Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Thu Sep 28 17:39:39 EDT 2017
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger770981
======================================================================

  Trigger: 00770981      Segment: 000

  BAT Trigger Time: 526375597.248   [s; MET]
      Trigger Stop: 526375598.272   [s; MET]
               UTC: 2017-09-06T07:26:17.605220    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 128.703619534125   Dec: 70.7817005714058  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.09
     Image Trigger?:     NO
     Rate S/N Ratio:     21.1187120819429  [ if not an image trigger ]
     Image S/N Ratio:    11.09

  Analysis Position:   [ source = BAT ]
    RA: 128.703619534125   Dec: 70.7817005714058  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 128.669502283292   Dec: 70.804276145787  [deg; J2000]  
        { 08h 34m 40.7s , +70d 48' 15.4" }
         +/- 0.751874977030309 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.215075986987955 [arcmin] (formal 1-sigma fit error)
    SNR: 45.7144177058612
 
  Angular difference between the analysis and refined position is 1.512707 arcmin
 
  Partial Coding Fraction: 0.328125    [ including projection effects ]

  Duration
     T90: 45.0759999752045 +/- 4.80024419382997
        Measured from: -25.7840000391006
                   to: 19.2919999361038     [s; relative to TRIGTIME]
     T50: 12.6159999370575 +/- 0.9888012956279
        Measured from: -3.28000003099442
                   to: 9.33599990606308     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 6.17599999904633     
                   to: 7.17599999904633     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -35.2080000042915     
                   to: 41.3279999494553     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.639321   5.061694   3.903203   0.866434
           0.109002   0.116378   0.102086   0.079517 [error]
 Peak      0.143948   0.287148   0.324975   0.096604
           0.016096   0.018423   0.018808   0.013174 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   76.536  -35.208   41.328
T90    45.076  -25.784   19.292
T50    12.616   -3.280    9.336
Peak    1.000    6.176    7.176
 
 
====== 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: CPL)
 
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      -1.669    -0.052      0.052       -           -               -         1.26e-02     -3.58e-04          3.58e-04      58.460   57
CPL     -1.277    -0.215      0.225      101.244     -18.425        54.615      1.91e-02     -3.80e-03          5.01e-03      48.440   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
 
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      -1.160     -0.105     0.106       -           -               -         6.19e-02     -4.08e-03          4.08e-03      63.000   57
CPL     -0.358     -0.460     0.516      118.837     -25.544        78.942      1.41e-01     -5.16e-02          9.20e-02      53.460   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   1.45e-06  2.40e-06  3.02e-06  7.57e-06  8.99e-06  1.44e-05   erg/cm2
      90%_error_low -7.83e-08 -7.72e-08 -1.06e-07 -5.75e-07 -2.61e-07 -6.40e-07   erg/cm2
      90%_error_hi   8.00e-08  7.70e-08  1.05e-07  6.04e-07  2.61e-07  6.62e-07   erg/cm2
Peak flux       PL   4.19e-04  4.24e-03  4.65e-02  4.95e+00  2.07e-01  3.76e+00   ph/cm2/s
      90%_error_low -2.80e-05     N/A       N/A   -2.21e-01     N/A       N/A     ph/cm2/s
      90%_error_hi   6.05e-05     N/A       N/A    6.76e-01     N/A       N/A     ph/cm2/s
 
Fluence        CPL   1.32e-06  2.46e-06  3.13e-06  4.73e-06  8.79e-06  1.16e-05   erg/cm2
      90%_error_low -1.01e-07 -8.46e-08 -1.22e-07 -1.00e-06 -2.84e-07 -1.04e-06   erg/cm2
      90%_error_hi   1.04e-07  8.51e-08  1.23e-07  1.34e-06  2.83e-07  1.35e-06   erg/cm2
Peak flux      CPL   1.49e+00  2.37e+00  2.25e+00  1.66e+00  7.05e+00  7.77e+00   ph/cm2/s
      90%_error_low -2.84e-01 -2.03e-01 -1.91e-01 -4.77e-01 -5.07e-01 -7.11e-01   ph/cm2/s
      90%_error_hi   2.97e-01  2.05e-01  1.95e-01  7.03e-01  5.08e-01  8.38e-01   ph/cm2/s
 
======================================================================
  • Special notes of this burst




    Image

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

    #   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  128.6695    70.8043   0.0042    45.3602   -30.6633        13.7827072     45.714 TRIG_00770981                 
 
Foreground time interval of the image:
-35.208  41.328 (delta_t =  76.536 [sec])
Background time interval of the image:
-239.248 -35.208 (delta_t = 204.040 [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  -35.208 sec. to   41.328 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.66934     ( -0.051889   0.0517362 )
Norm@50keV  : 1.26452E-02    ( -0.000358263   0.000358212 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.46 using 59 PHA bins.
# Reduced chi-squared =          1.026 for     57 degrees of freedom 
# Null hypothesis probability =   4.213783e-01
 
Photon flux (15-150 keV)    in 76.54 sec: 1.66191 ( -0.05345  0.05365 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.98603e-06 ( -2.60965e-07  2.61136e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -35.208 sec. to   41.328 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.27732     ( -0.214759   0.22513 )
Epeak [keV] : 101.244      ( -18.4256 54.6152 )
Norm@50keV  : 1.91453E-02    ( -0.00380462   0.00501101 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.44 using 59 PHA bins.
# Reduced chi-squared =         0.8649 for     56 degrees of freedom 
# Null hypothesis probability =   7.536400e-01
 
Photon flux (15-150 keV)    in 76.54 sec: 1.61335 ( -0.05867  0.05902 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.78901e-06 ( -2.83735e-07  2.82684e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    6.176 sec. to    7.176 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.16034     ( -0.105368   0.106408 )
Norm@50keV  : 6.18777E-02    ( -0.00408334   0.0040795 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.00 using 59 PHA bins.
# Reduced chi-squared =          1.105 for     57 degrees of freedom 
# Null hypothesis probability =   2.723710e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.206518 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.35097e-07 ( -4.39847e-08  4.41066e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    6.176 sec. to    7.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.358233     ( -0.459799   0.515808 )
Epeak [keV] : 118.837      ( -25.5438 78.9416 )
Norm@50keV  : 0.140621    ( -0.0516324   0.0919689 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.46 using 59 PHA bins.
# Reduced chi-squared =         0.9547 for     56 degrees of freedom 
# Null hypothesis probability =   5.715000e-01
 
Photon flux (15-150 keV)    in 1 sec: 7.04655 ( -0.50669  0.50757 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.2273e-07 ( -4.57643e-08  4.56139e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 45.076 sec.
Hardness ratio (energy fluence ratio) = 1.27133460256

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

    S(15-50 keV)  = 3.777212e-06
S(50-150 keV) = 5.011664e-06

    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 = 8.710630366018427E-01, IMY = 5.164456075814051E-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:
-239.248000 -35.208000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4698  35.3272    2.4  22.4  165.1   0.9219   4.8    1.1	Her X-1                       
299.5224  35.0938    4.2  39.1   96.1   2.0312   2.8    7.3	Cyg X-1                       
308.1799  40.9780    2.7  39.3   81.8   3.2110   4.3    3.5	Cyg X-3                       
221.5535   5.7530    2.5  56.7 -151.8   5.7325   4.7 ------	UNKNOWN

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

    Time interval of the image:
-35.208000 41.328000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3937  35.5020    4.5  22.2  165.2  -0.4084  -2.6   10.1	Her X-1                       
299.6085  35.2255    9.4  39.0   95.9  -0.6214  -1.2    1.7	Cyg X-1                       
308.1596  40.7907    4.3  39.4   82.1  -1.3126  -2.7   10.0	Cyg X-3                       
259.0263   5.2927    3.5  52.7  162.4   1.8205   3.3 ------	UNKNOWN                       
338.9313  69.5454    2.4  37.1   27.7   1.0129   4.9 ------	UNKNOWN                       
250.3813   1.8227    2.7  55.8  173.2   2.8158   4.2 ------	UNKNOWN                       
235.1430   2.5728    2.5  56.4 -168.5   2.8026   4.6 ------	UNKNOWN                       
128.6695  70.8043    0.3  45.4  -30.7  13.7818  45.7 ------	UNKNOWN                       
117.9956  66.5739    2.3  51.0  -29.6   2.3563   5.1 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
391.852590 839.438700
840.752000 962.867400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
268.3451  -1.3277   13.1  43.3  -57.9  -1.3640  -0.9    7.6	SW J1753.5-0127               
273.9882 -14.1343    8.2  36.2  -76.8   1.5888   1.4    6.0	GX 17+2                       
276.0250 -30.3248   37.9  37.9 -103.9   0.3295   0.3    5.8	H1820-303                     
285.0360 -24.9205   42.1  28.4 -101.0  -0.1641  -0.3    0.0	HT1900.1-2455                 
288.8015  10.9204    1.3  30.9  -23.7   4.3730   8.8    1.5	GRS 1915+105                  
299.6062  35.2099    2.9  47.1    9.9   3.1219   4.0    0.9	Cyg X-1                       
308.2264  40.9854    4.6  51.7   19.9   4.5647   2.5    5.6	Cyg X-3                       
266.0122  -0.4798    3.0  45.8  -57.6   8.6500   3.9 ------	UNKNOWN