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
  203.9663   -18.3208   0.0061    25.2125  -122.2900         2.8083513     31.318 TRIG_00650530                 
 
Foreground time interval of the image:
 -8.696  19.157 (delta_t =  27.853 [sec])
Background time interval of the image:
-105.843  -8.696 (delta_t =  97.147 [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   -8.696 sec. to   95.944 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.13200     ( -0.0751098   0.0746462 )
Norm@50keV  : 3.33701E-03    ( -0.000133808   0.000133767 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.04 using 59 PHA bins.
# Reduced chi-squared =          1.246 for     57 degrees of freedom 
# Null hypothesis probability =   9.993074e-02
 
Photon flux (15-150 keV)    in 104.6 sec: 0.388362 ( -0.0161778  0.016204 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.61298e-06 ( -1.59795e-07  1.60426e-07 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   -8.696 sec. to   95.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.777190     ( -0.317993   0.295611 )
Epeak [keV] : 194.567      ( -65.6535 572.434 )
Norm@50keV  : 4.80440E-03    ( -0.00122957   0.00177959 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.79 using 59 PHA bins.
# Reduced chi-squared =          1.193 for     56 degrees of freedom 
# Null hypothesis probability =   1.532620e-01
 
Photon flux (15-150 keV)    in 104.6 sec: 0.380010 ( -0.017533  0.017537 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.52965e-06 ( -1.76638e-07  1.75885e-07 ) ergs/cm2
 
Band function
 
Time interval is from   -8.696 sec. to   95.944 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.777417   ( -0.267878   0.13668 )
beta        : -10.00000    ( 10   2.65157e-11 )
Epeak [keV] : 194.630      ( -75.9598 572.008 )
Norm@50keV   : 4.80303E-03    ( -0.00122795   0.00178132 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.79 using 59 PHA bins.
# Reduced chi-squared =          1.214 for     55 degrees of freedom 
# Null hypothesis probability =   1.324273e-01
 
Photon flux (15-150 keV)    in 104.6 sec: 0.382044 (    ) 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]    : 20.5072  (  )
R^2/D10^2   : 1.64947E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         148.48 using 59 PHA bins.
# Reduced chi-squared =         2.6049 for     57 degrees of freedom 
# Null hypothesis probability =   4.341326e-10
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.385e-07   1.093e-08
25- 50  7.011e-07   4.765e-08
50-150  2.193e-06   1.506e-07
15-150  3.032e-06   1.454e-07
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (      )
Norm        : 1.61775       (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         156.35 using 59 PHA bins.
# Reduced chi-squared =         2.7429 for     57 degrees of freedom 
# Null hypothesis probability =   3.422039e-11
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.214e-07   1.935e-08
25- 50  8.106e-07   3.823e-08
50-150  1.778e-06   7.950e-08
15-150  3.010e-06   1.271e-07
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.69777        (-1.10849      1.33218)
R1^2/D10^2  : 0.315913        (-0.145008      0.29719)
kT2 [keV]   : 27.8601        (-2.71936      3.71751)
R2^2/D10^2  : 5.49300E-03    (-0.00188253   0.00228249)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.16 using 59 PHA bins.
# Reduced chi-squared =          1.130 for     55 degrees of freedom 
# Null hypothesis probability =   2.362306e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.999e-07   6.093e-08
25- 50  7.207e-07   9.754e-08
50-150  2.491e-06   2.469e-07
15-150  3.511e-06   3.373e-07
Peak spectrum fit
Power-law model
 
Time interval is from    9.212 sec. to   10.212 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.982843     ( -0.326153   0.308872 )
Norm@50keV  : 9.00130E-03    ( -0.00153147   0.00151558 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.72 using 59 PHA bins.
# Reduced chi-squared =         0.9599 for     57 degrees of freedom 
# Null hypothesis probability =   5.612463e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.03546 ( -0.178222  0.179367 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.79192e-08 ( -1.76636e-08  1.78635e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from    9.212 sec. to   10.212 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.989197     ( -1.11637   0.303202 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 9.05861E-03    ( -0.00153287   0.0162988 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.72 using 59 PHA bins.
# Reduced chi-squared =         0.9772 for     56 degrees of freedom 
# Null hypothesis probability =   5.232560e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.03480 ( -0.180858  0.17803 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.77927e-08 ( -8.897e-09  1.78813e-08 ) ergs/cm2
 
Band function
 
Time interval is from    9.212 sec. to   10.212 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.836653   ( 0.836599   0.836599 )
beta        : -0.982841    ( 0.98284   0.326152 )
Epeak [keV] : 44.2711      ( -44.3466 -44.3466 )
Norm@50keV   : 1.43617E-02    ( -0.00684372   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.72 using 59 PHA bins.
# Reduced chi-squared =         0.9948 for     55 degrees of freedom 
# Null hypothesis probability =   4.854291e-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]    : 25.0938  (-5.46213  7.98556)
R^2/D10^2   : 2.43588E-02  (-0.0135728   0.0276289)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.16 using 59 PHA bins.
# Reduced chi-squared =          1.091 for     57 degrees of freedom 
# Null hypothesis probability =   2.974091e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.659e-09   1.170e-09
25- 50  1.512e-08   4.903e-09
50-150  7.054e-08   2.535e-08
15-150  8.832e-08   2.887e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-47.1041      -200)
Norm        : 4.24454       (-0.737123     0.737123)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.38 using 59 PHA bins.
# Reduced chi-squared =          1.129 for     57 degrees of freedom 
# Null hypothesis probability =   2.341312e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.057e-08   6.095e-09
25- 50  2.033e-08   1.151e-08
50-150  4.459e-08   2.569e-08
15-150  7.549e-08   4.392e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.20190        (-2.73659      4.40786)
R1^2/D10^2  : 1.24829        (-1.0673      12.9497)
kT2 [keV]   : 34.6257        (-10.0279      29.047)
R2^2/D10^2  : 8.51946E-03    (-0.00679371   0.00849505)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.13 using 59 PHA bins.
# Reduced chi-squared =         0.9661 for     55 degrees of freedom 
# Null hypothesis probability =   5.462248e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.137e-09   4.911e-09
25- 50  1.664e-08   9.285e-09
50-150  7.569e-08   4.137e-08
15-150  1.005e-07   5.115e-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: 0.813342     ( -0.0873756   0.0857913 )
Norm@50keV  : 6.53592E-03    ( -0.00031275   0.000310674 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.22 using 59 PHA bins.
# Reduced chi-squared =          1.214 for     57 degrees of freedom 
# Null hypothesis probability =   1.286442e-01
 
Photon flux (15-150 keV)    in 27.85 sec: 0.750859 ( -0.0350868  0.035203 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.11529e-06 ( -1.01024e-07  1.01366e-07 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.703925     ( -0.356664   0.141378 )
Epeak [keV] : 720.307      ( -754.454 -754.454 )
Norm@50keV  : 7.23223E-03    ( -0.00136246   0.00270025 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.94 using 59 PHA bins.
# Reduced chi-squared =          1.231 for     56 degrees of freedom 
# Null hypothesis probability =   1.148023e-01
 
Photon flux (15-150 keV)    in 27.85 sec: 0.746627 ( -0.03735  0.037326 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.1073e-06 ( -1.05805e-07  1.03237e-07 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.810002   ( 0.809929   0.809929 )
beta        : -0.813341    ( -0.0857414   0.0874478 )
Epeak [keV] : 16.8220      ( -16.8229 -16.8229 )
Norm@50keV   : 9.25156E-03    ( -0.00301684   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.22 using 59 PHA bins.
# Reduced chi-squared =          1.258 for     55 degrees of freedom 
# Null hypothesis probability =   9.407981e-02
 
Photon flux (15-150 keV)    in 27.85 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)  = 7.28e-07
S(50-100 keV) = 1.33e-06
 T90 vs. Hardness ratio plot 
 
T90                                   = 87.9559999704361 sec.
Hardness ratio (energy fluence ratio) = 1.82692
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 1.75985
Count Ratio (50-100 keV) / (15-25 keV) = 1.79283
 Mask shadow pattern 
 
IMX = -2.515194605134363E-01, IMY = 3.980184254623811E-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:
-105.843410 -8.696000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9935 -15.6395    0.5  17.7  105.1   3.6764  22.7    0.8	Sco X-1                       
254.5758  35.2704    6.0  50.9   19.7   0.8704   1.9    7.2	Her X-1                       
255.8979 -37.8333    3.0  38.1  135.2   1.1831   3.8    4.3	4U 1700-377                   
256.3739 -36.2976    6.2  37.4  132.9  -0.5780  -1.8    8.1	GX 349+2                      
262.9588 -24.6948    4.1  36.6  111.4   1.0351   2.8    4.1	GX 1+4                        
264.9226 -44.3937   20.7  47.5  136.3   0.3788   0.6    8.4	4U 1735-44                    
263.1241 -33.8455    9.3  40.5  124.7  -0.5899  -1.2    6.8	GX 354-0                      
263.1886 -19.4029    2.7  35.4  102.6   1.4861   4.3 ------	UNKNOWN                       
209.8136  31.5844    2.6  44.3  -30.8   1.0935   4.4 ------	UNKNOWN                       
191.8662  15.6170    3.2  43.6  -64.0   2.7289   3.6 ------	UNKNOWN                       
182.9748 -22.8376    2.9  45.4 -121.5   2.5888   3.9 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
-8.696000 19.156590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.8383 -15.4871    0.0  17.5  104.8   0.1773   2.0   12.3	Sco X-1                       
254.3318  35.3003    4.2  50.8   19.4   0.7263   2.7    6.7	Her X-1                       
256.1500 -37.8624    5.3  38.2  135.0   0.4000   2.2    7.8	4U 1700-377                   
256.4287 -36.3018    3.4  37.4  132.8   0.5761   3.4    7.3	GX 349+2                      
262.9433 -24.7344    4.3  36.6  111.4  -0.5181  -2.7    3.6	GX 1+4                        
264.7190 -44.3665    9.6  47.4  136.4   0.4313   1.2    5.1	4U 1735-44                    
262.9906 -33.8320 1529.3  40.4  124.7  -0.0019  -0.0    0.2	GX 354-0                      
223.1598 -56.2602    2.3  47.3  175.5   0.8293   5.0 ------	UNKNOWN                       
203.9663 -18.3208    0.4  25.2 -122.3   2.8083  31.3 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
66.156600 607.256610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.2872 -60.6043    3.2  48.6  179.3   3.7287   3.6    1.4	Cen X-3                       
186.8539 -62.7859    4.7  46.0  168.8   2.4104   2.4    5.5	GX 301-2                      
244.9982 -15.6645    1.3  39.2   70.4  16.1462   8.7    1.8	Sco X-1                       
233.9119 -63.1194    2.5  49.2  140.6   9.6611   4.6 ------	UNKNOWN                       
233.8643 -46.6319    2.5  37.4  123.7   5.3119   4.6 ------	UNKNOWN                       
211.2172 -27.0200    2.7  10.9  121.9   1.5829   4.3 ------	UNKNOWN                       
144.4702 -54.2375    4.1  57.6 -165.4   5.9252   2.8 ------	UNKNOWN                       
180.1259 -12.0423    2.9  23.9 -100.2   1.6581   4.0 ------	UNKNOWN                       
205.7712  37.1494    2.7  55.5  -20.4   5.5917   4.2 ------	UNKNOWN                       
155.9676 -19.3546    2.6  45.3 -121.4   9.0123   4.5 ------	UNKNOWN                       
152.5202 -24.6359    4.5  48.1 -129.1   5.4566   2.5 ------	UNKNOWN                       
Plot creation:
Sun Aug 30 19:07:03 EDT 2015