batgrbproduct analysis for trigger=616502

batgrbproduct Analysis for Trigger=616502

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 Nov 19 23:06:53 EST 2014
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger616502
======================================================================

  Trigger: 00616502      Segment: 000

  BAT Trigger Time: 435983824   [s; MET]
      Trigger Stop: 435983888   [s; MET]
               UTC: 2014-10-26T02:36:51.296880    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 44.0804525026473   Dec: 26.9599053858768  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    11

  Flight Position:   [ source = BAT ]
    RA: 44.0804525026473   Dec: 26.9599053858768  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 44.0490065807522   Dec: 26.9251941472626  [deg; J2000]  
        { 02h 56m 11.8s , +26d 55' 30.7" }
         +/- 1.86368916202356 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.733732141123246 [arcmin] (formal 1-sigma fit error)
    SNR: 12.4988642699834
 
  Angular difference between Flight and Ground position is 2.677042 arcmin
 
  Partial Coding Fraction: 0.8828125    [ including projection effects ]

  Duration
     T90: 139.475999951363 +/- 14.8381213498224
        Measured from: 21.7400000095367
                   to: 161.215999960899     [s; relative to TRIGTIME]
     T50: 72.7679999470711 +/- 12.4589060727686
        Measured from: 55.5199999809265
                   to: 128.287999927998     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 65.6399999856949     
                   to: 66.6399999856949     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 13.9559999704361     
                   to: 180.89200001955     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.307293   1.054742   0.391654   0.208802
           0.075008   0.076729   0.065638   0.056640 [error]
 Peak      0.023157   0.007280   0.014637   0.005430
           0.006167   0.006204   0.005165   0.004561 [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 3.77e-07 4.20e-07 3.34e-07 4.40e-07 1.29e-06 1.57e-06   erg/cm2
              Error 4.31e-08 3.68e-08 6.00e-08 1.53e-07 1.32e-07 2.26e-07   erg/cm2
Peak flux Power-law 9.75e-02 1.14e-01 9.68e-02 1.39e-01 3.58e-01 4.47e-01   ph/cm2/s
              Error 9.29e-02 5.72e-02 4.45e-02 1.94e-01 2.48e-01 1.83e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.79e-07 4.20e-07 3.31e-07 4.28e-07 1.29e-06 1.56e-06   erg/cm2
              Error -------- -------- -------- -------- -------- 3.01e-07   erg/cm2
Peak flux Cutoff-PL 9.88e-02 1.15e-01 9.62e-02 1.35e-01 3.59e-01 4.45e-01   ph/cm2/s
              Error 1.00e-01 5.71e-02 4.44e-02 2.10e-01 1.36e-01 3.21e-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    2.331    0.187    -      -           8.07e-04 1.03e-04   62.020 57
CPL   1.989    0.000       1.3   11.5      1.29e-03 2.35e-04   63.310 56
 
The chi2 of BB fit is -------- which shows a significant improvement in the fit over a PL.
Check the BB fit.
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.243    0.955    -      -           3.03e-03 1.11e-03   50.880 57
CPL   2.083    0.000      31.2    0.0      1.17e-03 0.00e+00   50.560 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  166.936   13.956  180.892
T90   139.476   21.740  161.216
T50    72.768   55.520  128.288
Peak    1.000   65.640   66.640

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
   44.0490    26.9252   0.0154    15.7411   128.8679         1.2234431     12.499 TRIG_00616502                 
 
Foreground time interval of the image:
 13.956  73.501 (delta_t =  59.545 [sec])
Background time interval of the image:
-239.000  13.956 (delta_t = 252.956 [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   13.956 sec. to  180.892 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.33101     ( -0.181645   0.192527 )
Norm@50keV  : 8.06691E-04    ( -0.000104014   0.000102215 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.02 using 59 PHA bins.
# Reduced chi-squared =          1.088 for     57 degrees of freedom 
# Null hypothesis probability =   3.018389e-01
 
Photon flux (15-150 keV)    in 166.9 sec: 0.143449 ( -0.0117518  0.0117563 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.29424e-06 ( -1.30576e-07  1.34038e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   13.956 sec. to  180.892 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.98906     ( -1.98906   -1.98906 )
Epeak [keV] : 1.25170      ( -0.492036 22.5139 )
Norm@50keV  : 1.28832E-03    ( -0.000239669   0.000230624 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.31 using 59 PHA bins.
# Reduced chi-squared =          1.131 for     56 degrees of freedom 
# Null hypothesis probability =   2.341743e-01
 
Photon flux (15-150 keV)    in 166.9 sec: 0.143428 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.28989e-06 ( 0  0 ) ergs/cm2

Band function

Time interval is from   13.956 sec. to  180.892 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.56993   ( 1.56473   1.56473 )
beta        : -2.35348    ( 2.3537   0.200785 )
Epeak [keV] : 12.6650      ( -12.8433 72.6542 )
Norm@50keV   : 3.22409E-03    ( -0.00335132   973.49 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.92 using 59 PHA bins.
# Reduced chi-squared =          1.126 for     55 degrees of freedom 
# Null hypothesis probability =   2.428308e-01
 
Photon flux (15-150 keV)    in 166.9 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]    : 7.70293  (-0.759636  0.836201)
R^2/D10^2   : 0.173663  (-0.0598754   0.0934941)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          94.86 using 59 PHA bins.
# Reduced chi-squared =          1.664 for     57 degrees of freedom 
# Null hypothesis probability =   1.219303e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.019e-07   3.922e-08
25- 50  4.943e-07   5.191e-08
50-150  1.144e-07   3.522e-08
15-150  9.106e-07   9.154e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 39.1067       (-8.36566      11.821)
Norm        : 0.921765       (-0.158232     0.201974)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.56 using 59 PHA bins.
# Reduced chi-squared =          1.185 for     57 degrees of freedom 
# Null hypothesis probability =   1.597014e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.506e-07   3.789e-08
25- 50  4.567e-07   4.732e-08
50-150  3.446e-07   9.455e-08
15-150  1.152e-06   1.267e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.45218        (-1.68974      1.36267)
R1^2/D10^2  : 0.605785        (-0.337793      1.9809)
kT2 [keV]   : 22.4003        (-10.4843      39.4207)
R2^2/D10^2  : 1.62931E-03    (-0.00142784   0.00923328)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.91 using 59 PHA bins.
# Reduced chi-squared =          1.198 for     55 degrees of freedom 
# Null hypothesis probability =   1.488353e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.684e-07   8.829e-08
25- 50  4.098e-07   9.747e-08
50-150  5.186e-07   2.903e-07
15-150  1.297e-06   4.157e-07

Peak spectrum fit

Power-law model

Time interval is from   65.640 sec. to   66.640 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.24339     ( -1.08134   0.82823 )
Norm@50keV  : 3.03213E-03    ( -0.00110554   0.00110553 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.88 using 59 PHA bins.
# Reduced chi-squared =         0.8926 for     57 degrees of freedom 
# Null hypothesis probability =   7.026515e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.358152 ( -0.35815  0.138132 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.04126e-08 ( -1.27164e-08  1.30335e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   65.640 sec. to   66.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.08327     (     )
Epeak [keV] : 31.1886      (   )
Norm@50keV  : 1.17071E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.56 using 59 PHA bins.
# Reduced chi-squared =         0.9029 for     56 degrees of freedom 
# Null hypothesis probability =   6.801568e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.358812 ( -0.133678  0.13748 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.96501e-08 ( -6.3734e-09  1.26253e-08 ) ergs/cm2

Band function

Time interval is from   65.640 sec. to   66.640 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.98482   ( -4.98482   -4.98482 )
beta        : -1.31320    ( -1.23817   1.08535 )
Epeak [keV] : 23.9254      ( -23.9254 46.8245 )
Norm@50keV   : 334.623    ( -121.346   2.69606e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.66 using 59 PHA bins.
# Reduced chi-squared =         0.9211 for     55 degrees of freedom 
# Null hypothesis probability =   6.410939e-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]    : 40.1698  (-41.0141  -41.0141)
R^2/D10^2   : 1.94084E-03  (-0.00177263   0.337695)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.85 using 59 PHA bins.
# Reduced chi-squared =         0.9798 for     57 degrees of freedom 
# Null hypothesis probability =   5.182466e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.029e-10   2.792e-10
25- 50  2.751e-09   1.791e-09
50-150  2.644e-08   1.745e-08
15-150  2.959e-08   1.780e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.361       (-199.362      -199.362)
Norm        : 1.47412       (-0.552122     0.553323)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.97 using 59 PHA bins.
# Reduced chi-squared =         0.9118 for     57 degrees of freedom 
# Null hypothesis probability =   6.637255e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.671e-09   2.360e-09
25- 50  7.061e-09   4.510e-09
50-150  1.549e-08   9.945e-09
15-150  2.622e-08   1.682e-08

Double BB

------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.37241        (-2.18688      4.07326)
R1^2/D10^2  : 1.49824        (-1.15185      10.7432)
kT2 [keV]   : 200.000        (      )
R2^2/D10^2  : 9.81885E-05    (-4.54108e-05   0.00021225)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.85 using 59 PHA bins.
#Fit statistic : Chi-Squared =          46.62 using 59 PHA bins.
# Reduced chi-squared =         0.8519 for     55 degrees of freedom 
# Reduced chi-squared =         0.8475 for     55 degrees of freedom 
# Null hypothesis probability =   7.747271e-01
# Null hypothesis probability =   7.822127e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.863e-09   3.088e-09
25- 50  5.253e-09   3.138e-09
50-150  2.594e-08   1.789e-08
15-150  3.606e-08   2.798e-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: 2.02750     ( -0.207454   0.220284 )
Norm@50keV  : 1.16913E-03    ( -0.000170587   0.000166245 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.59 using 59 PHA bins.
# Reduced chi-squared =          1.063 for     57 degrees of freedom 
# Null hypothesis probability =   3.478285e-01
 
Photon flux (15-150 keV)    in 59.54 sec: 0.177623 ( -0.0189851  0.0189848 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.42967e-07 ( -8.56042e-08  8.80132e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.88073     ( -1.11752   0.232204 )
Epeak [keV] : 32.1497      (   )
Norm@50keV  : 1.43257E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.51 using 59 PHA bins.
# Reduced chi-squared =          1.081 for     56 degrees of freedom 
# Null hypothesis probability =   3.163276e-01
 
Photon flux (15-150 keV)    in 59.54 sec: 0.176554 ( -0.01982  0.019735 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.30802e-07 ( -1.13608e-07  9.82827e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.13304   ( 1.09434   1.09434 )
beta        : -2.26464    ( 2.27445   0.409583 )
Epeak [keV] : 32.2200      ( -32.3747 -32.3747 )
Norm@50keV   : 4.47137E-03    ( -0.00523155   377.932 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.54 using 59 PHA bins.
# Reduced chi-squared =          1.083 for     55 degrees of freedom 
# Null hypothesis probability =   3.139543e-01
 
Photon flux (15-150 keV)    in 59.54 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)  = 4.20e-07
S(50-100 keV) = 3.34e-07

T90 vs. Hardness ratio plot

T90                                   = 139.475999951363 sec.
Hardness ratio (energy fluence ratio) = 0.795238

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 0.806814
Count Ratio (50-100 keV) / (15-25 keV) = 0.299592

Mask shadow pattern

IMX = -1.768756455081310E-01, IMY = -2.194556478470043E-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:
-239.000000 13.956000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6244  22.0246    0.3  29.2 -126.5  10.5825  36.5    0.8	Crab                          
 12.7527  21.0362    2.2  39.8   89.3   5.1635   5.2 ------	UNKNOWN                       
 71.2178  65.7906    2.5  52.9  172.2   3.5691   4.6 ------	UNKNOWN                       
 84.7049 -18.8240    2.9  44.8  -59.9   3.8004   4.0 ------	UNKNOWN                       
 86.1607 -15.6261    3.1  43.6  -64.6   3.6974   3.7 ------	UNKNOWN

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

Time interval of the image:
13.956000 73.500590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6603  22.1592   18.0  29.2 -126.7   0.0763   0.6    8.8	Crab                          
 44.0490  26.9252    0.9  15.7  128.9   1.2235  12.5 ------	UNKNOWN                       
 68.5836  60.6922    2.0  47.7  173.0   1.1244   5.6 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
143.500620 209.700600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6558  22.0241    0.6  36.2  -44.8   2.5262  18.2    1.4	Crab                          
 55.6597   8.3687    2.7  21.6   13.6   0.3945   4.2 ------	UNKNOWN                       
 44.0727  26.8854    2.0   0.1   76.4   0.5237   5.7 ------	UNKNOWN                       
 51.4491  22.9167    2.7   7.8  -14.1   0.3738   4.3 ------	UNKNOWN                       
 53.4008  23.3313    3.0   9.1  -22.5   0.3298   3.8 ------	UNKNOWN                       
 69.0913  10.4814    2.4  28.7  -13.6   0.4742   4.9 ------	UNKNOWN                       
356.5166  57.6945    2.8  45.2 -167.6   0.6547   4.0 ------	UNKNOWN                       
 90.7826   4.3440    2.5  49.9  -25.3   0.9168   4.6 ------	UNKNOWN

Plot creation:
Thu May 28 14:06:21 EDT 2015