Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Tue Oct 31 19:11:58 EDT 2017
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger778154
======================================================================

  Trigger: 00778154      Segment: 000

  BAT Trigger Time: 529439587.008   [s; MET]
      Trigger Stop: 529439587.264   [s; MET]
               UTC: 2017-10-11T18:32:47.183100    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 236.760536734419   Dec: -10.0707462179219  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    14.59
     Image Trigger?:     NO
     Rate S/N Ratio:     40.8656334834051  [ if not an image trigger ]
     Image S/N Ratio:    14.59

  Analysis Position:   [ source = BAT ]
    RA: 236.760536734419   Dec: -10.0707462179219  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 236.765532099342   Dec: -10.0633833249001  [deg; J2000]  
        { 15h 47m 03.7s , -10d 03' 48.2" }
         +/- 0.916726226939317 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.229852577546126 [arcmin] (formal 1-sigma fit error)
    SNR: 34.4398878043931
 
  Angular difference between the analysis and refined position is 0.531274 arcmin
 
  Partial Coding Fraction: 0.6328125    [ including projection effects ]

  Duration
     T90: 2.27999991178513 +/- 0.232997893409871
        Measured from: 0.0600000023841858
                   to: 2.33999991416931     [s; relative to TRIGTIME]
     T50: 1.15199995040894 +/- 0.0990353384814221
        Measured from: 0.447999954223633
                   to: 1.59999990463257     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0479999780654907     
                   to: 1.04799997806549     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0600000023841858     
                   to: 2.74399995803833     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.577664   0.693614   0.441827   0.118325
           0.023005   0.025871   0.022787   0.023333 [error]
 Peak      0.230739   0.317645   0.243691   0.074928
           0.014177   0.016285   0.014750   0.014458 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    2.804   -0.060    2.744
T90     2.280    0.060    2.340
T50     1.152    0.448    1.600
Peak    1.000    0.048    1.048
 
 
====== Spectral Analysis Summary =====================================
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^{Ph_index}
Ph_90err   : 90% error of the photon index
Epeak      : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm       : normalization at 50 keV in both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedo
 
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.691    -0.085      0.084       -           -               -         4.10e-02     -1.95e-03          1.94e-03      45.420   57
CPL     -1.513    -0.244      0.352      128.870      N/A           N/A         5.08e-02        N/A               N/A         44.570   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.441     -0.100     0.099       -           -               -         5.66e-02     -3.28e-03          3.27e-03      54.360   57
CPL     -1.173     -0.314     0.413      150.964      N/A           N/A         7.78e-02        N/A               N/A         52.910   56
 
 
=== Fluence/Peak Flux Summary ===
 
              Model    Band1     Band2     Band3     Band4     Band5     Total
                       15-25     25-50    50-100    100-350    15-150    15-350    keV
Fluence         PL   1.76e-07  2.87e-07  3.56e-07  8.72e-07  1.06e-06  1.69e-06   erg/cm2
      90%_error_low -1.31e-08 -1.30e-08 -2.32e-08 -1.16e-07 -5.36e-08 -1.36e-07   erg/cm2
      90%_error_hi   1.34e-08  1.29e-08  2.32e-08  1.28e-07  5.40e-08  1.45e-07   erg/cm2
Peak flux       PL   2.20e+00  2.30e+00  1.69e+00  2.01e+00  6.96e+00  8.20e+00   ph/cm2/s
      90%_error_low -2.13e-01 -1.38e-01 -1.24e-01 -2.89e-01 -3.94e-01 -4.76e-01   ph/cm2/s
      90%_error_hi   2.19e-01  1.37e-01  1.24e-01  3.19e-01  3.95e-01  4.79e-01   ph/cm2/s
 
Fluence        CPL    N/A      N/A      N/A      N/A      N/A      N/A      erg/cm2
      90%_error_low -1.31e-08 -1.30e-08 -2.32e-08 -1.16e-07 -5.36e-08 -1.36e-07   erg/cm2
      90%_error_hi   1.34e-08  1.29e-08  2.32e-08  1.28e-07  5.40e-08  1.45e-07   erg/cm2
Peak flux      CPL   2.11e+00  2.36e+00  1.72e+00  1.43e+00  6.88e+00  7.62e+00   ph/cm2/s
      90%_error_low -2.51e-01 -1.61e-01 -1.34e-01 -5.29e-01 -4.13e-01 -6.86e-01   ph/cm2/s
      90%_error_hi   2.55e-01  1.66e-01  1.36e-01  6.85e-01  4.12e-01  8.51e-01   ph/cm2/s
 
======================================================================




Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  236.7655   -10.0634   0.0056    22.0490   -79.6233         1.8734966     34.440 TRIG_00778154                 
 
Foreground time interval of the image:
 -0.060   2.744 (delta_t =   2.804 [sec])
Background time interval of the image:
-59.507  -0.060 (delta_t =  59.447 [sec])




Light Curves

Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.

Full-time range; 1 s binning

Bokeh Plot

Other quick-look light curves:




Spectra

Notes:

Time averaged spectrum fit using the average DRM

Power-law model
Time interval is from   -0.060 sec. to    2.744 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.69137     ( -0.0845395   0.0837002 )
Norm@50keV  : 4.09619E-02    ( -0.00195253   0.00194134 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.42 using 59 PHA bins.
# Reduced chi-squared =         0.7968 for     57 degrees of freedom 
# Null hypothesis probability =   8.653946e-01
 
Photon flux (15-150 keV)    in 2.804 sec: 5.42411 ( -0.24583  0.24614 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.06433e-06 ( -5.35973e-08  5.3991e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.060 sec. to    2.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.51344     ( -0.244338   0.351947 )
Epeak [keV] : 128.870      (   )
Norm@50keV  : 5.08058E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.57 using 59 PHA bins.
# Reduced chi-squared =         0.7959 for     56 degrees of freedom 
# Null hypothesis probability =   8.642520e-01
 
Photon flux (15-150 keV)    in 2.804 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model
Time interval is from    0.048 sec. to    1.048 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.44114     ( -0.0999461   0.0994364 )
Norm@50keV  : 5.66195E-02    ( -0.0032812   0.0032696 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.36 using 59 PHA bins.
# Reduced chi-squared =         0.9537 for     57 degrees of freedom 
# Null hypothesis probability =   5.746744e-01
 
Photon flux (15-150 keV)    in 1 sec: 6.96252 ( -0.39448  0.39469 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.42763e-07 ( -3.52233e-08  3.55194e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.048 sec. to    1.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.17302     ( -0.314151   0.413183 )
Epeak [keV] : 150.964      (   )
Norm@50keV  : 7.78413E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.91 using 59 PHA bins.
# Reduced chi-squared =         0.9449 for     56 degrees of freedom 
# Null hypothesis probability =   5.924717e-01
 
Photon flux (15-150 keV)    in 1 sec: 6.87687 ( -0.41272  0.4122 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.29468e-07 ( -4.01513e-08  4.00271e-08 ) ergs/cm2
 

Time-resolved spectra




Distribution

T90 vs. Hardness ratio plot

T90                                   = 2.28 sec.
Hardness ratio (energy fluence ratio) = 1.23856796177

S(15-50 keV) vs. S(50-150 keV) plot

S(15-50 keV)  = 4.626511e-07
S(50-150 keV) = 6.016899e-07

The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.




Mask shadow pattern

IMX = 7.295171364331185E-02, IMY = 3.983962936016512E-01

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:
-59.507410 -0.060000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
245.0386 -15.6757    1.7  13.3  -94.7   2.6730   6.9    4.0	Sco X-1                       
254.3374  35.2688    8.3  50.4   -4.7   1.0633   1.4    7.4	Her X-1                       
256.0579 -37.8437    6.0  23.0 -174.4  -0.6746  -1.9    3.4	4U 1700-377                   
256.2845 -36.4037    4.8  21.5 -174.4   0.8434   2.4    7.4	GX 349+2                      
263.0815 -24.7679   16.4  10.6  158.4   0.2578   0.7    4.2	GX 1+4                        
264.7723 -44.3832    4.4  29.8  171.5  -1.1536  -2.6    4.2	4U 1735-44                    
268.5209  -1.5996    0.0  16.5   36.6  -0.1892  -0.5   12.7	SW J1753.5-0127               
270.1453 -24.9563    6.9  14.6  135.0   0.6665   1.7   10.6	GX 5-1                        
270.1968 -25.7136    6.1  15.1  137.0  -0.7248  -1.9    6.0	GRS 1758-258                  
274.1703 -14.1686    6.4  14.9   88.9  -0.7065  -1.8   12.4	GX 17+2                       
276.0092 -30.2087    9.1  21.9  136.9  -0.5197  -1.3   10.5	H1820-303                     
285.0263 -25.0628    4.0  26.6  116.5   1.4411   2.9    8.6	HT1900.1-2455                 
288.9384  10.9540   14.3  39.6   50.8   0.6318   0.8    8.3	GRS 1915+105                  
262.9818 -33.8256   11.5  19.2  169.5  -0.3705  -1.0    0.7	GX 354-0                      
293.0654  16.9803    3.2  46.5   48.0   4.8927   3.7 ------	UNKNOWN                       
281.9052 -19.0827    2.3  22.5  103.9   2.1574   5.1 ------	UNKNOWN                       
274.8650 -70.9542    2.5  56.8  173.9  11.0463   4.6 ------	UNKNOWN                       
251.4024 -18.2747    4.6   7.8 -115.9   0.8495   2.5 ------	UNKNOWN                       
251.6392  15.4626    2.4  31.3  -13.3   1.8159   4.8 ------	UNKNOWN                       
248.4134  20.6469    2.5  37.1  -16.2   2.2237   4.6 ------	UNKNOWN                       
242.3556  -8.6121    2.8  17.3  -70.2   1.6706   4.1 ------	UNKNOWN                       
	UNKNOWN                       

Pre-slew background subtracted image of 15-350 keV band

Time interval of the image:
-0.060000 2.744000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
245.0992 -15.5318    5.4  13.2  -94.1  -0.0923  -2.1    9.5	Sco X-1                       
254.3407  35.3580    5.5  50.5   -4.6   0.2016   2.1    5.8	Her X-1                       
256.0851 -37.6964    7.0  22.8 -174.4  -0.0727  -1.7   10.0	4U 1700-377                   
256.6076 -36.5387    5.5  21.6 -175.2  -0.0882  -2.1   10.8	GX 349+2                      
263.0005 -24.6300    8.5  10.4  158.4   0.0604   1.4    7.0	GX 1+4                        
264.8820 -44.5385    7.5  30.0  171.4  -0.0842  -1.5    8.0	4U 1735-44                    
268.5073  -1.3041    0.0  16.7   36.0   0.0268   0.6   12.2	SW J1753.5-0127               
270.4507 -25.1368   17.6  14.9  134.8  -0.0275  -0.7    9.7	GX 5-1                        
270.1360 -25.6946    6.2  15.1  137.1  -0.0811  -2.0    9.5	GRS 1758-258                  
274.1701 -14.1656   12.0  14.9   88.9  -0.0436  -1.0   12.3	GX 17+2                       
275.9341 -30.2490    8.3  21.9  137.1  -0.0704  -1.4    7.1	H1820-303                     
285.1197 -24.9865    3.9  26.6  116.3   0.1639   2.9    6.0	HT1900.1-2455                 
288.7552  10.8187    4.9  39.3   50.8   0.2168   2.4    8.0	GRS 1915+105                  
262.8218 -33.9834    4.8  19.3  169.9  -0.0988  -2.4   12.2	GX 354-0                      
259.3677 -30.3196    2.4  15.3  178.2   0.1934   4.9 ------	UNKNOWN                       
244.8553   5.0330    2.4  24.3  -35.6   0.2178   4.7 ------	UNKNOWN                       
236.7655 -10.0634    0.3  22.0  -79.6   1.8736  34.4 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
-239.008000 16.110500
16.992000 63.122000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
186.7478 -62.7599   13.5  51.2 -161.2  -3.7531  -0.9    2.6	GX 301-2                      
244.8266 -15.6253   10.5  14.3  -26.7  -1.6949  -1.1    8.9	Sco X-1                       
256.1719 -37.8720   14.3  10.5  132.3  -1.3431  -0.8    8.9	4U 1700-377                   
256.2614 -36.3498   25.1   9.5  126.1  -0.7735  -0.5    9.5	GX 349+2                      
263.0786 -24.9002   13.3  13.8   61.7  -1.3423  -0.9   10.0	GX 1+4                        
264.8904 -44.5962    4.0  19.9  131.4   5.1693   2.9   10.8	4U 1735-44                    
268.4727  -1.5360    7.3  33.8   25.6  -3.2855  -1.6    8.0	SW J1753.5-0127               
270.3144 -25.2231    4.6  19.8   70.5  -4.3355  -2.5    8.8	GX 5-1                        
270.1337 -25.8770    0.0  19.5   72.2   3.6973   2.1   12.2	GRS 1758-258                  
273.9164 -13.8862  101.5  28.2   49.6   0.2398   0.1   10.4	GX 17+2                       
275.8673 -30.4349    6.3  23.7   86.9   3.4965   1.8    5.1	H1820-303                     
285.0420 -24.8155   28.7  32.7   78.4   1.1699   0.4    6.3	HT1900.1-2455                 
263.0086 -33.8170   62.2  13.1  100.7   0.2896   0.2    1.4	GX 354-0                      
287.5529  -1.4595    3.4  46.5   47.9  19.2142   3.4 ------	UNKNOWN                       
282.7650 -40.3672    3.3  29.9  108.3   8.1812   3.5 ------	UNKNOWN                       
275.0526 -17.9101    3.0  26.9   58.1   7.3349   3.8 ------	UNKNOWN                       
273.8596 -37.0028    2.2  22.4  103.9   9.0078   5.2 ------	UNKNOWN                       
194.8781 -83.5538    2.6  56.8  173.9  43.4835   4.5 ------	UNKNOWN                       
251.2194  10.3208    3.5  39.9   -8.1   6.9899   3.3 ------	UNKNOWN                       
239.5812 -30.9568    3.7   7.8 -115.4   4.3429   3.1 ------	UNKNOWN                       
189.6158 -72.1217    3.9  52.6 -173.0  13.3225   2.9 ------	UNKNOWN                       
	UNKNOWN