GRB070110: 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 11:59:50 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger255445
======================================================================

  Trigger: 00255445      Segment: 000

  BAT Trigger Time: 190106563.264   [s; MET]
      Trigger Stop: 190106566.336   [s; MET]
               UTC: 2007-01-10T07:22:41.574460    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 0.910178868837273   Dec: -52.9610973406944  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.23
     Image Trigger?:     NO
     Rate S/N Ratio:     9.69535971483266  [ if not an image trigger ]
     Image S/N Ratio:    10.23

  Analysis Position:   [ source = BAT ]
    RA: 0.910178868837273   Dec: -52.9610973406944  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 0.926492269119482   Dec: -52.9715271086932  [deg; J2000]  
        { 00h 03m 42.4s , -52d 58' 17.5" }
         +/- 1.13973172078559 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.332200495828572 [arcmin] (formal 1-sigma fit error)
    SNR: 25.2331667478182
 
  Angular difference between the analysis and refined position is 0.859733 arcmin
 
  Partial Coding Fraction: 0.9765625    [ including projection effects ]

  Duration
     T90: 88.4280000030994 +/- 14.4192933401273
        Measured from: -0.407999992370605
                   to: 88.0200000107288     [s; relative to TRIGTIME]
     T50: 30.472000002861 +/- 5.71885897674762
        Measured from: 9.7039999961853
                   to: 40.1759999990463     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.76800000667572     
                   to: 0.23199999332428     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.74399998784065     
                   to: 108.175999999046     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.825179   0.968236   0.737386   0.183953
           0.050402   0.052127   0.046196   0.041909 [error]
 Peak      0.021711   0.029960   0.020570   0.007762
           0.005126   0.005125   0.004629   0.004145 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  110.920   -2.744  108.176
T90    88.428   -0.408   88.020
T50    30.472    9.704   40.176
Peak    1.000   -0.768    0.232
 
 
====== 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      -1.567    -0.114      0.113       -           -               -         1.56e-03     -9.55e-05          9.49e-05      36.860   57
CPL     -1.569    -0.110      0.127     9999.320    -9999.320      -9999.320      1.56e-03     -7.12e-04          5.58e-04      36.880   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      -1.464     -0.342     0.338       -           -               -         4.96e-03     -1.01e-03          9.96e-04      58.020   57
CPL     -0.986     -0.806     1.901       98.982     -98.982       -98.982      8.95e-03     -4.93e-03          8.51e-02      57.680   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   2.35e-07  4.15e-07  5.61e-07  1.56e-06  1.63e-06  2.77e-06   erg/cm2
      90%_error_low -2.44e-08 -2.54e-08 -4.66e-08 -2.67e-07 -1.09e-07 -3.04e-07   erg/cm2
      90%_error_hi   2.52e-08  2.53e-08  4.65e-08  3.04e-07  1.10e-07  3.35e-07   erg/cm2
Peak flux       PL   1.97e-01  2.03e-01  1.47e-01  1.71e-01  6.13e-01  7.17e-01   ph/cm2/s
      90%_error_low -6.14e-02 -4.17e-02 -3.77e-02 -7.44e-02 -1.20e-01 -1.44e-01   ph/cm2/s
      90%_error_hi   6.62e-02  4.11e-02  3.73e-02  1.04e-01  1.20e-01  1.47e-01   ph/cm2/s
 
Fluence        CPL   2.37e-07  4.12e-07  5.58e-07  1.63e-06  1.65e-06  2.70e-06   erg/cm2
      90%_error_low    N/A       N/A    -4.35e-08 -6.36e-07 -1.31e-07 -5.24e-07   erg/cm2
      90%_error_hi     N/A       N/A     4.96e-08  7.82e-08  8.66e-08  3.91e-07   erg/cm2
Peak flux      CPL   1.85e-01  2.14e-01  1.50e-01  9.31e-02  6.01e-01  6.42e-01   ph/cm2/s
      90%_error_low -7.26e-02 -5.00e-02 -4.10e-02 -9.31e-02 -1.26e-01 -1.58e-01   ph/cm2/s
      90%_error_hi   7.43e-02  5.63e-02  4.17e-02  1.02e-01  1.25e-01  1.77e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
    0.9265   -52.9715   0.0076    20.9015   -11.1292         2.0499812     25.233 TRIG_00255445                 
 
Foreground time interval of the image:
 -2.744  40.637 (delta_t =  43.381 [sec])
Background time interval of the image:
-57.563  -2.744 (delta_t =  54.819 [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   -2.744 sec. to  108.176 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.56663     ( -0.113635   0.11284 )
Norm@50keV  : 1.56081E-03    ( -9.54675e-05   9.49271e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          36.86 using 59 PHA bins.
# Reduced chi-squared =         0.6466 for     57 degrees of freedom 
# Null hypothesis probability =   9.823697e-01
 
Photon flux (15-150 keV)    in 110.9 sec: 0.198560 ( -0.01192  0.011959 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.62597e-06 ( -1.08671e-07  1.09676e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -2.744 sec. to  108.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.56886     ( -0.111253   0.125537 )
Epeak [keV] : 9999.32      ( -9999.36 -9999.36 )
Norm@50keV  : 1.56138E-03    ( -0.000714143   0.000554966 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          36.88 using 59 PHA bins.
# Reduced chi-squared =         0.6585 for     56 degrees of freedom 
# Null hypothesis probability =   9.773370e-01
 
Photon flux (15-150 keV)    in 110.9 sec: 0.200424 ( -0.01382  0.010062 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.6468e-06 ( -1.31209e-07  8.65726e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.768 sec. to    0.232 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.46378     ( -0.34199   0.337905 )
Norm@50keV  : 4.95676E-03    ( -0.00101083   0.000996386 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.02 using 59 PHA bins.
# Reduced chi-squared =          1.018 for     57 degrees of freedom 
# Null hypothesis probability =   4.376484e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.612982 ( -0.119779  0.119914 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.73206e-08 ( -1.0556e-08  1.08214e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.768 sec. to    0.232 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.985967     ( -0.804873   1.90243 )
Epeak [keV] : 98.9824      ( -99.1615 -99.1615 )
Norm@50keV  : 8.94775E-03    ( -0.00491081   0.0851634 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.68 using 59 PHA bins.
# Reduced chi-squared =          1.030 for     56 degrees of freedom 
# Null hypothesis probability =   4.127832e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.601287 ( -0.125883  0.124637 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.50412e-08 ( -1.23907e-08  1.24141e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 88.428 sec.
Hardness ratio (energy fluence ratio) = 1.35042332306

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

S(15-50 keV)  = 6.503921e-07
S(50-150 keV) = 9.755851e-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 = 3.747115588397704E-01, IMY = 7.371383709429975E-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:
-57.563390 -2.744000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.5862 -60.5548    4.5  45.3  172.6   0.3372   2.6    9.0	Cen X-3                       
186.6460 -62.7570    1.0  43.8 -176.3   1.2888  11.4    0.9	GX 301-2                      
 59.3413 -39.1628    2.3  41.1   67.9   1.4723   5.0 ------	UNKNOWN                       
 20.5945 -23.8590    2.0  49.8   17.8   1.1835   5.6 ------	UNKNOWN                       
  0.3709 -29.3229    2.2  44.5   -7.0   0.6108   5.3 ------	UNKNOWN                       
332.7147 -58.7232    2.9  20.8  -59.2   0.2839   3.9 ------	UNKNOWN                       
320.6046 -43.8706    2.6  37.4  -60.1   0.6053   4.4 ------	UNKNOWN                       
227.2316 -48.9431    4.2  55.2 -145.2   1.0934   2.7 ------	UNKNOWN                       

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

Time interval of the image:
-2.744000 40.636630
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.4687 -60.4944    4.2  45.4  172.5  -0.4294  -2.8    8.9	Cen X-3                       
186.7246 -62.8424    2.9  43.7 -176.2   0.5550   4.0    4.7	GX 301-2                      
 13.0809 -54.7567    2.7  18.7    9.8   0.3669   4.3 ------	UNKNOWN                       
  0.9265 -52.9715    0.5  20.9  -11.1   2.0498  25.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
82.836600 675.136600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
154.7604 -70.4778    2.9  55.1  167.6   6.6128   4.0 ------	UNKNOWN                       
 11.1207 -45.7881    2.6   9.7   44.7   1.2444   4.5 ------	UNKNOWN                       
183.8820 -70.1001    2.8  56.9  179.1   7.0378   4.2 ------	UNKNOWN                       
246.8515 -70.8570    3.0  47.7 -158.2   2.5203   3.8 ------	UNKNOWN                       
337.4561 -19.3369    2.7  38.2  -39.5   2.1996   4.2 ------	UNKNOWN                       
250.6617 -58.3629    7.6  55.2 -145.3   3.8976   1.5 ------	UNKNOWN