batgrbproduct Analysis for Trigger=668543
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): Tue Dec 29 09:53:39 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger668543/batgroup_hand_proc
======================================================================
Trigger: 00668543 Segment: 000
BAT Trigger Time: 472964728 [s; MET]
Trigger Stop: 472964728.256 [s; MET]
UTC: 2015-12-28T03:05:12.384680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 214.003951052387 Dec: -17.6890004436844 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.53
Image Trigger?: NO
Rate S/N Ratio: 36.8510515453766 [ if not an image trigger ]
Image S/N Ratio: 6.53
Flight Position: [ source = BAT ]
RA: 214.003951052387 Dec: -17.6890004436844 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 214.016860789574 Dec: -17.664630711655 [deg; J2000]
{ 14h 16m 04.0s , -17d 39' 52.7" }
+/- 1.82005449228883 [arcmin] (estimated 90% radius based on SNR)
+/- 0.689692793923051 [arcmin] (formal 1-sigma fit error)
SNR: 12.9291284480868
Angular difference between Flight and Ground position is 1.637878 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 0.275999963283539 +/- 0.039999997615816
Measured from: -0.0279999971389771
to: 0.247999966144562 [s; relative to TRIGTIME]
T50: 0.12799996137619 +/- 0.0384187534673386
Measured from: 0.0199999809265137
to: 0.147999942302704 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.378000020980835
to: 0.621999979019165 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0360000133514404
to: 0.276000022888184 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.013137 0.043794 0.042769 0.007337
0.003875 0.004429 0.004680 0.004019 [error]
Peak 0.014847 0.042095 0.042798 0.009751
0.006443 0.006703 0.006414 0.005544 [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 5.09e-09 1.40e-08 3.12e-08 1.83e-07 8.40e-08 2.34e-07 erg/cm2
Error 1.19e-09 2.00e-09 4.17e-09 5.52e-08 1.13e-08 5.76e-08 erg/cm2
Peak flux Power-law 1.78e-01 2.53e-01 2.66e-01 5.18e-01 8.59e-01 1.22e+00 ph/cm2/s
Error 6.49e-02 5.61e-02 4.92e-02 2.12e-01 1.52e-01 2.38e-01 ph/cm2/s
Fluence Cutoff-PL 3.92e-09 1.53e-08 3.45e-08 4.87e-08 7.81e-08 1.02e-07 erg/cm2
Error 1.41e-09 2.43e-09 5.14e-09 5.33e-08 1.26e-08 5.36e-08 erg/cm2
Peak flux Cutoff-PL 1.56e-01 2.58e-01 2.81e-01 3.27e-01 8.42e-01 1.02e+00 ph/cm2/s
Error 7.94e-02 6.11e-02 6.10e-02 3.03e-01 1.57e-01 3.36e-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 0.847 0.200 - - 2.35e-02 2.84e-03 50.310 57
CPL -0.317 1.010 110.4 99.5 8.01e-02 1.09e-01 45.110 56
The chi2 of BB fit is Chi-Squared 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 0.925 0.308 - - 7.49e-03 1.31e-03 43.880 57
CPL 0.444 1.025 188.2 0.0 1.22e-02 1.95e-02 43.360 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: 0.192000 sec.
T50 in the 50-300 keV band: 0.128000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.312 -0.036 0.276
T90 0.276 -0.028 0.248
T50 0.128 0.020 0.148
Peak 1.000 -0.378 0.622
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
214.0169 -17.6646 0.0149 14.2249 -167.1703 0.1133904 12.929 TRIG_00668543
Foreground time interval of the image:
-0.036 0.276 (delta_t = 0.312 [sec])
Background time interval of the image:
-67.499 -0.036 (delta_t = 67.463 [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 -0.036 sec. to 0.276 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.846788 ( -0.203166 0.197119 )
Norm@50keV : 2.34903E-02 ( -0.00284229 0.00283576 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.31 using 59 PHA bins.
# Reduced chi-squared = 0.8826 for 57 degrees of freedom
# Null hypothesis probability = 7.223306e-01
Photon flux (15-150 keV) in 0.312 sec: 2.69661 ( -0.324652 0.324868 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.40072e-08 ( -1.12762e-08 1.14001e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.036 sec. to 0.276 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.317288 ( -1.12471 0.895566 )
Epeak [keV] : 110.374 ( -30.416 168.606 )
Norm@50keV : 8.01071E-02 ( -0.0482036 0.16984 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.11 using 59 PHA bins.
# Reduced chi-squared = 0.8056 for 56 degrees of freedom
# Null hypothesis probability = 8.508038e-01
Photon flux (15-150 keV) in 0.312 sec: 2.58840 ( -0.33622 0.33587 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.80839e-08 ( -1.26223e-08 1.2611e-08 ) ergs/cm2
Band function
Time interval is from -0.036 sec. to 0.276 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.277399 ( -0.851607 0.810341 )
beta : -9.37166 ( 9.37167 19.3717 )
Epeak [keV] : 113.008 ( -43.629 124.574 )
Norm@50keV : 7.63879E-02 ( -0.0444558 0.051606 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.12 using 59 PHA bins.
# Reduced chi-squared = 0.8204 for 55 degrees of freedom
# Null hypothesis probability = 8.264917e-01
Photon flux (15-150 keV) in 0.312 sec: 2.58860 ( ) 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] : 21.8607 (-3.10015 3.87258)
R^2/D10^2 : 0.104203 (-0.0406582 0.0624323)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.77 using 59 PHA bins.
# Reduced chi-squared = 0.8381 for 57 degrees of freedom
# Null hypothesis probability = 8.029682e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.884e-09 7.045e-10
25- 50 1.519e-08 2.716e-09
50-150 5.423e-08 1.292e-08
15-150 7.231e-08 1.273e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-24.4302 -200)
Norm : 10.0847 (-1.30972 1.30972)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.17 using 59 PHA bins.
# Reduced chi-squared = 1.389 for 57 degrees of freedom
# Null hypothesis probability = 2.767612e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.835e-09 4.421e-09
25- 50 1.507e-08 8.377e-09
50-150 3.305e-08 1.817e-08
15-150 5.596e-08 3.139e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.7149 (-7.95867 -12.7149)
R1^2/D10^2 : 0.272629 (-0.226638 1.96869)
kT2 [keV] : 35.6617 (-30.9168 -35.6617)
R2^2/D10^2 : 1.65833E-02 (-0.0163884 0.0885126)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.38 using 59 PHA bins.
# Reduced chi-squared = 0.8069 for 55 degrees of freedom
# Null hypothesis probability = 8.464894e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.837e-09 2.231e-09
25- 50 1.586e-08 9.271e-09
50-150 5.970e-08 3.198e-08
15-150 7.940e-08 4.173e-08
Peak spectrum fit
Power-law model
Time interval is from -0.378 sec. to 0.622 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.925432 ( -0.316333 0.299107 )
Norm@50keV : 7.48527E-03 ( -0.00131662 0.00130585 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.88 using 59 PHA bins.
# Reduced chi-squared = 0.7699 for 57 degrees of freedom
# Null hypothesis probability = 8.986532e-01
Photon flux (15-150 keV) in 1 sec: 0.859328 ( -0.151097 0.152051 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.31899e-08 ( -1.55447e-08 1.57205e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.378 sec. to 0.622 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.444292 ( -1.42068 0.629093 )
Epeak [keV] : 188.244 ( -188.239 -188.239 )
Norm@50keV : 1.21542E-02 ( -0.005763 0.0331857 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.36 using 59 PHA bins.
# Reduced chi-squared = 0.7743 for 56 degrees of freedom
# Null hypothesis probability = 8.914355e-01
Photon flux (15-150 keV) in 1 sec: 0.842223 ( -0.156592 0.156831 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.12838e-08 ( -1.65321e-08 1.64401e-08 ) ergs/cm2
Band function
Time interval is from -0.378 sec. to 0.622 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.851427 ( 0.851391 0.851391 )
beta : -0.928229 ( -0.296604 0.318864 )
Epeak [keV] : 14.9847 ( )
Norm@50keV : 1.09335E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.88 using 59 PHA bins.
# Reduced chi-squared = 0.7979 for 55 degrees of freedom
# Null hypothesis probability = 8.590865e-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] : 23.8018 (-5.01226 7.11065)
R^2/D10^2 : 2.45989E-02 (-0.013384 0.0266152)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.27 using 59 PHA bins.
# Reduced chi-squared = 0.8292 for 57 degrees of freedom
# Null hypothesis probability = 8.175613e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.483e-09 9.925e-10
25- 50 1.373e-08 4.648e-09
50-150 5.799e-08 2.117e-08
15-150 7.420e-08 2.419e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-46.0867 -200)
Norm : 3.43735 (-0.626826 0.626826)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.94 using 59 PHA bins.
# Reduced chi-squared = 0.9639 for 57 degrees of freedom
# Null hypothesis probability = 5.527494e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.563e-09 4.965e-09
25- 50 1.647e-08 9.520e-09
50-150 3.613e-08 2.072e-08
15-150 6.116e-08 3.550e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.89096 (-3.87724 7.13266)
R1^2/D10^2 : 0.363694 (-0.313619 3.18032)
kT2 [keV] : 33.2195 (-10.2949 47.3308)
R2^2/D10^2 : 7.84624E-03 (-0.00713167 0.0151291)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.22 using 59 PHA bins.
# Reduced chi-squared = 0.7677 for 55 degrees of freedom
# Null hypothesis probability = 8.966962e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.322e-09 3.167e-09
25- 50 1.507e-08 8.255e-09
50-150 6.234e-08 3.498e-08
15-150 8.274e-08 4.301e-08
Plot creation:
Tue Dec 29 10:10:42 EST 2015