Click here for the BAT GCN circular template 
Image
Pre-slew 15.0-350.0 keV image (Event data)
 
#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   48.2853   -65.9900   0.0087    25.1184     2.6194         1.1231964     22.181 TRIG_00436094                 
 
Foreground time interval of the image:
 -0.380  18.701 (delta_t =  19.081 [sec])
Background time interval of the image:
-239.600  -0.380 (delta_t = 239.220 [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   -0.380 sec. to   87.072 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.23418     ( -0.143858   0.142007 )
Norm@50keV  : 1.56571E-03    ( -0.000116875   0.000116875 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.87 using 59 PHA bins.
# Reduced chi-squared =         0.9100 for     57 degrees of freedom 
# Null hypothesis probability =   6.673021e-01
 
Photon flux (15-150 keV)    in 87.45 sec: 0.184715 ( -0.0143461  0.0144015 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.3761e-06 ( -1.15203e-07  1.15931e-07 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   -0.380 sec. to   87.072 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.22645     ( -0.143756   0.14642 )
Epeak [keV] : 9999.35      ( -9999.36 -9999.36 )
Norm@50keV  : 1.57274E-03    ( -0.000414585   0.000414588 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.92 using 59 PHA bins.
# Reduced chi-squared =         0.9272 for     56 degrees of freedom 
# Null hypothesis probability =   6.299887e-01
 
Photon flux (15-150 keV)    in 87.45 sec: 0.185083 ( -0.014858  0.014022 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.37699e-06 ( -1.15058e-07  1.09155e-07 ) ergs/cm2
 
Band function
 
Time interval is from   -0.380 sec. to   87.072 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.997033   ( 0.997033   0.997033 )
beta        : -1.23416    ( 1.23416   0.143837 )
Epeak [keV] : 44.6691      ( -44.6691 -44.6691 )
Norm@50keV   : 2.86958E-03    ( -0.00141998   0.225818 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.87 using 59 PHA bins.
# Reduced chi-squared =         0.9431 for     55 degrees of freedom 
# Null hypothesis probability =   5.948829e-01
 
Photon flux (15-150 keV)    in 87.45 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]    : 19.4482  (  )
R^2/D10^2   : 8.78227E-03  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         115.35 using 59 PHA bins.
# Reduced chi-squared =         2.0238 for     57 degrees of freedom 
# Null hypothesis probability =   7.758744e-06
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.661e-08   9.952e-09
25- 50  2.767e-07   3.769e-08
50-150  7.725e-07   1.125e-07
15-150  1.106e-06   1.202e-07
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 0.765610       (-0.0582279     0.0582209)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.38 using 59 PHA bins.
# Reduced chi-squared =          1.217 for     57 degrees of freedom 
# Null hypothesis probability =   1.257728e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.667e-07   1.596e-08
25- 50  3.207e-07   6.073e-08
50-150  7.032e-07   2.626e-07
15-150  1.191e-06   2.272e-07
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.90755        (-1.27522      1.45699)
R1^2/D10^2  : 0.129846        (-0.0569354      0.110296)
kT2 [keV]   : 45.4075        (-11.5185      27.057)
R2^2/D10^2  : 5.75878E-04    (-0.000382909   0.000728591)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.94 using 59 PHA bins.
# Reduced chi-squared =         0.8170 for     55 degrees of freedom 
# Null hypothesis probability =   8.316307e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.395e-07   3.487e-08
25- 50  3.045e-07   7.726e-08
50-150  1.009e-06   4.690e-07
15-150  1.453e-06   5.546e-07
Peak spectrum fit
Power-law model
 
Time interval is from   -0.224 sec. to    0.776 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.26971     ( -0.193715   0.192364 )
Norm@50keV  : 1.12958E-02    ( -0.00132048   0.00131826 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.71 using 59 PHA bins.
# Reduced chi-squared =         0.9949 for     57 degrees of freedom 
# Null hypothesis probability =   4.860121e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.34038 ( -0.157056  0.157193 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.12471e-07 ( -1.47759e-08  1.49587e-08 ) ergs/cm2
 
Cutoff power-law model
 
Time interval is from   -0.224 sec. to    0.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.501961     ( -1.06234   0.818017 )
Epeak [keV] : 95.2868      ( -31.8083 -95.3032 )
Norm@50keV  : 2.81722E-02    ( -0.0171978   0.0712612 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.20 using 59 PHA bins.
# Reduced chi-squared =         0.9678 for     56 degrees of freedom 
# Null hypothesis probability =   5.434173e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.30232 ( -0.16395  0.16306 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.04935e-07 ( -1.75157e-08  1.7278e-08 ) ergs/cm2
 
Band function
 
Time interval is from   -0.224 sec. to    0.776 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 2.64820   ( -4.49417   -3.88884 )
beta        : -1.65917    ( -0.401084   0.351111 )
Epeak [keV] : 40.7833      ( -10.1717 68.2938 )
Norm@50keV   : 3.14082    ( -3.13695   60.0434 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.92 using 59 PHA bins.
# Reduced chi-squared =         0.9259 for     55 degrees of freedom 
# Null hypothesis probability =   6.310874e-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]    : 15.3388  (-2.04449  2.52247)
R^2/D10^2   : 0.149242  (-0.060616   0.0946749)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.02 using 59 PHA bins.
# Reduced chi-squared =          1.088 for     57 degrees of freedom 
# Null hypothesis probability =   3.019308e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.323e-09   1.501e-09
25- 50  2.969e-08   5.875e-09
50-150  4.801e-08   1.080e-08
15-150  8.503e-08   1.321e-08
Thermal bremsstrahlung (OTTB)
 
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 5.50414       (-0.643608     0.643578)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.33 using 59 PHA bins.
# Reduced chi-squared =          1.058 for     57 degrees of freedom 
# Null hypothesis probability =   3.562611e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.371e-08   7.630e-09
25- 50  2.637e-08   1.455e-08
50-150  5.784e-08   3.191e-08
15-150  9.792e-08   5.345e-08
Double BB
 
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 10.7417        (-2.99223      2.97023)
R1^2/D10^2  : 0.376775        (-0.156207      0.346455)
kT2 [keV]   : 47.2831        (-37.5199      -63.1534)
R2^2/D10^2  : 2.42317E-03    (-0.000919521   0.0164439)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.35 using 59 PHA bins.
# Reduced chi-squared =         0.9154 for     55 degrees of freedom 
# Null hypothesis probability =   6.526707e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.654e-09   4.220e-09
25- 50  2.918e-08   1.320e-08
50-150  6.673e-08   3.665e-08
15-150  1.056e-07   5.053e-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: 1.14896     ( -0.135456   0.133404 )
Norm@50keV  : 3.74396E-03    ( -0.000275613   0.000275341 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.97 using 59 PHA bins.
# Reduced chi-squared =         0.7889 for     57 degrees of freedom 
# Null hypothesis probability =   8.757506e-01
 
Photon flux (15-150 keV)    in 19.08 sec: 0.436570 ( -0.0333504  0.0334484 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.3561e-07 ( -5.94621e-08  5.97666e-08 ) ergs/cm2
 
Cutoff power-law model
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.14419     ( -0.465276   0.200764 )
Epeak [keV] : 9997.76      (   )
Norm@50keV  : 3.76308E-03    ( -0.000275778   0.00272604 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.97 using 59 PHA bins.
# Reduced chi-squared =         0.8030 for     56 degrees of freedom 
# Null hypothesis probability =   8.545222e-01
 
Photon flux (15-150 keV)    in 19.08 sec: 0.436384 ( -0.03501  0.033406 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.37627e-07 ( -6.61313e-08  5.79116e-08 ) ergs/cm2
 
Band function
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.766116   ( 0.77085   5.65865 )
beta        : -1.18527    ( 1.18455   0.167116 )
Epeak [keV] : 115.932      ( -118.243 458.188 )
Norm@50keV   : 6.37880E-03    ( -0.0028003   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.83 using 59 PHA bins.
# Reduced chi-squared =         0.8151 for     55 degrees of freedom 
# Null hypothesis probability =   8.345711e-01
 
Photon flux (15-150 keV)    in 19.08 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)  = 2.95e-07
S(50-100 keV) = 5.01e-07
 T90 vs. Hardness ratio plot 
 
T90                                   = 70.891999900341 sec.
Hardness ratio (energy fluence ratio) = 1.69831
 Color vs. Color plot 
 
Count Ratio  (25-50 keV) / (15-25 keV) = 1.44699
Count Ratio (50-100 keV) / (15-25 keV) = 1.29189
 Mask shadow pattern 
 
IMX = 4.683360674006261E-01, IMY = -2.142568939790490E-02
 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:
-239.600000 -0.380000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5201 -40.5156    1.1  37.5 -112.4   4.4896  10.6    2.4	Vela X-1                      
 53.2018 -16.2062    3.0  40.4  102.2   2.8362   3.8 ------	UNKNOWN                       
 80.0402 -19.9951    2.3  28.5  143.8   1.1517   4.9 ------	UNKNOWN                       
 45.2319 -51.7653    2.5  24.2   37.3   0.9950   4.7 ------	UNKNOWN                       
328.3336 -68.0764    2.8  53.8   -5.6   2.2186   4.1 ------	UNKNOWN                       
183.7391 -73.3421    3.7  47.1  -53.1   3.0145   3.2 ------	UNKNOWN                       
 Pre-slew background subtracted image of 15-350 keV band 
Time interval of the image:
-0.380000 18.700580
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5232 -40.5720    7.3  37.5 -112.3  -0.1578  -1.6    1.1	Vela X-1                      
 93.8144  -7.0829    2.5  42.4  165.6   0.3825   4.7 ------	UNKNOWN                       
 48.2853 -65.9900    0.5  25.1    2.6   1.1232  22.2 ------	UNKNOWN                       
115.7693  -4.8611    2.0  51.7 -167.0   0.6883   5.8 ------	UNKNOWN                       
 Post-slew image of 15-350 keV band 
Time interval of the image:
64.900620 962.483400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
311.9089 -56.6581    3.3  42.4   -3.6   2.7820   3.5 ------	UNKNOWN                       
 19.3936 -73.3889    2.9  12.3  -17.1   1.9552   4.0 ------	UNKNOWN                       
293.6082 -51.8718    2.8  52.1  -12.4   5.2328   4.1 ------	UNKNOWN                       
133.8233 -45.1504    2.6  47.9 -129.0  10.2366   4.5 ------	UNKNOWN                       
Plot creation:
Sat May 30 23:42:28 EDT 2015