GRB070923

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 May 27 00:49:36 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger292004
======================================================================

  Trigger: 00292004      Segment: 000

  BAT Trigger Time: 212267725.932   [s; MET]
      Trigger Stop: 212267725.964   [s; MET]
               UTC: 2007-09-23T19:15:23.687760    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 184.626373075231   Dec: -38.2677479658261  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.29
     Image Trigger?:     NO
     Rate S/N Ratio:     45.9673797382448  [ if not an image trigger ]
     Image S/N Ratio:    9.29

  Analysis Position:   [ source = BAT ]
    RA: 184.626373075231   Dec: -38.2677479658261  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 184.641151554106   Dec: -38.2812519038051  [deg; J2000]  
        { 12h 18m 33.9s , -38d 16' 52.5" }
         +/- 1.89578307350786 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.795585009024764 [arcmin] (formal 1-sigma fit error)
    SNR: 12.1976864063386
 
  Angular difference between the analysis and refined position is 1.068202 arcmin
 
  Partial Coding Fraction: 0.765625    [ including projection effects ]

  Duration
     T90: 0.0399999916553497 +/- 0.00894429003608426
        Measured from: -0.00400000810623169
                   to: 0.035999983549118     [s; relative to TRIGTIME]
     T50: 0.0200000107288361 +/- 0.00565686571343518
        Measured from: 0.0039999783039093
                   to: 0.0239999890327454     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.480000019073486     
                   to: 0.519999980926514     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.00400000810623169     
                   to: 0.0399999916553497     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.008743   0.013901   0.022007   0.011381
           0.001865   0.002368   0.002808   0.002375 [error]
 Peak      0.017267   0.015897   0.030256   0.011187
           0.006284   0.006544   0.006151   0.005599 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.044   -0.004    0.040
T90     0.040   -0.004    0.036
T50     0.020    0.004    0.024
Peak    1.000   -0.480    0.520
 
 
====== 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: N/A)
 
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      -0.750    -0.270      0.281       -           -               -         7.34e-02     -1.11e-02          1.10e-02      53.550   57
CPL     -0.676    -0.346      0.836      984.502    -984.502      -984.502      7.96e-02        N/A               N/A         53.720   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      -0.962     -0.541     0.592       -           -               -         4.70e-03     -1.32e-03          1.28e-03      65.750   57
CPL     -0.968     -0.532     0.611     9999.360    -9999.360      -9999.360      4.73e-03     -1.29e-03          1.66e-02      65.760   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   2.05e-09  6.00e-09  1.43e-08  9.32e-08  3.86e-08  1.16e-07   erg/cm2
      90%_error_low -6.16e-10 -1.13e-09 -2.40e-09 -3.23e-08 -6.59e-09 -3.40e-08   erg/cm2
      90%_error_hi   6.81e-10  1.09e-09  2.35e-09  4.32e-08  6.65e-09  4.39e-08   erg/cm2
Peak flux       PL   1.16e-01  1.61e-01  1.65e-01  3.10e-01  5.40e-01  7.51e-01   ph/cm2/s
      90%_error_low -6.38e-02 -6.07e-02 -5.04e-02 -1.72e-01 -1.50e-01 -2.20e-01   ph/cm2/s
      90%_error_hi   8.07e-02  5.67e-02  4.82e-02  2.90e-01  1.51e-01  2.58e-01   ph/cm2/s
 
Fluence        CPL    N/A      N/A      N/A      N/A      N/A      N/A      erg/cm2
      90%_error_low -6.16e-10 -1.13e-09 -2.40e-09 -3.23e-08 -6.59e-09 -3.40e-08   erg/cm2
      90%_error_hi   6.81e-10  1.09e-09  2.35e-09  4.32e-08  6.65e-09  4.39e-08   erg/cm2
Peak flux      CPL   1.16e-01  1.61e-01  1.65e-01  3.07e-01  5.40e-01  7.48e-01   ph/cm2/s
      90%_error_low     N/A       N/A       N/A       N/A   -1.50e-01     N/A     ph/cm2/s
      90%_error_hi      N/A       N/A       N/A       N/A    1.51e-01     N/A     ph/cm2/s
 
======================================================================

Special notes of this burst

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  184.6412   -38.2813   0.0158    20.1521   -92.3035         0.0561092     12.198 TRIG_00292004                 
 
Foreground time interval of the image:
 -0.004   0.040 (delta_t =   0.044 [sec])
Background time interval of the image:
-239.932  -0.004 (delta_t = 239.928 [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

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   -0.004 sec. to    0.040 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.750084     ( -0.26986   0.28065 )
Norm@50keV  : 7.33989E-02    ( -0.0111179   0.0110269 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.55 using 59 PHA bins.
# Reduced chi-squared =         0.9395 for     57 degrees of freedom 
# Null hypothesis probability =   6.052387e-01
 
Photon flux (15-150 keV)    in 0.044 sec: 0.586985 0.397246 0.275941 0.203337 0.161095 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.85587e-08 ( -6.59168e-09  6.64585e-09 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.004 sec. to    0.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.742576     ( -0.346102   0.836057 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 7.39459E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.57 using 59 PHA bins.
# Reduced chi-squared =         0.9565 for     56 degrees of freedom 
# Null hypothesis probability =   5.675645e-01
 
Photon flux (15-150 keV)    in 0.044 sec: 8.48683 ( -1.50605  1.43989 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -0.480 sec. to    0.520 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.961571     ( -0.540749   0.592194 )
Norm@50keV  : 4.69875E-03    ( -0.00132249   0.00128231 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.75 using 59 PHA bins.
# Reduced chi-squared =          1.154 for     57 degrees of freedom 
# Null hypothesis probability =   1.996795e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.540040 ( -0.150381  0.151292 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.15252e-08 ( -1.53759e-08  1.56192e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.480 sec. to    0.520 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.968379     ( -0.532748   0.609977 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 4.73331E-03    ( -0.00128995   0.0165651 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.76 using 59 PHA bins.
# Reduced chi-squared =          1.174 for     56 degrees of freedom 
# Null hypothesis probability =   1.747159e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.539994 ( -0.150491  0.151155 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.13606e-08 ( 0  0 ) 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 = -1.474964381518899E-02, IMY = 3.666820475980682E-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:
-239.932000 -0.004000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5232 -40.5447    1.0  42.6 -156.4   2.2928  11.4    0.6	Vela X-1                      
169.9843 -60.4931    0.0  15.1 -178.0   0.1359   1.1   12.5	Cen X-3                       
186.3947 -62.7432    3.9   8.6  157.0   0.3225   3.0    7.4	GX 301-2                      
244.9706 -15.6419    1.1  54.0   -0.1   4.8682  10.1    0.5	Sco X-1                       
255.9559 -37.7911   11.6  42.1   28.5   0.2586   1.0    3.5	4U 1700-377                   
256.3895 -36.4185   12.3  43.3   27.4  -0.2852  -0.9    2.2	GX 349+2                      
264.5875 -44.3241    9.5  42.4   42.2   0.4246   1.2   10.1	4U 1735-44                    
262.9772 -33.8859    7.5  48.8   30.6   0.9205   1.5    3.1	GX 354-0                      
324.3382 -85.7918    2.5  36.2  113.5   1.2767   4.6 ------	UNKNOWN                       
258.3404 -35.7700    3.4  44.9   28.4   1.0500   3.4 ------	UNKNOWN

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

Time interval of the image:
-0.004000 0.040000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5366 -40.4354    7.8  42.7 -156.2   0.0096   1.5    7.2	Vela X-1                      
170.4052 -60.7639 1013.0  14.9 -179.1   0.0000   0.0    8.9	Cen X-3                       
186.4171 -62.6512   18.5   8.5  157.5  -0.0024  -0.6    9.7	GX 301-2                      
245.0241 -15.6529   13.5  54.0   -0.1   0.0138   0.9    2.7	Sco X-1                       
255.9493 -37.8368    2.9  42.1   28.5   0.0324   4.0    1.8	4U 1700-377                   
256.5099 -36.4057    4.9  43.4   27.5   0.0210   2.3    3.7	GX 349+2                      
264.7434 -44.4847   12.6  42.3   42.5   0.0091   0.9    2.1	4U 1735-44                    
263.0294 -33.8957    4.7  48.9   30.6   0.0364   2.4    4.2	GX 354-0                      
113.2122 -61.3184    2.1  41.0  166.1   0.0360   5.4 ------	UNKNOWN                       
244.0632 -11.8923    2.5  56.8   -3.3   0.1028   4.6 ------	UNKNOWN                       
184.6412 -38.2812    0.9  20.2  -92.3   0.0561  12.2 ------	UNKNOWN                       
214.9528  -5.3493    2.7  52.8  -39.3   0.0855   4.3 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:

Analysis Summary

Notes:

Image

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

Light Curves

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 pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

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

Post-slew 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