batgrbproduct analysis for trigger=179968

batgrbproduct Analysis for Trigger=179968

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 (local time): Wed Jan 22 18:43:42 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger179968
======================================================================

  Trigger: 00179968      Segment: 000

  BAT Trigger Time: 160562456   [s; MET]
      Trigger Stop: 160562520   [s; MET]
               UTC: 2006-02-02T08:40:55.008460    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 35.8433696212598   Dec: 38.3619559368161  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7

  Flight Position:   [ source = BAT ]
    RA: 35.8433696212598   Dec: 38.3619559368161  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 35.8104023365438   Dec: 38.3745523485316  [deg; J2000]  
        { 02h 23m 14.5s , +38d 22' 28.4" }
         +/- 2.01669092120123 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.981031918932514 [arcmin] (formal 1-sigma fit error)
    SNR: 11.1665578013483
 
  Angular difference between Flight and Ground position is 1.725214 arcmin
 
  Partial Coding Fraction: 0.609375    [ including projection effects ]

  Duration
     T90: 192.876000016928 +/- 22.9389619670661
        Measured from: -16.3240000009537
                   to: 176.552000015974     [s; relative to TRIGTIME]
     T50: 126.880000025034 +/- 13.0830027132744
        Measured from: 4.1879999935627
                   to: 131.068000018597     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -6.44800001382828     
                   to: -5.44800001382828     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -26.4480000138283     
                   to: 190.560000002384     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.342907   1.373116   0.931800   0.266581
           0.080470   0.083342   0.072355   0.061998 [error]
 Peak      0.020556   0.014576   0.019394   0.009853
           0.006215   0.006610   0.005745   0.004808 [error]

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

======================================================================
 
=== 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   Power-law 3.97e-07 6.19e-07 7.26e-07 1.65e-06 2.22e-06 3.39e-06   erg/cm2
              Error 4.27e-08 4.08e-08 7.27e-08 3.48e-07 1.67e-07 4.10e-07   erg/cm2
Peak flux Power-law 1.59e-01 1.73e-01 1.33e-01 1.68e-01 5.28e-01 6.33e-01   ph/cm2/s
              Error 1.34e-01 6.34e-02 5.01e-02 1.54e-01 1.67e-01 1.92e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.98e-07 6.20e-07 7.25e-07 1.62e-06 2.22e-06 3.37e-06   erg/cm2
              Error 4.31e-08 4.04e-08 7.22e-08 5.33e-07 1.26e-07 5.33e-07   erg/cm2
Peak flux Cutoff-PL 1.61e-01 1.74e-01 1.32e-01 1.63e-01 5.29e-01 6.31e-01   ph/cm2/s
              Error 1.00e-01 6.33e-02 5.13e-02 1.93e-01 1.64e-01 2.08e-01   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s

 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.769    0.125    -      -           1.11e-03 8.05e-05   59.750 57
CPL   1.774    0.227    9999.4   -0.0      1.11e-03 5.27e-04   59.760 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.375    0.666    -      -           4.36e-03 1.30e-03   39.070 57
CPL   2.027    0.000      10.6    0.0      1.99e-03 0.00e+00   38.690 56
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^-{Ph_index} (minus sign is not included in the 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 PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedom

 
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
 
T90 in the 50-300 keV band: 202.880000 sec.
T50 in the 50-300 keV band: 120.064000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  217.008  -26.448  190.560
T90   192.876  -16.324  176.552
T50   126.880    4.188  131.068
Peak    1.000   -6.448   -5.448

Click here for the BAT GCN circular template

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   35.8104    38.3746   0.0172    38.1368  -155.9733         1.4640845     11.167 TRIG_00179968                 
 
Foreground time interval of the image:
-26.448  72.501 (delta_t =  98.949 [sec])
Background time interval of the image:
-299.000 -26.448 (delta_t = 272.552 [sec])

Lightcurves

Notes:

1) The mask-weighted light curves are using the flight position.
2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
5) Time of each bin is in the middle of the bin.

1 s binning

From T0-310 s to T0+310 s

From T100_start - 20 s to T100_end + 30 s

Full time interval

64 ms binning

Full time interval

From T100_start to T100_end

From T0-5 sec to T0+5 sec

16 ms binning

From T100_start-5 s to T100_start+5 s

8 ms binning

From T100_start-3 s to T100_start+3 s

2 ms binning

From T100_start-1 s to T100_start+1 s

SN=5 or 10 sec. binning (whichever binning is satisfied first)

SN=5 or 10 sec. binning (T < 200 sec)

Quad-rate summed light curves (from T0-300s to T0+1000s)

Spectral Evolution

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  -26.448 sec. to  190.560 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.76925     ( -0.123938   0.126297 )
Norm@50keV  : 1.11173E-03    ( -8.10068e-05   8.00421e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.75 using 59 PHA bins.
# Reduced chi-squared =          1.048 for     57 degrees of freedom 
# Null hypothesis probability =   3.761992e-01
 
Photon flux (15-150 keV)    in 217 sec: 0.151406 ( -0.0100973  0.010115 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.22379e-06 ( -1.6661e-07  1.68106e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -26.448 sec. to  190.560 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.77397     ( -0.330918   0.123437 )
Epeak [keV] : 9999.36      ( -9999.35 -9999.36 )
Norm@50keV  : 1.10971E-03    ( -0.000530728   0.000522889 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.76 using 59 PHA bins.
# Reduced chi-squared =          1.067 for     56 degrees of freedom 
# Null hypothesis probability =   3.408065e-01
 
Photon flux (15-150 keV)    in 217 sec: 0.151364 ( -0.01009  0.010087 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.22089e-06 ( -8.41873e-08  1.68001e-07 ) ergs/cm2

Band function

Time interval is from  -26.448 sec. to  190.560 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.299993   ( 1.20275   6.12236 )
beta        : -1.80861    ( -0.193934   0.133252 )
Epeak [keV] : 28.5408      ( -28.5252 325.269 )
Norm@50keV   : 1.40749E-02    ( -0.0149632   104.387 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.16 using 59 PHA bins.
# Reduced chi-squared =          1.076 for     55 degrees of freedom 
# Null hypothesis probability =   3.263382e-01
 
Photon flux (15-150 keV)    in 217 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 11.8748  (  )
R^2/D10^2   : 3.60307E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         140.25 using 59 PHA bins.
# Reduced chi-squared =         2.4606 for     57 degrees of freedom 
# Null hypothesis probability =   5.724097e-09
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.330e-07   2.844e-08
25- 50  7.242e-07   5.892e-08
50-150  6.097e-07   9.624e-08
15-150  1.567e-06   1.352e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 123.601       (-33.5203      46.1375)
Norm        : 0.626516       (-0.0520582     0.0704143)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.69 using 59 PHA bins.
# Reduced chi-squared =          1.135 for     57 degrees of freedom 
# Null hypothesis probability =   2.261475e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.537e-07   3.591e-08
25- 50  6.359e-07   5.859e-08
50-150  1.151e-06   3.894e-07
15-150  2.141e-06   4.556e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.18692        (-0.912213      1.01861)
R1^2/D10^2  : 0.310385        (-0.133581      0.263144)
kT2 [keV]   : 26.7717        (-5.09047      8.44447)
R2^2/D10^2  : 1.50389E-03    (-0.000892548   0.00168699)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.28 using 59 PHA bins.
# Reduced chi-squared =          1.041 for     55 degrees of freedom 
# Null hypothesis probability =   3.906822e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.967e-07   8.148e-08
25- 50  6.105e-07   1.058e-07
50-150  1.244e-06   4.061e-07
15-150  2.251e-06   5.219e-07

Peak spectrum fit

Power-law model

Time interval is from   -6.448 sec. to   -5.448 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.37532     ( -0.687551   0.645078 )
Norm@50keV  : 4.36194E-03    ( -0.00130536   0.00129368 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.07 using 59 PHA bins.
# Reduced chi-squared =         0.6855 for     57 degrees of freedom 
# Null hypothesis probability =   9.665416e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.528225 ( -0.167819  0.166772 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.23776e-08 ( -1.41073e-08  1.41455e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -6.448 sec. to   -5.448 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.02668     (     )
Epeak [keV] : 10.5590      (   )
Norm@50keV  : 1.98960E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.69 using 59 PHA bins.
# Reduced chi-squared =         0.6909 for     56 degrees of freedom 
# Null hypothesis probability =   9.623459e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.529499 ( -0.162713  0.165216 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.17391e-08 ( -1.35426e-08  1.37574e-08 ) ergs/cm2

Band function

Time interval is from   -6.448 sec. to   -5.448 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.11691   ( 1.11706   1.11706 )
beta        : -1.37325    ( 1.37396   0.687637 )
Epeak [keV] : 33.8337      ( -33.8785 -33.8785 )
Norm@50keV   : 8.55503E-03    ( -0.00855992   0.141898 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.07 using 59 PHA bins.
# Reduced chi-squared =         0.7104 for     55 degrees of freedom 
# Null hypothesis probability =   9.485465e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 23.7839  (-12.0968  59.431)
R^2/D10^2   : 1.20116E-02  (-0.0113073   0.107559)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.75 using 59 PHA bins.
# Reduced chi-squared =         0.8201 for     57 degrees of freedom 
# Null hypothesis probability =   8.318242e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.211e-09   8.140e-10
25- 50  6.694e-09   4.277e-09
50-150  2.823e-08   1.728e-08
15-150  3.614e-08   2.245e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (-124.007      -199.363)
Norm        : 2.17166       (-0.656545     0.656545)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.34 using 59 PHA bins.
# Reduced chi-squared =         0.7078 for     57 degrees of freedom 
# Null hypothesis probability =   9.535627e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.408e-09   3.296e-09
25- 50  1.040e-08   6.375e-09
50-150  2.281e-08   1.379e-08
15-150  3.862e-08   2.370e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.09823        (-2.09263      2.06086)
R1^2/D10^2  : 2.66150        (-2.45044      30.4212)
kT2 [keV]   : 71.0173        (-48.0514      -72.3767)
R2^2/D10^2  : 6.31336E-04    (-0.000535113   0.00324438)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          35.88 using 59 PHA bins.
# Reduced chi-squared =         0.6524 for     55 degrees of freedom 
# Null hypothesis probability =   9.785889e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.253e-09   4.391e-09
25- 50  6.806e-09   4.041e-09
50-150  3.297e-08   1.906e-08
15-150  4.703e-08   2.487e-08

Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)

Power-law model

 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.46913     ( -0.221964   0.222502 )
Norm@50keV  : 1.06997E-03    ( -0.000129863   0.000129322 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.26 using 59 PHA bins.
# Reduced chi-squared =          1.040 for     57 degrees of freedom 
# Null hypothesis probability =   3.932611e-01
 
Photon flux (15-150 keV)    in 98.95 sec: 0.132497 ( -0.0164937  0.0165737 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.00965e-06 ( -1.33813e-07  1.34834e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.47567     ( -0.232177   0.215516 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 1.06882E-03    ( -0.00107244   0.000728568 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.27 using 59 PHA bins.
# Reduced chi-squared =          1.058 for     56 degrees of freedom 
# Null hypothesis probability =   3.570787e-01
 
Photon flux (15-150 keV)    in 98.95 sec: 0.132875 ( -0.008501  0.016184 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.01048e-06 ( -1.34057e-07  1.30456e-07 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -9.95727   ( 9.95727   9.95727 )
beta        : -1.46912    ( -0.222226   0.222242 )
Epeak [keV] : 49.7460      ( -49.746 -49.746 )
Norm@50keV   : 0.145424    ( -0.017651   0.0175765 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.26 using 59 PHA bins.
# Reduced chi-squared =          1.077 for     55 degrees of freedom 
# Null hypothesis probability =   3.231287e-01
 
Photon flux (15-150 keV)    in 98.95 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

S(25-50 keV) vs. S(50-100 keV) plot

S(25-50 keV)  = 6.19e-07
S(50-100 keV) = 7.26e-07

T90 vs. Hardness ratio plot

T90                                   = 192.876000016928 sec.
Hardness ratio (energy fluence ratio) = 1.17286

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.0225
Count Ratio (50-100 keV) / (15-25 keV) = 0.693868

Mask shadow pattern

IMX = -7.171113790294807E-01, IMY = 3.196790061159926E-01

TIME vs. PHA plot around the trigger time

TIME vs. DetID plot around the trigger time

100 us light curve (15-350 keV)

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:
-299.000000 -26.448000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6312  22.0049    0.8  47.9  139.0  11.3901  13.7    0.6	Crab                          
259.7589  67.5022    3.2  42.8  -34.4   1.1076   3.7 ------	UNKNOWN                       
 19.8806  25.3638    4.2  55.2 -145.1   3.1048   2.8 ------	UNKNOWN                       
274.5955  58.8841    3.8  50.8  -44.4   2.9640   3.1 ------	UNKNOWN

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

Time interval of the image:
-26.448000 72.500610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.5559  21.9800    7.4  47.9  139.0  -0.7593  -1.6    4.8	Crab                          
219.0224  78.9231    2.3  29.8  -19.1   0.5416   4.9 ------	UNKNOWN                       
226.2797  60.7993    2.2  47.7  -13.1   0.9410   5.2 ------	UNKNOWN                       
 35.8103  38.3746    1.0  38.1 -156.0   1.4643  11.2 ------	UNKNOWN                       
246.1223  58.9720    2.2  51.1  -25.6   1.3587   5.2 ------	UNKNOWN                       
 21.6563  29.6088    2.2  50.6 -145.0   1.5768   5.1 ------	UNKNOWN                       
  7.2129  40.1727    2.4  45.9 -124.7   1.9771   4.9 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
131.900600 303.103100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 49.0520  18.9865    2.6  22.5  164.9   0.5775   4.4 ------	UNKNOWN                       
 35.8750  38.3714    0.9   0.0   98.7   1.5166  12.6 ------	UNKNOWN                       
307.5034  60.7744    2.8  56.4  -16.5   2.1114   4.1 ------	UNKNOWN                       
328.1237  41.4220    3.6  50.7  -44.4   2.0411   3.2 ------	UNKNOWN

Plot creation:
Sun May 31 14:22:37 EDT 2015