batgrbproduct analysis for trigger=360068

Analysis for Ground-detected GRB: Trigger=360068

Analysis Summary

Notes:

1) No attempt has been made to eliminate the non-significant decimal places.
2) This is a special analysis for ground-detected GRB. The event data duration is likely to be shorter than the burst duration. In such cases, the burst durations are found using the quad-rate data, and spectral analyses are only available for event data range.
3) Some mask-weighted light curve plots might be missing because the time range is not completely covered by the event data range.

==========================================================================
           BAT GROUND-DETECTED GRB DATA PROCESSING REPORT                 
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 19 14:26:13 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger360068
======================================================================

  Trigger: 00360068      Segment: 000

  BAT Trigger Time: 272071304.224
               UTC: 2009-08-15T23:21:39.223   [includes UTCF correction]
       Where From?: Ground analysis (best_duration.txt)
  NOTE: BAT trigger time for ground-detected burst is the T100 start time.
 
  Analysis Position:   [ source = GCN ]
    RA: 64.473057422274   Dec: -65.9079370199645  [deg; J2000]
 
  Refined Position:   [ source = BAT pre-slew image ]
    RA: 64.4731   Dec: -65.9079  [deg; J2000]
        { 04h 17m 53.5s , -65d -54' -28.4" }
        +/- 2.8644758294 [arcmin] (estimated 90% radius based on SNR)
    SNR: 6.76477782494
 
  Angular difference between the GCN position (ra=64.473057422274, dec=-65.9079370199645 deg) and this refined position is 0.000 arcmin
 
  Partial Coding Fraction: 0.765625    [ including projection effects ]

  Duration
     T90: 0.576000034809113 +/- 0.271529006335861
        Measured from: 0
                   to: 0.576     [s; relative to TRIGTIME]
     T50: 0.255999982357025 +/- 0.181019365655138
        Measured from: 0.192
                   to: 0.448     [s; relative to TRIGTIME]
 
=== 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 2.78e-09 7.53e-09 1.65e-08 9.45e-08 4.44e-08 1.21e-07   erg/cm2
              Error 1.54e-09 2.54e-09 4.34e-09 6.01e-08 1.17e-08 6.15e-08   erg/cm2
Peak flux Power-law 8.00e-02 1.26e-01 1.50e-01 3.46e-01 4.56e-01 7.02e-01   ph/cm2/s
              Error 5.42e-02 5.28e-02 4.17e-02 2.19e-01 1.37e-01 2.24e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.08e-09 7.79e-09 1.82e-08 3.49e-08 4.28e-08 6.31e-08   erg/cm2
              Error 1.90e-09 2.97e-09 5.83e-09 7.83e-08 1.26e-08 7.56e-08   erg/cm2
Peak flux Cutoff-PL 5.03e-02 1.24e-01 1.72e-01 1.47e-01 4.30e-01 4.92e-01   ph/cm2/s
              Error 6.67e-02 6.71e-02 6.20e-02 1.98e-01 1.49e-01 2.56e-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    0.871    0.459    -      -           5.55e-03 1.49e-03   56.900 57
CPL  -0.102    2.453     131.2    0.0      1.40e-02 1.28e-01   56.290 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.752    0.531    -      -           3.96e-03 1.25e-03   51.440 57
CPL  -0.091    3.325     160.5    0.0      8.34e-03 4.25e-01   50.880 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

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    0.704    0.000    0.704
T90     0.576    0.000    0.576
T50     0.256    0.192    0.448
Peak    1.000   -0.148    0.852

Click here for the BAT GCN circular template

Special notes of this burst

Image

15.0-350.0 keV image (Event data)

#RAcent DECcent POSerr Theta  Phi  Peak_Cts  SNR Name
64.473 -65.908 0.000 20.140 126.128 0.066 6.765 TRIG_00360068
 
Foreground time interval of the image: 0.000 to 0.704 [sec]
Background time interval of the image: -59.968 to 0.000 [sec]

Lightcurves

Notes:

1) The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
2) 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 (for the best duration plot, slew times are marked by green arrows).
3) For lightcurves in unit of count rate, time of each bin is in the middle of the bin.

Best duration plot

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) For long bursts, a spectral fit of 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.
4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.

Time averaged spectrum fit using the pre-slew DRM

Power-law model

Time interval is from    0.000 sec. to    0.704 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.871042     ( -0.484856   0.432356 )
Norm@50keV  : 5.55413E-03    ( -0.00151806   0.00147005 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.90 using 59 PHA bins.
# Reduced chi-squared =         0.9982 for     57 degrees of freedom 
# Null hypothesis probability =   4.789418e-01
 
Photon flux (15-150 keV)    in 0.704 sec: 0.637463 ( -0.16878  0.170788 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.43849e-08 ( -1.16654e-08  1.17616e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.000 sec. to    0.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.102350     ( -3.55555   1.34968 )
Epeak [keV] : 131.177      ( -131.171 -131.171 )
Norm@50keV  : 1.40484E-02    ( -0.0140496   0.241909 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.29 using 59 PHA bins.
# Reduced chi-squared =          1.005 for     56 degrees of freedom 
# Null hypothesis probability =   4.639199e-01
 
Photon flux (15-150 keV)    in 0.704 sec: 0.611284 ( -0.181202  0.180347 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.27593e-08 ( -1.26842e-08  1.24433e-08 ) ergs/cm2

Band function

Time interval is from    0.000 sec. to    0.704 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.769362   ( 0.769362   0.769362 )
beta        : -0.871055    ( -0.432135   0.484813 )
Epeak [keV] : 25.1443      ( -25.1443 -25.1443 )
Norm@50keV   : 8.49685E-03    ( -0.00434838   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.90 using 59 PHA bins.
# Reduced chi-squared =          1.034 for     55 degrees of freedom 
# Null hypothesis probability =   4.042993e-01
 
Photon flux (15-150 keV)    in 0.704 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]    : 24.1281  (-6.32347  10.9863)
R^2/D10^2   : 1.80318E-02  (-0.0122266   0.0291969)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.82 using 59 PHA bins.
# Reduced chi-squared =         0.9969 for     57 degrees of freedom 
# Null hypothesis probability =   4.817403e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.308e-09   7.368e-10
25- 50  7.284e-09   3.929e-09
50-150  3.157e-08   1.721e-08
15-150  4.017e-08   2.039e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-71.3928      -200)
Norm        : 2.61353       (-0.710764     0.710764)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.34 using 59 PHA bins.
# Reduced chi-squared =          1.111 for     57 degrees of freedom 
# Null hypothesis probability =   2.626444e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.585e-09   2.846e-09
25- 50  8.820e-09   5.315e-09
50-150  1.934e-08   1.165e-08
15-150  3.275e-08   2.018e-08

Double BB

R1^2/D10^2  : 2.93558E+14        (-2.99896e+14      7.06341e+18)
kT2 [keV]   : 24.6655        (-6.4872      11.5195)
R2^2/D10^2  : 1.67093E-02    (-0.0113838   0.0233415)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.28 using 59 PHA bins.
#Fit statistic : Chi-Squared =          55.26 using 59 PHA bins.
#Fit statistic : Chi-Squared =          55.25 using 59 PHA bins.
# Reduced chi-squared =          1.005 for     55 degrees of freedom 
# Reduced chi-squared =          1.005 for     55 degrees of freedom 
# Reduced chi-squared =          1.004 for     55 degrees of freedom 
# Null hypothesis probability =   4.640795e-01
# Null hypothesis probability =   4.648828e-01
# Null hypothesis probability =   4.653076e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.301e-09   7.772e-10
25- 50  7.051e-09   4.144e-09
50-150  3.186e-08   1.657e-08
15-150  4.022e-08   2.387e-08

Peak spectrum fit

Power-law model

Time interval is from   -0.148 sec. to    0.852 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.751514     ( -0.572986   0.489665 )
Norm@50keV  : 3.96075E-03    ( -0.00128996   0.00121924 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.44 using 59 PHA bins.
# Reduced chi-squared =         0.9025 for     57 degrees of freedom 
# Null hypothesis probability =   6.827511e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.456235 ( -0.13567  0.138445 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.72548e-08 ( -1.34611e-08  1.3541e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.148 sec. to    0.852 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -9.09537E-02     ( -6.41184   0.23893 )
Epeak [keV] : 160.465      ( -129.038 -129.038 )
Norm@50keV  : 8.33648E-03    ( -0.0121261   0.838802 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.88 using 59 PHA bins.
# Reduced chi-squared =         0.9085 for     56 degrees of freedom 
# Null hypothesis probability =   6.686286e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.429923 ( -0.148387  0.149462 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.53869e-08 ( -1.48791e-08  1.43676e-08 ) ergs/cm2

Band function

Time interval is from   -0.148 sec. to    0.852 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.739121   ( 0.739121   0.739121 )
beta        : -0.751524    ( -0.489399   0.572747 )
Epeak [keV] : 17.4414      ( -17.4414 -17.4414 )
Norm@50keV   : 5.64934E-03    ( -0.00289825   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.44 using 59 PHA bins.
# Reduced chi-squared =         0.9353 for     55 degrees of freedom 
# Null hypothesis probability =   6.113315e-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]    : 26.4742  (-7.50848  14.9994)
R^2/D10^2   : 1.00831E-02  (-0.0100831   0.0183016)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.93 using 59 PHA bins.
# Reduced chi-squared =         0.8936 for     57 degrees of freedom 
# Null hypothesis probability =   7.007568e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.190e-09   7.530e-10
25- 50  6.944e-09   4.177e-09
50-150  3.572e-08   2.178e-08
15-150  4.385e-08   2.733e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-75.8206      -200)
Norm        : 1.88039       (-0.58151     0.58151)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.54 using 59 PHA bins.
# Reduced chi-squared =          1.027 for     57 degrees of freedom 
# Null hypothesis probability =   4.188164e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.687e-09   2.930e-09
25- 50  9.015e-09   5.585e-09
50-150  1.977e-08   1.222e-08
15-150  3.347e-08   2.019e-08

Double BB

# Reduced chi-squared =         0.8818 for     55 degrees of freedom 
# Reduced chi-squared =         0.8805 for     55 degrees of freedom 
# Reduced chi-squared =         0.8799 for     55 degrees of freedom 
# Reduced chi-squared =         0.8795 for     55 degrees of freedom 
# Reduced chi-squared =         0.8793 for     55 degrees of freedom 
# Null hypothesis probability =   6.306778e-01
# Null hypothesis probability =   7.070458e-01
# Null hypothesis probability =   7.149837e-01
# Null hypothesis probability =   7.196665e-01
# Null hypothesis probability =   7.220971e-01
# Null hypothesis probability =   7.233681e-01
# Null hypothesis probability =   7.240190e-01
# Null hypothesis probability =   7.243889e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  0.000e+00   0.000e+00
25- 50  0.000e+00   0.000e+00
50-150  0.000e+00   0.000e+00
15-150  0.000e+00   0.000e+00

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

S(25-50 keV)  = 7.53e-09
S(50-100 keV) = 1.65e-08

T90 vs. Hardness ratio plot

T90                                   = 0.576000034809113 sec.
Hardness ratio (energy fluence ratio) = 2.19124

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 2.375
Count Ratio (50-100 keV) / (15-25 keV) = 3.125

Mask shadow pattern

IMX = -0.216228511386, IMY = -0.29621946837

TIME vs. PHA plot around the beginning of event data (event_start to event_start+0.64s)

TIME vs. DetID plot around the beginning of event data (event_start to event_start+0.64s)

100 us light curve (15-350 keV; (event_start to event_start+0.64s)

Spacecraft aspect plot

Bright source in the event data image

Event data image of 15-350 keV band

Time interval of the image:
0.000000 0.704000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.3741 -40.4933    4.6  29.1  -94.9   0.0327   2.6    8.0	Vela X-1                      
170.0175 -60.5111    7.4  23.3  -26.5  -0.0136  -1.6   11.1	Cen X-3                       
186.5425 -62.9510    9.3  27.7  -10.4  -0.0116  -1.2   11.3	GX 301-2                      
 64.4995 -65.9451    1.7  20.1  126.0   0.0684   6.9 ------	UNKNOWN                       
156.8843 -32.3192    2.5  42.2  -70.8   0.1560   4.6 ------	UNKNOWN

Webpage updated on:
Wed Nov 25 14:24:50 EST 2015