GRB070406

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 GROUND-DETECTED GRB DATA PROCESSING REPORT                 
    Process Script: hand-made scripts that follow steps in batgrbproduct
                    but without using TDRSS info
    Process Start Time: Tue Sep 30 00:04:36 EDT 2014
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/ground_detect_bursts/scripts
==========================================================================
 
  BAT Trigger Time: 197513440.336
               UTC: 2007-04-06T00:50:38.465   [includes UTCF correction]
       Where From?: Ground analysis (best_duration.txt)
  NOTE: BAT trigger time for ground-detected burst is the T100 start time.
 
  Analysis Position:   [ source = GCN ]
    RA: 198.969   Dec: 16.481  [deg; J2000]
 
  Refined Position:   [ source = BAT pre-slew image ]
    RA: 198.969   Dec: 16.481  [deg; J2000]
        { 13h 15m 52.6s , +16d 28' 51.6" }
        +/- 4.11381286738 [arcmin] (estimated 90% radius based on SNR)
    SNR: 4.03350879953
 
 
  Angular difference between the analysis and refined position is 0.000000 arcmin
 
  Partial Coding Fraction: 9.218750e-01    [ including projection effects ]
 
  Duration (found by FRED-model fit)
     T90: 0.816 +/- N/A
        Measured from: 0.016
                   to: 0.832     [s; relative to TRIGTIME]
     T50: 0.304 +/- N/A
        Measured from: 0.08
                   to: 0.384
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    1.280    0.000    1.280
T90     0.816    0.016    0.832
T50     0.304    0.080    0.384
Peak    1.000   -0.493    0.507
 
 
====== 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      -1.345    -0.697      0.701       -           -               -         2.56e-03     -9.10e-04          8.92e-04      53.190   57
CPL     -1.342     1.342      2.079     9998.640    -9998.640      -9998.640      2.57e-03        N/A               N/A         53.200   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      -1.172     -0.513     0.559       -           -               -         3.54e-03     -9.95e-04          9.94e-04      44.550   57
CPL     -1.177     -0.507     0.573     9999.360    -9999.360      -9999.360      3.55e-03     -9.94e-04          1.01e-03      44.550   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   3.62e-09  7.32e-09  1.15e-08  4.02e-08  3.21e-08  6.26e-08   erg/cm2
      90%_error_low -2.11e-09 -2.89e-09 -5.32e-09 -2.88e-08 -1.25e-08 -3.44e-08   erg/cm2
      90%_error_hi   2.53e-09  2.72e-09  5.12e-09  6.12e-08  1.30e-08  6.18e-08   erg/cm2
Peak flux       PL   1.06e-01  1.30e-01  1.16e-01  1.77e-01  4.13e-01  5.29e-01   ph/cm2/s
      90%_error_low -5.49e-02 -4.57e-02 -3.82e-02 -9.88e-02 -1.20e-01 -1.55e-01   ph/cm2/s
      90%_error_hi   6.52e-02  4.33e-02  3.71e-02  1.66e-01  1.21e-01  1.66e-01   ph/cm2/s
 
Fluence        CPL   3.72e-09  7.20e-09  1.14e-08  4.05e-08  3.23e-08  5.97e-08   erg/cm2
      90%_error_low    N/A    -2.97e-09 -6.67e-09    N/A    -1.38e-08    N/A      erg/cm2
      90%_error_hi     N/A     3.37e-09  2.99e-09    N/A     1.34e-08    N/A      erg/cm2
Peak flux      CPL   1.10e-01  1.30e-01  1.15e-01  1.77e-01  4.15e-01  5.38e-01   ph/cm2/s
      90%_error_low -6.56e-02 -3.53e-02 -3.80e-02 -1.77e-01 -1.23e-01 -5.38e-01   ph/cm2/s
      90%_error_hi   5.04e-02  4.16e-02  4.26e-02  1.63e-01  1.21e-01  1.43e-01   ph/cm2/s
 
======================================================================

Special notes of this burst

Image

15.0-350.0 keV image (Event data)

#RAcent DECcent POSerr Theta  Phi  Peak_Cts  SNR Name
198.969 16.481 0.000 23.571 177.635 0.042 4.034 TRIG_00274153
 
Image time interval: 0.000 to 1.280 [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.

Best duration plot

Full-time range; 1 s binning

Bokeh Plot

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    0.000 sec. to    1.280 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.34469     ( -0.696617   0.700749 )
Norm@50keV  : 2.56213E-03    ( -0.00091033   0.000892062 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.19 using 59 PHA bins.
# Reduced chi-squared =         0.9332 for     57 degrees of freedom 
# Null hypothesis probability =   6.186238e-01
 
Photon flux (15-150 keV)    in 1.28 sec: 0.308332 ( -0.108804  0.109425 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.20723e-08 ( -1.25253e-08  1.29772e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.000 sec. to    1.280 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.21351     ( 1.34168   2.0792 )
Epeak [keV] : 76.6962      ( -9998.86 -9998.86 )
Norm@50keV  : 8.50194E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.15 using 59 PHA bins.
# Reduced chi-squared =         0.9492 for     56 degrees of freedom 
# Null hypothesis probability =   5.832866e-01
 
Photon flux (15-150 keV)    in 1.28 sec: 0.311234 ( -0.119353  0.11406 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.22842e-08 ( -1.37706e-08  1.3412e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -0.493 sec. to    0.507 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.17155     ( -0.51346   0.559402 )
Norm@50keV  : 3.53594E-03    ( -0.000995212   0.000994366 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.55 using 59 PHA bins.
# Reduced chi-squared =         0.7815 for     57 degrees of freedom 
# Null hypothesis probability =   8.849866e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.413463 ( -0.119957  0.120932 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.61726e-08 ( -1.1195e-08  1.1487e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.493 sec. to    0.507 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.17689     ( -0.510294   0.569558 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 3.54754E-03    ( -0.000995034   0.00100422 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.55 using 59 PHA bins.
# Reduced chi-squared =         0.7955 for     56 degrees of freedom 
# Null hypothesis probability =   8.647083e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.414651 ( -0.123477  0.120644 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.63078e-08 ( -1.27421e-08  1.14473e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

S(15-50 keV)  = N/A
S(50-150 keV) = N/A

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 = -0.435917877684, IMY = -0.0180017920811

Spacecraft aspect plot

Bright source in the event data image

Event data image of 15-350 keV band

Time interval of the image:
0.000000 1.280000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
245.0462 -15.5908    5.3  32.7  -19.7   0.0277   2.2    4.9	Sco X-1                       
255.9178 -37.7246    3.7  52.6    1.1   0.0970   3.1    7.9	4U 1700-377                   
256.4063 -36.4386    5.5  52.2   -0.5   0.0602   2.1    1.7	GX 349+2                      
263.0421 -24.8113   13.1  51.9  -16.9  -0.0243  -0.9    4.3	GX 1+4                        
270.3105 -25.0266    4.7  58.2  -19.2  -0.1499  -2.4    3.5	GX 5-1                        
270.3343 -25.7963    5.5  58.4  -18.4  -0.1304  -2.1    3.6	GRS 1758-258                  
263.1184 -33.8101    8.2  55.6   -6.7   0.0606   1.4    6.6	GX 354-0                      
172.8854  12.7254    2.0  44.4  149.9   0.1612   5.8 ------	UNKNOWN                       
230.0597 -39.4565    1.9  41.2   24.3   0.1231   6.1 ------	UNKNOWN                       
223.5013 -29.8788    2.0  30.4   27.7   0.0755   5.7 ------	UNKNOWN                       
198.9384  16.5487    2.5  23.6  177.7   0.0497   4.7 ------	UNKNOWN                       
262.3371   2.5089    2.4  46.7  -52.6   0.2164   4.7 ------	UNKNOWN

Webpage updated on:
Wed Nov 25 16:34:59 EST 2015

Analysis Summary

Notes:

Image

15.0-350.0 keV image (Event data)

Light Curves

Best duration plot

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:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

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

Mask shadow pattern

Spacecraft aspect plot

Bright source in the event data image

Event data image of 15-350 keV band

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