Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Tue May  5 17:26:23 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger635887
======================================================================

  Trigger: 00635887      Segment: 000

  BAT Trigger Time: 448771768   [s; MET]
      Trigger Stop: 448771832   [s; MET]
               UTC: 2015-03-23T02:49:14.653860    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 128.191265245984   Dec: 45.4343019594773  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.18
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    10.18

  Analysis Position:   [ source = BAT ]
    RA: 128.191265245984   Dec: 45.4343019594773  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst; manually chosen time period ]
    RA: 128.191   Dec: 45.4343  [deg; J2000]
        { 08h 32m 45.8s , +45d 26' 03.5" }
        +/- 2.30735244623 [arcmin] (estimated 90% radius based on SNR)
    SNR: 9.21384709763
 
 
  Angular difference between the analysis and refined position is 0.011168 arcmin
 
  Partial Coding Fraction: 0.328125    [ including projection effects ]

  Duration
     T90: 149.727999925613 +/- 9.12243565164621
        Measured from: 3.39600002765656
                   to: 153.12399995327     [s; relative to TRIGTIME]
     T50: 12.7399999499321 +/- 1.04199806984926
        Measured from: 124.560000002384
                   to: 137.299999952316     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 131.587999999523     
                   to: 132.587999999523     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.54000002145767     
                   to: 191.407999992371     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.362431   3.671754   2.393276   0.525772
           0.111853   0.116154   0.100387   0.083913 [error]
 Peak      0.203833   0.214188   0.131249   0.025997
           0.008326   0.008400   0.007195   0.004748 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  192.948   -1.540  191.408
T90   149.728    3.396  153.124
T50    12.740  124.560  137.300
Peak    1.000  131.588  132.588
 
 
====== 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      -1.738    -0.075      0.074       -           -               -         3.14e-03     -1.26e-04          1.26e-04      43.760   57
CPL     -1.613    -0.187      0.294      154.878     -76.124      -154.878      3.63e-03     -5.92e-04          1.41e-03      43.180   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      -1.847     -0.091     0.089       -           -               -         3.28e-02     -1.71e-03          1.69e-03      60.580   57
CPL     -1.669     -0.171     0.362       89.332     -41.302       -89.332      4.06e-02     -8.08e-03          2.14e-02      59.780   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   9.68e-07  1.54e-06  1.85e-06  4.32e-06  5.60e-06  8.67e-06   erg/cm2
      90%_error_low -6.59e-08 -6.17e-08 -1.01e-07 -4.95e-07 -2.34e-07 -5.72e-07   erg/cm2
      90%_error_hi   6.75e-08  6.15e-08  1.01e-07  5.38e-07  2.35e-07  6.05e-07   erg/cm2
Peak flux       PL   1.89e+00  1.55e+00  8.61e-01  7.05e-01  4.61e+00  5.00e+00   ph/cm2/s
      90%_error_low -1.49e-01 -7.49e-02 -5.93e-02 -9.41e-02 -2.25e-01 -2.34e-01   ph/cm2/s
      90%_error_hi   1.53e-01  7.46e-02  5.91e-02  1.03e-01  2.25e-01  2.34e-01   ph/cm2/s
 
Fluence        CPL   9.45e-07  1.55e-06  1.86e-06  3.56e-06  5.54e-06  7.91e-06   erg/cm2
      90%_error_low -8.17e-08 -7.05e-08 -1.04e-07 -1.21e-06 -2.70e-07 -1.25e-06   erg/cm2
      90%_error_hi   7.55e-08  7.14e-08  1.05e-07  1.29e-06  2.68e-07  9.84e-07   erg/cm2
Peak flux      CPL   1.83e+00  1.57e+00  8.69e-01  5.66e-01  4.56e+00  4.84e+00   ph/cm2/s
      90%_error_low -1.83e-01 -8.67e-02 -6.19e-02 -1.91e-01 -2.43e-01 -3.32e-01   ph/cm2/s
      90%_error_hi   1.85e-01  8.80e-02  6.28e-02  1.70e-01  2.44e-01  3.23e-01   ph/cm2/s
 
======================================================================
  • Special notes of this burst




    Image

    Pre-slew 15.0-50.0 keV image (Event data)

    #RAcent DECcent POSerr Theta  Phi  Peak_Cts  SNR Name
128.191 45.434 0.000 42.141 -139.787 1.139 9.214 TRIG_00635887
 
Image time interval: 0.000 to 64.000 [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   -1.540 sec. to  191.408 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.73771     ( -0.0747602   0.0740945 )
Norm@50keV  : 3.14244E-03    ( -0.000126327   0.000125852 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.76 using 59 PHA bins.
# Reduced chi-squared =         0.7677 for     57 degrees of freedom 
# Null hypothesis probability =   9.011188e-01
 
Photon flux (15-150 keV)    in 192.9 sec: 0.423021 ( -0.017196  0.017267 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.59838e-06 ( -2.33598e-07  2.3462e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -1.540 sec. to  191.408 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.61299     ( -0.187448   0.293693 )
Epeak [keV] : 154.878      ( -76.1236 -154.878 )
Norm@50keV  : 3.62662E-03    ( -0.000591572   0.00141279 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.18 using 59 PHA bins.
# Reduced chi-squared =         0.7711 for     56 degrees of freedom 
# Null hypothesis probability =   8.951354e-01
 
Photon flux (15-150 keV)    in 192.9 sec: 0.419271 ( -0.019014  0.01903 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.53723e-06 ( -2.69883e-07  2.68436e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from  131.588 sec. to  132.588 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.84691     ( -0.0910035   0.089392 )
Norm@50keV  : 3.28403E-02    ( -0.00170681   0.00169346 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.58 using 59 PHA bins.
# Reduced chi-squared =          1.063 for     57 degrees of freedom 
# Null hypothesis probability =   3.480333e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.61052 ( -0.22501  0.22546 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.02023e-07 ( -1.57568e-08  1.58473e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  131.588 sec. to  132.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.66855     ( -0.171407   0.362025 )
Epeak [keV] : 89.3320      ( -41.3016 -89.332 )
Norm@50keV  : 4.06176E-02    ( -0.00808046   0.0213672 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.78 using 59 PHA bins.
# Reduced chi-squared =          1.067 for     56 degrees of freedom 
# Null hypothesis probability =   3.402656e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.56022 ( -0.24331  0.24366 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 149.728 sec.
Hardness ratio (energy fluence ratio) = 1.19941632535

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

    S(15-50 keV)  = 2.5067749e-06
S(50-150 keV) = 3.091587e-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 = -0.691010542175, IMY = 0.584218515664

    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:
-11.899380 -1.540000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4598  35.3550   11.8  58.9  -17.2   0.1935   1.0    0.8	Her X-1

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

    Time interval of the image:
-1.500000 20.000000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4465  35.4052    6.9  58.8  -17.2  -0.8176  -1.6    3.8	Her X-1                       
236.3902  12.2140    1.9  54.1   16.5   2.4833   5.9 ------	UNKNOWN                       
236.7431  15.9141    2.5  52.5   12.3   1.4481   4.6 ------	UNKNOWN                       
171.8449  27.6691    2.9  10.0  155.8   0.3015   4.0 ------	UNKNOWN                       
128.2024  45.4220    1.2  42.1 -139.8   1.4180   9.8 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
135.300590 771.500600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6278  22.0131    0.7  43.1 -135.6  13.3511  15.7    0.3	Crab                          
136.4833  11.9698    3.0  34.2  137.6   2.3027   3.9 ------	UNKNOWN                       
128.1722  45.4404    1.7   0.0 -126.7   2.5357   6.7 ------	UNKNOWN                       
 84.3931   3.5212    3.2  56.7 -152.2   8.3926   3.6 ------	UNKNOWN                       
 77.6456  16.2966    3.3  51.1 -135.7   8.2772   3.5 ------	UNKNOWN