batgrbproduct analysis for trigger=748947

batgrbproduct Analysis for Trigger=748947

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 May  3 17:03:03 EDT 2017
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger748947
======================================================================

  Trigger: 00748947      Segment: 000

  BAT Trigger Time: 514330444.992   [s; MET]
      Trigger Stop: 514330446.016   [s; MET]
               UTC: 2017-04-19T21:33:46.057280    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 60.4979072457145   Dec: -15.1426180694188  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.51
     Image Trigger?:     NO
     Rate S/N Ratio:     15.6204993518133  [ if not an image trigger ]
     Image S/N Ratio:    9.51

  Flight Position:   [ source = BAT ]
    RA: 60.4979072457145   Dec: -15.1426180694188  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 60.4932431992966   Dec: -15.1199588089071  [deg; J2000]  
        { 04h 01m 58.4s , -15d 07' 11.9" }
         +/- 1.36949527471954 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.634765071747146 [arcmin] (formal 1-sigma fit error)
    SNR: 19.4102843214075
 
  Angular difference between Flight and Ground position is 1.386134 arcmin
 
  Partial Coding Fraction: 0.5234375    [ including projection effects ]

  Duration
     T90: 65.8559999465942 +/- 11.260154565347
        Measured from: 1
                   to: 66.8559999465942     [s; relative to TRIGTIME]
     T50: 29.2199999690056 +/- 7.63655344187067
        Measured from: 3.14399999380112
                   to: 32.3639999628067     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.98400002717972     
                   to: 2.98400002717972     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.276000022888184     
                   to: 87.2280000448227     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.664453   1.057691   0.917938   0.129125
           0.069700   0.074353   0.066476   0.062439 [error]
 Peak      0.039192   0.090210   0.114874   0.053908
           0.008685   0.009733   0.009796   0.007631 [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 2.25e-07 4.47e-07 6.91e-07 2.35e-06 1.93e-06 3.70e-06   erg/cm2
              Error 3.07e-08 3.71e-08 6.55e-08 4.83e-07 1.63e-07 5.28e-07   erg/cm2
Peak flux Power-law 4.36e-01 6.64e-01 7.59e-01 1.65e+00 2.35e+00 3.51e+00   ph/cm2/s
              Error 9.99e-02 9.25e-02 7.41e-02 3.63e-01 2.40e-01 3.82e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.99e-07 4.76e-07 7.23e-07 9.56e-07 1.83e-06 2.36e-06   erg/cm2
              Error 3.70e-08 4.57e-08 7.38e-08 7.36e-07 1.81e-07 7.46e-07   erg/cm2
Peak flux Cutoff-PL 4.35e-01 6.65e-01 7.59e-01 1.64e+00 2.35e+00 3.54e+00   ph/cm2/s
              Error -------- -------- -------- -------- -------- 5.65e-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    1.372    0.131    -      -           2.29e-03 1.75e-04   56.330 57
CPL   0.706    0.595      99.3  116.2      4.88e-03 3.62e-03   52.010 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.809    0.178    -      -           2.05e-02 2.13e-03   64.500 57
CPL   0.801    0.374    9997.6    0.0      2.06e-02 8.17e-03   64.510 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: 6.400000 sec.
T50 in the 50-300 keV band: 2.432000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   86.952    0.276   87.228
T90    65.856    1.000   66.856
T50    29.220    3.144   32.364
Peak    1.000    1.984    2.984

Click here for the BAT GCN circular template

Special notes of this burst

Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minute to calcaulte

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   60.4932   -15.1200   0.0099    35.1842   -38.5996         2.5939648     19.410 TRIG_00748947                 
 
Foreground time interval of the image:
  0.276  56.909 (delta_t =  56.633 [sec])
Background time interval of the image:
-239.992   0.276 (delta_t = 240.268 [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    0.276 sec. to   87.228 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.37166     ( -0.130805   0.130307 )
Norm@50keV  : 2.28536E-03    ( -0.000174851   0.000174705 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.33 using 59 PHA bins.
# Reduced chi-squared =         0.9882 for     57 degrees of freedom 
# Null hypothesis probability =   5.001910e-01
 
Photon flux (15-150 keV)    in 86.95 sec: 0.276581 ( -0.021701  0.021739 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.93179e-06 ( -1.62045e-07  1.63242e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.276 sec. to   87.228 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.706223     ( -0.637726   0.552629 )
Epeak [keV] : 99.3333      ( -26.4529 205.875 )
Norm@50keV  : 4.87690E-03    ( -0.0022378   0.00500094 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.01 using 59 PHA bins.
# Reduced chi-squared =         0.9288 for     56 degrees of freedom 
# Null hypothesis probability =   6.264913e-01
 
Photon flux (15-150 keV)    in 86.95 sec: 0.268384 ( -0.022855  0.022802 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.83886e-06 ( -1.80957e-07  1.81316e-07 ) ergs/cm2

Band function

Time interval is from    0.276 sec. to   87.228 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  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]    : 16.2044  (-1.44604  1.63379)
R^2/D10^2   : 2.48974E-02  (-0.00709123   0.00960463)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          74.31 using 59 PHA bins.
# Reduced chi-squared =          1.304 for     57 degrees of freedom 
# Null hypothesis probability =   6.151389e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.172e-07   1.687e-08
25- 50  4.985e-07   5.230e-08
50-150  9.193e-07   1.266e-07
15-150  1.535e-06   1.552e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-29.156      -200)
Norm        : 1.14901       (-0.0875761     0.0875761)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.64 using 59 PHA bins.
# Reduced chi-squared =          1.029 for     57 degrees of freedom 
# Null hypothesis probability =   4.152339e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.488e-07   2.304e-08
25- 50  4.785e-07   6.295e-08
50-150  1.049e-06   3.873e-07
15-150  1.777e-06   4.191e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.27112        (-3.08501      3.72207)
R1^2/D10^2  : 0.137213        (-0.0836287      0.445891)
kT2 [keV]   : 26.3094        (-6.81885      34.1563)
R2^2/D10^2  : 3.57462E-03    (-0.00331359   0.00445953)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.90 using 59 PHA bins.
# Reduced chi-squared =         0.9618 for     55 degrees of freedom 
# Null hypothesis probability =   5.552492e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.875e-07   8.602e-08
25- 50  4.915e-07   1.664e-07
50-150  1.158e-06   5.435e-07
15-150  1.837e-06   7.614e-07

Peak spectrum fit

Power-law model

Time interval is from    1.984 sec. to    2.984 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.808829     ( -0.181911   0.173414 )
Norm@50keV  : 2.04680E-02    ( -0.00214991   0.0021139 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.50 using 59 PHA bins.
# Reduced chi-squared =          1.132 for     57 degrees of freedom 
# Null hypothesis probability =   2.310546e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.35171 ( -0.23927  0.24036 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.38325e-07 ( -2.39718e-08  2.40183e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    1.984 sec. to    2.984 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.800945     ( -0.572752   0.175457 )
Epeak [keV] : 9997.64      ( -9998.23 -9998.23 )
Norm@50keV  : 2.05945E-02    ( -0.00201415   0.0143313 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.51 using 59 PHA bins.
# Reduced chi-squared =          1.152 for     56 degrees of freedom 
# Null hypothesis probability =   2.035585e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.35490 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.3877e-07 ( -2.82953e-08  2.46144e-08 ) ergs/cm2

Band function

Time interval is from    1.984 sec. to    2.984 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  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]    : 26.5767  (-3.77774  4.87957)
R^2/D10^2   : 4.92198E-02  (-0.0192455   0.0291553)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          84.81 using 59 PHA bins.
# Reduced chi-squared =          1.488 for     57 degrees of freedom 
# Null hypothesis probability =   9.854073e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.841e-09   1.140e-09
25- 50  3.415e-08   5.465e-09
50-150  1.769e-07   2.675e-08
15-150  2.169e-07   3.035e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.362       (      )
Norm        : 9.51578       (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         115.14 using 59 PHA bins.
# Reduced chi-squared =         2.0201 for     57 degrees of freedom 
# Null hypothesis probability =   8.209186e-06
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.370e-08   1.301e-08
25- 50  4.558e-08   1.919e-08
50-150  9.997e-08   5.505e-08
15-150  1.692e-07   9.290e-08

Double BB

------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 13.7900        (-3.22174      3.81233)
R1^2/D10^2  : 0.258584        (-0.145455      0.217744)
kT2 [keV]   : 199.621        (-153.789      -199.621)
R2^2/D10^2  : 4.93615E-04    (-0.000124576   0.00822667)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.85 using 59 PHA bins.
#Fit statistic : Chi-Squared =          61.77 using 59 PHA bins.
# Reduced chi-squared =          1.124 for     55 degrees of freedom 
# Reduced chi-squared =          1.123 for     55 degrees of freedom 
# Null hypothesis probability =   2.449575e-01
# Null hypothesis probability =   2.469490e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.138e-08   5.762e-09
25- 50  4.318e-08   2.075e-08
50-150  1.821e-07   1.595e-07
15-150  2.367e-07   1.659e-07

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: 1.32720     ( -0.123425   0.122528 )
Norm@50keV  : 2.99471E-03    ( -0.000220341   0.000220284 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.24 using 59 PHA bins.
# Reduced chi-squared =          1.127 for     57 degrees of freedom 
# Null hypothesis probability =   2.379847e-01
 
Photon flux (15-150 keV)    in 56.63 sec: 0.359129 ( -0.0273014  0.0273522 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.66502e-06 ( -1.33529e-07  1.34231e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.362673     ( -0.670157   0.575135 )
Epeak [keV] : 87.0147      ( -17.2343 53.123 )
Norm@50keV  : 8.93154E-03    ( -0.00420546   0.00974183 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.31 using 59 PHA bins.
# Reduced chi-squared =         0.9878 for     56 degrees of freedom 
# Null hypothesis probability =   5.007759e-01
 
Photon flux (15-150 keV)    in 56.63 sec: 0.344625 ( -0.028765  0.028689 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.5557e-06 ( -1.49968e-07  1.50409e-07 ) ergs/cm2

Band function

 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  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)  = 4.47e-07
S(50-100 keV) = 6.91e-07

T90 vs. Hardness ratio plot

T90                                   = 65.8559999465942 sec.
Hardness ratio (energy fluence ratio) = 1.54586

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.59182
Count Ratio (50-100 keV) / (15-25 keV) = 1.38149

Mask shadow pattern

IMX = 5.509820165708345E-01, IMY = 4.398373453890435E-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:
-239.992000 0.276000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
316.2088 -53.5929    3.0  52.5  161.8   3.4821   3.8 ------	UNKNOWN                       
 89.9250 -12.8635    2.8  51.4   -3.4   1.7095   4.1 ------	UNKNOWN

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

Time interval of the image:
0.276000 56.908590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
333.3822 -74.2691    2.7  39.6  137.2   0.8500   4.3 ------	UNKNOWN                       
 89.4393 -21.0057    1.9  44.9    3.2   0.9032   6.0 ------	UNKNOWN                       
 60.4932 -15.1200    0.6  35.2  -38.6   2.5934  19.4 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
202.508600 302.138000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6028  21.9275    9.8  29.6 -107.0   1.7651   1.2    5.5	Crab                          
172.2524  43.5636    2.2  46.5   47.9  18.0227   5.3 ------	UNKNOWN                       
127.4978  39.4218    3.5  13.6   34.4   2.9610   3.3 ------	UNKNOWN                       
116.2877   0.2826    2.9  29.8  169.5   4.1625   3.9 ------	UNKNOWN                       
104.9274 -10.0883    4.0  41.4 -173.0   4.2258   2.9 ------	UNKNOWN                       
 86.0805 -16.8578    3.3  54.8 -153.7  15.9539   3.5 ------	UNKNOWN                       
 75.0917  24.9717    3.6  36.0  -96.8   6.7542   3.2 ------	UNKNOWN                       
 75.5424   0.5438    2.7  48.0 -129.1  18.1140   4.3 ------	UNKNOWN

Plot creation:
Wed May  3 17:58:46 EDT 2017