batgrbproduct analysis for trigger=280958

batgrbproduct Analysis for Trigger=280958

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 09:17:52 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger280958
======================================================================

  Trigger: 00280958      Segment: 000

  BAT Trigger Time: 202270219.52   [s; MET]
      Trigger Stop: 202270223.616   [s; MET]
               UTC: 2007-05-31T02:10:17.529860    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 6.67853589686105   Dec: 74.3038706234283  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.24
     Image Trigger?:     NO
     Rate S/N Ratio:     14.0712472794703  [ if not an image trigger ]
     Image S/N Ratio:    10.24

  Flight Position:   [ source = BAT ]
    RA: 6.67853589686105   Dec: 74.3038706234283  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 6.70925035211524   Dec: 74.3091694426409  [deg; J2000]  
        { 00h 26m 50.2s , +74d 18' 33.0" }
         +/- 1.69722096771065 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.7001579311515 [arcmin] (formal 1-sigma fit error)
    SNR: 14.2863301482455
 
  Angular difference between Flight and Ground position is 0.591236 arcmin
 
  Partial Coding Fraction: 0.4414062    [ including projection effects ]

  Duration
     T90: 44.6200000047684 +/- 6.05522751926021
        Measured from: -1.04000002145767
                   to: 43.5799999833107     [s; relative to TRIGTIME]
     T50: 21.8920000195503 +/- 6.29776371782261
        Measured from: 2.55199998617172
                   to: 24.444000005722     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.0799999833107     
                   to: 2.0799999833107     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.41200000047684     
                   to: 46.3400000035763     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.302267   0.603663   0.504623   0.204601
           0.055350   0.058720   0.054126   0.052569 [error]
 Peak      0.018697   0.038333   0.049435   0.023505
           0.007876   0.008759   0.008355   0.007787 [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 1.19e-07 2.45e-07 3.92e-07 1.40e-06 1.09e-06 2.16e-06   erg/cm2
              Error 2.48e-08 3.06e-08 5.17e-08 4.14e-07 1.29e-07 4.45e-07   erg/cm2
Peak flux Power-law 1.95e-01 2.85e-01 3.11e-01 6.36e-01 9.87e-01 1.43e+00   ph/cm2/s
              Error 9.44e-02 8.47e-02 6.29e-02 2.91e-01 2.17e-01 3.08e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.13e-07 2.50e-07 4.02e-07 1.00e-06 1.07e-06 1.77e-06   erg/cm2
              Error 2.97e-08 3.45e-08 5.88e-08 7.01e-07 1.37e-07 7.17e-07   erg/cm2
Peak flux Cutoff-PL 1.88e-01 2.86e-01 3.16e-01 5.71e-01 9.82e-01 1.36e+00   ph/cm2/s
              Error 1.11e-01 8.76e-02 7.70e-02 4.79e-01 2.21e-01 4.18e-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    1.320    0.193    -      -           2.27e-03 2.48e-04   56.590 57
CPL   1.075    0.609     205.3    0.0      2.96e-03 3.43e-03   56.240 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.875    0.380    -      -           8.60e-03 1.91e-03   48.680 57
CPL   0.756    0.000     661.8    0.0      9.60e-03 0.00e+00   48.660 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: 45.824000 sec.
T50 in the 50-300 keV band: 25.088000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   48.752   -2.412   46.340
T90    44.620   -1.040   43.580
T50    21.892    2.552   24.444
Peak    1.000    1.080    2.080

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
    6.7093    74.3092   0.0134    44.1503  -175.4577         1.6180363     14.286 TRIG_00280958                 
 
Foreground time interval of the image:
 -2.412  40.581 (delta_t =  42.993 [sec])
Background time interval of the image:
-239.520  -2.412 (delta_t = 237.108 [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   -2.412 sec. to   46.340 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.31968     ( -0.194197   0.192098 )
Norm@50keV  : 2.26932E-03    ( -0.000248355   0.000248345 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.59 using 59 PHA bins.
# Reduced chi-squared =         0.9927 for     57 degrees of freedom 
# Null hypothesis probability =   4.905735e-01
 
Photon flux (15-150 keV)    in 48.75 sec: 0.271742 ( -0.0312004  0.0313099 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.08806e-06 ( -1.29086e-07  1.29872e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -2.412 sec. to   46.340 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.07456     ( -0.804491   0.413792 )
Epeak [keV] : 205.256      ( -205.256 -205.256 )
Norm@50keV  : 2.96148E-03    ( -0.00296148   0.0038992 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.24 using 59 PHA bins.
# Reduced chi-squared =          1.004 for     56 degrees of freedom 
# Null hypothesis probability =   4.659514e-01
 
Photon flux (15-150 keV)    in 48.75 sec: 0.268701 ( -0.032398  0.032427 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.07408e-06 ( -1.37499e-07  1.35662e-07 ) ergs/cm2

Band function

Time interval is from   -2.412 sec. to   46.340 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.07273   ( -0.27194   0.469112 )
beta        : -9.37051    ( 9.37126   19.3713 )
Epeak [keV] : 204.007      ( -93.9819 -204.007 )
Norm@50keV   : 2.96740E-03    ( -0.000685212   0.000682852 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.24 using 59 PHA bins.
# Reduced chi-squared =          1.023 for     55 degrees of freedom 
# Null hypothesis probability =   4.283283e-01
 
Photon flux (15-150 keV)    in 48.75 sec: 0.268741 (    ) 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]    : 18.2087  (-2.54917  3.07621)
R^2/D10^2   : 1.64184E-02  (-0.00674222   0.011064)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          74.20 using 59 PHA bins.
# Reduced chi-squared =          1.302 for     57 degrees of freedom 
# Null hypothesis probability =   6.252384e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.293e-08   1.145e-08
25- 50  2.469e-07   4.224e-08
50-150  5.960e-07   1.213e-07
15-150  8.958e-07   1.463e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 1.13682       (-0.125576     0.125564)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.69 using 59 PHA bins.
# Reduced chi-squared =          1.065 for     57 degrees of freedom 
# Null hypothesis probability =   3.444131e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.380e-07   7.717e-08
25- 50  2.655e-07   7.529e-08
50-150  5.824e-07   2.905e-07
15-150  9.860e-07   5.298e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.58855        (-2.49757      3.25335)
R1^2/D10^2  : 0.192222        (-0.129316      0.389582)
kT2 [keV]   : 30.3403        (-8.04182      22.4757)
R2^2/D10^2  : 2.45354E-03    (-0.00200361   0.00481134)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.49 using 59 PHA bins.
# Reduced chi-squared =          1.009 for     55 degrees of freedom 
# Null hypothesis probability =   4.562055e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.107e-07   5.801e-08
25- 50  2.551e-07   1.134e-07
50-150  7.190e-07   3.827e-07
15-150  1.085e-06   5.194e-07

Peak spectrum fit

Power-law model

Time interval is from    1.080 sec. to    2.080 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.874749     ( -0.40037   0.358749 )
Norm@50keV  : 8.59723E-03    ( -0.00194592   0.00186596 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.68 using 59 PHA bins.
# Reduced chi-squared =         0.8540 for     57 degrees of freedom 
# Null hypothesis probability =   7.755983e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.986666 ( -0.215284  0.217937 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.74446e-08 ( -1.99796e-08  2.00532e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    1.080 sec. to    2.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.755675     (     )
Epeak [keV] : 661.800      (   )
Norm@50keV  : 9.60014E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.66 using 59 PHA bins.
# Reduced chi-squared =         0.8689 for     56 degrees of freedom 
# Null hypothesis probability =   7.462793e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.981691 ( -0.222051  0.220939 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.7256e-08 ( -2.03726e-08  2.0122e-08 ) ergs/cm2

Band function

Time interval is from    1.080 sec. to    2.080 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 5.00000   ( -5   -5 )
beta        : -0.944525    ( -0.42393   0.430342 )
Epeak [keV] : 29.6978      ( -29.6982 44.9107 )
Norm@50keV   : 198.201    ( -39.1236   1.87388e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.20 using 59 PHA bins.
# Reduced chi-squared =         0.8763 for     55 degrees of freedom 
# Null hypothesis probability =   7.301091e-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]    : 27.0608  (-6.45734  10.9758)
R^2/D10^2   : 1.92928E-02  (-0.0121993   0.0259752)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.02 using 59 PHA bins.
# Reduced chi-squared =         0.9127 for     57 degrees of freedom 
# Null hypothesis probability =   6.617673e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.350e-09   1.206e-09
25- 50  1.385e-08   6.400e-09
50-150  7.407e-08   3.049e-08
15-150  9.027e-08   3.441e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 4.18882       (-0.902166     0.901973)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.76 using 59 PHA bins.
# Reduced chi-squared =          1.031 for     57 degrees of freedom 
# Null hypothesis probability =   4.107116e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.044e-08   6.235e-09
25- 50  2.008e-08   1.218e-08
50-150  4.405e-08   2.557e-08
15-150  7.457e-08   4.493e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.70000        (-3.29591      11.3961)
R1^2/D10^2  : 0.801429        (-0.763017      11.2457)
kT2 [keV]   : 35.8177        (-11.4685      -35.7211)
R2^2/D10^2  : 7.69688E-03    (-0.00727258   0.0141046)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.77 using 59 PHA bins.
# Reduced chi-squared =         0.8685 for     55 degrees of freedom 
# Null hypothesis probability =   7.448153e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.887e-09   4.552e-09
25- 50  1.599e-08   8.100e-09
50-150  7.607e-08   4.363e-08
15-150  9.895e-08   5.235e-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: 1.32040     ( -0.195073   0.193035 )
Norm@50keV  : 2.43093E-03    ( -0.000265337   0.000265324 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.55 using 59 PHA bins.
# Reduced chi-squared =          1.010 for     57 degrees of freedom 
# Null hypothesis probability =   4.545996e-01
 
Photon flux (15-150 keV)    in 42.99 sec: 0.291134 ( -0.033356  0.0335142 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.02766e-06 ( -1.21781e-07  1.22505e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.16038     ( -0.797927   0.502203 )
Epeak [keV] : 274.374      ( -286.484 -286.484 )
Norm@50keV  : 2.88891E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.40 using 59 PHA bins.
# Reduced chi-squared =          1.025 for     56 degrees of freedom 
# Null hypothesis probability =   4.228665e-01
 
Photon flux (15-150 keV)    in 42.99 sec: 0.288989 ( -0.034647  0.03464 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.01933e-06 ( -1.29318e-07  1.27586e-07 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.16499   ( 1.01812   1.01812 )
beta        : -2.25824    ( 7.75081   17.566 )
Epeak [keV] : 293.086      ( -175.337 -293.088 )
Norm@50keV   : 2.87686E-03    ( -0.000313836   0.00037589 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.40 using 59 PHA bins.
# Reduced chi-squared =          1.044 for     55 degrees of freedom 
# Null hypothesis probability =   3.861274e-01
 
Photon flux (15-150 keV)    in 42.99 sec: 0.288986 (    ) 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)  = 2.45e-07
S(50-100 keV) = 3.92e-07

T90 vs. Hardness ratio plot

T90                                   = 44.6200000047684 sec.
Hardness ratio (energy fluence ratio) = 1.6

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.99712
Count Ratio (50-100 keV) / (15-25 keV) = 1.66946

Mask shadow pattern

IMX = -9.677236238125366E-01, IMY = 7.687974215051663E-02

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:
-239.520000 -2.412000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.0796  38.4163   14.9  40.3  122.6   0.4302   0.8    7.1	Cyg X-2                       
348.8065  70.5562    2.3  42.7  175.3   1.3574   5.1 ------	UNKNOWN

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

Time interval of the image:
-2.412000 40.580600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.1203  38.3166  366.3  40.3  122.4   0.0072   0.0    2.4	Cyg X-2                       
 13.9694 -24.0290    1.9  54.4    8.1   1.9473   6.1 ------	UNKNOWN                       
  6.7093  74.3092    0.8  44.2 -175.5   1.6181  14.3 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
112.780600 962.558100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.0989  40.9990    3.2  42.4   50.4   4.7274   3.6    2.8	Cyg X-3                       
326.1288  38.3109    6.9  40.6   29.1   1.2617   1.7    2.1	Cyg X-2                       
342.7919  20.4865    2.1  55.2    5.1   9.1988   5.5 ------	UNKNOWN                       
 48.6065  41.5047    3.8  37.9  -77.0   3.5960   3.1 ------	UNKNOWN                       
 32.0787  28.8220    3.5  47.2  -53.2   7.5407   3.3 ------	UNKNOWN

Plot creation:
Sun May 31 10:03:02 EDT 2015