GRB060712: 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: Sat May  9 19:42:43 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger218582
======================================================================

  Trigger: 00218582      Segment: 000

  BAT Trigger Time: 174431265.024   [s; MET]
      Trigger Stop: 174431291.904   [s; MET]
               UTC: 2006-07-12T21:07:43.711080    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 184.061047100022   Dec: 35.5596913631098  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.67
     Image Trigger?:     NO
     Rate S/N Ratio:     10.3923048454133  [ if not an image trigger ]
     Image S/N Ratio:    6.67

  Analysis Position:   [ source = BAT ]
    RA: 184.061047100022   Dec: 35.5596913631098  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 184.062138125809   Dec: 35.5481500472195  [deg; J2000]  
        { 12h 16m 14.9s , +35d 32' 53.3" }
         +/- 2.37215949182318 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.1859363488358 [arcmin] (formal 1-sigma fit error)
    SNR: 8.85520345110734
 
  Angular difference between the analysis and refined position is 0.694524 arcmin
 
  Partial Coding Fraction: 0.09570312    [ including projection effects ]

  Duration
     T90: 30.9120000004768 +/- 6.63041235721911
        Measured from: 2.83200001716614
                   to: 33.744000017643     [s; relative to TRIGTIME]
     T50: 13.7599999904633 +/- 7.10515306344147
        Measured from: 12.4960000216961
                   to: 26.2560000121593     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 16.7639999985695     
                   to: 17.7639999985695     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.592000007629395     
                   to: 38.7360000014305     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.620259   0.727489   0.487346   0.208240
           0.113049   0.118332   0.103771   0.088533 [error]
 Peak      0.077845   0.042344   0.061181   0.026251
           0.018959   0.018811   0.017213   0.014988 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   38.144    0.592   38.736
T90    30.912    2.832   33.744
T50    13.760   12.496   26.256
Peak    1.000   16.764   17.764
 
 
====== 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      -1.557    -0.320      0.323       -           -               -         3.95e-03     -6.70e-04          6.70e-04      57.980   57
CPL     -1.573    -0.305      0.343     9999.360    -9999.360      -9999.360      3.96e-03     -6.69e-04          3.20e-03      58.000   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      -1.916     -0.682     0.567       -           -               -         1.11e-02     -4.12e-03          3.87e-03      83.010   57
CPL     -1.862     -2.540     2.417      143.155      N/A           N/A         1.17e-02        N/A               N/A         83.010   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   2.03e-07  3.60e-07  4.89e-07  1.37e-06  1.42e-06  2.43e-06   erg/cm2
      90%_error_low -6.40e-08 -7.11e-08 -1.05e-07 -5.58e-07 -2.52e-07 -6.42e-07   erg/cm2
      90%_error_hi   7.03e-08  6.86e-08  1.02e-07  7.72e-07  2.52e-07  7.99e-07   erg/cm2
Peak flux       PL   6.80e-01  5.36e-01  2.84e-01  2.19e-01  1.60e+00  1.72e+00   ph/cm2/s
      90%_error_low -3.42e-01 -1.91e-01 -1.32e-01 -1.51e-01 -5.70e-01 -5.80e-01   ph/cm2/s
      90%_error_hi   4.09e-01  1.86e-01  1.23e-01  2.34e-01  5.78e-01  5.84e-01   ph/cm2/s
 
Fluence        CPL   2.14e-07  3.53e-07   N/A     1.36e-06  1.42e-06  2.39e-06   erg/cm2
      90%_error_low -7.50e-08 -6.43e-08 -1.05e-07    N/A    -2.57e-07 -7.94e-07   erg/cm2
      90%_error_hi   5.95e-08  7.54e-08  1.02e-07    N/A     2.57e-07  8.22e-07   erg/cm2
Peak flux      CPL   6.14e-01  4.15e-01  1.93e-01  1.46e-01  1.29e+00  1.38e+00   ph/cm2/s
      90%_error_low     N/A   -4.15e-01 -1.93e-01     N/A       N/A       N/A     ph/cm2/s
      90%_error_hi      N/A    3.29e-01  2.25e-01     N/A       N/A       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
  184.0621    35.5482   0.0217    55.5548    -4.9746         2.2483836      8.855 TRIG_00218582                 
 
Foreground time interval of the image:
  0.592  38.736 (delta_t =  38.144 [sec])
Background time interval of the image:
-239.024   0.592 (delta_t = 239.616 [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    0.592 sec. to   38.736 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.55705     ( -0.319848   0.322745 )
Norm@50keV  : 3.94923E-03    ( -0.000670256   0.000669579 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.98 using 59 PHA bins.
# Reduced chi-squared =          1.017 for     57 degrees of freedom 
# Null hypothesis probability =   4.389729e-01
 
Photon flux (15-150 keV)    in 38.14 sec: 0.500991 ( -0.093783  0.094482 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.41678e-06 ( -2.51521e-07  2.52165e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.592 sec. to   38.736 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.57264     ( -0.305929   0.341516 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 3.95541E-03    ( -0.000669389   0.00319853 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.00 using 59 PHA bins.
# Reduced chi-squared =          1.036 for     56 degrees of freedom 
# Null hypothesis probability =   4.015130e-01
 
Photon flux (15-150 keV)    in 38.14 sec: 0.501196 ( -0.093986  0.094293 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.41684e-06 ( -2.57153e-07  2.57026e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   16.764 sec. to   17.764 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.91586     ( -0.681793   0.567069 )
Norm@50keV  : 1.10708E-02    ( -0.00411583   0.00386888 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          83.01 using 59 PHA bins.
# Reduced chi-squared =          1.456 for     57 degrees of freedom 
# Null hypothesis probability =   1.385796e-02
 
Photon flux (15-150 keV)    in 1 sec: 1.59968 ( -0.57045  0.5777 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.01817e-07 ( -3.56502e-08  3.5774e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   16.764 sec. to   17.764 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.81349     ( -1.57144   3.38515 )
Epeak [keV] : 268.406      (   )
Norm@50keV  : 3.92797E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          82.46 using 59 PHA bins.
# Reduced chi-squared =          1.472 for     56 degrees of freedom 
# Null hypothesis probability =   1.224113e-02
 
Photon flux (15-150 keV)    in 1 sec: 1.28769 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 30.912 sec.
Hardness ratio (energy fluence ratio) = 1.35937767728

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

S(15-50 keV)  = 5.629984e-07
S(50-150 keV) = 8.53774e-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 = 1.452503442940376E+00, IMY = 1.264288181916121E-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:
-239.024000 0.592000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5350 -40.5531    0.9  32.8 -178.2   2.4981  13.1    0.3	Vela X-1                      
170.2654 -60.5567    4.6  47.2  141.2   1.5575   2.5    4.2	Cen X-3                       
186.7422  29.2140    2.5  51.5    1.7   1.9790   4.6 ------	UNKNOWN                       
 99.7367 -48.7220    2.6  58.6 -169.5   4.3964   4.4 ------	UNKNOWN                       
144.8046  34.8111    2.5  50.6  -44.7   4.0874   4.6 ------	UNKNOWN                       

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

Time interval of the image:
0.592000 38.736000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5071 -40.5048 1410.3  32.8 -178.1   0.0005   0.0    3.2	Vela X-1                      
170.1227 -60.7386    6.2  47.3  141.3   0.4303   1.8    9.0	Cen X-3                       
168.7050  15.8056    2.7  31.8  -10.9   0.2788   4.3 ------	UNKNOWN                       
184.0621  35.5482    1.3  55.6   -5.0   2.2484   8.9 ------	UNKNOWN                       
111.1087 -15.3879    3.0  45.3 -128.3   0.6826   3.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
167.476610 723.016000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
178.6277   3.7948    2.7  32.2 -178.5   3.4286   4.2 ------	UNKNOWN                       
178.6121  10.4261    2.5  25.6 -176.3   3.3050   4.5 ------	UNKNOWN                       
167.5008   7.9524    3.2  31.5 -156.1   3.0657   3.6 ------	UNKNOWN                       
163.5129   4.0085    3.0  36.8 -153.0   3.6898   3.9 ------	UNKNOWN                       
155.1942  -2.6856    2.7  46.8 -147.4   7.2720   4.2 ------	UNKNOWN