Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Thu Sep 28 17:50:46 EDT 2017
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger770957
======================================================================

  Trigger: 00770957      Segment: 000

  BAT Trigger Time: 526351411.264   [s; MET]
      Trigger Stop: 526351412.288   [s; MET]
               UTC: 2017-09-06T00:43:11.622660    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 203.991655598506   Dec: -47.124728592814  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.35
     Image Trigger?:     NO
     Rate S/N Ratio:     24.3104915622864  [ if not an image trigger ]
     Image S/N Ratio:    8.35

  Analysis Position:   [ source = BAT ]
    RA: 203.991655598506   Dec: -47.124728592814  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 203.945573361657   Dec: -47.0885303150939  [deg; J2000]  
        { 13h 35m 46.9s , -47d 05' 18.7" }
         +/- 1.33934869290171 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.493920680954233 [arcmin] (formal 1-sigma fit error)
    SNR: 20.0374164938389
 
  Angular difference between the analysis and refined position is 2.873801 arcmin
 
  Partial Coding Fraction: 0.671875    [ including projection effects ]

  Duration
     T90: 88.1119999289513 +/- 1.44479753054543
        Measured from: 8.00800001621246
                   to: 96.1199999451637     [s; relative to TRIGTIME]
     T50: 42.3839999437332 +/- 0.440218133833484
        Measured from: 30.3360000252724
                   to: 72.7199999690056     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 29.8199999928474     
                   to: 30.8199999928474     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -44.755999982357     
                   to: 122.860000014305     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total    12.576611  18.670394  15.732775   4.395113
           0.116344   0.120897   0.107762   0.083602 [error]
 Peak      0.263770   0.466308   0.491167   0.189101
           0.012184   0.014824   0.015209   0.011726 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  167.616  -44.756  122.860
T90    88.112    8.008   96.120
T50    42.384   30.336   72.720
Peak    1.000   29.820   30.820
 
 
====== 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      -1.342    -0.024      0.024       -           -               -         2.02e-02     -2.77e-04          2.76e-04      27.990   57
CPL     -1.294    -0.056      0.086      944.728    -944.728      -944.728      2.10e-02     -4.08e-04          1.63e-03      27.700   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
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      -0.969     -0.062     0.062       -           -               -         9.35e-02     -3.21e-03          3.21e-03      53.160   57
CPL     -0.970     -0.057     0.073     9999.340    -9999.340      -9999.340      9.34e-02     -2.47e-03          2.29e-02      53.370   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   3.72e-06  7.53e-06  1.19e-05  4.16e-05  3.31e-05  6.47e-05   erg/cm2
      90%_error_low -1.14e-07 -1.38e-07 -1.55e-07 -1.29e-06 -4.15e-07 -1.31e-06   erg/cm2
      90%_error_hi   1.16e-07  1.38e-07  1.55e-07  1.32e-06  4.14e-07  1.33e-06   erg/cm2
Peak flux       PL   9.44e-04  1.14e-02  1.56e-01  1.34e+01  5.56e-01  1.02e+01   ph/cm2/s
      90%_error_low     N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
      90%_error_hi      N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
 
Fluence        CPL   3.68e-06  7.58e-06  1.19e-05  4.16e-05  3.30e-05  6.27e-05   erg/cm2
      90%_error_low -1.65e-07 -2.03e-07 -1.59e-07 -5.68e-06 -4.49e-07 -3.43e-06   erg/cm2
      90%_error_hi   1.30e-07  9.70e-08  2.21e-07  6.40e-07  4.53e-07  2.41e-06   erg/cm2
Peak flux      CPL   2.32e+00  3.21e+00  3.28e+00  6.09e+00  1.08e+01  1.49e+01   ph/cm2/s
      90%_error_low -2.17e-01 -1.31e-01 -1.22e-01 -1.32e+00 -3.83e-01 -1.33e+00   ph/cm2/s
      90%_error_hi   1.71e-01  1.17e-01  1.46e-01  5.11e-01  3.73e-01  5.28e-01   ph/cm2/s
 
======================================================================




Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  203.9456   -47.0885   0.0096    20.6734   -86.8903         3.7103026     20.037 TRIG_00770957                 
 
Foreground time interval of the image:
-44.756  13.037 (delta_t =  57.793 [sec])
Background time interval of the image:
-98.363 -44.756 (delta_t =  53.607 [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  -44.756 sec. to  122.860 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.34152     ( -0.0243739   0.0244646 )
Norm@50keV  : 2.01596E-02    ( -0.000276681   0.000275866 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          27.99 using 59 PHA bins.
# Reduced chi-squared =         0.4910 for     57 degrees of freedom 
# Null hypothesis probability =   9.995662e-01
 
Photon flux (15-150 keV)    in 167.6 sec: 2.42449 ( -0.03948  0.03969 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.3067e-05 ( -4.15412e-07  4.14455e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -44.756 sec. to  122.860 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.29355     ( -0.0547155   0.0869832 )
Epeak [keV] : 944.728      ( -981.04 -981.04 )
Norm@50keV  : 2.10480E-02    ( -0.000355557   0.00168469 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          27.70 using 59 PHA bins.
# Reduced chi-squared =         0.4947 for     56 degrees of freedom 
# Null hypothesis probability =   9.994582e-01
 
Photon flux (15-150 keV)    in 167.6 sec: 1.57864 ( -0.06215  0.03559 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.30212e-05 ( -4.49253e-07  4.53271e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model
Time interval is from   29.820 sec. to   30.820 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.9687     ( -0.061851   0.0623362 )
Norm@50keV  : 9.35257E-02    ( -0.00321391   0.00320781 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.16 using 59 PHA bins.
# Reduced chi-squared =         0.9327 for     57 degrees of freedom 
# Null hypothesis probability =   6.197866e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.555697 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.02289e-06 ( -3.8471e-08  3.85856e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   29.820 sec. to   30.820 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.970125     ( -0.0632722   0.0663618 )
Epeak [keV] : 9999.34      ( -9999.36 -9999.36 )
Norm@50keV  : 9.33929E-02    ( -0.00317996   0.0221972 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.37 using 59 PHA bins.
# Reduced chi-squared =         0.9530 for     56 degrees of freedom 
# Null hypothesis probability =   5.751268e-01
 
Photon flux (15-150 keV)    in 1 sec: 10.7518 ( -0.3831  0.3734 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.02308e-06 ( -3.789e-08  3.49306e-08 ) ergs/cm2
 

Time-resolved spectra




Distribution

T90 vs. Hardness ratio plot

T90                                   = 88.112 sec.
Hardness ratio (energy fluence ratio) = 1.57844680698

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

S(15-50 keV)  = 1.1251038e-05
S(50-150 keV) = 2.1815505e-05

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 = 2.046991096713631E-02, IMY = 3.767828298925605E-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:
-98.363410 -44.756000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.4450 -60.6850    1.8  31.6 -136.7   0.8750   6.4    5.3	Cen X-3                       
186.5757 -62.9800    0.0  23.6 -137.1   0.2693   2.2   12.8	GX 301-2                      
245.0100 -15.6318    0.9  42.4    2.8   2.1720  12.4    1.8	Sco X-1                       
256.0407 -37.8468    1.4  24.3   33.3   0.9954   8.3    2.6	4U 1700-377                   
256.2887 -36.3036    2.9  25.7   32.0   0.4832   3.9   10.1	GX 349+2                      
262.8372 -24.6061    5.9  38.7   31.6  -0.3765  -2.0   12.6	GX 1+4                        
264.5645 -44.3261    3.0  23.1   55.9   0.4770   3.8   10.7	4U 1735-44                    
270.4199 -25.0907    4.8  41.4   41.4   0.5724   2.4    7.4	GX 5-1                        
270.2188 -25.7681  347.0  40.7   41.7   0.0079   0.0    4.8	GRS 1758-258                  
276.1221 -30.4079    4.8  39.6   52.4   0.5811   2.4   10.5	H1820-303                     
263.1636 -33.8515  112.6  30.7   39.7  -0.0159  -0.1    8.8	GX 354-0                      
275.5002 -41.5771    1.9  30.7   64.2   0.9804   6.1 ------	UNKNOWN                       
233.8352 -57.2113    0.4   0.0   65.7   3.0946  30.6 ------	UNKNOWN                       
109.2905 -71.1480    2.5  45.8 -171.6   0.9110   4.6 ------	UNKNOWN                       

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

Time interval of the image:
-44.756000 13.036600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.6432 -60.6722    4.7  31.5 -136.6  -0.4755  -2.4   10.1	Cen X-3                       
186.6647 -62.7524  255.3  23.6 -136.5   0.0072   0.0    1.1	GX 301-2                      
244.8731 -15.5467    6.8  42.5    2.6   0.3910   1.7    8.3	Sco X-1                       
256.1661 -37.8462    4.1  24.3   33.5  -0.4335  -2.8    8.5	4U 1700-377                   
256.3152 -36.2974    3.5  25.8   32.0  -0.5420  -3.3    9.5	GX 349+2                      
262.8783 -24.7962   18.3  38.6   31.8   0.1597   0.6    7.7	GX 1+4                        
264.7826 -44.4509   41.3  23.1   56.5  -0.0490  -0.3    1.7	4U 1735-44                    
270.2910 -25.0613  368.1  41.4   41.3  -0.0107  -0.0    1.1	GX 5-1                        
270.2992 -25.7364   97.0  40.8   41.8  -0.0397  -0.1    0.4	GRS 1758-258                  
275.8501 -30.3118   12.7  39.5   52.0   0.3090   0.9    5.1	H1820-303                     
263.1550 -33.8332   11.6  30.7   39.6  -0.2074  -1.0    8.3	GX 354-0                      
203.9456 -47.0885    0.6  20.7  -86.9   3.7100  20.0 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
56.836590 602.748700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4712 -40.6693   16.2  48.2 -154.2   1.3506   0.7    7.4	Vela X-1                      
170.3143 -60.6503    2.0  23.6  177.3   3.7061   5.9    1.6	Cen X-3                       
186.6660 -62.6144    4.5  18.3  160.5   1.6816   2.5    9.4	GX 301-2                      
244.9887 -15.6405    0.8  46.2   15.6  17.2859  13.9    0.5	Sco X-1                       
255.9867 -37.8193    2.9  38.7   50.1   5.1559   4.0    1.5	4U 1700-377                   
256.2727 -36.2724    4.4  39.7   48.2   3.2496   2.6   12.0	GX 349+2                      
264.7763 -44.4352  619.3  41.4   64.0  -0.0430  -0.0    1.7	4U 1735-44                    
262.9001 -33.6844    4.6  45.6   49.5   6.1518   2.5   10.1	GX 354-0                      
 99.9699 -84.1279    2.4  44.6  142.7   7.7356   4.8 ------	UNKNOWN                       
233.8484 -57.2303    0.3  20.6   84.8  30.6271  40.6 ------	UNKNOWN                       
111.9867 -60.6200    2.7  51.2  173.5   7.8197   4.3 ------	UNKNOWN                       
203.9689 -47.1024    0.3   0.1  -99.2  25.2494  42.8 ------	UNKNOWN                       
145.9452 -36.2670    4.1  43.7 -142.9   4.4156   2.8 ------	UNKNOWN                       
191.1997  -4.9670    3.1  43.6  -64.2  13.1963   3.7 ------	UNKNOWN                       
207.6195   5.3411    2.9  52.6  -41.0  17.3922   4.0 ------	UNKNOWN                       
148.9460 -25.7026    3.7  48.0 -129.0  14.2568   3.2 ------	UNKNOWN