GRB070616: 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: Mon Jan 20 08:56:35 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger282445
======================================================================

  Trigger: 00282445      Segment: 000

  BAT Trigger Time: 203704176   [s; MET]
      Trigger Stop: 203704240   [s; MET]
               UTC: 2007-06-16T16:29:33.974040    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 32.1553533187329   Dec: 56.9481781851878  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.92
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    8.92

  Analysis Position:   [ source = BAT ]
    RA: 32.1553533187329   Dec: 56.9481781851878  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 32.0873325021319   Dec: 56.9553496039486  [deg; J2000]  
        { 02h 08m 21.0s , +56d 57' 19.3" }
         +/- 2.60161168691881 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.62368304149754 [arcmin] (formal 1-sigma fit error)
    SNR: 7.76094926712883
 
  Angular difference between the analysis and refined position is 2.266900 arcmin
 
  Partial Coding Fraction: 0.609375    [ including projection effects ]

  Duration
     T90: 406.875999987125 +/- 17.313424148776
        Measured from: 88.580000013113
                   to: 495.456000000238     [s; relative to TRIGTIME]
     T50: 203.879999995232 +/- 5.36175794195104
        Measured from: 160.780000001192
                   to: 364.659999996424     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 139.743999987841     
                   to: 140.743999987841     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -6.52799999713898     
                   to: 602.395999997854     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     9.610418  12.574998   9.055223   2.091862
           0.125655   0.132345   0.120431   0.110638 [error]
 Peak      0.060124   0.087236   0.081495   0.029505
           0.005470   0.006057   0.005867   0.005000 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  608.924   -6.528  602.396
T90   406.876   88.580  495.456
T50   203.880  160.780  364.660
Peak    1.000  139.744  140.744
 
 
====== 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      -1.593    -0.035      0.035       -           -               -         3.45e-03     -5.94e-05          5.94e-05      35.680   57
CPL     -1.471    -0.132      0.142      245.032    -101.298      -245.032      3.90e-03     -4.67e-04          5.88e-04      33.430   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      -1.206     -0.131     0.132       -           -               -         1.64e-02     -1.18e-03          1.18e-03      51.670   57
CPL     -1.207     -0.127     0.137     9999.360    -9999.360      -9999.360      1.64e-02     -1.15e-03          5.82e-03      51.700   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   2.93e-06  5.08e-06  6.74e-06  1.82e-05  1.97e-05  3.30e-05   erg/cm2
      90%_error_low -1.09e-07 -1.08e-07 -1.41e-07 -8.96e-07 -3.45e-07 -9.50e-07   erg/cm2
      90%_error_hi   1.11e-07  1.07e-07  1.41e-07  9.29e-07  3.45e-07  9.73e-07   erg/cm2
Peak flux       PL   5.08e-01  6.10e-01  5.28e-01  7.83e-01  1.92e+00  2.43e+00   ph/cm2/s
      90%_error_low -6.90e-02 -5.05e-02 -4.67e-02 -1.40e-01 -1.40e-01 -1.90e-01   ph/cm2/s
      90%_error_hi   7.18e-02  4.99e-02  4.62e-02  1.58e-01  1.40e-01  1.94e-01   ph/cm2/s
 
Fluence        CPL   2.83e-06  5.10e-06  6.80e-06  1.56e-05  1.95e-05  3.03e-05   erg/cm2
      90%_error_low -1.50e-07 -1.11e-07 -1.57e-07 -2.49e-06 -3.99e-07 -2.53e-06   erg/cm2
      90%_error_hi   1.53e-07  1.11e-07  1.58e-07  2.68e-06  2.00e-07  2.89e-06   erg/cm2
Peak flux      CPL   5.08e-01  6.10e-01  5.29e-01  7.79e-01  1.92e+00  2.43e+00   ph/cm2/s
      90%_error_low     N/A       N/A       N/A       N/A   -1.40e-01     N/A     ph/cm2/s
      90%_error_hi      N/A       N/A       N/A       N/A    1.40e-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
   32.0873    56.9553   0.0249    26.5741   -64.4708         1.1612474      7.761 TRIG_00282445                 
 
Foreground time interval of the image:
 -6.528  72.701 (delta_t =  79.229 [sec])
Background time interval of the image:
-72.099 -12.640 (delta_t =  59.459 [sec])
-12.000  -6.528 (delta_t =   5.472 [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   -6.528 sec. to  602.396 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.59279     ( -0.0348039   0.0348116 )
Norm@50keV  : 3.45150E-03    ( -5.94145e-05   5.94104e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          35.68 using 59 PHA bins.
# Reduced chi-squared =         0.6260 for     57 degrees of freedom 
# Null hypothesis probability =   9.879358e-01
 
Photon flux (15-150 keV)    in 608.9 sec: 0.442563 ( -0.009135  0.009176 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.96746e-05 ( -3.44856e-07  3.45494e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -6.528 sec. to  602.396 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.47135     ( -0.13195   0.141823 )
Epeak [keV] : 245.032      ( -101.299 -245.033 )
Norm@50keV  : 3.90457E-03    ( -0.00046737   0.000587946 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          33.43 using 59 PHA bins.
# Reduced chi-squared =         0.5970 for     56 degrees of freedom 
# Null hypothesis probability =   9.928183e-01
 
Photon flux (15-150 keV)    in 608.9 sec: 0.437264 ( -0.01077  0.010845 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.94942e-05 ( -3.994e-07  1.99854e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from  139.744 sec. to  140.744 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.20597     ( -0.131122   0.131823 )
Norm@50keV  : 1.63617E-02    ( -0.00118001   0.00117857 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.67 using 59 PHA bins.
# Reduced chi-squared =         0.9064 for     57 degrees of freedom 
# Null hypothesis probability =   6.747529e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.92217 ( -0.13994  0.1401 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.65737e-07 ( -1.38012e-08  1.39183e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  139.744 sec. to  140.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.20659     ( -0.127619   0.137102 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 1.64048E-02    ( -0.00118035   0.00579167 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.70 using 59 PHA bins.
# Reduced chi-squared =         0.9232 for     56 degrees of freedom 
# Null hypothesis probability =   6.382355e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.92183 ( -0.14  0.14002 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.5437e-08 ( -4.48397e-09  4.2253e-09 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 406.876 sec.
Hardness ratio (energy fluence ratio) = 1.3261419525

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

S(15-50 keV)  = 8.011601e-06
S(50-150 keV) = 1.1663172e-05

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 = 2.155705603579598E-01, IMY = 4.513608476810955E-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:
-72.099400 -12.640000
-12.000000 -6.528000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.6007  35.1865    1.7  38.3   84.5   2.0448   6.8    1.0	Cyg X-1                       
308.0093  41.0477    8.3  30.4   77.7   0.1848   1.4    7.3	Cyg X-3                       
326.2536  38.1960    5.2  29.3   48.8   0.2601   2.2    8.5	Cyg X-2                       
154.0719  63.2077    2.1  50.0 -147.3   1.1689   5.6 ------	UNKNOWN                       

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

Time interval of the image:
-6.528000 72.700590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5741  35.2888    7.0  38.2   84.6  -0.7692  -1.6    5.3	Cyg X-1                       
308.0897  40.8970    6.9  30.5   77.5   0.3451   1.7    3.5	Cyg X-3                       
326.2836  38.3905    5.6  29.1   48.8   0.3728   2.0    6.7	Cyg X-2                       
295.1181  47.8954    2.3  28.6  100.8   0.9758   5.0 ------	UNKNOWN                       
316.0377  42.8296    2.4  26.6   67.3   0.8345   4.9 ------	UNKNOWN                       
359.4151  77.4564    2.7  12.5 -126.9   0.4637   4.2 ------	UNKNOWN                       
 32.0873  56.9554    1.5  26.6  -64.5   1.1615   7.7 ------	UNKNOWN                       
 45.1369  47.9841    2.2  38.5  -64.8   1.3689   5.4 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
120.100590 963.083500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
  4.5640  34.7136    2.5  29.0   32.7   2.6783   4.7 ------	UNKNOWN                       
 32.1455  56.9444    0.2   0.0  -93.1  31.7945  61.9 ------	UNKNOWN                       
 29.2831  22.8374    2.2  34.2  -14.3   2.7775   5.1 ------	UNKNOWN                       
156.9474  55.4774    4.1  59.1 -166.1  10.9257   2.8 ------	UNKNOWN                       
133.7938  60.4484    3.0  47.6 -158.1   3.8949   3.9 ------	UNKNOWN                       
 57.0172  13.9743    5.2  47.0  -53.0   8.2170   3.1 ------	UNKNOWN                       
 57.1927  13.8575    5.8  47.1  -53.1   8.5901   3.2 ------	UNKNOWN