GRB100805A: 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: Fri Jan 17 16:50:48 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger430957
======================================================================

  Trigger: 00430957      Segment: 000

  BAT Trigger Time: 302674368.32   [s; MET]
      Trigger Stop: 302674376.512   [s; MET]
               UTC: 2010-08-05T04:12:42.269380    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 299.874325084812   Dec: 52.6145212717446  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.08
     Image Trigger?:     NO
     Rate S/N Ratio:     10.6301458127346  [ if not an image trigger ]
     Image S/N Ratio:    7.08

  Analysis Position:   [ source = BAT ]
    RA: 299.874325084812   Dec: 52.6145212717446  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 299.845296474106   Dec: 52.6178541547715  [deg; J2000]  
        { 19h 59m 22.9s , +52d 37' 04.3" }
         +/- 2.04486243182734 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.926187523535227 [arcmin] (formal 1-sigma fit error)
    SNR: 10.9474388586117
 
  Angular difference between the analysis and refined position is 1.076227 arcmin
 
  Partial Coding Fraction: 0.390625    [ including projection effects ]

  Duration
     T90: 16.7359999418259 +/- 3.0689411549127
        Measured from: -0.223999977111816
                   to: 16.5119999647141     [s; relative to TRIGTIME]
     T50: 8.72799998521805 +/- 1.88498487386326
        Measured from: 2.90799999237061
                   to: 11.6359999775887     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.97200000286102     
                   to: 2.97200000286102     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.35199999809265     
                   to: 17.1079999804497     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.254871   0.311463   0.232973   0.018708
           0.035977   0.036978   0.032781   0.028310 [error]
 Peak      0.019713   0.037462   0.016408   0.013747
           0.008497   0.008827   0.007794   0.006659 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   18.460   -1.352   17.108
T90    16.736   -0.224   16.512
T50     8.728    2.908   11.636
Peak    1.000    1.972    2.972
 
 
====== 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      -1.756    -0.238      0.227       -           -               -         2.98e-03     -4.33e-04          4.24e-04      65.390   57
CPL     -1.172    -0.931      1.075       68.254     -42.225       -68.254      6.00e-03     -6.00e-03          1.52e-02      64.170   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      -1.647     -0.579     0.537       -           -               -         5.38e-03     -1.85e-03          1.78e-03      56.940   57
CPL     -0.632     -1.585     7.456       61.856     -61.856       -61.856      1.90e-02     -1.90e-02          1.64e+02      56.540   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   8.92e-08  1.40e-07  1.66e-07  3.82e-07  5.07e-07  7.78e-07   erg/cm2
      90%_error_low -1.76e-08 -1.83e-08 -3.22e-08 -1.33e-07 -7.52e-08 -1.67e-07   erg/cm2
      90%_error_hi   1.84e-08  1.83e-08  3.22e-08  1.71e-07  7.63e-08  1.97e-07   erg/cm2
Peak flux       PL   2.55e-01  2.35e-01  1.50e-01  1.48e-01  7.02e-01  7.88e-01   ph/cm2/s
      90%_error_low -1.18e-01 -7.65e-02 -6.41e-02 -9.48e-02 -2.22e-01 -2.49e-01   ph/cm2/s
      90%_error_hi   1.34e-01  7.55e-02  6.35e-02  1.59e-01  2.23e-01  2.51e-01   ph/cm2/s
 
Fluence        CPL   8.18e-08  1.50e-07  1.71e-07  1.70e-07  4.87e-07  5.72e-07   erg/cm2
      90%_error_low -2.13e-08 -2.20e-08 -3.50e-08 -1.15e-07 -7.98e-08 -1.44e-07   erg/cm2
      90%_error_hi   2.15e-08  2.38e-08  3.57e-08  2.00e-07  8.18e-08  2.84e-07   erg/cm2
Peak flux      CPL   2.22e-01  2.62e-01  1.56e-01  4.95e-02  6.75e-01  6.89e-01   ph/cm2/s
      90%_error_low -2.22e-01 -9.60e-02     N/A   -4.95e-02 -2.61e-01 -2.75e-01   ph/cm2/s
      90%_error_hi   1.57e-01  1.27e-01     N/A    1.34e-01  2.35e-01  3.24e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  299.8453    52.6179   0.0175    39.1413   157.1786         0.8059237     10.947 TRIG_00430957                 
 
Foreground time interval of the image:
 -1.352  17.108 (delta_t =  18.460 [sec])
Background time interval of the image:
-239.320  -1.352 (delta_t = 237.968 [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   -1.352 sec. to   17.108 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.75566     ( -0.238053   0.227195 )
Norm@50keV  : 2.97551E-03    ( -0.000432597   0.000423918 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.39 using 59 PHA bins.
# Reduced chi-squared =          1.147 for     57 degrees of freedom 
# Null hypothesis probability =   2.083670e-01
 
Photon flux (15-150 keV)    in 18.46 sec: 0.403200 ( -0.053036  0.053108 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.06758e-07 ( -7.5178e-08  7.62861e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -1.352 sec. to   17.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.17183     ( -0.931139   1.07525 )
Epeak [keV] : 68.2536      ( -42.2227 -68.2514 )
Norm@50keV  : 6.00267E-03    ( -0.00600307   0.0151835 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.17 using 59 PHA bins.
# Reduced chi-squared =          1.146 for     56 degrees of freedom 
# Null hypothesis probability =   2.120036e-01
 
Photon flux (15-150 keV)    in 18.46 sec: 0.393397 ( -0.055406  0.055151 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.87071e-07 ( -7.98484e-08  8.18105e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    1.972 sec. to    2.972 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.64664     ( -0.578973   0.536728 )
Norm@50keV  : 5.38221E-03    ( -0.00185399   0.00178454 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.94 using 59 PHA bins.
# Reduced chi-squared =         0.9990 for     57 degrees of freedom 
# Null hypothesis probability =   4.772673e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.702034 ( -0.222478  0.22311 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.00807e-08 ( -1.75727e-08  1.81657e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    1.972 sec. to    2.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.631944     ( -1.58895   7.45233 )
Epeak [keV] : 61.8561      ( -61.7351 -61.7351 )
Norm@50keV  : 1.89769E-02    ( -0.019158   164.33 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.54 using 59 PHA bins.
# Reduced chi-squared =          1.010 for     56 degrees of freedom 
# Null hypothesis probability =   4.545545e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.675480 ( -0.260984  0.234899 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.59071e-08 ( -1.98035e-08  2.0915e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 16.736 sec.
Hardness ratio (energy fluence ratio) = 1.18456764779

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

S(15-50 keV)  = 2.2949186e-07
S(50-150 keV) = 2.772651e-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 = -7.501646146142072E-01, IMY = -3.156705144955707E-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:
-239.320000 -1.352000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5836  35.1243    3.2  47.4  134.6   2.8771   3.6    4.6	Cyg X-1                       
308.1067  40.9422    2.0  38.7  136.5   2.3339   5.8    0.6	Cyg X-3                       
326.1852  38.3466    5.0  27.8  119.7   0.5701   2.3    1.6	Cyg X-2                       
309.9982  39.1626    2.1  38.3  132.9   2.2709   5.6 ------	UNKNOWN                       
 35.8944   4.7886    2.9  51.6   -8.6   1.6163   4.0 ------	UNKNOWN                       
241.7174  75.4717    2.4  51.0 -160.3   2.0232   4.9 ------	UNKNOWN                       
 59.7947  29.7415    4.5  47.0  -53.1   2.2284   2.6 ------	UNKNOWN                       
 72.9681  59.8265    3.2  41.2  -98.1   3.3280   3.6 ------	UNKNOWN                       

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

Time interval of the image:
-1.352000 17.108000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.4336  35.2095    3.9  47.5  134.8  -0.6162  -2.9    7.7	Cyg X-1                       
308.2649  40.8064    9.1  38.6  136.2  -0.1172  -1.3   11.2	Cyg X-3                       
326.0069  38.3022    8.8  28.0  119.8  -0.0780  -1.3    7.8	Cyg X-2                       
299.8453  52.6178    1.0  39.1  157.2   0.8059  10.9 ------	UNKNOWN                       
 44.3607   1.0611    2.6  59.0  -15.2   1.0119   4.3 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
110.380600 918.180620
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5679  35.4634    8.8  36.0 -174.4  -0.6460  -1.3    9.0	Her X-1                       
299.6006  35.2018    0.5  17.4  106.4   9.3784  21.4    0.5	Cyg X-1                       
308.0989  40.9552    0.6  12.9   76.8   7.3066  18.8    0.5	Cyg X-3                       
326.2452  38.1803    9.6  23.3   43.5   0.5354   1.2    9.2	Cyg X-2                       
260.7195  50.7251    3.0  24.1 -153.1   1.6860   3.8 ------	UNKNOWN                       
 27.1016  48.5249    2.2  52.1  -17.3   5.4324   5.2 ------	UNKNOWN                       
 55.8109  72.9186    4.0  47.0  -53.2   7.4189   2.9 ------	UNKNOWN