GRB080319D: 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 03:34:57 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger306793
======================================================================

  Trigger: 00306793      Segment: 000

  BAT Trigger Time: 227639112   [s; MET]
      Trigger Stop: 227639176   [s; MET]
               UTC: 2008-03-19T17:05:09.345180    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 99.4803719736166   Dec: 23.9335194811168  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.22
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.22

  Analysis Position:   [ source = BAT ]
    RA: 99.4803719736166   Dec: 23.9335194811168  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 99.4792769236431   Dec: 23.9837185697156  [deg; J2000]  
        { 06h 37m 55.0s , +23d 59' 01.4" }
         +/- 2.54261148763677 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.15092045085236 [arcmin] (formal 1-sigma fit error)
    SNR: 8.01949358880981
 
  Angular difference between the analysis and refined position is 3.012544 arcmin
 
  Partial Coding Fraction: 0.59375    [ including projection effects ]

  Duration
     T90: 26.9400000274181 +/- 4.47841399106537
        Measured from: 7.23199999332428
                   to: 34.1720000207424     [s; relative to TRIGTIME]
     T50: 15.6879999935627 +/- 5.20474861129683
        Measured from: 13.080000013113
                   to: 28.7680000066757     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 33.5699999928474     
                   to: 34.5699999928474     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 4.9839999973774     
                   to: 34.4760000109673     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.178881   0.258750   0.084364   0.049669
           0.034188   0.036473   0.034847   0.037458 [error]
 Peak      0.019970   0.017432   0.007569   0.004194
           0.006370   0.006802   0.006449   0.007061 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   29.492    4.984   34.476
T90    26.940    7.232   34.172
T50    15.688   13.080   28.768
Peak    1.000   33.570   34.570
 
 
====== 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      -1.791    -0.352      0.331       -           -               -         1.19e-03     -2.79e-04          2.72e-04      57.720   57
CPL      0.490    -2.310      4.935       39.067      -8.208      2896.193      3.26e-02     -3.26e-02          5.03e+01      55.010   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      -1.721     -0.973     0.830       -           -               -         3.06e-03     -1.65e-03          1.47e-03      41.230   57
CPL     -1.737     -2.606     3.967     9999.000      N/A           N/A         3.03e-03        N/A               N/A         41.230   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   5.89e-08  9.07e-08  1.05e-07  2.32e-07  3.23e-07  4.87e-07   erg/cm2
      90%_error_low -1.53e-08 -1.73e-08 -3.20e-08 -1.15e-07 -7.51e-08 -1.56e-07   erg/cm2
      90%_error_hi   1.59e-08  1.73e-08  3.35e-08  1.76e-07  7.88e-08  2.06e-07   erg/cm2
Peak flux       PL   1.56e-01  1.38e-01  8.36e-02  7.67e-02  4.10e-01  4.54e-01   ph/cm2/s
      90%_error_low -9.33e-02 -5.73e-02 -5.39e-02 -7.67e-02 -1.70e-01 -1.94e-01   ph/cm2/s
      90%_error_hi   1.05e-01  5.71e-02  5.60e-02  1.59e-01  1.70e-01  2.02e-01   ph/cm2/s
 
Fluence        CPL   5.32e-08  1.17e-07  6.10e-08  3.94e-09  2.35e-07  2.35e-07   erg/cm2
      90%_error_low -1.83e-08 -3.14e-08 -4.31e-08    N/A    -6.02e-08 -6.10e-08   erg/cm2
      90%_error_hi   1.79e-08  2.93e-08  6.22e-08    N/A     1.13e-07  2.55e-07   erg/cm2
Peak flux      CPL   1.60e-01  1.37e-01  8.23e-02  7.75e-02  4.11e-01  4.53e-01   ph/cm2/s
      90%_error_low -1.01e-01 -5.62e-02 -5.27e-02 -7.75e-02 -1.71e-01 -2.09e-01   ph/cm2/s
      90%_error_hi   1.02e-01  7.24e-02  5.79e-02  1.57e-01  1.69e-01  1.88e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   99.4793    23.9837   0.0241    33.9137  -141.3578         0.6011024      8.019 TRIG_00306793                 
 
Foreground time interval of the image:
  4.984  34.476 (delta_t =  29.492 [sec])
Background time interval of the image:
-239.000   4.984 (delta_t = 243.984 [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    4.984 sec. to   34.476 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.79148     ( -0.351569   0.330495 )
Norm@50keV  : 1.18936E-03    ( -0.000279143   0.000271477 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.72 using 59 PHA bins.
# Reduced chi-squared =          1.013 for     57 degrees of freedom 
# Null hypothesis probability =   4.485138e-01
 
Photon flux (15-150 keV)    in 29.49 sec: 0.163362 ( -0.031099  0.031099 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.23054e-07 ( -7.51208e-08  7.88058e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    4.984 sec. to   34.476 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.734729     ( -2.34146   4.90323 )
Epeak [keV] : 38.5378      ( -7.89812 2896.5 )
Norm@50keV  : 4.63414E-02    ( -0.0518332   50.3283 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.97 using 59 PHA bins.
# Reduced chi-squared =         0.9816 for     56 degrees of freedom 
# Null hypothesis probability =   5.138205e-01
 
Photon flux (15-150 keV)    in 29.49 sec: 0.148825 ( -0.031269  0.033653 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.34696e-07 ( -6.02401e-08  1.12981e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   33.570 sec. to   34.570 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.72093     ( -0.972747   0.829941 )
Norm@50keV  : 3.06438E-03    ( -0.00164877   0.00147359 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.23 using 59 PHA bins.
# Reduced chi-squared =         0.7233 for     57 degrees of freedom 
# Null hypothesis probability =   9.425664e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.410023 ( -0.169818  0.169825 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.83322e-08 ( -1.42085e-08  1.56463e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   33.570 sec. to   34.570 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.54627     ( -1.79814   4.77526 )
Epeak [keV] : 184.658      (   )
Norm@50keV  : 1.12756E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.17 using 59 PHA bins.
# Reduced chi-squared =         0.7353 for     56 degrees of freedom 
# Null hypothesis probability =   9.310211e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.410849 ( -0.170975  0.168991 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.80537e-08 ( -1.39072e-08  1.56794e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 26.94 sec.
Hardness ratio (energy fluence ratio) = 1.15557969676

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

S(15-50 keV)  = 1.4958918e-07
S(50-150 keV) = 1.734669e-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 = -5.251212045229291E-01, IMY = 4.198328824921220E-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:
-239.000000 4.984000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6291  22.0048    0.9  47.7 -133.5   9.4135  12.4    0.6	Crab                          
149.8294  68.1595    2.4  33.8  -33.5   1.1359   4.8 ------	UNKNOWN                       

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

Time interval of the image:
4.984000 34.476000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6303  21.9694    5.6  47.8 -133.6   0.4368   2.1    2.7	Crab                          
 99.4793  23.9838    1.4  33.9 -141.4   0.6011   8.0 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
131.300610 963.062800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6311  22.0156    0.2  14.7  -98.0  35.9421  68.2    0.1	Crab                          
154.1096  57.3983    4.1  51.2   30.7   7.6600   2.8 ------	UNKNOWN                       
143.2827  61.8194    2.4  48.0   22.4   6.5973   4.8 ------	UNKNOWN                       
104.4671  -7.1867    2.1  31.5  166.9   3.8511   5.5 ------	UNKNOWN                       
129.6443  78.9924    2.9  56.7    2.9  11.9078   4.0 ------	UNKNOWN                       
100.8891  71.1204    3.2  47.2   -3.0   3.9870   3.7 ------	UNKNOWN                       
 81.6509 -32.5673    4.1  59.0 -166.1  10.0357   2.8 ------	UNKNOWN                       
 43.5969  52.2884    4.0  50.6  -44.6   8.8059   2.9 ------	UNKNOWN                       
 45.9147  47.8742    3.0  48.3  -49.9  10.7564   3.8 ------	UNKNOWN