batgrbproduct analysis for trigger=308041

batgrbproduct Analysis for Trigger=308041

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): Mon Jan 20 03:08:18 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger308041
======================================================================

  Trigger: 00308041      Segment: 000

  BAT Trigger Time: 228541279.552   [s; MET]
      Trigger Stop: 228541280.576   [s; MET]
               UTC: 2008-03-30T03:41:16.872120    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 169.301665972192   Dec: 30.5703275537686  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.58
     Image Trigger?:     NO
     Rate S/N Ratio:     10.9544511501033  [ if not an image trigger ]
     Image S/N Ratio:    7.58

  Flight Position:   [ source = BAT ]
    RA: 169.301665972192   Dec: 30.5703275537686  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 169.270635843616   Dec: 30.6104622445136  [deg; J2000]  
        { 11h 17m 05.0s , +30d 36' 37.7" }
         +/- 1.83809059351469 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.791458960053399 [arcmin] (formal 1-sigma fit error)
    SNR: 12.748273202466
 
  Angular difference between Flight and Ground position is 2.892661 arcmin
 
  Partial Coding Fraction: 0.53125    [ including projection effects ]

  Duration
     T90: 60.363999992609 +/- 36.3982559836483
        Measured from: -0.0799999833106995
                   to: 60.2840000092983     [s; relative to TRIGTIME]
     T50: 31.1000000238419 +/- 25.1133284827267
        Measured from: 1.34000000357628
                   to: 32.4400000274181     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.440000027418137     
                   to: 1.44000002741814     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.547999978065491     
                   to: 62.1200000047684     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.350104   0.224142   0.069993   0.050452
           0.042680   0.043759   0.038567   0.034177 [error]
 Peak      0.054930   0.033829   0.016402   0.009096
           0.007106   0.007336   0.005930   0.005076 [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 1.07e-07 9.86e-08 6.27e-08 6.12e-08 2.94e-07 3.30e-07   erg/cm2
              Error 2.28e-08 2.40e-08 3.31e-08 6.21e-08 7.50e-08 1.12e-07   erg/cm2
Peak flux Power-law 5.31e-01 2.90e-01 9.90e-02 4.40e-02 9.44e-01 9.64e-01   ph/cm2/s
              Error 1.30e-01 6.80e-02 5.04e-02 4.21e-02 1.80e-01 1.87e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.08e-07 9.80e-08 6.12e-08 5.81e-08 2.92e-07 3.25e-07   erg/cm2
              Error 2.26e-08 1.85e-08 3.47e-08 7.14e-08 7.58e-08 1.17e-07   erg/cm2
Peak flux Cutoff-PL 5.42e-01 2.84e-01 9.16e-02 3.80e-02 9.40e-01 9.55e-01   ph/cm2/s
              Error 1.29e-01 6.87e-02 5.10e-02 4.94e-02 1.80e-01 1.89e-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    2.653    0.502    -      -           4.48e-04 1.73e-04   51.470 57
CPL   1.974    0.000       1.4    0.0      1.20e-03 0.00e+00   53.010 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.549    0.521    -      -           4.66e-03 1.79e-03   59.790 57
CPL   3.378    0.280     388.6    0.0      1.84e-03 2.62e-03   57.370 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   62.668   -0.548   62.120
T90    60.364   -0.080   60.284
T50    31.100    1.340   32.440
Peak    1.000    0.440    1.440

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
  169.2706    30.6105   0.0151    27.6815    53.9119         0.5591020     12.748 TRIG_00308041                 
 
Foreground time interval of the image:
 -0.548  11.349 (delta_t =  11.897 [sec])
Background time interval of the image:
-239.552  -0.548 (delta_t = 239.004 [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

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

8 ms binning

From T100_start-3 s to T100_start+3 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

2 ms binning

From T100_start-1 s to T100_start+1 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

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   -0.548 sec. to   62.120 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.65319     ( -0.448208   0.556789 )
Norm@50keV  : 4.48251E-04    ( -0.000171823   0.000173541 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.47 using 59 PHA bins.
# Reduced chi-squared =         0.9030 for     57 degrees of freedom 
# Null hypothesis probability =   6.816745e-01
 
Photon flux (15-150 keV)    in 62.67 sec: 9.70122E-02 ( -0.01717  0.0172101 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.94125e-07 ( -7.15773e-08  7.84935e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.548 sec. to   62.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.97351     (     )
Epeak [keV] : 1.40205      (   )
Norm@50keV  : 1.19525E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.01 using 59 PHA bins.
# Reduced chi-squared =         0.9466 for     56 degrees of freedom 
# Null hypothesis probability =   5.888379e-01
 
Photon flux (15-150 keV)    in 62.67 sec: 9.66439E-02 ( -0.0169425  0.0175881 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.91694e-07 ( -7.06015e-08  8.09508e-08 ) ergs/cm2

Band function

Time interval is from   -0.548 sec. to   62.120 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.78447   ( 1.78445   1.78445 )
beta        : -2.65311    ( 2.65313   0.448506 )
Epeak [keV] : 2.62417      ( -2.6242 9997.37 )
Norm@50keV   : 4.11925E-03    ( -0.0041198   592213 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.47 using 59 PHA bins.
# Reduced chi-squared =         0.9359 for     55 degrees of freedom 
# Null hypothesis probability =   6.101808e-01
 
Photon flux (15-150 keV)    in 62.67 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]    : 5.91092  (-1.27499  1.50145)
R^2/D10^2   : 0.358220  (-0.221308   0.700668)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.84 using 59 PHA bins.
# Reduced chi-squared =          1.050 for     57 degrees of freedom 
# Null hypothesis probability =   3.731275e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.020e-07   4.069e-08
25- 50  9.841e-08   3.724e-08
50-150  8.473e-09   6.212e-09
15-150  2.089e-07   7.511e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 24.3308       (-9.6618      19.2669)
Norm        : 0.924002       (-0.362792     0.753991)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.35 using 59 PHA bins.
# Reduced chi-squared =         0.9535 for     57 degrees of freedom 
# Null hypothesis probability =   5.752062e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.042e-07   2.707e-08
25- 50  1.049e-07   3.552e-08
50-150  4.285e-08   2.832e-08
15-150  2.519e-07   7.859e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.09758        (-4.91055      1.9398)
R1^2/D10^2  : 1.53660        (-0.516859      6.05231)
kT2 [keV]   : 17.6019        (-34.0395      -35.962)
R2^2/D10^2  : 2.26005E-03    (-0.000240828   0.162217)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.54 using 59 PHA bins.
# Reduced chi-squared =         0.9735 for     55 degrees of freedom 
# Null hypothesis probability =   5.304096e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.072e-07   6.342e-08
25- 50  7.823e-08   4.459e-08
50-150  9.046e-08   6.314e-08
15-150  2.759e-07   1.517e-07

Peak spectrum fit

Power-law model

Time interval is from    0.440 sec. to    1.440 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.54875     ( -0.463209   0.578482 )
Norm@50keV  : 4.66039E-03    ( -0.00181148   0.00175934 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.79 using 59 PHA bins.
# Reduced chi-squared =          1.049 for     57 degrees of freedom 
# Null hypothesis probability =   3.745655e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.943553 ( -0.179983  0.180009 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.7237e-08 ( -1.22435e-08  1.31752e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.440 sec. to    1.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 3.37809     ( -0.549409   0.0103011 )
Epeak [keV] : 388.569      (   )
Norm@50keV  : 1.83895E-03    ( -0.00183919   0.00339452 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.37 using 59 PHA bins.
# Reduced chi-squared =          1.025 for     56 degrees of freedom 
# Null hypothesis probability =   4.239764e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.939552 ( -0.177926  0.182248 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.66382e-08 ( -1.16787e-08  1.37974e-08 ) ergs/cm2

Band function

Time interval is from    0.440 sec. to    1.440 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -3.76307   ( 3.76307   3.76307 )
beta        : -2.54890    ( -0.578214   0.463711 )
Epeak [keV] : 36.1129      ( -36.1129 -36.1129 )
Norm@50keV   : 0.633350    ( -0.246203   0.239121 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.79 using 59 PHA bins.
# Reduced chi-squared =          1.087 for     55 degrees of freedom 
# Null hypothesis probability =   3.058539e-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]    : 5.51125  (-1.35663  1.72032)
R^2/D10^2   : 4.64779  (-3.19754   12.4567)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.39 using 59 PHA bins.
# Reduced chi-squared =          1.217 for     57 degrees of freedom 
# Null hypothesis probability =   1.257580e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.643e-08   7.793e-09
25- 50  1.354e-08   7.035e-09
50-150  8.636e-10   6.767e-10
15-150  3.083e-08   1.255e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 26.9539       (-12.7171      31.8213)
Norm        : 8.08785       (-3.51765     8.632)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.78 using 59 PHA bins.
# Reduced chi-squared =          1.119 for     57 degrees of freedom 
# Null hypothesis probability =   2.502311e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.552e-08   4.331e-09
25- 50  1.667e-08   5.731e-09
50-150  7.895e-09   5.553e-09
15-150  4.008e-08   1.312e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.33186        (-1.26264      1.51891)
R1^2/D10^2  : 12.6509        (-9.39867      59.6594)
kT2 [keV]   : 29.9181        (-15.3775      114.661)
R2^2/D10^2  : 4.87932E-03    (-0.00471752   0.0536444)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.88 using 59 PHA bins.
# Reduced chi-squared =          1.052 for     55 degrees of freedom 
# Null hypothesis probability =   3.696050e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.739e-08   9.850e-09
25- 50  1.175e-08   6.248e-09
50-150  2.684e-08   1.738e-08
15-150  5.598e-08   2.845e-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: 2.62581     ( -0.314361   0.360432 )
Norm@50keV  : 1.92018E-03    ( -0.000482245   0.000477811 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.18 using 59 PHA bins.
# Reduced chi-squared =          1.091 for     57 degrees of freedom 
# Null hypothesis probability =   2.969992e-01
 
Photon flux (15-150 keV)    in 11.9 sec: 0.408263 ( -0.0511755  0.0511772 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.37121e-07 ( -3.863e-08  4.06812e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.98709     ( -1.98709   -1.98709 )
Epeak [keV] : 0.747002      ( -0.322459 18.3574 )
Norm@50keV  : 4.74006E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.43 using 59 PHA bins.
# Reduced chi-squared =          1.151 for     56 degrees of freedom 
# Null hypothesis probability =   2.054649e-01
 
Photon flux (15-150 keV)    in 11.9 sec: 0.408076 ( -0.051147  0.051142 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.3605e-07 ( -3.81074e-08  4.04802e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.66386   ( 1.66417   1.66417 )
beta        : -2.62021    ( -0.365013   0.311417 )
Epeak [keV] : 5.21557      ( -4.95634 217.53 )
Norm@50keV   : 1.60071E-02    ( -0.016976   2.3019e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.19 using 59 PHA bins.
# Reduced chi-squared =          1.131 for     55 degrees of freedom 
# Null hypothesis probability =   2.356258e-01
 
Photon flux (15-150 keV)    in 11.9 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)  = 9.86e-08
S(50-100 keV) = 6.27e-08

T90 vs. Hardness ratio plot

T90                                   = 60.363999992609 sec.
Hardness ratio (energy fluence ratio) = 0.635903

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 0.640215
Count Ratio (50-100 keV) / (15-25 keV) = 0.199921

Mask shadow pattern

IMX = 3.090042556740210E-01, IMY = -4.239350379919042E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

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:
-239.552000 -0.548000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
194.0676  44.1595    2.6  44.2   23.9   1.5451   4.4 ------	UNKNOWN                       
166.0728  38.1850    2.1  23.7   37.7   0.9364   5.6 ------	UNKNOWN                       
147.6045  30.2855    2.5  10.5   78.5   0.6561   4.6 ------	UNKNOWN                       
190.2619  56.8312    2.4  41.7    5.3   1.1546   4.7 ------	UNKNOWN                       
134.8017  59.2915    2.4  24.2  -38.5   0.7905   4.9 ------	UNKNOWN

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

Time interval of the image:
-0.548000 11.348600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
169.2706  30.6105    0.9  27.7   53.9   0.5592  12.7 ------	UNKNOWN                       
 94.0795  62.2995    2.1  37.8  -67.0   0.3564   5.5 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
59.548590 962.501400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
161.1037  29.9478    2.8   7.1 -150.8   1.5548   4.1 ------	UNKNOWN                       
166.1185  38.2419    1.2   8.1  -75.7   3.8069   9.3 ------	UNKNOWN                       
199.8875  50.2033    2.8  30.1  -17.2   1.7016   4.1 ------	UNKNOWN                       
217.3439  64.6344    2.7  45.1  -30.9   3.8643   4.2 ------	UNKNOWN                       
134.9291  66.1614    4.2  41.2  -78.0   5.3577   2.8 ------	UNKNOWN

Plot creation:
Sun May 31 07:54:55 EDT 2015