batgrbproduct analysis for trigger=03110538005

Analysis for Ground-detected GRB191130A

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) When spectral analysis covers slew times, the analysis uses an average response file made by some sub-response-files with a 5-s time interval during slew times.

==========================================================================
           BAT GROUND-DETECTED GRB DATA PROCESSING REPORT                 
            (This burst occurred during telescope slew)                  
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Dec  2 18:34:21 EST 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/GRB191130A
======================================================================

  Trigger: 03110538      Segment: 005

  BAT Trigger Time: 596811926.3760002
               UTC: 2019-11-30T13:05:02.316   [includes UTCF correction]
       Where From?: Ground analysis (best_duration.txt)
  NOTE: BAT trigger time for ground-detected burst during slew is the T100 start time.
 
  Analysis Position:   [ source = GCN ]
    RA: 133.07925219   Dec: 4.99580463  [deg; J2000]
 
  Refined Position:   [ source = BAT mosaic image ]
    RA: 133.07935975635   Dec: 4.99574603683784  [deg; J2000]
        { 08h 52m 19.0s , +04d 59' 44.7" }
        +/- 1.16224621055 [arcmin] (estimated 90% radius based on SNR)
    SNR: 24.54099359834793
 
  Angular difference between the GCN position (ra=133.07925219, dec=4.99580463 deg) and this refined position is 0.007 arcmin
 
  Partial Coding Fraction: Unavailable because the burst occurred during slew.
 
  Duration
     T90: 17.5599999427795 +/- 2.87687051441905
        Measured from: 2.08
                   to: 19.64     [s; relative to TRIGTIME]
     T50: 6.00399994850159 +/- 1.28069497394174
        Measured from: 6.32
                   to: 12.324     [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 1.46e-07 2.04e-07 2.10e-07 3.97e-07 6.86e-07 9.57e-07   erg/cm2
              Error 1.45e-08 1.36e-08 2.41e-08 9.15e-08 5.50e-08 1.16e-07   erg/cm2
Peak flux Power-law 4.70e-01 3.82e-01 2.10e-01 1.69e-01 1.14e+00 1.23e+00   ph/cm2/s
              Error 9.33e-02 5.21e-02 4.78e-02 7.41e-02 1.55e-01 1.73e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.39e-07 2.16e-07 2.05e-07 1.61e-07 6.46e-07 7.21e-07   erg/cm2
              Error 1.63e-08 1.82e-08 2.72e-08 1.56e-07 6.52e-08 1.72e-07   erg/cm2
Peak flux Cutoff-PL 4.78e-01 3.71e-01 2.00e-01 1.79e-01 1.12e+00 1.22e+00   ph/cm2/s
              Error 1.00e-01 6.99e-02 3.21e-02 1.25e-01 2.10e-01 2.23e-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    1.954    0.129    -      -           3.38e-03 2.79e-04   45.020 57
CPL   1.428    0.552      45.9   44.5      6.74e-03 5.55e-03   41.930 56
 
The chi2 of BB fit is Chi-Squared which shows a significant improvement in the fit over a PL.
Check the BB fit.
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.865    0.260    -      -           8.04e-03 1.38e-03   45.640 57
CPL   1.818    0.893     167.7    0.0      8.55e-03 0.00e+00   45.630 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   22.052    0.000   22.052
T90    17.560    2.080   19.640
T50     6.004    6.320   12.324
Peak    1.000    6.176    7.176

Click here for the BAT GCN circular template

Special notes of this burst

Image

Note1: The mosaic image is made with timebin = 0.1 s; energybin = 15-350 keV

Note2: The mosaic image uses Galactic coordinate.

#RAcent DECcent POSerr Theta  Phi  Peak_Cts  SNR Name
133.079 4.996 0.003 40.302 -39.248 0.054 24.541 UNKNOWN
 
Image time interval: -1.376 to 18.624 [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   22.052 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.95436     ( -0.127478   0.131518 )
Norm@50keV  : 3.38070E-03    ( -0.000281334   0.000277328 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.02 using 59 PHA bins.
# Reduced chi-squared =         0.7899 for     57 degrees of freedom 
# Null hypothesis probability =   8.744701e-01
 
Photon flux (15-150 keV)    in 22.05 sec: 0.496788 ( -0.033502  0.033519 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.86211e-07 ( -5.45729e-08  5.54207e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.000 sec. to   22.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.42773     ( -0.590938   0.512311 )
Epeak [keV] : 45.9004      ( -15.3937 73.6906 )
Norm@50keV  : 6.74348E-03    ( -0.0032373   0.00785628 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.93 using 59 PHA bins.
# Reduced chi-squared =         0.7488 for     56 degrees of freedom 
# Null hypothesis probability =   9.186729e-01
 
Photon flux (15-150 keV)    in 22.05 sec: 0.484359 ( -0.0355  0.035513 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.4711e-07 ( -6.42444e-08  6.62003e-08 ) ergs/cm2

Band function

Time interval is from   -0.000 sec. to   22.052 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  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]    : 10.0348  (-0.800118  0.884683)
R^2/D10^2   : 0.223842  (-0.0620322   0.0846058)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          81.03 using 59 PHA bins.
# Reduced chi-squared =          1.422 for     57 degrees of freedom 
# Null hypothesis probability =   1.990796e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.013e-07   1.165e-08
25- 50  2.532e-07   1.962e-08
50-150  1.335e-07   2.527e-08
15-150  4.880e-07   4.057e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 71.5482       (-14.3544      20.5402)
Norm        : 2.40798       (-0.257854     0.29879)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.01 using 59 PHA bins.
# Reduced chi-squared =         0.7370 for     57 degrees of freedom 
# Null hypothesis probability =   9.314461e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.365e-07   1.299e-08
25- 50  2.185e-07   1.486e-08
50-150  2.852e-07   5.402e-08
15-150  6.402e-07   5.424e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.39423        (-1.20348      1.1944)
R1^2/D10^2  : 0.904821        (-0.396998      0.556793)
kT2 [keV]   : 21.3144        (-4.92052      8.65692)
R2^2/D10^2  : 8.53477E-03    (-0.00617614   0.0166144)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.94 using 59 PHA bins.
# Reduced chi-squared =         0.7444 for     55 degrees of freedom 
# Null hypothesis probability =   9.207648e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.342e-07   2.943e-08
25- 50  2.181e-07   5.072e-08
50-150  2.981e-07   1.506e-07
15-150  6.504e-07   1.799e-07

Peak spectrum fit

Power-law model

Time interval is from    0.000 sec. to    0.000 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.86494     ( -0.250394   0.26887 )
Norm@50keV  : 8.04000E-03    ( -0.00140397   0.00135459 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.64 using 59 PHA bins.
# Reduced chi-squared =         0.8006 for     57 degrees of freedom 
# Null hypothesis probability =   8.601656e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.13710 ( -0.154913  0.15491 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.39265e-08 ( -1.25489e-08  1.28895e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.000 sec. to    0.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.81801     ( -0.988402   0.796882 )
Epeak [keV] : 167.711      (   )
Norm@50keV  : 8.55296E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.63 using 59 PHA bins.
# Reduced chi-squared =         0.8148 for     56 degrees of freedom 
# Null hypothesis probability =   8.374653e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.12072 ( -0.249937  0.16911 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.35631e-08 ( -1.41134e-08  1.27685e-08 ) ergs/cm2

Band function

Time interval is from    0.000 sec. to    0.000 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  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]    : 10.3620  (-1.89345  2.34936)
R^2/D10^2   : 0.457982  (-0.45616   0.514438)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.21 using 59 PHA bins.
# Reduced chi-squared =          1.109 for     57 degrees of freedom 
# Null hypothesis probability =   2.664826e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.013e-08   2.427e-09
25- 50  2.645e-08   5.310e-09
50-150  1.529e-08   5.769e-09
15-150  5.187e-08   1.132e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 87.7946       (-34.4333      81.9154)
Norm        : 5.19174       (-0.949953     1.27366)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.47 using 59 PHA bins.
# Reduced chi-squared =         0.8153 for     57 degrees of freedom 
# Null hypothesis probability =   8.390223e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.354e-08   2.735e-09
25- 50  2.277e-08   3.870e-09
50-150  3.414e-08   1.864e-08
15-150  7.044e-08   2.240e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.84600        (-1.41759      2.06514)
R1^2/D10^2  : 5.94469        (-4.39187      12.1986)
kT2 [keV]   : 20.0884        (-5.68304      12.2672)
R2^2/D10^2  : 3.13056E-02    (-0.0256824   0.044568)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.90 using 59 PHA bins.
# Reduced chi-squared =         0.8163 for     55 degrees of freedom 
# Null hypothesis probability =   8.327169e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.517e-08   7.945e-09
25- 50  1.984e-08   9.704e-09
50-150  3.662e-08   2.153e-08
15-150  7.163e-08   3.455e-08

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

S(25-50 keV)  = 2.04e-07
S(50-100 keV) = 2.10e-07

T90 vs. Hardness ratio plot

T90                                   = 17.5599999427795 sec.
Hardness ratio (energy fluence ratio) = 1.02941

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.08471
Count Ratio (50-100 keV) / (15-25 keV) = 0.555785

Mask shadow pattern

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

Webpage updated on:
Mon Dec  2 19:58:12 EST 2019