GRB060115: 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: Wed Jan 22 18:53:53 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger177408
======================================================================

  Trigger: 00177408      Segment: 000

  BAT Trigger Time: 159023281.6   [s; MET]
      Trigger Stop: 159023289.792   [s; MET]
               UTC: 2006-01-15T13:08:00.643040    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 54.0444635355556   Dec: 17.3440437273643  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.48
     Image Trigger?:     NO
     Rate S/N Ratio:     13.856406460551  [ if not an image trigger ]
     Image S/N Ratio:    10.48

  Analysis Position:   [ source = BAT ]
    RA: 54.0444635355556   Dec: 17.3440437273643  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 54.0158303110988   Dec: 17.3351266547733  [deg; J2000]  
        { 03h 36m 03.8s , +17d 20' 06.5" }
         +/- 1.9716186502833 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.01804246683094 [arcmin] (formal 1-sigma fit error)
    SNR: 11.5330130469749
 
  Angular difference between the analysis and refined position is 1.724989 arcmin
 
  Partial Coding Fraction: 0.859375    [ including projection effects ]

  Duration
     T90: 139.092000007629 +/- 15.210022212775
        Measured from: -35.6519999802113
                   to: 103.440000027418     [s; relative to TRIGTIME]
     T50: 92.0320000052452 +/- 2.75519872077308
        Measured from: 3.4040000140667
                   to: 95.4360000193119     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 94.9160000085831     
                   to: 95.9160000085831     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -50.1759999990463     
                   to: 108.844000011683     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.988078   1.293676   0.768126   0.107993
           0.063730   0.066188   0.058043   0.051335 [error]
 Peak      0.028959   0.039118   0.034130   0.014740
           0.004954   0.005353   0.004734   0.004136 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  159.020  -50.176  108.844
T90   139.092  -35.652  103.440
T50    92.032    3.404   95.436
Peak    1.000   94.916   95.916
 
 
====== 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: CPL)
 
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      -1.705    -0.114      0.112       -           -               -         1.24e-03     -8.49e-05          8.42e-05      45.940   57
CPL     -1.009    -0.471      0.530       66.112     -12.165        42.314      2.91e-03     -1.25e-03          2.60e-03      39.260   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      -1.274     -0.245     0.248       -           -               -         7.23e-03     -9.85e-04          9.83e-04      52.510   57
CPL     -1.276     -0.240     0.683     9999.360    -9999.360      -9999.360      7.25e-03     -7.25e-03          7.90e-03      52.520   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   3.05e-07  4.96e-07  6.08e-07  1.47e-06  1.83e-06  2.88e-06   erg/cm2
      90%_error_low -2.99e-08 -3.09e-08 -5.61e-08 -2.64e-07 -1.31e-07 -3.18e-07   erg/cm2
      90%_error_hi   3.07e-08  3.09e-08  5.64e-08  3.01e-07  1.32e-07  3.48e-07   erg/cm2
Peak flux       PL   2.40e-01  2.76e-01  2.28e-01  3.17e-01  8.59e-01  1.06e+00   ph/cm2/s
      90%_error_low -5.87e-02 -4.24e-02 -3.86e-02 -1.01e-01 -1.18e-01 -1.52e-01   ph/cm2/s
      90%_error_hi   6.27e-02  4.15e-02  3.79e-02  1.28e-01  1.18e-01  1.56e-01   ph/cm2/s
 
Fluence        CPL   2.77e-07  5.32e-07  6.14e-07  5.33e-07  1.71e-06  1.96e-06   erg/cm2
      90%_error_low -3.55e-08 -3.95e-08 -6.22e-08 -2.43e-07 -1.48e-07 -2.87e-07   erg/cm2
      90%_error_hi   3.59e-08  4.04e-08  6.19e-08  4.88e-07  1.51e-07  5.02e-07   erg/cm2
Peak flux      CPL   2.42e-01  2.76e-01  2.28e-01  3.16e-01  8.63e-01  1.06e+00   ph/cm2/s
      90%_error_low     N/A       N/A       N/A       N/A       N/A   -2.16e-01   ph/cm2/s
      90%_error_hi      N/A       N/A       N/A       N/A       N/A    1.41e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   54.0158    17.3351   0.0167    20.4848  -130.8717         1.5232498     11.533 TRIG_00177408                 
 
Foreground time interval of the image:
-50.176  52.501 (delta_t = 102.677 [sec])
Background time interval of the image:
-176.699 -50.176 (delta_t = 126.523 [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  -50.176 sec. to  108.844 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.70464     ( -0.113954   0.111943 )
Norm@50keV  : 1.24133E-03    ( -8.4912e-05   8.4195e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.94 using 59 PHA bins.
# Reduced chi-squared =         0.8060 for     57 degrees of freedom 
# Null hypothesis probability =   8.526045e-01
 
Photon flux (15-150 keV)    in 159 sec: 0.165137 ( -0.010358  0.010367 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.82704e-06 ( -1.31032e-07  1.32471e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -50.176 sec. to  108.844 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.00896     ( -0.471319   0.529966 )
Epeak [keV] : 66.1118      ( -12.1652 42.3137 )
Norm@50keV  : 2.90652E-03    ( -0.00125047   0.00259822 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.26 using 59 PHA bins.
# Reduced chi-squared =         0.7012 for     56 degrees of freedom 
# Null hypothesis probability =   9.562720e-01
 
Photon flux (15-150 keV)    in 159 sec: 0.159348 ( -0.011027  0.011028 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.71127e-06 ( -1.48276e-07  1.51363e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   94.916 sec. to   95.916 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.27366     ( -0.245272   0.247734 )
Norm@50keV  : 7.23397E-03    ( -0.000985303   0.000982545 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.51 using 59 PHA bins.
# Reduced chi-squared =         0.9212 for     57 degrees of freedom 
# Null hypothesis probability =   6.440698e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.858992 ( -0.117593  0.117833 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.19631e-08 ( -1.11804e-08  1.1334e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   94.916 sec. to   95.916 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.2762     ( -0.241973   0.681959 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 7.24720E-03    ( -0.00726253   0.00788044 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.52 using 59 PHA bins.
# Reduced chi-squared =         0.9378 for     56 degrees of freedom 
# Null hypothesis probability =   6.074694e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.862597 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.7105e-08 ( -1.20926e-08  1.03043e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 139.092 sec.
Hardness ratio (energy fluence ratio) = 1.15310805275

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

S(15-50 keV)  = 8.090432e-07
S(50-150 keV) = 9.022388e-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 = -2.444601163760651E-01, IMY = 2.824946439181216E-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:
-176.699400 -50.176000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6499  22.0144    0.2  11.8  108.7   5.5183  46.7    0.9	Crab                          
 13.5011  61.1023    3.8  50.6  -44.5   2.2305   3.1 ------	UNKNOWN                       
 24.7941  32.8309    3.6  41.1  -83.6   1.9265   3.2 ------	UNKNOWN                       

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

Time interval of the image:
-50.176000 52.500610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.4931  22.1017    6.0  11.6  108.7   0.2551   1.9    9.4	Crab                          
 76.5100   6.5109    3.1  22.2  158.0   0.4704   3.7 ------	UNKNOWN                       
 54.0158  17.3352    1.0  20.5 -130.9   1.5223  11.5 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
101.300620 302.460700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6277  22.0168    0.4  28.2   90.3   8.2183  31.2    0.3	Crab                          
 61.2968  55.0522    2.4  38.1   21.4   1.1656   4.8 ------	UNKNOWN                       
 73.1591 -13.2586    2.4  36.0  161.8   1.2051   4.8 ------	UNKNOWN                       
 47.4023  47.5616    2.8  30.7    5.9   0.7566   4.2 ------	UNKNOWN                       
 54.8941  -8.5927    2.5  26.0 -167.3   0.7207   4.6 ------	UNKNOWN                       
 48.1169  -2.7800    2.7  21.0 -148.6   0.6786   4.3 ------	UNKNOWN