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Image
Pre-slew 15.0-350.0 keV image (Event data)
 
#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  241.6070   -39.3222   0.0143    10.8068     2.0572         0.9263590     13.459 TRIG_00518792                 
 
Foreground time interval of the image:
-17.260  20.548 (delta_t =  37.808 [sec])
Background time interval of the image:
-239.072 -17.260 (delta_t = 221.812 [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 1.408000
 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 1.408000
 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 1.408000
 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  -17.260 sec. to   20.548 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.86726     ( -0.193913   0.200155 )
Norm@50keV  : 1.36853E-03    ( -0.000173906   0.000171089 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          77.14 using 59 PHA bins.
# Reduced chi-squared =          1.353 for     57 degrees of freedom 
# Null hypothesis probability =   3.902349e-02
 
Photon flux (15-150 keV)    in 37.81 sec: 0.193725 ( -0.0212205  0.0212424 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.75699e-07 ( -5.95647e-08  6.07622e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from  -17.260 sec. to   20.548 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.882136     ( -1.16598   0.90846 )
Epeak [keV] : 46.5847      ( -10.3295 60.6847 )
Norm@50keV  : 5.09807E-03    ( -0.00509991   0.0197133 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.70 using 59 PHA bins.
# Reduced chi-squared =          1.316 for     56 degrees of freedom 
# Null hypothesis probability =   5.657957e-02
 
Photon flux (15-150 keV)    in 37.81 sec: 0.185561 ( -0.022359  0.022457 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.24852e-07 ( -6.81185e-08  7.49394e-08 ) ergs/cm2
 
Band function
 
Time interval is from  -17.260 sec. to   20.548 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 2.43038   ( -2.34218   -1.12305 )
beta        : -2.31902    ( -0.501709   0.371971 )
Epeak [keV] : 31.4253      ( -7.81334 9.04143 )
Norm@50keV   : 1.06284    ( -1.0618   30.8048 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.16 using 59 PHA bins.
# Reduced chi-squared =          1.276 for     55 degrees of freedom 
# Null hypothesis probability =   8.183136e-02
 
Photon flux (15-150 keV)    in 37.81 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.39288e-07 ( -4.39023e-07  -6.28395e-08 ) ergs/cm2
 
Single BB
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 10.2976  (-1.23248  1.44092)
R^2/D10^2   : 8.15991E-02  (-0.0323705   0.0519733)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          83.28 using 59 PHA bins.
# Reduced chi-squared =          1.461 for     57 degrees of freedom 
# Null hypothesis probability =   1.316855e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.726e-08   1.208e-08
25- 50  1.742e-07   2.486e-08
50-150  9.891e-08   2.781e-08
15-150  3.404e-07   4.722e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 78.8546       (-23.5226      43.9085)
Norm        : 0.916843       (-0.145834     0.181444)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          74.14 using 59 PHA bins.
# Reduced chi-squared =          1.301 for     57 degrees of freedom 
# Null hypothesis probability =   6.318798e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.987e-08   1.512e-08
25- 50  1.474e-07   1.849e-08
50-150  2.061e-07   8.785e-08
15-150  4.434e-07   9.161e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.22600        (-1.89389      2.27523)
R1^2/D10^2  : 0.233754        (-0.131598      0.223205)
kT2 [keV]   : 23.1230        (-8.97846      -23.5215)
R2^2/D10^2  : 2.22660E-03    (-0.00208367   0.013781)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.06 using 59 PHA bins.
# Reduced chi-squared =          1.292 for     55 degrees of freedom 
# Null hypothesis probability =   7.141485e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.467e-08   3.962e-08
25- 50  1.557e-07   7.719e-08
50-150  1.975e-07   1.153e-07
15-150  4.378e-07   2.070e-07
Peak spectrum fit
Power-law model
 
Time interval is from    0.108 sec. to    1.108 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.40239     ( -0.326036   0.325935 )
Norm@50keV  : 6.05572E-03    ( -0.00107514   0.001071 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.13 using 59 PHA bins.
# Reduced chi-squared =          1.107 for     57 degrees of freedom 
# Null hypothesis probability =   2.688608e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.737878 ( -0.134173  0.134996 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.8486e-08 ( -1.14103e-08  1.15863e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from    0.108 sec. to    1.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.28739     ( -1.22095   1.62487 )
Epeak [keV] : 330.440      ( -260.35 -260.35 )
Norm@50keV  : 6.86137E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.10 using 59 PHA bins.
# Reduced chi-squared =          1.127 for     56 degrees of freedom 
# Null hypothesis probability =   2.398023e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.733717 ( -0.141613  0.137531 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.81513e-08 ( -1.21544e-08  1.18382e-08 ) ergs/cm2
 
Band function
 
Time interval is from    0.108 sec. to    1.108 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.22380   ( -0.435344   0.9267 )
beta        : -9.37167    ( 9.37167   19.3717 )
Epeak [keV] : 240.093      ( -162.4 -240.409 )
Norm@50keV   : 7.32118E-03    ( -0.00229512   0.00917735 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.11 using 59 PHA bins.
# Reduced chi-squared =          1.147 for     55 degrees of freedom 
# Null hypothesis probability =   2.114787e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.729463 (    ) 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]    : 18.6629  (-4.05243  5.3027)
R^2/D10^2   : 3.96581E-02  (-0.0224148   0.0512557)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.36 using 59 PHA bins.
# Reduced chi-squared =          1.252 for     57 degrees of freedom 
# Null hypothesis probability =   9.559108e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.732e-09   9.980e-10
25- 50  1.298e-08   4.473e-09
50-150  3.309e-08   1.281e-08
15-150  4.880e-08   1.572e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (-84.6671      -199.363)
Norm        : 3.04617       (-0.537093     0.537093)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.95 using 59 PHA bins.
# Reduced chi-squared =          1.122 for     57 degrees of freedom 
# Null hypothesis probability =   2.455971e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.585e-09   4.458e-09
25- 50  1.459e-08   8.405e-09
50-150  3.200e-08   1.847e-08
15-150  5.418e-08   3.107e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.54232        (-2.30893      2.93509)
R1^2/D10^2  : 1.72174        (-1.42337      6.3707)
kT2 [keV]   : 26.0210        (-6.90589      14.2843)
R2^2/D10^2  : 1.14468E-02    (-0.0086822   0.0157869)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.02 using 59 PHA bins.
# Reduced chi-squared =          1.109 for     55 degrees of freedom 
# Null hypothesis probability =   2.685596e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.531e-09   4.292e-09
25- 50  1.281e-08   6.920e-09
50-150  3.837e-08   2.311e-08
15-150  5.871e-08   3.179e-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: 1.86726     ( -0.193913   0.200155 )
Norm@50keV  : 1.36853E-03    ( -0.000173906   0.000171089 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          77.14 using 59 PHA bins.
# Reduced chi-squared =          1.353 for     57 degrees of freedom 
# Null hypothesis probability =   3.902349e-02
 
Photon flux (15-150 keV)    in 37.81 sec: 0.193725 ( -0.0212205  0.0212424 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.75699e-07 ( -5.95647e-08  6.07622e-08 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.882136     ( -1.16598   0.90846 )
Epeak [keV] : 46.5847      ( -10.3295 60.6847 )
Norm@50keV  : 5.09807E-03    ( -0.00509991   0.0197133 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.70 using 59 PHA bins.
# Reduced chi-squared =          1.316 for     56 degrees of freedom 
# Null hypothesis probability =   5.657957e-02
 
Photon flux (15-150 keV)    in 37.81 sec: 0.185561 ( -0.022359  0.022457 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.24852e-07 ( -6.81185e-08  7.49394e-08 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 2.43038   ( -2.34218   -1.12305 )
beta        : -2.31902    ( -0.501709   0.371971 )
Epeak [keV] : 31.4253      ( -7.81334 9.04143 )
Norm@50keV   : 1.06284    ( -1.0618   30.8044 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.16 using 59 PHA bins.
# Reduced chi-squared =          1.276 for     55 degrees of freedom 
# Null hypothesis probability =   8.183136e-02
 
Photon flux (15-150 keV)    in 37.81 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.39288e-07 ( -4.39023e-07  -6.28395e-08 ) ergs/cm2
 
 S(25-50 keV) vs. S(50-100 keV) plot 
 
S(25-50 keV)  = 1.37e-07
S(50-100 keV) = 1.50e-07
 T90 vs. Hardness ratio plot 
 
T90                                   = 29.9279999732971 sec.
Hardness ratio (energy fluence ratio) = 1.09489
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 1.27571
Count Ratio (50-100 keV) / (15-25 keV) = 0.622109
 Mask shadow pattern 
 
IMX = 1.907596990060531E-01, IMY = -6.852290622875360E-03
 TIME vs. PHA plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.408000
 TIME vs. DetID plot around the trigger time 
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.408000
 100 us light curve (15-350 keV)
 
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.408000
 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:
-239.072000 -17.260000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
186.6123 -62.8088    3.1  50.6   10.6   2.4332   3.7    2.6	GX 301-2                      
244.9791 -15.6426    0.2  13.9  152.0  13.4082  65.0    0.1	Sco X-1                       
255.8547 -37.6637    0.0  11.1  -60.1   0.2268   1.0   12.5	4U 1700-377                   
256.4814 -36.4595    5.3  10.7  -66.6   0.4684   2.2    3.1	GX 349+2                      
263.0177 -24.7609  340.5  15.1 -124.5  -0.0069  -0.0    1.0	GX 1+4                        
264.6434 -44.5041    3.0  20.6  -58.4   0.8754   3.8    5.4	4U 1735-44                    
268.3856  -1.4906    2.4  34.6 -160.1   1.1704   4.8    2.5	SW J1753.5-0127               
270.1019 -25.1906    8.2  21.0 -116.3   0.3255   1.4   11.9	GX 5-1                        
270.1187 -25.8558    0.0  20.8 -114.5   0.0693   0.3   12.0	GRS 1758-258                  
273.9530 -14.0540    2.9  29.3 -136.0   1.0422   4.0    3.3	GX 17+2                       
275.8410 -30.4037    5.4  25.0 -100.8   0.5791   2.2    4.9	H1820-303                     
285.0306 -24.9214    9.8  34.1 -108.6   0.4828   1.2    0.3	HT1900.1-2455                 
262.8322 -33.7262  102.1  14.2  -88.6   0.0255   0.1   10.2	GX 354-0                      
195.2890 -32.9440    3.7  43.8   51.4   2.6047   3.1 ------	UNKNOWN                       
258.1284  22.6319    2.3  53.2  172.7   3.9677   4.9 ------	UNKNOWN                       
262.6453  25.7272    2.9  57.2  176.6   5.5396   4.0 ------	UNKNOWN                       
228.1285 -61.9010    2.8  34.7   -4.9   1.0474   4.1 ------	UNKNOWN                       
293.6411 -23.4427    3.1  42.0 -107.1   3.6061   3.8 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
-17.260000 20.548000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
186.7284 -62.7622    4.3  50.6   10.7  -0.5537  -2.7    2.0	GX 301-2                      
244.7792 -15.7276    0.0  13.8  151.2   0.1741   2.6   12.7	Sco X-1                       
256.1239 -37.9478    4.2  11.5  -59.8   0.2004   2.7    9.0	4U 1700-377                   
256.5666 -36.6034    0.0  10.8  -66.2  -0.1159  -1.6   12.5	GX 349+2                      
263.2010 -24.6376    0.0  15.3 -124.7   0.1080   1.5   12.3	GX 1+4                        
264.8601 -44.4827    5.6  20.7  -58.8   0.1604   2.0    5.4	4U 1735-44                    
268.3918  -1.6146   61.2  34.5 -160.0  -0.0164  -0.2    9.8	SW J1753.5-0127               
270.3213 -25.2171   12.6  21.2 -116.1   0.0733   0.9    8.5	GX 5-1                        
270.4661 -25.7601    7.3  21.2 -114.6  -0.1369  -1.7    8.9	GRS 1758-258                  
273.9199 -13.8703   18.7  29.4 -136.4  -0.0548  -0.6   11.2	GX 17+2                       
276.1096 -30.2484    0.0  25.3 -101.1   0.2762   3.1   11.9	H1820-303                     
285.1979 -24.8589    2.8  34.2 -108.6   0.5215   4.1    9.6	HT1900.1-2455                 
263.1396 -33.7123    6.0  14.5  -88.9   0.1386   1.9   10.5	GX 354-0                      
241.6070 -39.3221    0.9  10.8    2.1   0.9263  13.5 ------	UNKNOWN                       
291.1137  -1.1605    2.2  50.7 -135.9   1.8831   5.4 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
57.428640 864.128600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.2728 -60.5814   13.0  47.6   17.3   1.5232   0.9    2.8	Cen X-3                       
186.6179 -62.8101    1.6  39.9   13.9   7.4277   7.3    2.6	GX 301-2                      
244.9708 -15.6427    0.2  23.9  166.4  45.6315  66.8    0.5	Sco X-1                       
255.9722 -37.9818    8.1  11.3 -114.1   0.9262   1.4    8.3	4U 1700-377                   
256.2761 -36.3756    3.5  12.0 -121.5   2.0790   3.3    8.2	GX 349+2                      
262.8836 -24.8637    5.1  23.1 -144.3   1.4832   2.3    9.8	GX 1+4                        
264.6019 -44.4694    3.5  17.8  -87.6   2.2654   3.3    6.1	4U 1735-44                    
268.3771  -1.4245    7.3  45.1 -162.2   1.8305   1.6    1.8	SW J1753.5-0127               
270.3133 -24.9405    4.3  28.1 -133.9   2.2518   2.7    8.5	GX 5-1                        
270.4010 -25.6148    2.7  27.8 -132.7   3.5808   4.2    9.4	GRS 1758-258                  
273.9967 -13.9959    2.4  38.1 -144.3   4.5723   4.7    2.5	GX 17+2                       
275.8937 -30.2285    9.6  29.4 -119.1   1.0702   1.2    8.5	H1820-303                     
285.0360 -24.9213   72.1  39.1 -120.1   0.2115   0.2    0.0	HT1900.1-2455                 
262.9892 -33.9819   14.3  18.0 -122.4   0.4906   0.8    8.8	GX 354-0                      
187.6470 -52.1394    2.9  38.7   30.7   4.0904   4.0 ------	UNKNOWN                       
248.3487  13.4197    3.3  53.1  166.5  10.2023   3.5 ------	UNKNOWN                       
238.5809 -53.0299    2.8  13.8  -14.3   2.4100   4.2 ------	UNKNOWN                       
283.6358 -39.6233    3.0  32.2  -97.6   3.8331   3.9 ------	UNKNOWN                       
Plot creation:
Sat May 30 19:51:36 EDT 2015