Analysis Summary

Notes:

Special note: Due to the low partial coding fraction, the refined position is found using the DETECTION mask. Therefore, the refined position and the mask shadow pattern shown here are from analyses with DETECTION mask, everything else uses the FLUX mask.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sat May  9 18:47:21 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger445414
======================================================================

  Trigger: 00445414      Segment: 000

  BAT Trigger Time: 319267056.192   [s; MET]
      Trigger Stop: 319267057.216   [s; MET]
               UTC: 2011-02-13T05:17:29.533120    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 43.0039088785786   Dec: 49.2914056374636  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.08
     Image Trigger?:     NO
     Rate S/N Ratio:     32.6802692767364  [ if not an image trigger ]
     Image S/N Ratio:    12.08

  Analysis Position:   [ source = BAT ]
    RA: 43.0039088785786   Dec: 49.2914056374636  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 42.9780563858659   Dec: 49.2784635191313  [deg; J2000]  
        { 02h 51m 54.7s , +49d 16' 42.5" }
         +/- 1.34481017349709 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.665404821369469 [arcmin] (formal 1-sigma fit error)
    SNR: 19.9212677029074
 
  Angular difference between the analysis and refined position is 1.275444 arcmin
 
  Partial Coding Fraction: 0.05810547    [ including projection effects ]

  Duration
     T90: 48 +/- 16
        Measured from: -31.1919999718666
                   to: 16.8080000281334     [s; relative to TRIGTIME]
     T50: 16 +/- 16
        Measured from: -15.1919999718666
                   to: 0.808000028133392     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 8.30800002813339     
                   to: 9.30800002813339     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -31.1919999718666     
                   to: 32.8080000281334     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.872127   3.510052   2.196273   0.536696
           0.178954   0.187072   0.165447   0.136119 [error]
 Peak      0.072943   0.083880   0.044559   0.004717
           0.023418   0.023687   0.019903   0.016653 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   64.000  -31.192   32.808
T90    48.000  -31.192   16.808
T50    16.000  -15.192    0.808
Peak    1.000    8.308    9.308
 
 
====== 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      -1.831    -0.116      0.114       -           -               -         1.01e-02     -6.67e-04          6.62e-04      59.810   57
CPL     -1.835    -0.755      0.264     9999.360    -9999.350      -9999.360      1.01e-02     -3.53e-03          -1.38e-03      59.820   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      -2.824     -0.963     0.614       -           -               -         6.42e-03     -3.92e-03          3.74e-03      48.100   57
CPL     -0.843     -1.170     4.474       26.612      N/A           N/A         8.43e-02        N/A               N/A         46.690   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   1.13e-06  1.70e-06  1.91e-06  4.07e-06  5.97e-06  8.81e-06   erg/cm2
      90%_error_low -1.16e-07 -1.07e-07 -1.70e-07 -7.20e-07 -3.95e-07 -8.72e-07   erg/cm2
      90%_error_hi   1.20e-07  1.07e-07  1.69e-07  8.15e-07  3.97e-07  9.39e-07   erg/cm2
Peak flux       PL   9.58e-01  4.47e-01  1.26e-01  4.47e-02  1.56e+00  1.58e+00   ph/cm2/s
      90%_error_low -4.32e-01 -2.00e-01 -8.75e-02 -4.47e-02 -6.22e-01 -6.28e-01   ph/cm2/s
      90%_error_hi   4.53e-01  1.90e-01  9.66e-02  7.54e-02  6.22e-01  6.28e-01   ph/cm2/s
 
Fluence        CPL   1.14e-06  1.69e-06  1.90e-06  4.41e-06  6.00e-06  9.24e-06   erg/cm2
      90%_error_low -1.29e-07 -1.22e-07    N/A    -2.05e-06 -5.72e-07 -2.16e-06   erg/cm2
      90%_error_hi   1.07e-07  1.65e-07    N/A     1.23e-06  3.58e-07  4.63e-07   erg/cm2
Peak flux      CPL   7.97e-01  5.99e-01  1.57e-01  1.19e-02  1.56e+00  1.56e+00   ph/cm2/s
      90%_error_low     N/A       N/A   -1.28e-01     N/A   -6.34e-01 -6.34e-01   ph/cm2/s
      90%_error_hi      N/A       N/A    1.60e-01     N/A    6.28e-01  6.31e-01   ph/cm2/s
 
======================================================================
  • Special notes of this burst




    Image

    Pre-slew 15.0-350.0 keV image (Event data; DETECTION mask)

    #   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   42.9725    49.2805   0.0092    48.4511    38.5090         8.5972114     20.949 TRIG_00445414                 
 
Foreground time interval of the image:
-31.192  13.109 (delta_t =  44.301 [sec])
Background time interval of the image:
-145.491 -31.192 (delta_t = 114.299 [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  -31.192 sec. to   32.808 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.8312     ( -0.116178   0.1139 )
Norm@50keV  : 1.01317E-02    ( -0.000667229   0.000661633 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.81 using 59 PHA bins.
# Reduced chi-squared =          1.049 for     57 degrees of freedom 
# Null hypothesis probability =   3.740528e-01
 
Photon flux (15-150 keV)    in 64 sec: 1.41346 ( -0.09148  0.09185 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.96513e-06 ( -3.95456e-07  3.97399e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -31.192 sec. to   32.808 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.06502     ( -0.756857   0.262776 )
Epeak [keV] : 28.8788      ( -9999.35 -9999.36 )
Norm@50keV  : 7.64157E-03    ( -0.00104519   0.00110783 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.59 using 59 PHA bins.
# Reduced chi-squared =          1.064 for     56 degrees of freedom 
# Null hypothesis probability =   3.464089e-01
 
Photon flux (15-150 keV)    in 64 sec: 1.41971 ( -0.09779  0.08544 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.99694e-06 ( -5.72313e-07  3.57539e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    8.308 sec. to    9.308 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.82425     ( -0.964868   0.611469 )
Norm@50keV  : 6.41579E-03    ( -0.00392741   0.00373941 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.10 using 59 PHA bins.
# Reduced chi-squared =         0.8438 for     57 degrees of freedom 
# Null hypothesis probability =   7.933796e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.55773 ( -0.62156  0.6225 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.15385e-08 ( -3.06689e-08  3.12939e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    8.308 sec. to    9.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.842877     ( -1.16983   4.4748 )
Epeak [keV] : 26.6121      (   )
Norm@50keV  : 8.42710E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.69 using 59 PHA bins.
# Reduced chi-squared =         0.8337 for     56 degrees of freedom 
# Null hypothesis probability =   8.079234e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.56274 ( -0.634076  0.62848 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.57234e-08 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 48.0 sec.
Hardness ratio (energy fluence ratio) = 1.12416457571

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

    S(15-50 keV)  = 2.829902e-06
S(50-150 keV) = 3.135234e-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 (with DETECTION mask) 

    IMX = 8.829483902278739E-01, IMY = -7.025551529741617E-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:
-145.491400 -31.192000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.3395  38.2884    5.6  51.8  -33.9   0.7584   2.0    8.2	Cyg X-2                       
 53.0041  16.1988    2.2  39.9   86.8   2.1198   5.4 ------	UNKNOWN                       
  5.6208 -23.0657    2.7  31.7 -154.3   0.5088   4.3 ------	UNKNOWN                       
329.0934  14.7738    2.7  43.6  -64.1   1.9936   4.2 ------	UNKNOWN

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

    Time interval of the image:
-31.192000 13.108600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
325.9951  38.3750    0.0  52.1  -33.9   0.3860   1.5    8.9	Cyg X-2                       
 42.9771  49.2782    0.6  48.5   38.5   9.3357  18.6 ------	UNKNOWN                       
 41.7950  -0.2338    2.4  29.8  117.1   0.6163   4.9 ------	UNKNOWN                       
325.2635  27.1296    2.4  49.1  -48.0   1.5890   4.8 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
80.508640 962.830400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6508  22.0192    0.5  42.0  134.6  35.7860  24.2    1.0	Crab                          
154.7152  73.5281    2.9  48.8   39.6   8.8294   4.0 ------	UNKNOWN                       
 73.2223   9.7775    2.5  46.9  156.2   6.7668   4.6 ------	UNKNOWN                       
343.7541  74.5679    2.7  35.0   -4.4   2.6867   4.3 ------	UNKNOWN                       
 30.5394  48.2188    2.9   8.2  -73.7   1.6371   4.0 ------	UNKNOWN