GRB160321A: Summary Image Light curves Spectra Distribution Others

Analysis Summary

Notes:

• 1) No attempt has been made to eliminate the non-significant decimal places.
• 2) This batgrbproduct analysis is done using the HEASARC data.
• 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Thu Apr 14 18:25:10 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger680017
======================================================================

  Trigger: 00680017      Segment: 000

  BAT Trigger Time: 480268543.232   [s; MET]
      Trigger Stop: 480268551.424   [s; MET]
               UTC: 2016-03-21T15:55:27.220500    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 99.4143335524643   Dec: 5.71469069735744  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.2
     Image Trigger?:     NO
     Rate S/N Ratio:     13.3041346956501  [ if not an image trigger ]
     Image S/N Ratio:    9.2

  Analysis Position:   [ source = BAT ]
    RA: 99.4143335524643   Dec: 5.71469069735744  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 99.4212181814234   Dec: 5.75268135623526  [deg; J2000]  
        { 06h 37m 41.1s , +05d 45' 09.7" }
         +/- 1.61811279350972 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.67868839833209 [arcmin] (formal 1-sigma fit error)
    SNR: 15.2944685913674
 
  Angular difference between the analysis and refined position is 2.316198 arcmin
 
  Partial Coding Fraction: 0.9609375    [ including projection effects ]

  Duration
     T90: 33.4759999513626 +/- 4.82827839746115
        Measured from: -18.1359999775887
                   to: 15.339999973774     [s; relative to TRIGTIME]
     T50: 16.8879999518394 +/- 5.19521778066117
        Measured from: -9.71999996900558
                   to: 7.16799998283386     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.7960000038147     
                   to: 2.7960000038147     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -20.8840000033379     
                   to: 19.1000000238419     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.356468   0.409269   0.202134   0.015496
           0.034318   0.035969   0.032025   0.030118 [error]
 Peak      0.019696   0.021223   0.010212   0.007957
           0.005436   0.005897   0.005098   0.004678 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   39.984  -20.884   19.100
T90    33.476  -18.136   15.340
T50    16.888   -9.720    7.168
Peak    1.000    1.796    2.796
 
 
====== 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      -1.888    -0.196      0.187       -           -               -         1.46e-03     -1.90e-04          1.86e-04      52.840   57
CPL     -1.145    -0.773      0.982       46.794     -13.500       -46.794      3.99e-03     -2.55e-03          1.14e-02      50.160   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      -1.659     -0.628     0.593       -           -               -         3.25e-03     -1.22e-03          1.13e-03      48.980   57
CPL     -1.670     -0.618     0.608     9999.300    -9999.290      -9999.300      3.24e-03     -3.24e-03          3.23e-02      48.980   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   1.08e-07  1.56e-07  1.69e-07  3.40e-07  5.37e-07  7.72e-07   erg/cm2
      90%_error_low -1.53e-08 -1.61e-08 -2.95e-08 -1.05e-07 -6.80e-08 -1.40e-07   erg/cm2
      90%_error_hi   1.56e-08  1.60e-08  3.03e-08  1.33e-07  6.98e-08  1.63e-07   erg/cm2
Peak flux       PL   1.56e-01  1.43e-01  9.05e-02  8.78e-02  4.26e-01  4.77e-01   ph/cm2/s
      90%_error_low -7.16e-02 -4.38e-02 -4.24e-02 -6.02e-02 -1.30e-01 -1.51e-01   ph/cm2/s
      90%_error_hi   7.61e-02  4.36e-02  4.31e-02  1.16e-01  1.30e-01  1.57e-01   ph/cm2/s
 
Fluence        CPL   1.02e-07  1.71e-07  1.60e-07  9.55e-08  4.92e-07  5.28e-07   erg/cm2
      90%_error_low -1.70e-08    N/A    -3.78e-08 -6.99e-08 -7.67e-08 -1.07e-07   erg/cm2
      90%_error_hi   1.70e-08    N/A     3.46e-08  2.62e-07  8.27e-08  2.71e-07   erg/cm2
Peak flux      CPL   1.59e-01  1.39e-01  8.97e-02  4.76e-02  4.27e-01  4.95e-01   ph/cm2/s
      90%_error_low -8.30e-02 -3.94e-02     N/A   -2.95e-02 -1.31e-01 -1.88e-01   ph/cm2/s
      90%_error_hi   8.36e-02  5.18e-02     N/A    2.28e-02  1.29e-01  1.58e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   99.4212     5.7527   0.0126    17.2182  -141.8376         1.1024749     15.294 TRIG_00680017                 
 
Foreground time interval of the image:
-20.884  19.100 (delta_t =  39.984 [sec])
Background time interval of the image:
-239.232 -20.884 (delta_t = 218.348 [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

Other quick-look light curves:

• 64 ms binning (zoomed)
• 16 ms binning (zoomed)
• 8 ms binning (zoomed)
• 2 ms binning (zoomed)
• SN=5 or 10 s binning (full-time range)
• Raw light curve

Spectra

Notes:

• 1) The fitting includes the systematic errors.
• 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
• 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.

Time averaged spectrum fit using the average DRM

Power-law model

Time interval is from  -20.884 sec. to   19.100 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.88831     ( -0.196075   0.186858 )
Norm@50keV  : 1.46141E-03    ( -0.000190173   0.000186354 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.84 using 59 PHA bins.
# Reduced chi-squared =         0.9269 for     57 degrees of freedom 
# Null hypothesis probability =   6.319662e-01
 
Photon flux (15-150 keV)    in 39.98 sec: 0.208707 ( -0.021286  0.021287 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.37207e-07 ( -6.80128e-08  6.97983e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -20.884 sec. to   19.100 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.14517     ( -0.772679   0.982405 )
Epeak [keV] : 46.7941      ( -13.5 -46.7941 )
Norm@50keV  : 3.99099E-03    ( -0.00255057   0.0113853 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.16 using 59 PHA bins.
# Reduced chi-squared =         0.8957 for     56 degrees of freedom 
# Null hypothesis probability =   6.944532e-01
 
Photon flux (15-150 keV)    in 39.98 sec: 0.202712 ( -0.022049  0.022111 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.91886e-07 ( -7.67092e-08  8.27102e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    1.796 sec. to    2.796 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.65862     ( -0.628491   0.592658 )
Norm@50keV  : 3.25115E-03    ( -0.00121527   0.00112766 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.98 using 59 PHA bins.
# Reduced chi-squared =         0.8592 for     57 degrees of freedom 
# Null hypothesis probability =   7.663193e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.425751 ( -0.12955  0.129556 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.02155e-08 ( -1.12751e-08  1.20504e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    1.796 sec. to    2.796 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.47593     ( -0.618761   0.607131 )
Epeak [keV] : 161.504      ( -9999.35 -9999.36 )
Norm@50keV  : 1.20977E-03    ( -0.00121349   0.0343154 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.79 using 59 PHA bins.
# Reduced chi-squared =         0.8712 for     56 degrees of freedom 
# Null hypothesis probability =   7.419215e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.426517 ( -0.130771  0.128842 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.1746e-08 ( -1.33601e-08  7.09432e-09 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 33.476 sec.
Hardness ratio (energy fluence ratio) = 1.08053747598

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

S(15-50 keV)  = 2.636556e-07
S(50-150 keV) = 2.735616e-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 = -2.436630703935760E-01, IMY = 1.914851246551121E-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:
-239.232000 -20.884000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6377  22.0138    0.4  27.8  -87.5   8.9247  30.4    0.3	Crab                          
124.6432 -33.4501    2.8  51.7  154.8   4.2085   4.2 ------	UNKNOWN                       
102.9741 -36.2761    3.3  54.1  177.1   2.6883   3.5 ------	UNKNOWN                       
143.2494  68.9934    3.0  55.4    0.2   3.0874   3.8 ------	UNKNOWN                       
100.7812 -29.5439    2.4  48.0 -178.5   2.0560   4.9 ------	UNKNOWN                       
 97.8382  22.3378    2.3  15.0  -79.4   0.9872   4.9 ------	UNKNOWN                       
 71.2333  40.2776    2.1  42.7  -60.8   3.7750   5.5 ------	UNKNOWN                       
 70.3234  12.7402    2.2  41.1 -102.6   4.3506   5.2 ------	UNKNOWN                       

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

Time interval of the image:
-20.884000 19.100000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.7262  21.8781    6.7  27.7  -87.8   0.1829   1.7    9.7	Crab                          
150.7317  33.2709    2.2  37.8   44.6   0.7775   5.2 ------	UNKNOWN                       
 99.4212   5.7527    0.8  17.2 -141.8   1.1027  15.3 ------	UNKNOWN                       
 81.4213  65.8749    2.1  53.1  -28.0   1.3701   5.5 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
94.468600 962.827700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6350  22.0253    0.2  22.3  -42.8  35.5011  59.0    0.7	Crab                          
121.5777 -37.2727    3.0  47.7  154.9   7.1830   3.9 ------	UNKNOWN                       
112.4243  44.1202    3.4  40.0   13.3   3.1407   3.4 ------	UNKNOWN                       
108.9840  54.4456    2.5  49.3    6.1   5.6196   4.6 ------	UNKNOWN                       
101.6289 -48.3707    3.8  54.1  177.0   7.1693   3.1 ------	UNKNOWN                       
101.6124 -41.5692    3.9  47.3  176.6   3.6030   3.0 ------	UNKNOWN                       
 96.7306  40.6732    3.6  35.0   -4.8   2.4914   3.2 ------	UNKNOWN                       
 64.7433 -12.4020    2.8  39.0 -119.1   5.5745   4.1 ------	UNKNOWN                       
 61.6653  44.7315    3.9  51.0  -35.2   5.9417   3.0 ------	UNKNOWN