GRB050712: 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 21:46:50 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger145581
======================================================================

  Trigger: 00145581      Segment: 000

  BAT Trigger Time: 142869627.136   [s; MET]
      Trigger Stop: 142869654.016   [s; MET]
               UTC: 2005-07-12T14:00:27.517820    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 77.6928992397336   Dec: 64.898850024641  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.89
     Image Trigger?:     NO
     Rate S/N Ratio:     11.7898261225516  [ if not an image trigger ]
     Image S/N Ratio:    8.89

  Analysis Position:   [ source = BAT ]
    RA: 77.6928992397336   Dec: 64.898850024641  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 77.7221924188025   Dec: 64.9273059944435  [deg; J2000]  
        { 05h 10m 53.3s , +64d 55' 38.3" }
         +/- 1.69697651428425 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.74800414987494 [arcmin] (formal 1-sigma fit error)
    SNR: 14.2892702092692
 
  Angular difference between the analysis and refined position is 1.862902 arcmin
 
  Partial Coding Fraction: 0.46875    [ including projection effects ]

  Duration
     T90: 51.3560000061989 +/- 7.86838358834463
        Measured from: -12.9839999973774
                   to: 38.3720000088215     [s; relative to TRIGTIME]
     T50: 26.9280000030994 +/- 6.96220945189602
        Measured from: -1.95600000023842
                   to: 24.972000002861     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 17.3879999816418     
                   to: 18.3879999816418     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -20.444000005722     
                   to: 40.1239999830723     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.403036   0.634953   0.475121   0.119167
           0.052820   0.055280   0.049318   0.043393 [error]
 Peak      0.022065   0.026576   0.011826   0.010359
           0.006927   0.006970   0.006228   0.005321 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   60.568  -20.444   40.124
T90    51.356  -12.984   38.372
T50    26.928   -1.956   24.972
Peak    1.000   17.388   18.388
 
 
====== 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      -1.496    -0.177      0.176       -           -               -         1.90e-03     -1.90e-04          1.89e-04      57.800   57
CPL     -1.448    -1.298      0.579      584.950    -584.950      -584.950      2.00e-03        N/A               N/A         57.840   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      -2.001     -0.635     0.539       -           -               -         3.68e-03     -1.54e-03          1.48e-03      68.020   57
CPL     -0.333     -1.795     0.333       37.997      N/A           N/A         3.86e-02        N/A               N/A         66.860   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   1.46e-07  2.69e-07  3.82e-07  1.14e-06  1.09e-06  1.94e-06   erg/cm2
      90%_error_low -2.48e-08 -2.83e-08 -4.97e-08 -2.91e-07 -1.19e-07 -3.33e-07   erg/cm2
      90%_error_hi   2.59e-08  2.80e-08  4.92e-08  3.53e-07  1.20e-07  3.83e-07   erg/cm2
Peak flux       PL   2.46e-01  1.84e-01  9.19e-02  6.56e-02  5.52e-01  5.87e-01   ph/cm2/s
      90%_error_low -5.71e-02 -6.06e-02 -2.63e-02 -6.56e-02 -1.81e-01 -1.94e-01   ph/cm2/s
      90%_error_hi   1.11e-01  6.05e-02  4.95e-02  8.42e-02  1.81e-01  1.95e-01   ph/cm2/s
 
Fluence        CPL   1.47e-07  2.69e-07  3.81e-07  1.17e-06  1.09e-06  1.93e-06   erg/cm2
      90%_error_low -2.66e-08 -2.76e-08 -4.99e-08 -7.14e-07 -1.30e-07 -6.73e-07   erg/cm2
      90%_error_hi   2.38e-08  3.35e-08  5.47e-08  1.65e-08  1.01e-07  2.00e-07   erg/cm2
Peak flux      CPL   2.22e-01  2.24e-01  7.88e-02  7.48e-03  5.32e-01  5.33e-01   ph/cm2/s
      90%_error_low -2.22e-01 -8.55e-02 -7.88e-02 -7.48e-03 -2.05e-01 -2.05e-01   ph/cm2/s
      90%_error_hi   1.19e-01  1.17e-01  6.57e-02  8.40e-02  1.84e-01  2.02e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   77.7222    64.9273   0.0134    38.3947  -141.0804         1.7209023     14.289 TRIG_00145581                 
 
Foreground time interval of the image:
-20.444  40.124 (delta_t =  60.568 [sec])
Background time interval of the image:
-299.136 -20.444 (delta_t = 278.692 [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  -20.444 sec. to   40.124 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.49638     ( -0.17681   0.175702 )
Norm@50keV  : 1.89709E-03    ( -0.000190186   0.000189299 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.80 using 59 PHA bins.
# Reduced chi-squared =          1.014 for     57 degrees of freedom 
# Null hypothesis probability =   4.454281e-01
 
Photon flux (15-150 keV)    in 60.57 sec: 0.236607 ( -0.023919  0.02398 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.09085e-06 ( -1.19187e-07  1.201e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -20.444 sec. to   40.124 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.49374     ( -1.26079   0.616355 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 1.90287E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.80 using 59 PHA bins.
# Reduced chi-squared =          1.032 for     56 degrees of freedom 
# Null hypothesis probability =   4.084649e-01
 
Photon flux (15-150 keV)    in 60.57 sec: 0.236890 ( -0.024566  0.024007 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.09284e-06 ( -1.30236e-07  1.01416e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   17.388 sec. to   18.388 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.00149     ( -0.635481   0.537988 )
Norm@50keV  : 3.67768E-03    ( -0.00153992   0.00147723 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.02 using 59 PHA bins.
# Reduced chi-squared =          1.193 for     57 degrees of freedom 
# Null hypothesis probability =   1.506281e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.552066 ( -0.180732  0.180763 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.39297e-08 ( -1.284e-08  1.3652e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   17.388 sec. to   18.388 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.333077     ( -1.82698   0.300948 )
Epeak [keV] : 37.9970      (   )
Norm@50keV  : 3.85922E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.86 using 59 PHA bins.
# Reduced chi-squared =          1.194 for     56 degrees of freedom 
# Null hypothesis probability =   1.518330e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.531740 ( -0.204529  0.183731 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.89514e-08 ( -1.37515e-08  1.56995e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 51.356 sec.
Hardness ratio (energy fluence ratio) = 1.41778334954

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

S(15-50 keV)  = 4.155216e-07
S(50-150 keV) = 6.753281e-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 = -6.165415413715893E-01, IMY = 4.978340875213606E-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:
-299.136000 -20.444000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
325.0044  63.8838    3.3  49.4  158.3   2.5437   3.5 ------	UNKNOWN                       
340.7965  85.8343    3.0  51.6 -173.0   2.3375   3.8 ------	UNKNOWN                       
 74.6342  20.3574    3.1  38.1  -65.4   2.0123   3.8 ------	UNKNOWN                       

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

Time interval of the image:
-20.444000 40.124000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 37.3452  10.7202    2.2  25.4    5.5   0.4550   5.3 ------	UNKNOWN                       
350.4155  80.7617    2.7  47.7 -177.5   0.6508   4.3 ------	UNKNOWN                       
 30.0142  65.7389    2.4  29.9 -172.7   0.3946   4.9 ------	UNKNOWN                       
 59.4658  85.0970    1.9  49.6 -166.1   0.9466   6.1 ------	UNKNOWN                       
 77.7222  64.9273    0.8  38.4 -141.1   1.7207  14.3 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
149.964600 302.936100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6289  22.0148    0.6  43.0  -53.8   6.1936  19.8    0.2	Crab                          
192.9908  47.5057    3.4  57.0 -178.9   2.2795   3.4 ------	UNKNOWN                       
 63.3757  22.3059    2.4  43.6  -26.3   0.8893   4.8 ------	UNKNOWN                       
179.6562  39.8505    3.3  59.2 -164.7   2.9796   3.5 ------	UNKNOWN                       
100.5050  42.4310    2.4  25.9  -86.7   0.7420   4.9 ------	UNKNOWN