GRB060522: 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: Wed Jan 22 16:09:07 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger211117
======================================================================

  Trigger: 00211117      Segment: 000

  BAT Trigger Time: 169956680   [s; MET]
      Trigger Stop: 169956744   [s; MET]
               UTC: 2006-05-22T02:11:18.792140    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 322.950749367837   Dec: 2.87593922853813  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    13.36
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    13.36

  Analysis Position:   [ source = BAT ]
    RA: 322.950749367837   Dec: 2.87593922853813  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 322.956577961755   Dec: 2.89145191205485  [deg; J2000]  
        { 21h 31m 49.6s , +02d 53' 29.2" }
         +/- 1.48640386183072 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.463445783359746 [arcmin] (formal 1-sigma fit error)
    SNR: 17.2666716352673
 
  Angular difference between the analysis and refined position is 0.994137 arcmin
 
  Partial Coding Fraction: 0.75    [ including projection effects ]

  Duration
     T90: 69.1240000128746 +/- 5.89661600721078
        Measured from: 3.09200000762939
                   to: 72.216000020504     [s; relative to TRIGTIME]
     T50: 42.0640000104904 +/- 9.0776994944415
        Measured from: 16.7960000038147
                   to: 58.8600000143051     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 4.40799999237061     
                   to: 5.40799999237061     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.164000004529953     
                   to: 77.3280000090599     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.456651   0.742537   0.443528   0.110681
           0.049265   0.052034   0.047935   0.048128 [error]
 Peak      0.019105   0.027572   0.010208   0.007058
           0.005838   0.006116   0.005385   0.005386 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   77.164    0.164   77.328
T90    69.124    3.092   72.216
T50    42.064   16.796   58.860
Peak    1.000    4.408    5.408
 
 
====== 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      -1.537    -0.151      0.149       -           -               -         1.55e-03     -1.39e-04          1.39e-04      65.740   57
CPL     -0.699    -0.688      0.837       73.310     -16.817       110.885      4.27e-03     -2.38e-03          7.39e-03      61.300   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      -1.927     -0.525     0.461       -           -               -         3.70e-03     -1.30e-03          1.24e-03      45.930   57
CPL      0.206     -2.210     4.429       40.194     -40.194       -40.194      7.09e-02     -7.09e-02          3.19e+01      43.970   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   1.58e-07  2.84e-07  3.92e-07  1.12e-06  1.13e-06  1.96e-06   erg/cm2
      90%_error_low -2.19e-08 -2.49e-08 -4.63e-08 -2.56e-07 -1.10e-07 -2.99e-07   erg/cm2
      90%_error_hi   2.26e-08  2.49e-08  4.63e-08  3.03e-07  1.12e-07  3.37e-07   erg/cm2
Peak flux       PL   2.30e-01  1.80e-01  9.47e-02  7.22e-02  5.38e-01  5.77e-01   ph/cm2/s
      90%_error_low -8.25e-02 -4.93e-02 -4.07e-02 -4.54e-02 -1.47e-01 -1.60e-01   ph/cm2/s
      90%_error_hi   8.73e-02  4.93e-02  4.28e-02  7.62e-02  1.47e-01  1.62e-01   ph/cm2/s
 
Fluence        CPL   1.40e-07  3.10e-07  3.99e-07  3.46e-07  1.04e-06  1.20e-06   erg/cm2
      90%_error_low -2.65e-08 -3.28e-08 -5.24e-08 -2.00e-07 -1.29e-07 -2.37e-07   erg/cm2
      90%_error_hi   2.69e-08  3.42e-08  5.18e-08  5.28e-07  1.32e-07  5.31e-07   erg/cm2
Peak flux      CPL   1.93e-01  2.29e-01  8.02e-02  5.32e-03  5.08e-01  5.08e-01   ph/cm2/s
      90%_error_low -1.93e-01 -7.61e-02 -5.08e-02 -5.32e-03 -1.45e-01 -1.45e-01   ph/cm2/s
      90%_error_hi   1.01e-01  7.77e-02  5.43e-02  8.49e-02  1.48e-01  1.51e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  322.9566     2.8915   0.0111    31.8761   177.1278         1.8654981     17.267 TRIG_00211117                 
 
Foreground time interval of the image:
  0.164  73.101 (delta_t =  72.937 [sec])
Background time interval of the image:
-239.000   0.164 (delta_t = 239.164 [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    0.164 sec. to   77.328 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.53701     ( -0.150573   0.148746 )
Norm@50keV  : 1.55070E-03    ( -0.000139417   0.000138496 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.74 using 59 PHA bins.
# Reduced chi-squared =          1.153 for     57 degrees of freedom 
# Null hypothesis probability =   1.998362e-01
 
Photon flux (15-150 keV)    in 77.16 sec: 0.195584 ( -0.016894  0.01691 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.12871e-06 ( -1.10491e-07  1.11975e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.164 sec. to   77.328 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.698635     ( -0.688198   0.837219 )
Epeak [keV] : 73.3104      ( -16.8143 110.887 )
Norm@50keV  : 4.27218E-03    ( -0.00238145   0.00739319 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.30 using 59 PHA bins.
# Reduced chi-squared =          1.095 for     56 degrees of freedom 
# Null hypothesis probability =   2.916255e-01
 
Photon flux (15-150 keV)    in 77.16 sec: 0.187935 ( -0.018158  0.01806 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.04287e-06 ( -1.28922e-07  1.31626e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    4.408 sec. to    5.408 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.92669     ( -0.525245   0.4612 )
Norm@50keV  : 3.70260E-03    ( -0.00129636   0.00124296 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.93 using 59 PHA bins.
# Reduced chi-squared =         0.8058 for     57 degrees of freedom 
# Null hypothesis probability =   8.528986e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.537521 ( -0.14656  0.14656 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.40604e-08 ( -1.10793e-08  1.17454e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    4.408 sec. to    5.408 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.206253     ( -2.34068   4.29849 )
Epeak [keV] : 40.1944      ( -40.0091 -40.0091 )
Norm@50keV  : 7.08762E-02    ( -0.0924895   31.8611 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.97 using 59 PHA bins.
# Reduced chi-squared =         0.7852 for     56 degrees of freedom 
# Null hypothesis probability =   8.781263e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.508090 ( -0.144975  0.147808 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.82273e-08 ( -8.95604e-09  1.26178e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 69.124 sec.
Hardness ratio (energy fluence ratio) = 1.37847829139

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

S(15-50 keV)  = 4.423427e-07
S(50-150 keV) = 6.863775e-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 = -6.210847846077263E-01, IMY = -3.116077551905699E-02

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:
-239.000000 0.164000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.4426 -39.8369    2.4  29.3   71.4   1.2879   4.8 ------	UNKNOWN                       
323.4684   3.5706    2.8  32.4  178.4   0.7951   4.1 ------	UNKNOWN                       
344.6202 -22.2876    3.2  12.8  -98.6   0.6362   3.6 ------	UNKNOWN                       

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

Time interval of the image:
0.164000 73.100600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
322.9566   2.8915    0.7  31.9  177.1   1.8655  17.3 ------	UNKNOWN                       
339.8633  20.7092    2.8  49.1 -156.0   0.8951   4.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
125.900600 963.092000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
288.7847  10.9329    1.4  34.8  125.8   7.0143   8.2    1.1	GRS 1915+105                  
299.5882  35.2014    0.4  38.9  169.6  21.4959  28.2    0.1	Cyg X-1                       
308.0573  40.9460    1.6  40.4 -176.8   4.5064   7.2    2.4	Cyg X-3                       
326.2253  38.3191    3.6  35.6 -154.9   1.8559   3.2    2.5	Cyg X-2                       
315.6653  37.8487    2.5  35.6 -169.2   2.2795   4.7 ------	UNKNOWN                       
310.1979  58.7630    2.0  56.8 -167.2   9.7141   5.6 ------	UNKNOWN                       
  3.4163  11.3530    4.3  41.0  -83.3   6.3184   2.7 ------	UNKNOWN