451     ( -0.0845965   0.0852805 )
Norm@50keV  : 4.44390E-03    ( -0.000212592   0.000212049 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.10 using 59 PHA bins.
# Reduced chi-squared =          1.247 for     57 degrees of freedom 
# Null hypothesis probability =   9.913289e-02
 
Photon flux (15-150 keV)    in 104.3 sec: 0.606415 ( -0.0307473  0.0308639 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.27145e-06 ( -2.08482e-07  2.08937e-07 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from  -34.060 sec. to   70.236 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.48251     ( -0.354599   0.321561 )
Epeak [keV] : 89.7930      ( -25.0478 -89.7935 )
Norm@50keV  : 6.20473E-03    ( -0.00184077   0.00301905 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.82 using 59 PHA bins.
# Reduced chi-squared =          1.229 for     56 degrees of freedom 
# Null hypothesis probability =   1.166938e-01
 
Photon flux (15-150 keV)    in 104.3 sec: 0.595383 ( -0.032943  0.03307 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.18869e-06 ( -2.3115e-07  2.29627e-07 ) ergs/cm2
 
Band function
 
Time interval is from  -34.060 sec. to   70.236 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.238405   ( -1.48849   0.670659 )
beta        : -1.88318    ( 1.88539   0.133162 )
Epeak [keV] : 34.3747      ( -18.1453 69.4753 )
Norm@50keV   : 9.44674E-02    ( -0.0937761   176.618 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.39 using 59 PHA bins.
# Reduced chi-squared =          1.207 for     55 degrees of freedom 
# Null hypothesis probability =   1.397194e-01
 
Photon flux (15-150 keV)    in 104.3 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.17372e-06 ( -4.17299e-06  -2.20668e-07 ) ergs/cm2
 
Single BB
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 13.5886  (  )
R^2/D10^2   : 8.93250E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         178.86 using 59 PHA bins.
# Reduced chi-squared =         3.1379 for     57 degrees of freedom 
# Null hypothesis probability =   1.677228e-14
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.642e-07   3.192e-08
25- 50  1.314e-06   7.666e-08
50-150  1.573e-06   1.418e-07
15-150  3.252e-06   1.768e-07
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 125.640       (-24.7707      26.492)
Norm        : 2.49204       (-0.152272     0.204029)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.83 using 59 PHA bins.
# Reduced chi-squared =          1.225 for     57 degrees of freedom 
# Null hypothesis probability =   1.183745e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.756e-07   5.898e-08
25- 50  1.218e-06   8.031e-08
50-150  2.223e-06   6.289e-07
15-150  4.117e-06   6.618e-07
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.07476        (-0.927365      1.01221)
R1^2/D10^2  : 0.694411        (-0.255934      0.455431)
kT2 [keV]   : 25.3524        (-3.68557      5.61962)
R2^2/D10^2  : 6.65295E-03    (-0.00347822   0.00563164)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.30 using 59 PHA bins.
# Reduced chi-squared =          1.224 for     55 degrees of freedom 
# Null hypothesis probability =   1.235101e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.657e-07   1.087e-07
25- 50  1.262e-06   1.444e-07
50-150  2.231e-06   3.885e-07
15-150  4.159e-06   6.967e-07
Peak spectrum fit
Power-law model
 
Time interval is from    1.980 sec. to    2.980 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.53799     ( -0.170255   0.171868 )
Norm@50keV  : 2.98442E-02    ( -0.0028582   0.0028521 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.63 using 59 PHA bins.
# Reduced chi-squared =         0.8006 for     57 degrees of freedom 
# Null hypothesis probability =   8.602464e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.76507 ( -0.380222  0.381532 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.81447e-07 ( -2.86952e-08  2.87927e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from    1.980 sec. to    2.980 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.54139     ( -0.176522   0.167672 )
Epeak [keV] : 9999.32      ( -9999.36 -9999.36 )
Norm@50keV  : 2.99103E-02    ( -0.0299138   0.0154125 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.65 using 59 PHA bins.
# Reduced chi-squared =         0.8151 for     56 degrees of freedom 
# Null hypothesis probability =   8.369332e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.77604 ( -0.20618  0.37041 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.80879e-07 ( -2.8163e-08  2.9026e-08 ) ergs/cm2
 
Band function
 
Time interval is from    1.980 sec. to    2.980 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.74399   ( -4.74399   -4.74399 )
beta        : -1.57005    ( -0.189131   0.180396 )
Epeak [keV] : 21.9581      ( -21.9581 7.32082 )
Norm@50keV   : 4537.20    ( -429.739   1.68834e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.33 using 59 PHA bins.
# Reduced chi-squared =         0.8241 for     55 degrees of freedom 
# Null hypothesis probability =   8.206961e-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]    : 15.9763  (-2.25669  2.6488)
R^2/D10^2   : 0.328627  (-0.136142   0.233271)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          89.52 using 59 PHA bins.
# Reduced chi-squared =          1.570 for     57 degrees of freedom 
# Null hypothesis probability =   3.844963e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.735e-08   3.685e-09
25- 50  7.291e-08   1.108e-08
50-150  1.300e-07   2.381e-08
15-150  2.203e-07   2.810e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-57.5291      -200)
Norm        : 15.3502       (-1.46024     1.46024)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.90 using 59 PHA bins.
# Reduced chi-squared =         0.8404 for     57 degrees of freedom 
# Null hypothesis probability =   7.992138e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.823e-08   5.000e-09
25- 50  7.354e-08   2.002e-08
50-150  1.613e-07   7.348e-08
15-150  2.731e-07   8.900e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.13285        (-1.54531      1.94125)
R1^2/D10^2  : 4.32981        (-2.48039      6.56112)
kT2 [keV]   : 35.0514        (-9.27432      24.0912)
R2^2/D10^2  : 1.83222E-02    (-0.0141009   0.0330115)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.12 using 59 PHA bins.
# Reduced chi-squared =         0.8022 for     55 degrees of freedom 
# Null hypothesis probability =   8.531795e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.926e-08   1.442e-08
25- 50  7.205e-08   2.514e-08
50-150  1.764e-07   8.528e-08
15-150  2.878e-07   1.016e-07
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: 1.68527     ( -0.0854499   0.0858813 )
Norm@50keV  : 7.79499E-03    ( -0.000370186   0.000369547 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.89 using 59 PHA bins.
# Reduced chi-squared =         0.9805 for     57 degrees of freedom 
# Null hypothesis probability =   5.169321e-01
 
Photon flux (15-150 keV)    in 46.43 sec: 1.02999 ( -0.0534741  0.0537026 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.35501e-06 ( -1.64339e-07  1.64618e-07 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.50378     ( -0.348284   0.248218 )
Epeak [keV] : 144.353      (   )
Norm@50keV  : 9.52809E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.00 using 59 PHA bins.
# Reduced chi-squared =         0.9821 for     56 degrees of freedom 
# Null hypothesis probability =   5.128023e-01
 
Photon flux (15-150 keV)    in 46.43 sec: 1.01793 ( -0.057288  0.05756 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.32e-06 ( -1.78138e-07  1.76991e-07 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.685464   ( 0.800234   5.44041 )
beta        : -1.76712    ( 1.76728   0.128416 )
Epeak [keV] : 45.3382      ( -45.3003 284.894 )
Norm@50keV   : 3.23739E-02    ( -0.0327043   2863.58 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.80 using 59 PHA bins.
# Reduced chi-squared =         0.9782 for     55 degrees of freedom 
# Null hypothesis probability =   5.204822e-01
 
Photon flux (15-150 keV)    in 46.43 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.30268e-06 ( 0  0 ) ergs/cm2
 
 S(25-50 keV) vs. S(50-100 keV) plot 
 
S(25-50 keV)  = 1.19e-06
S(50-100 keV) = 1.39e-06
 T90 vs. Hardness ratio plot 
 
T90                                   = 70.9559999108315 sec.
Hardness ratio (energy fluence ratio) = 1.16807
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 1.42225
Count Ratio (50-100 keV) / (15-25 keV) = 0.937082
 Mask shadow pattern 
 
IMX = -1.012317140710808E+00, IMY = 3.427650886563163E-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:
-239.528000 -34.060000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9902 -15.6599    0.4  25.9 -126.4   6.2080  28.6    1.3	Sco X-1                       
255.9866 -37.8441   56.1  23.1  173.2  -0.0410  -0.2    0.0	4U 1700-377                   
256.4354 -36.4231    2.5  21.8  175.0   0.8555   4.6    0.0	GX 349+2                      
262.9160 -24.7917    5.2   9.9 -164.9   0.4090   2.2    5.8	GX 1+4                        
264.7709 -44.4361    5.8  25.7  151.4   0.4383   2.0    1.5	4U 1735-44                    
268.4319  -1.3169    4.2  18.4  -51.6   0.4922   2.7    9.0	SW J1753.5-0127               
270.1014 -25.1338    6.8   6.0  155.8   0.3241   1.7   10.5	GX 5-1                        
270.2710 -25.6802    4.3   6.5  153.1   0.5477   3.0    4.1	GRS 1758-258                  
274.0571 -14.0352    3.4   5.7  -19.5   0.6067   3.4    3.0	GX 17+2                       
275.9195 -30.3454    2.6  11.5  122.1   0.7830   4.4    1.3	H1820-303                     
284.8993 -25.0113    6.6  13.2   77.0  -0.3585  -1.7    9.2	HT1900.1-2455                 
288.7965  10.9452  120.9  34.6  -10.4  -0.0214  -0.1    0.1	GRS 1915+105                  
262.9380 -33.8203   12.6  16.5  166.8   0.1572   0.9    2.7	GX 354-0                      
238.1211 -62.9364    2.5  49.3  159.1   2.7350   4.7 ------	UNKNOWN                       
309.6726  21.8633    2.4  55.3    3.2   3.8905   4.7 ------	UNKNOWN                       
238.1680   4.5671    3.9  41.0  -98.1   2.9234   3.0 ------	UNKNOWN                       
222.4224 -12.0337    3.6  48.1 -129.3   2.5910   3.2 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
-34.060000 12.372620
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9906 -15.4277    0.0  26.0 -125.9   0.0391   0.4   12.8	Sco X-1                       
255.9037 -37.7179    7.0  23.0  173.5  -0.1477  -1.6    8.5	4U 1700-377                   
256.5478 -36.2999    9.0  21.6  175.0  -0.1135  -1.3    9.2	GX 349+2                      
263.1646 -24.8117   23.5   9.8 -165.6  -0.0382  -0.5    9.4	GX 1+4                        
264.9677 -44.4898   12.2  25.8  151.1  -0.0899  -0.9    9.9	4U 1735-44                    
268.3503  -1.3357    8.3  18.4  -51.9   0.1171   1.4    7.1	SW J1753.5-0127               
270.2689 -25.0085   11.0   5.8  154.7   0.0847   1.1    4.3	GX 5-1                        
270.2296 -25.5916   12.4   6.4  153.6   0.0815   1.0    9.9	GRS 1758-258                  
273.9218 -14.1636   17.2   5.6  -20.3  -0.0501  -0.7    9.1	GX 17+2                       
275.7576 -30.4414   20.5  11.6  123.0   0.0457   0.6    9.7	H1820-303                     
285.0479 -24.9083    6.0  13.3   76.3   0.1671   1.9    1.0	HT1900.1-2455                 
288.7018  10.9405   19.9  34.5  -10.5  -0.0561  -0.6    5.7	GRS 1915+105                  
263.2416 -33.8289    0.0  16.4  166.0  -0.1074  -1.4   12.6	GX 354-0                      
303.8030 -50.9623    2.6  40.3  108.6   1.4015   4.4 ------	UNKNOWN                       
224.2891 -47.7894    2.5  47.7 -178.3   0.7976   4.7 ------	UNKNOWN                       
221.6239 -35.4635    0.4  46.9 -161.3   5.3209  31.0 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
94.972590 907.972590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.2007 -60.6516    7.5  41.0 -151.6   1.6969   1.5    3.8	Cen X-3                       
186.8587 -62.8617    3.7  34.8 -160.2   2.4273   3.1    7.8	GX 301-2                      
244.9706 -15.6329    0.4  28.8   45.1  26.2077  32.7    0.7	Sco X-1                       
256.0625 -37.6908    5.8  27.6   97.6  -1.8930  -2.0    9.9	4U 1700-377                   
256.4810 -36.5162    7.5  28.1   95.2   1.5594   1.5    6.0	GX 349+2                      
263.1442 -24.7948    4.6  37.2   77.7   4.6697   2.5    7.9	GX 1+4                        
264.6214 -44.3489    9.7  33.8  111.3  -1.4902  -1.2    8.0	4U 1735-44                    
262.9928 -33.8294   58.1  33.8   92.2   0.2747   0.2    0.4	GX 354-0                      
233.1349 -41.8381    2.8  11.0  121.6   2.2733   4.1 ------	UNKNOWN                       
233.0246 -13.8436    2.6  23.9   20.9   2.6616   4.4 ------	UNKNOWN                       
209.5819 -64.7240    1.0  30.2 -177.1   7.5358  11.6 ------	UNKNOWN                       
224.1541   6.8484    3.1  42.4   -3.6   3.7220   3.7 ------	UNKNOWN                       
222.8213  -2.8596    2.6  32.6   -5.1   3.2215   4.5 ------	UNKNOWN                       
158.3137 -44.9704    4.2  48.0 -129.1   9.0970   2.8 ------	UNKNOWN                       
Plot creation:
Sat Aug  8 00:35:59 EDT 2015