batgrbproduct analysis for trigger=677495

batgrbproduct Analysis for Trigger=677495

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 Mar 28 15:39:30 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger677495
======================================================================

  Trigger: 00677495      Segment: 000

  BAT Trigger Time: 478695297.984   [s; MET]
      Trigger Stop: 478695298.24   [s; MET]
               UTC: 2016-03-03T10:54:42.058240    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 168.681372288036   Dec: 22.7424795077935  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.2
     Image Trigger?:     NO
     Rate S/N Ratio:     29.4108823397055  [ if not an image trigger ]
     Image S/N Ratio:    8.2

  Flight Position:   [ source = BAT ]
    RA: 168.681372288036   Dec: 22.7424795077935  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 168.714337841967   Dec: 22.708156718444  [deg; J2000]  
        { 11h 14m 51.4s , +22d 42' 29.4" }
         +/- 2.01008996009481 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.05890206865951 [arcmin] (formal 1-sigma fit error)
    SNR: 11.218980366806
 
  Angular difference between Flight and Ground position is 2.751247 arcmin
 
  Partial Coding Fraction: 0.9609375    [ including projection effects ]

  Duration
     T90: 4.97599995136261 +/- 1.00625245213938
        Measured from: -0.0120000243186951
                   to: 4.96399992704391     [s; relative to TRIGTIME]
     T50: 1.57199990749359 +/- 1.49214611727068
        Measured from: 0.171999990940094
                   to: 1.74399989843369     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0879999995231628     
                   to: 0.912000000476837     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0879999995231628     
                   to: 5.31999999284744     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.040896   0.073038   0.058930   0.046892
           0.011604   0.012297   0.010870   0.009448 [error]
 Peak      0.018298   0.042181   0.046754   0.021379
           0.005351   0.005763   0.005391   0.004693 [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 1.17e-08 2.83e-08 5.46e-08 2.59e-07 1.48e-07 3.53e-07   erg/cm2
              Error 4.35e-09 6.05e-09 1.05e-08 1.25e-07 2.72e-08 1.29e-07   erg/cm2
Peak flux Power-law 1.75e-01 2.67e-01 3.06e-01 6.72e-01 9.48e-01 1.42e+00   ph/cm2/s
              Error 5.39e-02 4.98e-02 4.15e-02 2.08e-01 1.30e-01 2.18e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.17e-08 2.80e-08 5.30e-08 2.65e-07 1.48e-07 3.45e-07   erg/cm2
              Error -------- 6.05e-09 1.05e-08 1.63e-07 2.71e-08 1.30e-07   erg/cm2
Peak flux Cutoff-PL 1.60e-01 2.70e-01 3.17e-01 4.98e-01 9.36e-01 1.25e+00   ph/cm2/s
              Error 6.65e-02 5.26e-02 5.22e-02 2.52e-01 1.34e-01 2.78e-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    1.052    0.334    -      -           2.57e-03 4.36e-04   54.490 57
CPL   1.065    0.344    9999.4    0.0      2.59e-03 1.17e-03   54.520 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.803    0.246    -      -           8.25e-03 1.16e-03   43.860 57
CPL   0.506    0.835     299.3    0.0      1.10e-02 0.00e+00   43.580 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: 0.448000 sec.
T50 in the 50-300 keV band: 0.192000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    5.408   -0.088    5.320
T90     4.976   -0.012    4.964
T50     1.572    0.172    1.744
Peak    1.000   -0.088    0.912

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
  168.7143    22.7082   0.0172    22.5514  -171.1635         0.2339239     11.219 TRIG_00677495                 
 
Foreground time interval of the image:
 -0.088   5.320 (delta_t =   5.408 [sec])
Background time interval of the image:
-244.083  -0.088 (delta_t = 243.995 [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 0.256000

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 0.256000

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 0.256000

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   -0.088 sec. to    5.320 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.05160     ( -0.346065   0.32183 )
Norm@50keV  : 2.57135E-03    ( -0.000438346   0.000434243 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.49 using 59 PHA bins.
# Reduced chi-squared =         0.9559 for     57 degrees of freedom 
# Null hypothesis probability =   5.699589e-01
 
Photon flux (15-150 keV)    in 5.408 sec: 0.297016 ( -0.05209  0.05226 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.47729e-07 ( -2.70489e-08  2.72783e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.088 sec. to    5.320 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.06521     ( -0.381496   0.306888 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 2.58949E-03    ( -0.000434014   0.00191444 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.52 using 59 PHA bins.
# Reduced chi-squared =         0.9736 for     56 degrees of freedom 
# Null hypothesis probability =   5.310604e-01
 
Photon flux (15-150 keV)    in 5.408 sec: 0.301659 ( -0.056793  0.04755 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.48111e-07 ( -2.75079e-08  2.67801e-08 ) ergs/cm2

Band function

Time interval is from   -0.088 sec. to    5.320 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.898362   ( 0.898319   0.898319 )
beta        : -1.05163    ( -0.321347   0.346184 )
Epeak [keV] : 38.5504      ( -38.5546 -38.5546 )
Norm@50keV   : 4.22007E-03    ( -0.00207826   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.49 using 59 PHA bins.
# Reduced chi-squared =         0.9907 for     55 degrees of freedom 
# Null hypothesis probability =   4.942053e-01
 
Photon flux (15-150 keV)    in 5.408 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]    : 21.0665  (-5.5066  9.96167)
R^2/D10^2   : 1.13498E-02  (-0.0111742   0.0189269)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.98 using 59 PHA bins.
# Reduced chi-squared =          1.193 for     57 degrees of freedom 
# Null hypothesis probability =   1.514558e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.139e-09   2.059e-09
25- 50  2.647e-08   9.521e-09
50-150  8.758e-08   3.047e-08
15-150  1.192e-07   3.805e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-52.1159      -200)
Norm        : 1.22962       (-0.213331     0.213331)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.19 using 59 PHA bins.
# Reduced chi-squared =          1.091 for     57 degrees of freedom 
# Null hypothesis probability =   2.965486e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.656e-08   9.721e-09
25- 50  3.185e-08   1.837e-08
50-150  6.986e-08   3.986e-08
15-150  1.183e-07   6.738e-08

Double BB

#Fit statistic : Chi-Squared =          51.25 using 59 PHA bins.
# Reduced chi-squared =         0.9445 for     55 degrees of freedom 
# Reduced chi-squared =         0.9440 for     55 degrees of freedom 
# Reduced chi-squared =         0.9353 for     55 degrees of freedom 
# Reduced chi-squared =         0.9332 for     55 degrees of freedom 
# Reduced chi-squared =         0.9326 for     55 degrees of freedom 
# Reduced chi-squared =         0.9319 for     55 degrees of freedom 
# Null hypothesis probability =   5.920434e-01
# Null hypothesis probability =   5.929714e-01
# Null hypothesis probability =   6.114280e-01
# Null hypothesis probability =   6.156888e-01
# Null hypothesis probability =   6.170206e-01
# Null hypothesis probability =   6.185874e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.112e-08   6.452e-09
25- 50  3.118e-08   1.779e-08
50-150  1.139e-07   8.823e-08
15-150  1.562e-07   1.088e-07

Peak spectrum fit

Power-law model

Time interval is from   -0.088 sec. to    0.912 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.803042     ( -0.253919   0.237819 )
Norm@50keV  : 8.25025E-03    ( -0.00116714   0.00114651 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.86 using 59 PHA bins.
# Reduced chi-squared =         0.7695 for     57 degrees of freedom 
# Null hypothesis probability =   8.991643e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.948107 ( -0.129706  0.130353 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.62986e-08 ( -1.34701e-08  1.35539e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.088 sec. to    0.912 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.505937     ( -1.16264   0.507626 )
Epeak [keV] : 299.331      ( -299.168 -299.168 )
Norm@50keV  : 1.10493E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.58 using 59 PHA bins.
# Reduced chi-squared =         0.7782 for     56 degrees of freedom 
# Null hypothesis probability =   8.867404e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.936113 ( -0.13572  0.133227 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.48943e-08 ( -1.46914e-08  1.28092e-08 ) ergs/cm2

Band function

Time interval is from   -0.088 sec. to    0.912 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 5.00000   ( -5   -5 )
beta        : -0.699713    ( -0.240553   0.255961 )
Epeak [keV] : 9989.05      ( -35.3167 -9989.06 )
Norm@50keV   : 7.91060E-08    ( -7.90976e-08   0.00010171 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.74 using 59 PHA bins.
# Reduced chi-squared =         0.7953 for     55 degrees of freedom 
# Null hypothesis probability =   8.625835e-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]    : 24.8842  (-4.40466  6.15512)
R^2/D10^2   : 2.40644E-02  (-0.0115091   0.019705)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.58 using 59 PHA bins.
# Reduced chi-squared =         0.8698 for     57 degrees of freedom 
# Null hypothesis probability =   7.467594e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.595e-09   6.890e-10
25- 50  1.469e-08   3.564e-09
50-150  6.748e-08   1.510e-08
15-150  8.476e-08   2.051e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-27.0493      -200)
Norm        : 3.80177       (-0.543018     0.543018)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.96 using 59 PHA bins.
# Reduced chi-squared =          1.227 for     57 degrees of freedom 
# Null hypothesis probability =   1.162689e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.469e-09   5.480e-09
25- 50  1.822e-08   1.014e-08
50-150  3.995e-08   2.212e-08
15-150  6.763e-08   3.798e-08

Double BB

R1^2/D10^2  : 8.87719E-02        (-0.0585729      0.402748)
kT2 [keV]   : 90.2894        (-74.9366      -81.8595)
R2^2/D10^2  : 6.62801E-04    (-0.000365106   0.0130615)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.57 using 59 PHA bins.
#Fit statistic : Chi-Squared =          42.70 using 59 PHA bins.
#Fit statistic : Chi-Squared =          42.68 using 59 PHA bins.
# Reduced chi-squared =         0.7922 for     55 degrees of freedom 
# Reduced chi-squared =         0.7764 for     55 degrees of freedom 
# Reduced chi-squared =         0.7760 for     55 degrees of freedom 
# Null hypothesis probability =   8.667661e-01
# Null hypothesis probability =   8.866407e-01
# Null hypothesis probability =   8.870317e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.339e-09   2.628e-09
25- 50  1.640e-08   9.280e-09
50-150  6.957e-08   3.961e-08
15-150  9.031e-08   4.796e-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: 1.05160     ( -0.346065   0.32183 )
Norm@50keV  : 2.57135E-03    ( -0.000438346   0.000434243 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.49 using 59 PHA bins.
# Reduced chi-squared =         0.9559 for     57 degrees of freedom 
# Null hypothesis probability =   5.699589e-01
 
Photon flux (15-150 keV)    in 5.408 sec: 0.297014 ( -0.0520868  0.0522588 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.47716e-07 ( -2.70461e-08  2.72857e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.06458     ( -0.381423   0.307443 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 2.58936E-03    ( -0.000433958   0.00191433 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.52 using 59 PHA bins.
# Reduced chi-squared =         0.9736 for     56 degrees of freedom 
# Null hypothesis probability =   5.310822e-01
 
Photon flux (15-150 keV)    in 5.408 sec: 0.298545 ( -0.05398  0.050784 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.48171e-07 ( -2.72682e-08  2.55858e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.898362   ( 0.898319   0.898319 )
beta        : -1.05163    ( -0.321347   0.346184 )
Epeak [keV] : 38.5504      ( -38.5546 -38.5546 )
Norm@50keV   : 4.22007E-03    ( -0.00207828   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.49 using 59 PHA bins.
# Reduced chi-squared =         0.9907 for     55 degrees of freedom 
# Null hypothesis probability =   4.942053e-01
 
Photon flux (15-150 keV)    in 5.408 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)  = 2.83e-08
S(50-100 keV) = 5.46e-08

T90 vs. Hardness ratio plot

T90                                   = 4.97599995136261 sec.
Hardness ratio (energy fluence ratio) = 1.92933

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.78594
Count Ratio (50-100 keV) / (15-25 keV) = 1.44097

Mask shadow pattern

IMX = -4.103354961843101E-01, IMY = 6.379121452094097E-02

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000

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:
-244.083380 -0.088000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
157.6604   9.3596    3.3  18.0  139.8   0.6779   3.4 ------	UNKNOWN                       
197.9386  48.5221    3.6  52.3 -139.4   3.5602   3.2 ------	UNKNOWN

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

Time interval of the image:
-0.088000 5.320000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
168.7143  22.7082    1.0  22.6 -171.2   0.2339  11.2 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
86.316600 962.096000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
124.7451  14.3207    2.9  42.4  162.4   0.8753   4.0 ------	UNKNOWN                       
102.0163  42.6873    4.2  58.0 -156.9   1.8783   2.7 ------	UNKNOWN

Plot creation:
Mon Mar 28 15:51:10 EDT 2016