batgrbproduct analysis for trigger=191157

batgrbproduct Analysis for Trigger=191157

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 18:22:38 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger191157
======================================================================

  Trigger: 00191157      Segment: 000

  BAT Trigger Time: 161926472   [s; MET]
      Trigger Stop: 161926552   [s; MET]
               UTC: 2006-02-18T03:34:30.977720    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 50.4036197387777   Dec: 16.8660799646394  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.84
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.84

  Flight Position:   [ source = BAT ]
    RA: 50.4036197387777   Dec: 16.8660799646394  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 50.3837678142484   Dec: 16.910773911215  [deg; J2000]  
        { 03h 21m 32.1s , +16d 54' 38.8" }
         +/- 2.59439650263142 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.23793325682839 [arcmin] (formal 1-sigma fit error)
    SNR: 7.79180149163257
 
  Angular difference between Flight and Ground position is 2.913794 arcmin
 
  Partial Coding Fraction: 0.8828125    [ including projection effects ]

  Duration
     T90: N/A +/- N/A
        Measured from: N/A
                   to: N/A     [s; relative to TRIGTIME]
     T50: N/A +/- N/A
        Measured from: N/A
                   to: N/A     [s; relative to TRIGTIME]

    WARNING: battblocks failed.  Used TDRSS fore/background intervals

======================================================================
 
=== 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 4.49e-07 5.45e-07 4.80e-07 7.26e-07 1.73e-06 2.20e-06   erg/cm2
              Error 5.57e-08 5.23e-08 8.90e-08 2.61e-07 2.00e-07 3.68e-07   erg/cm2
Peak flux Power-law -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s
 
Fluence   Cutoff-PL 4.33e-07 5.78e-07 4.52e-07 2.68e-07 1.62e-06 1.73e-06   erg/cm2
              Error 6.15e-08 7.11e-08 1.08e-07 4.80e-07 2.42e-07 5.33e-07   erg/cm2
Peak flux Cutoff-PL -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   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    2.184    0.191    -      -           5.12e-04 6.83e-05   66.240 57
CPL   1.654    0.661      25.3   19.2      1.07e-03 1.85e-03   65.010 56
 
 
(1-s peak spectrum is not available)
 
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: 0.320000 sec.
T50 in the 50-300 keV band: 0.192000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100     N/A      N/A     N/A
T90      N/A      N/A     N/A
T50      N/A      N/A     N/A
Peak     N/A      N/A     N/A

Click here for the BAT GCN circular template

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
   50.3838    16.9108   0.0245    24.9852   178.4255         0.7140213      7.792 TRIG_00191157                 
 
Foreground time interval of the image:
  0.000  80.000 (delta_t =  80.000 [sec])
Background time interval of the image:

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 80.000000

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 80.000000

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 80.000000

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  -56.596 sec. to  303.040 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.18401     ( -0.185484   0.197462 )
Norm@50keV  : 5.11912E-04    ( -6.8945e-05   6.76089e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.24 using 59 PHA bins.
# Reduced chi-squared =          1.162 for     57 degrees of freedom 
# Null hypothesis probability =   1.882865e-01
 
Photon flux (15-150 keV)    in 359.6 sec: 8.40427E-02 ( -0.00766424  0.00766441 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.72698e-06 ( -1.97547e-07  2.03127e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -56.596 sec. to  303.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.65352     ( -0.96261   0.358544 )
Epeak [keV] : 25.2979      ( -22.8347 15.4984 )
Norm@50keV  : 1.06934E-03    ( -0.000679131   0.00302387 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.01 using 59 PHA bins.
# Reduced chi-squared =          1.161 for     56 degrees of freedom 
# Null hypothesis probability =   1.915926e-01
 
Photon flux (15-150 keV)    in 359.6 sec: 8.21733E-02 ( -0.008104  0.0081372 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.62262e-06 ( -2.28738e-07  2.54845e-07 ) ergs/cm2

Band function

Time interval is from  -56.596 sec. to  303.040 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.64226   ( 1.64222   1.64222 )
beta        : -2.96660    ( 2.8584   0.805337 )
Epeak [keV] : 25.7243      ( -25.7026 14.6092 )
Norm@50keV   : 1.08321E-03    ( -0.000261652   0.716937 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.92 using 59 PHA bins.
# Reduced chi-squared =          1.180 for     55 degrees of freedom 
# Null hypothesis probability =   1.692892e-01
 
Photon flux (15-150 keV)    in 359.6 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]    : 8.84947  (-0.915281  1.01041)
R^2/D10^2   : 6.07770E-02  (-0.0210321   0.0326518)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          85.00 using 59 PHA bins.
# Reduced chi-squared =          1.491 for     57 degrees of freedom 
# Null hypothesis probability =   9.499392e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.303e-07   5.374e-08
25- 50  6.836e-07   8.523e-08
50-150  2.476e-07   6.937e-08
15-150  1.261e-06   1.471e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 48.0663       (-11.081      16.6653)
Norm        : 0.483162       (-0.074936     0.0967543)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.40 using 59 PHA bins.
# Reduced chi-squared =          1.147 for     57 degrees of freedom 
# Null hypothesis probability =   2.080930e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.208e-07   5.016e-08
25- 50  5.959e-07   6.149e-08
50-150  5.571e-07   1.575e-07
15-150  1.574e-06   2.104e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 3.47850        (-1.17327      1.75211)
R1^2/D10^2  : 1.72201        (-1.41232      5.80429)
kT2 [keV]   : 12.1225        (-2.103      3.96999)
R2^2/D10^2  : 1.45249E-02    (-0.0104757   0.0117996)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.08 using 59 PHA bins.
# Reduced chi-squared =          1.183 for     55 degrees of freedom 
# Null hypothesis probability =   1.659008e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.368e-07   1.930e-07
25- 50  5.827e-07   2.134e-07
50-150  4.606e-07   2.074e-07
15-150  1.480e-06   6.597e-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: 2.30350     ( -0.299747   0.339525 )
Norm@50keV  : 4.81364E-04    ( -0.000121031   0.000120386 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.90 using 59 PHA bins.
# Reduced chi-squared =         0.9807 for     57 degrees of freedom 
# Null hypothesis probability =   5.164728e-01
 
Photon flux (15-150 keV)    in 80 sec: 8.42858E-02 ( -0.0134687  0.0134841 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.68252e-07 ( -7.48583e-08  7.91867e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.361522     ( -3.10811   1.73178 )
Epeak [keV] : 30.4790      ( -11.0494 6.56389 )
Norm@50keV  : 2.50370E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.34 using 59 PHA bins.
# Reduced chi-squared =         0.8811 for     56 degrees of freedom 
# Null hypothesis probability =   7.231970e-01
 
Photon flux (15-150 keV)    in 80 sec: 8.04729E-02 ( -0.0130821  0.0132256 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.06961e-07 ( -5.91632e-08  7.19544e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.361271   ( -2.05061   -0.364041 )
beta        : -9.37167    ( 9.37167   19.3693 )
Epeak [keV] : 30.5949      ( -6.74991 6.3784 )
Norm@50keV   : 2.49188E-02    ( -0.0252284   1.26644 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.34 using 59 PHA bins.
# Reduced chi-squared =         0.8971 for     55 degrees of freedom 
# Null hypothesis probability =   6.897604e-01
 
Photon flux (15-150 keV)    in 80 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.09649e-07 ( 0  0 ) ergs/cm2

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

S(25-50 keV)  = 5.45e-07
S(50-100 keV) = 4.80e-07

T90 vs. Hardness ratio plot

T90                                   = 80 sec.
Hardness ratio (energy fluence ratio) = 0.880734

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.27078
Count Ratio (50-100 keV) / (15-25 keV) = 0.196197

Mask shadow pattern

IMX = -4.658171215831947E-01, IMY = -1.280434502440065E-02

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 80.000000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 80.000000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 80.000000

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:

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

Time interval of the image:
0.000000 80.000000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6470  21.9770    4.2  43.9  130.9   0.8768   2.7    2.4	Crab                          
326.0351  38.4842    6.0  53.2  -33.3  -0.7650  -1.9   11.7	Cyg X-2                       
 63.0813  54.8117    2.4  24.6   72.5   0.5134   4.8 ------	UNKNOWN                       
 50.3837  16.9108    1.5  25.0  178.4   0.7141   7.8 ------	UNKNOWN                       
311.7105  60.8267    2.1  54.4   -3.4   1.4924   5.5 ------	UNKNOWN                       
332.0291  58.3877    2.7  44.7   -8.7   0.5925   4.2 ------	UNKNOWN                       
 51.4677  -1.6407    2.3  42.6 -170.3   0.6322   4.9 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
137.100600 303.040000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6415  22.0206    0.5  31.7   89.8   6.5229  23.4    0.6	Crab                          
 51.3826  64.0440    2.5  47.2   15.1   1.6336   4.6 ------	UNKNOWN                       
 50.4194  16.8297    0.8   0.1  168.6   1.9274  14.3 ------	UNKNOWN                       
 48.5057  10.5720    2.7   6.6 -149.0   0.5423   4.3 ------	UNKNOWN                       
 30.9516  -4.1498    2.6  28.5 -121.3   0.7760   4.4 ------	UNKNOWN                       
  0.6588  27.5529    3.0  46.9  -53.2   2.4632   3.8 ------	UNKNOWN

Plot creation:
Sun May 31 14:10:06 EDT 2015