batgrbproduct Analysis for Trigger=671231
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Fri Jan 22 15:50:24 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger671231/GCN5_download_cron
======================================================================
Trigger: 00671231 Segment: 000
BAT Trigger Time: 475077053.44 [s; MET]
Trigger Stop: 475077054.464 [s; MET]
UTC: 2016-01-21T13:50:37.710700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 109.079402870934 Dec: -23.578027813169 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.25
Image Trigger?: NO
Rate S/N Ratio: 10.0498756211209 [ if not an image trigger ]
Image S/N Ratio: 7.25
Flight Position: [ source = BAT ]
RA: 109.079402870934 Dec: -23.578027813169 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 109.079721385807 Dec: -23.5901181829125 [deg; J2000]
{ 07h 16m 19.1s , -23d 35' 24.4" }
+/- 1.1874167712587 [arcmin] (estimated 90% radius based on SNR)
+/- 0.426302490735641 [arcmin] (formal 1-sigma fit error)
SNR: 23.7981068685425
Angular difference between Flight and Ground position is 0.725634 arcmin
Partial Coding Fraction: 0.9140625 [ including projection effects ]
Duration
T90: 12.0359999537468 +/- 2.38388672767792
Measured from: 0.524000108242035
to: 12.5600000619888 [s; relative to TRIGTIME]
T50: 4.30399996042252 +/- 0.967803687827393
Measured from: 2.55200010538101
to: 6.85600006580353 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.75999999046326
to: 3.75999999046326 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0279999971389771
to: 14.972000002861 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.348355 0.427770 0.258665 0.067039
0.026281 0.027357 0.022704 0.018454 [error]
Peak 0.046856 0.061370 0.029905 0.008338
0.007110 0.007479 0.006098 0.005095 [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 1.10e-07 1.71e-07 2.00e-07 4.51e-07 6.12e-07 9.32e-07 erg/cm2
Error 1.24e-08 1.26e-08 2.20e-08 1.01e-07 5.18e-08 1.22e-07 erg/cm2
Peak flux Power-law 4.74e-01 3.95e-01 2.24e-01 1.88e-01 1.18e+00 1.28e+00 ph/cm2/s
Error 9.90e-02 5.76e-02 4.95e-02 7.88e-02 1.72e-01 1.90e-01 ph/cm2/s
Fluence Cutoff-PL 1.00e-07 1.85e-07 2.01e-07 1.55e-07 5.75e-07 6.42e-07 erg/cm2
Error 1.44e-08 1.69e-08 2.45e-08 1.30e-07 5.79e-08 1.42e-07 erg/cm2
Peak flux Cutoff-PL 4.35e-01 4.41e-01 2.25e-01 6.40e-02 1.15e+00 1.17e+00 ph/cm2/s
Error 1.12e-01 8.11e-02 5.77e-02 1.11e-01 1.74e-01 1.97e-01 ph/cm2/s
Fluence Band 9.92e-08 1.85e-07 1.99e-07 2.17e-07 5.75e-07 7.02e-07 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 1.773 0.130 - - 4.43e-03 3.62e-04 46.570 57
CPL 1.046 0.589 59.6 28.0 1.10e-02 9.19e-03 41.270 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.820 0.251 - - 8.46e-03 1.45e-03 56.260 57
CPL 0.928 1.190 51.5 -18.1 2.74e-02 8.44e-02 54.180 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: 8.576000 sec.
T50 in the 50-300 keV band: 4.352000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 15.000 -0.028 14.972
T90 12.036 0.524 12.560
T50 4.304 2.552 6.856
Peak 1.000 2.760 3.760
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
109.0797 -23.5901 0.0080 22.8 7.7 0.9790 23.8 TRIG_00671231
------------------------------------------
Foreground time interval of the image:
-0.028 10.461 (delta_t = 10.489 [sec])
Background time interval of the image:
-239.440 -0.028 (delta_t = 239.412 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) 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.
- 5) 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.
- 6) 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
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)
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 -0.028 sec. to 14.972 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77290 ( -0.128593 0.131498 )
Norm@50keV : 4.43017E-03 ( -0.000363944 0.000360132 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.57 using 59 PHA bins.
# Reduced chi-squared = 0.8170 for 57 degrees of freedom
# Null hypothesis probability = 8.365760e-01
Photon flux (15-150 keV) in 15 sec: 0.604172 ( -0.0450322 0.045068 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.1245e-07 ( -5.15175e-08 5.20206e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.028 sec. to 14.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04558 ( -0.629315 0.549344 )
Epeak [keV] : 59.5537 ( -11.254 44.779 )
Norm@50keV : 1.10123E-02 ( -0.00538856 0.0129879 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.27 using 59 PHA bins.
# Reduced chi-squared = 0.7369 for 56 degrees of freedom
# Null hypothesis probability = 9.295638e-01
Photon flux (15-150 keV) in 15 sec: 0.586103 ( -0.046998 0.046992 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.74995e-07 ( -5.72295e-08 5.85735e-08 ) ergs/cm2
Band function
Time interval is from -0.028 sec. to 14.972 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.02385 ( -0.567175 5.91393 )
beta : -2.62664 ( 2.64884 0.817285 )
Epeak [keV] : 58.7313 ( -31.3456 41.1106 )
Norm@50keV : 1.13474E-02 ( -0.00585241 0.402545 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.20 using 59 PHA bins.
# Reduced chi-squared = 0.7491 for 55 degrees of freedom
# Null hypothesis probability = 9.162328e-01
Photon flux (15-150 keV) in 15 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.75494e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.0814 (-1.02085 1.12221)
R^2/D10^2 : 0.143059 (-0.0404461 0.0557494)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.29 using 59 PHA bins.
# Reduced chi-squared = 1.251 for 57 degrees of freedom
# Null hypothesis probability = 9.649141e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.628e-08 9.818e-09
25- 50 2.103e-07 1.912e-08
50-150 1.854e-07 3.312e-08
15-150 4.619e-07 3.930e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 104.293 (-25.0951 39.3826)
Norm : 2.65179 (-0.259255 0.302288)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.76 using 59 PHA bins.
# Reduced chi-squared = 0.7326 for 57 degrees of freedom
# Null hypothesis probability = 9.351569e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.040e-07 1.261e-08
25- 50 1.812e-07 1.448e-08
50-150 3.007e-07 1.043e-07
15-150 5.859e-07 1.136e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.93856 (-1.62072 1.99772)
R1^2/D10^2 : 1.12759 (-0.673088 2.52343)
kT2 [keV] : 18.6943 (-3.49877 7.05159)
R2^2/D10^2 : 2.16064E-02 (-0.0158318 0.0300085)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.69 using 59 PHA bins.
# Reduced chi-squared = 0.7581 for 55 degrees of freedom
# Null hypothesis probability = 9.071389e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.005e-07 3.944e-08
25- 50 1.826e-07 5.494e-08
50-150 2.792e-07 1.199e-07
15-150 5.623e-07 2.021e-07
Peak spectrum fit
Power-law model
Time interval is from 2.760 sec. to 3.760 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81957 ( -0.243858 0.258155 )
Norm@50keV : 8.46308E-03 ( -0.00146786 0.00143144 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.26 using 59 PHA bins.
# Reduced chi-squared = 0.9870 for 57 degrees of freedom
# Null hypothesis probability = 5.027712e-01
Photon flux (15-150 keV) in 1 sec: 1.17516 ( -0.171563 0.17159 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.78645e-08 ( -1.34257e-08 1.37288e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.760 sec. to 3.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.928328 ( -1.37009 1.00911 )
Epeak [keV] : 51.4712 ( -15.3326 -51.4711 )
Norm@50keV : 2.74029E-02 ( -0.0274031 0.141327 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.18 using 59 PHA bins.
# Reduced chi-squared = 0.9674 for 56 degrees of freedom
# Null hypothesis probability = 5.442207e-01
Photon flux (15-150 keV) in 1 sec: 1.14939 ( -0.174195 0.17423 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.21095e-08 ( -1.40932e-08 1.51563e-08 ) ergs/cm2
Band function
Time interval is from 2.760 sec. to 3.760 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.990471 ( 0.990471 0.990471 )
beta : -6.07551 ( 4.59793 14.5979 )
Epeak [keV] : 52.1614 ( -52.1611 -52.1611 )
Norm@50keV : 2.52331E-02 ( -0.0252715 1.89507e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.18 using 59 PHA bins.
# Reduced chi-squared = 0.9852 for 55 degrees of freedom
# Null hypothesis probability = 5.057844e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.23077e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.0594 (-1.69695 2.03769)
R^2/D10^2 : 0.396719 (-0.187245 0.341026)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.19 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 57 degrees of freedom
# Null hypothesis probability = 3.281281e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.015e-08 2.408e-09
25- 50 2.890e-08 6.205e-09
50-150 2.005e-08 6.705e-09
15-150 5.909e-08 1.297e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 88.9909 (-33.1904 77.9584)
Norm : 5.42175 (-1.0225 1.30122)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.46 using 59 PHA bins.
# Reduced chi-squared = 0.9555 for 57 degrees of freedom
# Null hypothesis probability = 5.708280e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.414e-08 2.860e-09
25- 50 2.386e-08 4.390e-09
50-150 3.608e-08 1.904e-08
15-150 7.408e-08 2.231e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.93201 (-3.30257 3.95417)
R1^2/D10^2 : 2.29953 (-1.78557 3.8647)
kT2 [keV] : 17.6427 (-5.8854 44.0509)
R2^2/D10^2 : 4.97393E-02 (-0.0489956 0.238056)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.33 using 59 PHA bins.
# Reduced chi-squared = 0.9878 for 55 degrees of freedom
# Null hypothesis probability = 5.001350e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.369e-08 7.465e-09
25- 50 2.449e-08 1.232e-08
50-150 3.283e-08 1.858e-08
15-150 7.102e-08 3.743e-08
Plot creation:
Fri Jan 22 15:55:22 EST 2016