GRB080411: 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 02:57:27 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger309010
======================================================================

  Trigger: 00309010      Segment: 000

  BAT Trigger Time: 229641335.296   [s; MET]
      Trigger Stop: 229641335.36   [s; MET]
               UTC: 2008-04-11T21:15:32.585440    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 38.0182886268497   Dec: -71.3420191948273  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.14
     Image Trigger?:     NO
     Rate S/N Ratio:     14.3178210632764  [ if not an image trigger ]
     Image S/N Ratio:    8.14

  Analysis Position:   [ source = BAT ]
    RA: 38.0182886268497   Dec: -71.3420191948273  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 37.9612896897009   Dec: -71.2971012249888  [deg; J2000]  
        { 02h 31m 50.7s , -71d 17' 49.6" }
         +/- 0.485111069216351 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.128724523163234 [arcmin] (formal 1-sigma fit error)
    SNR: 85.4902698526476
 
  Angular difference between the analysis and refined position is 2.909172 arcmin
 
  Partial Coding Fraction: 0.8671875    [ including projection effects ]

  Duration
     T90: 56.3280000090599 +/- 0.922752397908764
        Measured from: 4.71999999880791
                   to: 61.0480000078678     [s; relative to TRIGTIME]
     T50: 25.0879999995232 +/- 0.0823650343659764
        Measured from: 17.9239999949932
                   to: 43.0119999945164     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 40.4519999921322     
                   to: 41.4519999921322     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.272000014781952     
                   to: 77.2759999930859     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total    15.069075  17.226665  11.395270   2.715978
           0.068647   0.072991   0.063979   0.049402 [error]
 Peak      1.348448   1.929183   1.410960   0.300256
           0.015259   0.018058   0.016243   0.009547 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   77.548   -0.272   77.276
T90    56.328    4.720   61.048
T50    25.088   17.924   43.012
Peak    1.000   40.452   41.452
 
 
====== 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      -1.684    -0.024      0.024       -           -               -         3.68e-02     -4.74e-04          4.72e-04      29.800   57
CPL     -1.664    -0.043      0.006      998.238    -998.228      -998.238      3.76e-02     -1.12e-03          -2.51e-04      31.700   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      -1.534     -0.030     0.030       -           -               -         3.22e-01     -5.16e-03          5.16e-03      71.830   57
CPL     -1.223     -0.121     0.124      149.110     -25.809        54.921      4.36e-01     -4.71e-02          5.41e-02      51.880   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   4.33e-06  7.12e-06  8.86e-06  2.19e-05  2.65e-05  4.22e-05   erg/cm2
      90%_error_low -1.29e-07 -1.25e-07 -1.09e-07 -6.46e-07 -3.22e-07 -6.46e-07   erg/cm2
      90%_error_hi   1.31e-07  1.25e-07  1.09e-07  6.60e-07  3.22e-07  6.55e-07   erg/cm2
Peak flux       PL   1.37e+01  1.35e+01  9.33e+00  1.02e+01  4.06e+01  4.67e+01   ph/cm2/s
      90%_error_low -4.75e-01 -2.82e-01 -1.61e-01 -3.81e-01 -7.82e-01 -7.63e-01   ph/cm2/s
      90%_error_hi   4.83e-01  2.81e-01  1.61e-01  3.89e-01  7.85e-01  7.64e-01   ph/cm2/s
 
Fluence        CPL   4.33e-06  7.12e-06  8.86e-06  2.18e-05  2.65e-05  4.46e-05   erg/cm2
      90%_error_low -1.29e-07 -1.25e-07 -1.09e-07    N/A    -3.23e-07    N/A      erg/cm2
      90%_error_hi   1.31e-07  1.25e-07  1.09e-07    N/A     3.22e-07    N/A      erg/cm2
Peak flux      CPL   1.24e+01  1.36e+01  9.67e+00  7.90e+00  3.95e+01  4.36e+01   ph/cm2/s
      90%_error_low -6.47e-01 -2.90e-01 -2.04e-01 -7.19e-01 -8.76e-01 -1.25e+00   ph/cm2/s
      90%_error_hi   6.61e-01  2.90e-01  2.05e-01  8.10e-01  8.82e-01  1.31e+00   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   37.9613   -71.2971   0.0022    29.1533  -162.8732         4.7682824     85.490 TRIG_00309010                 
 
Foreground time interval of the image:
 -0.272   9.605 (delta_t =   9.877 [sec])
Background time interval of the image:
-239.296 -177.283 (delta_t =  62.013 [sec])
-119.296  -0.272 (delta_t = 119.024 [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   -0.272 sec. to   77.276 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.68437     ( -0.0238418   0.0239838 )
Norm@50keV  : 3.67948E-02    ( -0.000473709   0.000471994 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          29.80 using 59 PHA bins.
# Reduced chi-squared =         0.5229 for     57 degrees of freedom 
# Null hypothesis probability =   9.988905e-01
 
Photon flux (15-150 keV)    in 77.55 sec: 4.86056 ( -0.0861  0.08665 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.6457e-05 ( -3.22078e-07  3.22423e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.272 sec. to   77.276 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.68239     ( -0.0223323   0.0263118 )
Epeak [keV] : 1.00000E+04      ( -9999.99 -10000 )
Norm@50keV  : 3.68643E-02    ( -0.000435364   0.000435196 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          29.97 using 59 PHA bins.
# Reduced chi-squared =         0.5352 for     56 degrees of freedom 
# Null hypothesis probability =   9.983093e-01
 
Photon flux (15-150 keV)    in 77.55 sec: 4.85932 ( -0.08609  0.08678 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.6454e-05 ( -3.22664e-07  3.22365e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   40.452 sec. to   41.452 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.53419     ( -0.0296656   0.0296983 )
Norm@50keV  : 0.322247    ( -0.00516307   0.00516064 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.83 using 59 PHA bins.
# Reduced chi-squared =          1.260 for     57 degrees of freedom 
# Null hypothesis probability =   8.931898e-02
 
Photon flux (15-150 keV)    in 1 sec: 40.6115 ( -0.7817  0.7845 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.0411e-06 ( -4.8353e-08  4.83417e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   40.452 sec. to   41.452 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.22252     ( -0.121138   0.124313 )
Epeak [keV] : 149.110      ( -25.8091 54.9216 )
Norm@50keV  : 0.435706    ( -0.0470757   0.0540707 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.88 using 59 PHA bins.
# Reduced chi-squared =         0.9265 for     56 degrees of freedom 
# Null hypothesis probability =   6.313722e-01
 
Photon flux (15-150 keV)    in 1 sec: 39.4721 ( -0.8757  0.8817 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.97788e-06 ( 0  0 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 56.328 sec.
Hardness ratio (energy fluence ratio) = 1.24457217622

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

S(15-50 keV)  = 1.1448437e-05
S(50-150 keV) = 1.500867e-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 = -5.330752492201082E-01, IMY = 1.642679042824512E-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:
-239.296000 -177.282900
-119.296000 -0.272000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6017 -40.6155    2.3  29.7   61.1   1.4101   5.1    4.9	Vela X-1                      
170.4405 -60.7496   22.6  37.9  113.2   0.2501   0.5    8.4	Cen X-3                       
115.8915  -3.6317    3.6  53.8    8.2   2.3576   3.2 ------	UNKNOWN                       
 95.8314   1.4747    2.3  56.4  -16.9   3.5180   4.9 ------	UNKNOWN                       
 79.3285 -13.8883    2.9  43.1  -40.7   1.3927   3.9 ------	UNKNOWN                       
 44.1905 -34.0300    3.6  41.1  -98.1   3.1232   3.2 ------	UNKNOWN                       

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

Time interval of the image:
-0.272000 9.604620
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4793 -40.4240    7.7  29.8   60.6   0.1291   1.5    8.2	Vela X-1                      
170.6707 -60.5928    0.0  38.1  113.0  -0.0429  -0.3   10.6	Cen X-3                       
 37.9613 -71.2971    0.1  29.2 -162.9   4.7680  85.6 ------	UNKNOWN                       
 48.6663 -57.8381    2.5  25.8 -132.7   0.2760   4.6 ------	UNKNOWN                       
 47.0122 -54.3766    2.1  27.7 -126.0   0.3541   5.6 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
59.204590 209.804600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.4399 -39.5621    2.6  55.5  175.3   2.9640   4.4 ------	UNKNOWN                       
100.7669 -34.8174    2.5  48.6    4.2   1.4743   4.6 ------	UNKNOWN                       
 37.9321 -71.3071    0.6   0.1 -119.0   2.9805  20.8 ------	UNKNOWN                       
345.3337 -54.2699    2.6  28.1 -153.2   0.6655   4.4 ------	UNKNOWN                       
 61.0827 -22.3999    3.0  50.7  -44.5   3.2968   3.8 ------	UNKNOWN