GRB060202: 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 18:43:42 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger179968
======================================================================

  Trigger: 00179968      Segment: 000

  BAT Trigger Time: 160562456   [s; MET]
      Trigger Stop: 160562520   [s; MET]
               UTC: 2006-02-02T08:40:55.008460    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 35.8433696212598   Dec: 38.3619559368161  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7

  Analysis Position:   [ source = BAT ]
    RA: 35.8433696212598   Dec: 38.3619559368161  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 35.8104023365438   Dec: 38.3745523485316  [deg; J2000]  
        { 02h 23m 14.5s , +38d 22' 28.4" }
         +/- 2.01669092120123 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.981031918932514 [arcmin] (formal 1-sigma fit error)
    SNR: 11.1665578013483
 
  Angular difference between the analysis and refined position is 1.725214 arcmin
 
  Partial Coding Fraction: 0.609375    [ including projection effects ]

  Duration
     T90: 192.876000016928 +/- 22.9389619670661
        Measured from: -16.3240000009537
                   to: 176.552000015974     [s; relative to TRIGTIME]
     T50: 126.880000025034 +/- 13.0830027132744
        Measured from: 4.1879999935627
                   to: 131.068000018597     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -6.44800001382828     
                   to: -5.44800001382828     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -26.4480000138283     
                   to: 190.560000002384     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.342907   1.373116   0.931800   0.266581
           0.080470   0.083342   0.072355   0.061998 [error]
 Peak      0.020556   0.014576   0.019394   0.009853
           0.006215   0.006610   0.005745   0.004808 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  217.008  -26.448  190.560
T90   192.876  -16.324  176.552
T50   126.880    4.188  131.068
Peak    1.000   -6.448   -5.448
 
 
====== 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      -1.769    -0.126      0.124       -           -               -         1.11e-03     -8.10e-05          8.00e-05      59.750   57
CPL     -1.766    -0.129      0.214     9999.040    -9999.030      -9999.040      1.11e-03     -2.50e-04          5.21e-04      59.750   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      -1.375     -0.644     0.688       -           -               -         4.36e-03     -1.31e-03          1.29e-03      39.070   57
CPL     -1.388     -0.633     0.708     9999.360    -9999.360      -9999.360      4.37e-03     -1.31e-03          6.03e-03      39.090   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   3.97e-07  6.19e-07  7.26e-07  1.65e-06  2.22e-06  3.39e-06   erg/cm2
      90%_error_low -4.21e-08 -4.07e-08 -7.26e-08 -3.23e-07 -1.66e-07 -3.91e-07   erg/cm2
      90%_error_hi   4.33e-08  4.07e-08  7.28e-08  3.73e-07  1.68e-07  4.30e-07   erg/cm2
Peak flux       PL   1.59e-01  1.73e-01  1.33e-01  1.68e-01  5.28e-01  6.33e-01   ph/cm2/s
      90%_error_low -1.59e-01 -6.76e-02 -5.25e-02 -1.09e-01 -1.68e-01 -1.90e-01   ph/cm2/s
      90%_error_hi   1.08e-01  5.93e-02  4.76e-02  2.00e-01  1.67e-01  1.94e-01   ph/cm2/s
 
Fluence        CPL   3.99e-07  6.15e-07  7.25e-07  1.88e-06  2.25e-06  3.38e-06   erg/cm2
      90%_error_low -5.03e-08 -4.20e-08    N/A       N/A    -1.93e-07 -7.23e-07   erg/cm2
      90%_error_hi   4.59e-08  2.61e-08    N/A       N/A     1.43e-07  4.14e-07   erg/cm2
Peak flux      CPL   1.42e-01  6.81e-02  2.07e-02  7.90e-03  2.36e-01  2.45e-01   ph/cm2/s
      90%_error_low -1.18e-01 -6.81e-02 -2.07e-02 -7.90e-03 -2.36e-01     N/A     ph/cm2/s
      90%_error_hi   1.20e-01  1.00e-01  1.35e-01  7.32e-02  2.99e-01     N/A     ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   35.8104    38.3746   0.0172    38.1368  -155.9733         1.4640845     11.167 TRIG_00179968                 
 
Foreground time interval of the image:
-26.448  72.501 (delta_t =  98.949 [sec])
Background time interval of the image:
-299.000 -26.448 (delta_t = 272.552 [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  -26.448 sec. to  190.560 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.76925     ( -0.126297   0.123938 )
Norm@50keV  : 1.11173E-03    ( -8.10068e-05   8.00421e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.75 using 59 PHA bins.
# Reduced chi-squared =          1.048 for     57 degrees of freedom 
# Null hypothesis probability =   3.761992e-01
 
Photon flux (15-150 keV)    in 217 sec: 0.151414 ( -0.010098  0.010116 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.22412e-06 ( -1.66478e-07  1.68148e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -26.448 sec. to  190.560 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.76599     ( -0.127922   0.215093 )
Epeak [keV] : 9999.04      ( -9999.34 -9999.35 )
Norm@50keV  : 1.11352E-03    ( -0.000249922   0.0005215 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.75 using 59 PHA bins.
# Reduced chi-squared =          1.067 for     56 degrees of freedom 
# Null hypothesis probability =   3.410238e-01
 
Photon flux (15-150 keV)    in 217 sec: 0.152440 ( -0.011176  0.009129 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.24667e-06 ( -1.92811e-07  1.42794e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -6.448 sec. to   -5.448 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.37532     ( -0.645078   0.687551 )
Norm@50keV  : 4.36194E-03    ( -0.00130536   0.00129368 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.07 using 59 PHA bins.
# Reduced chi-squared =         0.6855 for     57 degrees of freedom 
# Null hypothesis probability =   9.665416e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.528198 ( -0.167793  0.166819 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.23838e-08 ( -1.41142e-08  1.4145e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -6.448 sec. to   -5.448 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.38793     ( -0.633926   0.707237 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 4.37267E-03    ( -0.00131048   0.00602947 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.09 using 59 PHA bins.
# Reduced chi-squared =         0.6980 for     56 degrees of freedom 
# Null hypothesis probability =   9.582131e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.236495 ( -0.236495  0.299366 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.11033e-08 ( -1.86519e-08  2.08321e-07 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 192.876 sec.
Hardness ratio (energy fluence ratio) = 1.17346444055

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

S(15-50 keV)  = 1.0158285e-06
S(50-150 keV) = 1.2083148e-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 = -7.171113790294807E-01, IMY = 3.196790061159926E-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:
-299.000000 -26.448000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6312  22.0049    0.8  47.9  139.0  11.3901  13.7    0.6	Crab                          
259.7589  67.5022    3.2  42.8  -34.4   1.1076   3.7 ------	UNKNOWN                       
 19.8806  25.3638    4.2  55.2 -145.1   3.1048   2.8 ------	UNKNOWN                       
274.5955  58.8841    3.8  50.8  -44.4   2.9640   3.1 ------	UNKNOWN                       

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

Time interval of the image:
-26.448000 72.500610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.5559  21.9800    7.4  47.9  139.0  -0.7593  -1.6    4.8	Crab                          
219.0224  78.9231    2.3  29.8  -19.1   0.5416   4.9 ------	UNKNOWN                       
226.2797  60.7993    2.2  47.7  -13.1   0.9410   5.2 ------	UNKNOWN                       
 35.8103  38.3746    1.0  38.1 -156.0   1.4643  11.2 ------	UNKNOWN                       
246.1223  58.9720    2.2  51.1  -25.6   1.3587   5.2 ------	UNKNOWN                       
 21.6563  29.6088    2.2  50.6 -145.0   1.5768   5.1 ------	UNKNOWN                       
  7.2129  40.1727    2.4  45.9 -124.7   1.9771   4.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
131.900600 303.103100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 49.0520  18.9865    2.6  22.5  164.9   0.5775   4.4 ------	UNKNOWN                       
 35.8750  38.3714    0.9   0.0   98.7   1.5166  12.6 ------	UNKNOWN                       
307.5034  60.7744    2.8  56.4  -16.5   2.1114   4.1 ------	UNKNOWN                       
328.1237  41.4220    3.6  50.7  -44.4   2.0411   3.2 ------	UNKNOWN