batgrbproduct analysis for trigger=279898

batgrbproduct Analysis for Trigger=279898

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 09:32:02 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger279898
======================================================================

  Trigger: 00279898      Segment: 000

  BAT Trigger Time: 201375895.232   [s; MET]
      Trigger Stop: 201375899.328   [s; MET]
               UTC: 2007-05-20T17:44:53.264200    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 121.951513642403   Dec: 57.6167755712018  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.32
     Image Trigger?:     NO
     Rate S/N Ratio:     10  [ if not an image trigger ]
     Image S/N Ratio:    7.32

  Flight Position:   [ source = BAT ]
    RA: 121.951513642403   Dec: 57.6167755712018  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 121.884543601363   Dec: 57.6040422374475  [deg; J2000]  
        { 08h 07m 32.3s , +57d 36' 14.6" }
         +/- 2.05374278052933 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.827842339031581 [arcmin] (formal 1-sigma fit error)
    SNR: 10.87987794157
 
  Angular difference between Flight and Ground position is 2.284012 arcmin
 
  Partial Coding Fraction: 0.59375    [ including projection effects ]

  Duration
     T90: 96 +/- 35.7770876399966
        Measured from: -15.2319999933243
                   to: 80.7680000066757     [s; relative to TRIGTIME]
     T50: 48 +/- 16
        Measured from: 0.76800000667572
                   to: 48.7680000066757     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 8.26800000667572     
                   to: 9.26800000667572     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -15.2319999933243     
                   to: 96.7680000066757     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.338528   0.460883   0.520753   0.164677
           0.055549   0.058019   0.051689   0.044368 [error]
 Peak     -0.000480   0.017660   0.012065   0.003589
           0.005980   0.006183   0.005571   0.004629 [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 9.36e-08 2.16e-07 3.95e-07 1.72e-06 1.07e-06 2.42e-06   erg/cm2
              Error 2.20e-08 2.93e-08 5.02e-08 5.26e-07 1.29e-07 5.48e-07   erg/cm2
Peak flux Power-law 5.30e-02 7.77e-02 8.50e-02 1.74e-01 2.69e-01 3.90e-01   ph/cm2/s
              Error 6.23e-02 5.48e-02 4.23e-02 2.50e-01 1.43e-01 2.22e-01   ph/cm2/s
 
Fluence   Cutoff-PL 9.27e-08 2.18e-07 3.91e-07 1.59e-06 1.07e-06 2.29e-06   erg/cm2
              Error 2.19e-08 2.92e-08 5.07e-08 7.14e-07 1.28e-07 7.18e-07   erg/cm2
Peak flux Cutoff-PL 5.05e-02 7.93e-02 8.74e-02 1.25e-01 2.68e-01 3.33e-01   ph/cm2/s
              Error 6.19e-02 6.30e-02 5.05e-02 2.39e-01 1.43e-01 2.29e-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    1.130    0.209    -      -           9.24e-04 1.02e-04   70.650 57
CPL   1.127    0.237    9999.2    0.0      9.29e-04 3.28e-04   70.670 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.871    1.046    -      -           2.34e-03 1.79e-03   39.430 57
CPL   4.361    0.000     291.5    0.0      3.52e-15 0.00e+00   39.300 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: 61.760000 sec.
T50 in the 50-300 keV band: 32.000000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  112.000  -15.232   96.768
T90    96.000  -15.232   80.768
T50    48.000    0.768   48.768
Peak    1.000    8.268    9.268

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
  121.8845    57.6040   0.0177    30.7140  -132.9350         0.9447114     10.880 TRIG_00279898                 
 
Foreground time interval of the image:
-15.232  35.669 (delta_t =  50.901 [sec])
Background time interval of the image:
-239.232 -15.232 (delta_t = 224.000 [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 4.096000

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 4.096000

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 4.096000

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  -15.232 sec. to   96.768 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.12997     ( -0.212101   0.20622 )
Norm@50keV  : 9.24477E-04    ( -0.000102547   0.00010226 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.65 using 59 PHA bins.
# Reduced chi-squared =          1.239 for     57 degrees of freedom 
# Null hypothesis probability =   1.056422e-01
 
Photon flux (15-150 keV)    in 112 sec: 0.107566 ( -0.0124624  0.0125048 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.07242e-06 ( -1.28434e-07  1.29145e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -15.232 sec. to   96.768 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.12696     ( -0.268855   0.205806 )
Epeak [keV] : 9999.21      ( -9999.36 -9999.36 )
Norm@50keV  : 9.29334E-04    ( -0.000101992   0.000553539 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.67 using 59 PHA bins.
# Reduced chi-squared =          1.262 for     56 degrees of freedom 
# Null hypothesis probability =   8.967497e-02
 
Photon flux (15-150 keV)    in 112 sec: 0.107806 ( -0.012708  0.012246 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.06612e-06 ( -1.22723e-07  1.33869e-07 ) ergs/cm2

Band function

Time interval is from  -15.232 sec. to   96.768 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.921880   ( 0.92188   0.92188 )
beta        : -1.12996    ( 1.12996   0.212084 )
Epeak [keV] : 50.2938      ( -50.2937 -50.2937 )
Norm@50keV   : 1.60101E-03    ( -0.000778374   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.65 using 59 PHA bins.
# Reduced chi-squared =          1.285 for     55 degrees of freedom 
# Null hypothesis probability =   7.598435e-02
 
Photon flux (15-150 keV)    in 112 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]    : 21.8765  (-3.35811  4.3484)
R^2/D10^2   : 3.67208E-03  (-0.0015899   0.00262056)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          92.95 using 59 PHA bins.
# Reduced chi-squared =          1.631 for     57 degrees of freedom 
# Null hypothesis probability =   1.854204e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.652e-08   8.674e-09
25- 50  1.925e-07   3.914e-08
50-150  6.881e-07   1.350e-07
15-150  9.171e-07   1.614e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 0.449287       (-0.0508564     0.0508508)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          84.16 using 59 PHA bins.
# Reduced chi-squared =          1.476 for     57 degrees of freedom 
# Null hypothesis probability =   1.116468e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.253e-07   7.022e-08
25- 50  2.411e-07   1.328e-07
50-150  5.288e-07   2.882e-07
15-150  8.952e-07   4.962e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.09708        (-1.99738      4.6553)
R1^2/D10^2  : 0.306875        (-0.270705      2.8391)
kT2 [keV]   : 30.0890        (-6.70325      23.593)
R2^2/D10^2  : 1.24962E-03    (-0.0010111   0.00152599)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.70 using 59 PHA bins.
# Reduced chi-squared =          1.304 for     55 degrees of freedom 
# Null hypothesis probability =   6.462665e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.100e-07   5.636e-08
25- 50  1.840e-07   6.045e-08
50-150  7.834e-07   2.648e-07
15-150  1.077e-06   3.253e-07

Peak spectrum fit

Power-law model

Time interval is from    8.268 sec. to    9.268 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.870843     ( -1.23875   0.852867 )
Norm@50keV  : 2.34332E-03    ( -0.00234332   0.00122923 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.43 using 59 PHA bins.
# Reduced chi-squared =         0.6917 for     57 degrees of freedom 
# Null hypothesis probability =   9.632290e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.268947 ( -0.140627  0.145322 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.66008e-08 ( -1.33082e-08  1.34719e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    8.268 sec. to    9.268 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 4.36056     (     )
Epeak [keV] : 291.471      (   )
Norm@50keV  : 3.51779E-15    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.30 using 59 PHA bins.
# Reduced chi-squared =         0.7017 for     56 degrees of freedom 
# Null hypothesis probability =   9.559061e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.267828 ( -0.139858  0.145941 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.63285e-08 ( -2.63285e-08  1.37184e-08 ) ergs/cm2

Band function

Time interval is from    8.268 sec. to    9.268 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 5.00000   ( -4.97054   -4.97054 )
beta        : -1.25200    ( -3.94212   1.33177 )
Epeak [keV] : 39.2136      ( -39.2165 45.502 )
Norm@50keV   : 13.4360    ( -6.3062   1.03607e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.62 using 59 PHA bins.
# Reduced chi-squared =         0.7021 for     55 degrees of freedom 
# Null hypothesis probability =   9.541095e-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]    : 22.1618  (-11.2655  99.0956)
R^2/D10^2   : 9.64111E-03  (-0.00955801   0.0883138)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.09 using 59 PHA bins.
# Reduced chi-squared =         0.7033 for     57 degrees of freedom 
# Null hypothesis probability =   9.564679e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.734e-10   5.990e-10
25- 50  4.638e-09   3.102e-09
50-150  1.702e-08   1.194e-08
15-150  2.253e-08   1.515e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (-199.363      -199.363)
Norm        : 1.13791       (-0.602745     0.602745)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.14 using 59 PHA bins.
# Reduced chi-squared =         0.7218 for     57 degrees of freedom 
# Null hypothesis probability =   9.436837e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.834e-09   1.958e-09
25- 50  5.451e-09   3.667e-09
50-150  1.195e-08   8.350e-09
15-150  2.024e-08   1.416e-08

Double BB

------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 1.00000E-04        (      )
R1^2/D10^2  : 1.25697E+10        (-1.25706e+10      -1.25706e+10)
kT2 [keV]   : 22.1667        (-11.3023      99.2899)
R2^2/D10^2  : 9.63450E-03    (-0.00953137   0.0883474)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.13 using 59 PHA bins.
#Fit statistic : Chi-Squared =          40.09 using 59 PHA bins.
# Reduced chi-squared =         0.7295 for     55 degrees of freedom 
# Reduced chi-squared =         0.7288 for     55 degrees of freedom 
# Null hypothesis probability =   9.339522e-01
# Null hypothesis probability =   9.345532e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.957e-10   4.316e+04
25- 50  4.620e-09   4.355e+05
50-150  1.536e-08   8.545e+06
15-150  2.088e-08   1.025e+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: 0.861412     ( -0.259125   0.241847 )
Norm@50keV  : 1.27762E-03    ( -0.000180955   0.000176052 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.29 using 59 PHA bins.
# Reduced chi-squared =          1.145 for     57 degrees of freedom 
# Null hypothesis probability =   2.107767e-01
 
Photon flux (15-150 keV)    in 50.9 sec: 0.146642 ( -0.0202169  0.0203672 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.41023e-07 ( -9.7954e-08  9.82217e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.854234     ( -0.742316   0.315099 )
Epeak [keV] : 1.00000E+04      (   )
Norm@50keV  : 1.28613E-03    ( -0.000181477   0.000162225 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.31 using 59 PHA bins.
# Reduced chi-squared =          1.166 for     56 degrees of freedom 
# Null hypothesis probability =   1.848155e-01
 
Photon flux (15-150 keV)    in 50.9 sec: 0.146540 ( -0.020149  0.020087 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.39857e-07 ( -9.63792e-08  9.79112e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -9.99998   ( 9.99998   9.99998 )
beta        : -0.861412    ( -0.241842   0.259127 )
Epeak [keV] : 14.6650      ( -14.665 -14.665 )
Norm@50keV   : 0.173646    ( -0.0245944   0.0239279 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.29 using 59 PHA bins.
# Reduced chi-squared =          1.187 for     55 degrees of freedom 
# Null hypothesis probability =   1.613815e-01
 
Photon flux (15-150 keV)    in 50.9 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)  = 2.16e-07
S(50-100 keV) = 3.95e-07

T90 vs. Hardness ratio plot

T90                                   = 96 sec.
Hardness ratio (energy fluence ratio) = 1.8287

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.36143
Count Ratio (50-100 keV) / (15-25 keV) = 1.53829

Mask shadow pattern

IMX = -4.046736628681478E-01, IMY = 4.349471981261410E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000

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:
-239.232000 -15.232000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
163.8851  23.0641    2.5  54.1  164.9   3.3149   4.7 ------	UNKNOWN                       
185.4765  52.5562    3.1  22.7  143.5   0.5592   3.7 ------	UNKNOWN                       
301.1099  57.9528    2.4  39.0    4.4   1.0452   4.8 ------	UNKNOWN                       
135.0757  57.6315    2.5  27.3 -145.7   0.7291   4.6 ------	UNKNOWN                       
 14.6201  56.6865    2.8  48.3  -49.9   3.3428   4.2 ------	UNKNOWN                       
 19.0011  57.7697    3.5  47.2  -53.1   2.4888   3.3 ------	UNKNOWN

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

Time interval of the image:
-15.232000 35.668600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
151.8699  69.7939    2.2  13.2 -140.8   0.3325   5.1 ------	UNKNOWN                       
121.8845  57.6040    1.1  30.7 -132.9   0.9447  10.9 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
86.868590 489.968590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 75.5849  61.7247    3.1  23.2  -50.0   0.8626   3.8 ------	UNKNOWN

Plot creation:
Sun May 31 10:08:57 EDT 2015