GRB080129: 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 04:59:14 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger301981
======================================================================

  Trigger: 00301981      Segment: 000

  BAT Trigger Time: 223279608   [s; MET]
      Trigger Stop: 223279672   [s; MET]
               UTC: 2008-01-29T06:06:45.464120    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 105.280011758568   Dec: -7.82688688603851  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.51
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.51

  Analysis Position:   [ source = BAT ]
    RA: 105.280011758568   Dec: -7.82688688603851  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 105.287918693116   Dec: -7.84878702628647  [deg; J2000]  
        { 07h 01m 09.1s , -07d 50' 55.6" }
         +/- 2.0979526670691 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.08096063871601 [arcmin] (formal 1-sigma fit error)
    SNR: 10.5538339688152
 
  Angular difference between the analysis and refined position is 1.395530 arcmin
 
  Partial Coding Fraction: 0.46875    [ including projection effects ]

  Duration
     T90: 50.1800000071526 +/- 9.16545032804407
        Measured from: -1.44400000572205
                   to: 48.7360000014305     [s; relative to TRIGTIME]
     T50: 25.8240000009537 +/- 8.11501521505903
        Measured from: 8.5
                   to: 34.3240000009537     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 27.0119999945164     
                   to: 28.0119999945164     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -3.45600000023842     
                   to: 52.4320000112057     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.245843   0.448381   0.393414   0.088385
           0.060115   0.062663   0.054931   0.046762 [error]
 Peak      0.000221   0.031510   0.022339   0.011426
           0.008306   0.008451   0.007610   0.006220 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   55.888   -3.456   52.432
T90    50.180   -1.444   48.736
T50    25.824    8.500   34.324
Peak    1.000   27.012   28.012
 
 
====== 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      -1.268    -0.256      0.266       -           -               -         1.51e-03     -2.22e-04          2.22e-04      52.570   57
CPL     -1.270    -0.252      0.274     9999.360    -9999.360      -9999.360      1.51e-03     -2.21e-04          2.82e-03      52.570   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      -1.023     -0.570     0.687       -           -               -         4.75e-03     -1.79e-03          1.69e-03      58.680   57
CPL     -0.664     -3.555    -1.402      217.110      N/A           N/A         6.86e-03        N/A               N/A         58.620   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   8.66e-08  1.83e-07  3.05e-07  1.15e-06  8.39e-07  1.72e-06   erg/cm2
      90%_error_low -2.43e-08 -3.26e-08 -5.17e-08 -3.83e-07 -1.30e-07 -4.20e-07   erg/cm2
      90%_error_hi   2.64e-08  3.17e-08  5.09e-08  5.03e-07  1.31e-07  5.18e-07   erg/cm2
Peak flux       PL   1.24e-01  1.66e-01  1.63e-01  2.89e-01  5.48e-01  7.42e-01   ph/cm2/s
      90%_error_low -8.04e-02 -8.01e-02 -5.59e-02 -1.64e-01 -2.03e-01 -2.48e-01   ph/cm2/s
      90%_error_hi   1.07e-01  7.76e-02  5.53e-02  2.75e-01  2.08e-01  2.57e-01   ph/cm2/s
 
Fluence        CPL   8.76e-08  1.83e-07  3.03e-07  1.14e-06  8.40e-07  1.73e-06   erg/cm2
      90%_error_low -1.80e-08 -2.48e-08 -5.12e-08    N/A    -1.37e-07 -8.29e-07   erg/cm2
      90%_error_hi   2.72e-08  3.34e-08  5.89e-08    N/A     1.30e-07  2.40e-07   erg/cm2
Peak flux      CPL   1.13e-01  1.70e-01  1.71e-01  2.06e-01  5.42e-01  6.59e-01   ph/cm2/s
      90%_error_low -1.13e-01 -8.39e-02 -6.31e-02 -2.06e-01 -2.03e-01 -3.00e-01   ph/cm2/s
      90%_error_hi   1.16e-01  8.95e-02  7.73e-02  3.39e-01  2.11e-01  3.17e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  105.2879    -7.8488   0.0182    41.5279   176.7982         1.3076689     10.554 TRIG_00301981                 
 
Foreground time interval of the image:
 -3.456  52.432 (delta_t =  55.888 [sec])
Background time interval of the image:
-355.699 -264.950 (delta_t =  90.749 [sec])
-239.000  -3.456 (delta_t = 235.544 [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   -3.456 sec. to   52.432 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.26839     ( -0.256252   0.266422 )
Norm@50keV  : 1.50713E-03    ( -0.000221911   0.000221558 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.57 using 59 PHA bins.
# Reduced chi-squared =         0.9223 for     57 degrees of freedom 
# Null hypothesis probability =   6.418104e-01
 
Photon flux (15-150 keV)    in 55.89 sec: 0.178801 ( -0.028069  0.028226 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.39082e-07 ( -1.30102e-07  1.307e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -3.456 sec. to   52.432 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.27013     ( -0.254438   0.272074 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 1.51276E-03    ( -0.000220558   0.00282278 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.57 using 59 PHA bins.
# Reduced chi-squared =         0.9388 for     56 degrees of freedom 
# Null hypothesis probability =   6.053364e-01
 
Photon flux (15-150 keV)    in 55.89 sec: 0.179055 ( -0.028673  0.028257 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.4034e-07 ( -1.36662e-07  1.29911e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   27.012 sec. to   28.012 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.02299     ( -0.569715   0.687446 )
Norm@50keV  : 4.75369E-03    ( -0.00179388   0.00168954 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.68 using 59 PHA bins.
# Reduced chi-squared =          1.030 for     57 degrees of freedom 
# Null hypothesis probability =   4.135409e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.548014 ( -0.202614  0.208251 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.09965e-08 ( -1.72872e-08  1.73427e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   27.012 sec. to   28.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.1528     ( -2.06669   0.0861122 )
Epeak [keV] : 49.8066      (   )
Norm@50keV  : 1.77806E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.38 using 59 PHA bins.
# Reduced chi-squared =          1.043 for     56 degrees of freedom 
# Null hypothesis probability =   3.878926e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.541971 ( -0.203412  0.211233 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.04232e-08 ( -1.87377e-08  1.77086e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 50.18 sec.
Hardness ratio (energy fluence ratio) = 1.66050411098

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

S(15-50 keV)  = 2.7004501e-07
S(50-150 keV) = 5.690341e-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 = -8.842114871837599E-01, IMY = -4.946245927239137E-02

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:
-355.699400 -264.950000
-239.000000 -3.456000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6300  22.0086    0.3  28.7 -120.5  13.5991  44.6    0.4	Crab                          
125.7051 -10.9129    2.4  45.3  147.5   2.9097   4.9 ------	UNKNOWN                       
187.6852  60.9734    3.5  54.0   19.3   4.7035   3.3 ------	UNKNOWN                       
187.4862  71.6039    2.2  53.9    6.1   4.5239   5.2 ------	UNKNOWN                       
143.5859  64.7696    2.8  36.7    4.9   1.2708   4.2 ------	UNKNOWN                       
100.0023 -22.5409    3.3  57.0  179.3   5.1239   3.5 ------	UNKNOWN                       
102.6388 -12.6533    2.4  46.8  179.1   1.9923   4.8 ------	UNKNOWN                       
106.5517  21.9371    2.0  12.7 -163.9   1.1947   5.7 ------	UNKNOWN                       
 99.8636   6.2452    2.7  29.6 -167.0   0.9927   4.2 ------	UNKNOWN                       
 67.4852  86.5330    2.9  54.8  -19.0   3.0073   4.0 ------	UNKNOWN                       
 11.4319  83.8638    3.1  58.6  -22.9   5.4207   3.7 ------	UNKNOWN                       

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

Time interval of the image:
-3.456000 52.432000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.4771  21.9852    4.9  28.9 -120.4   0.2316   2.3    8.9	Crab                          
180.1025  51.8281    2.5  50.6   31.2   1.6927   4.7 ------	UNKNOWN                       
132.9909  48.4697    2.9  21.2   21.2   0.3004   4.0 ------	UNKNOWN                       
105.2879  -7.8488    1.1  41.5  176.8   1.3074  10.6 ------	UNKNOWN                       
 88.4594  -9.5723    2.4  48.8 -161.9   0.8114   4.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
404.200600 963.120000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
147.4353  33.2376    3.4  37.7   82.8   3.2002   3.4 ------	UNKNOWN                       
290.9053  88.5164    2.4  23.1 -131.7   1.3903   4.8 ------	UNKNOWN                       
268.2673  56.0982    2.5  41.2  -77.6   6.6444   4.7 ------	UNKNOWN