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Image
Pre-slew 15.0-350.0 keV image (Event data)
 
#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  291.4489    67.7042   0.0040    20.5684   -88.2754         6.2194634     47.831 TRIG_00451165                 
 
Foreground time interval of the image:
-16.912  71.613 (delta_t =  88.525 [sec])
Background time interval of the image:
-239.688 -16.912 (delta_t = 222.776 [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)
 
 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  -16.912 sec. to   86.308 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.04046     ( -0.0699787   0.0709526 )
Norm@50keV  : 3.64844E-03    ( -0.00014537   0.000144445 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.30 using 59 PHA bins.
# Reduced chi-squared =          1.005 for     57 degrees of freedom 
# Null hypothesis probability =   4.639713e-01
 
Photon flux (15-150 keV)    in 103.2 sec: 0.557701 ( -0.0207514  0.0208206 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.48086e-06 ( -1.30332e-07  1.30891e-07 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from  -16.912 sec. to   86.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.49752     ( -0.326246   0.302031 )
Epeak [keV] : 41.9165      ( -9.06014 6.99931 )
Norm@50keV  : 7.09712E-03    ( -0.00215706   0.00344701 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.35 using 59 PHA bins.
# Reduced chi-squared =         0.8455 for     56 degrees of freedom 
# Null hypothesis probability =   7.881714e-01
 
Photon flux (15-150 keV)    in 103.2 sec: 0.535895 ( -0.023592  0.023713 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.29623e-06 ( -1.61714e-07  1.63035e-07 ) ergs/cm2
 
Band function
 
Time interval is from  -16.912 sec. to   86.308 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.14391   ( -0.577513   1.24589 )
beta        : -2.32802    ( 2.32804   0.198243 )
Epeak [keV] : 38.1194      ( -8.41014 8.76689 )
Norm@50keV   : 1.18712E-02    ( -0.00618722   0.0804092 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.10 using 59 PHA bins.
# Reduced chi-squared =         0.8382 for     55 degrees of freedom 
# Null hypothesis probability =   7.980749e-01
 
Photon flux (15-150 keV)    in 103.2 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.31612e-06 ( -3.31539e-06  -1.59785e-07 ) ergs/cm2
 
Single BB
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 10.9023  (  )
R^2/D10^2   : 0.173688  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         179.56 using 59 PHA bins.
# Reduced chi-squared =         3.1501 for     57 degrees of freedom 
# Null hypothesis probability =   1.315401e-14
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.443e-07   2.936e-08
25- 50  1.242e-06   4.747e-08
50-150  8.282e-07   7.678e-08
15-150  2.515e-06   9.959e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 67.8645       (-7.22798      8.61465)
Norm        : 2.69595       (-0.170405     0.184831)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.11 using 59 PHA bins.
# Reduced chi-squared =         0.8440 for     57 degrees of freedom 
# Null hypothesis probability =   7.930191e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.113e-07   3.865e-08
25- 50  1.122e-06   3.922e-08
50-150  1.408e-06   1.187e-07
15-150  3.242e-06   1.290e-07
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.29614        (-0.858638      0.893715)
R1^2/D10^2  : 0.997923        (-0.360005      0.696663)
kT2 [keV]   : 19.4986        (-2.71755      4.00838)
R2^2/D10^2  : 1.27868E-02    (-0.00684616   0.0116236)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.01 using 59 PHA bins.
# Reduced chi-squared =         0.9637 for     55 degrees of freedom 
# Null hypothesis probability =   5.511936e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.771e-07   8.586e-08
25- 50  1.119e-06   1.016e-07
50-150  1.414e-06   2.465e-07
15-150  3.210e-06   3.540e-07
Peak spectrum fit
Power-law model
 
Time interval is from    4.732 sec. to    5.732 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.73248     ( -0.210717   0.220727 )
Norm@50keV  : 9.91937E-03    ( -0.00144132   0.00141378 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.04 using 59 PHA bins.
# Reduced chi-squared =          1.071 for     57 degrees of freedom 
# Null hypothesis probability =   3.329382e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.33271 ( -0.167503  0.167531 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.16313e-08 ( -1.36783e-08  1.3964e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from    4.732 sec. to    5.732 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.789953     ( -1.12906   0.876069 )
Epeak [keV] : 56.8367      ( -13.8585 121.509 )
Norm@50keV  : 3.31861E-02    ( -0.0331853   0.109088 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.60 using 59 PHA bins.
# Reduced chi-squared =          1.029 for     56 degrees of freedom 
# Null hypothesis probability =   4.159315e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.29363 ( -0.17133  0.17132 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.4481e-08 ( -1.46067e-08  1.53367e-08 ) ergs/cm2
 
Band function
 
Time interval is from    4.732 sec. to    5.732 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.789899   ( -0.51313   1.54679 )
beta        : -10.0000    ( 10   3.85469e-13 )
Epeak [keV] : 56.8256      ( -13.8633 122.245 )
Norm@50keV   : 3.31876E-02    ( -0.0331876   0.109208 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.60 using 59 PHA bins.
# Reduced chi-squared =          1.047 for     55 degrees of freedom 
# Null hypothesis probability =   3.793759e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.55864e-08 ( 0  0 ) ergs/cm2
 
Single BB
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 11.6834  (-1.61601  1.93316)
R^2/D10^2   : 0.366332  (-0.15748   0.265534)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.21 using 59 PHA bins.
# Reduced chi-squared =          1.162 for     57 degrees of freedom 
# Null hypothesis probability =   1.890176e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.055e-08   2.475e-09
25- 50  3.215e-08   5.200e-09
50-150  2.591e-08   7.950e-09
15-150  6.862e-08   1.175e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 108.455       (-39.5891      90.3062)
Norm        : 5.84526       (-0.884119     1.09784)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.40 using 59 PHA bins.
# Reduced chi-squared =          1.025 for     57 degrees of freedom 
# Null hypothesis probability =   4.238273e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.527e-08   2.470e-09
25- 50  2.682e-08   4.455e-09
50-150  4.545e-08   2.640e-08
15-150  8.754e-08   2.891e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.93610        (-3.93208      3.19993)
R1^2/D10^2  : 1.48974        (-0.980897      31.6773)
kT2 [keV]   : 20.2416        (-7.34096      25.3034)
R2^2/D10^2  : 3.32919E-02    (-0.0313504   0.196439)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.81 using 59 PHA bins.
# Reduced chi-squared =          1.051 for     55 degrees of freedom 
# Null hypothesis probability =   3.719176e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.402e-08   8.110e-09
25- 50  2.848e-08   1.492e-08
50-150  4.243e-08   2.314e-08
15-150  8.493e-08   4.395e-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: 2.02451     ( -0.0704989   0.0714769 )
Norm@50keV  : 3.95628E-03    ( -0.000157758   0.000156756 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.70 using 59 PHA bins.
# Reduced chi-squared =         0.9772 for     57 degrees of freedom 
# Null hypothesis probability =   5.239216e-01
 
Photon flux (15-150 keV)    in 88.52 sec: 0.600232 ( -0.0224771  0.0225537 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.23419e-06 ( -1.21906e-07  1.22388e-07 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.55083     ( -0.316787   0.294288 )
Epeak [keV] : 43.4023      ( -10.4851 8.60047 )
Norm@50keV  : 7.04071E-03    ( -0.00207827   0.00326333 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.83 using 59 PHA bins.
# Reduced chi-squared =         0.8542 for     56 degrees of freedom 
# Null hypothesis probability =   7.729913e-01
 
Photon flux (15-150 keV)    in 88.52 sec: 0.579423 ( -0.025488  0.025586 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.08539e-06 ( -1.50112e-07  1.51033e-07 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.55100   ( -0.258195   0.333693 )
beta        : -10.00000    ( 10   20 )
Epeak [keV] : 43.3962      ( -10.4849 8.59661 )
Norm@50keV   : 7.03771E-03    ( -0.00207721   0.00324669 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.83 using 59 PHA bins.
# Reduced chi-squared =         0.8697 for     55 degrees of freedom 
# Null hypothesis probability =   7.424832e-01
 
Photon flux (15-150 keV)    in 88.52 sec: 0.577800 ( 6.4222  -0.028491 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.10277e-06 ( 0  0 ) ergs/cm2
 
 S(25-50 keV) vs. S(50-100 keV) plot 
 
S(25-50 keV)  = 1.06e-06
S(50-100 keV) = 1.03e-06
 T90 vs. Hardness ratio plot 
 
T90                                   = 79.3999999761581 sec.
Hardness ratio (energy fluence ratio) = 0.971698
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 1.10773
Count Ratio (50-100 keV) / (15-25 keV) = 0.516445
 Mask shadow pattern 
 
IMX = 1.129350651745802E-02, IMY = 3.750767460257233E-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:
-239.688000 -16.912000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4473  35.2616   14.8  22.4   40.6  -0.1594  -0.8    4.9	Her X-1                       
288.7683  10.9500    3.9  54.7    0.4   2.0101   2.9    1.8	GRS 1915+105                  
299.5295  35.1884    3.1  38.9  -28.7   0.9909   3.6    3.1	Cyg X-1                       
308.1612  40.9463    3.1  39.3  -42.8   1.0959   3.7    2.3	Cyg X-3                       
250.4528  47.2924    2.9  10.3   50.5   0.6499   4.0 ------	UNKNOWN                       
288.7285  13.9804    2.5  51.9   -1.1   2.0878   4.5 ------	UNKNOWN                       
143.5470  50.3880    2.4  56.9 -179.0   5.0512   4.8 ------	UNKNOWN                       
260.5675  57.0773    3.7   5.1  -41.0   0.5194   3.1 ------	UNKNOWN                       
 97.2209  65.6600    5.1  55.2 -145.2   3.0170   2.3 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
-16.912000 71.612620
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4932  35.5111  154.0  22.2   40.5  -0.0102  -0.1   10.3	Her X-1                       
288.7329  10.8773   18.1  54.7    0.5   0.3267   0.6    5.6	GRS 1915+105                  
299.4263  35.3075    6.9  38.8  -28.7  -0.3038  -1.7   10.2	Cyg X-1                       
307.9224  40.8471   10.5  39.2  -42.5   0.2193   1.1   10.6	Cyg X-3                       
183.0235  36.5402    2.3  48.5  142.7   2.7107   5.1 ------	UNKNOWN                       
281.1123  23.9714    2.5  39.8    2.2   0.8449   4.5 ------	UNKNOWN                       
291.4488  67.7042    0.2  20.6  -88.3   6.2196  47.8 ------	UNKNOWN                       
320.5872  65.5945    2.1  32.1  -85.9   1.0554   5.5 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
115.612580 962.416100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4614  35.3097   20.6  38.5   54.0  -0.6251  -0.6    2.0	Her X-1                       
299.5658  35.2064    1.1  32.8  -10.3   5.3631  10.2    1.2	Cyg X-1                       
308.1146  40.9417    1.0  28.3  -25.2   5.1288  11.0    0.7	Cyg X-3                       
326.0633  38.4470    4.9  35.0  -49.0   1.5056   2.3    9.1	Cyg X-2                       
119.2565  57.9702    3.9  54.2  176.9   5.6574   2.9 ------	UNKNOWN                       
308.0714  37.5997    2.3  31.5  -23.7   2.4078   5.0 ------	UNKNOWN                       
Plot creation:
Sat May 30 22:33:35 EDT 2015