batgrbproduct Analysis for Trigger=666931
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 Dec 11 10:46:53 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger666931/batgroup_hand_proc
======================================================================
Trigger: 00666931 Segment: 000
BAT Trigger Time: 471409992 [s; MET]
Trigger Stop: 471410072 [s; MET]
UTC: 2015-12-10T03:12:56.468160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 65.1823076169024 Dec: -71.2304208518608 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.24
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.24
Flight Position: [ source = BAT ]
RA: 65.1823076169024 Dec: -71.2304208518608 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 65.0917144339244 Dec: -71.2259065359814 [deg; J2000]
{ 04h 20m 22.0s , -71d 13' 33.3" }
+/- 1.73673073644375 [arcmin] (estimated 90% radius based on SNR)
+/- 0.720244680332166 [arcmin] (formal 1-sigma fit error)
SNR: 13.8243077609376
Angular difference between Flight and Ground position is 1.770022 arcmin
Partial Coding Fraction: 0.609375 [ including projection effects ]
Duration
T90: 87.0119999647141 +/- 10.5867564320001
Measured from: -38.772000014782
to: 48.2399999499321 [s; relative to TRIGTIME]
T50: 56.6479999423027 +/- 4.8916373107356
Measured from: -17.3479999899864
to: 39.2999999523163 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 38.8199999928474
to: 39.8199999928474 [s; relative to TRIGTIME]
Total Fluence
Measured from: -57.1959999799728
to: 52.7120000123978 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.930342 1.054448 0.500603 0.149541
0.073541 0.073989 0.064678 0.057112 [error]
Peak 0.029231 0.032553 0.036439 0.014289
0.007683 0.008188 0.007273 0.006031 [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 3.02e-07 4.24e-07 4.42e-07 8.44e-07 1.43e-06 2.01e-06 erg/cm2
Error 3.65e-08 3.50e-08 6.19e-08 2.36e-07 1.42e-07 3.01e-07 erg/cm2
Peak flux Power-law 2.36e-01 2.61e-01 2.06e-01 2.68e-01 8.03e-01 9.71e-01 ph/cm2/s
Error 9.23e-02 6.57e-02 5.64e-02 1.48e-01 1.87e-01 2.31e-01 ph/cm2/s
Fluence Cutoff-PL 2.86e-07 4.54e-07 4.30e-07 3.16e-07 1.35e-06 1.49e-06 erg/cm2
Error 4.13e-08 4.94e-08 7.12e-08 3.74e-07 1.70e-07 4.68e-07 erg/cm2
Peak flux Cutoff-PL 1.96e-01 2.86e-01 2.26e-01 1.06e-01 7.78e-01 8.14e-01 ph/cm2/s
Error 1.08e-01 7.99e-02 6.77e-02 1.97e-01 1.91e-01 2.65e-01 ph/cm2/s
Fluence Band 2.79e-07 4.61e-07 4.16e-07 5.40e-07 1.36e-06 1.70e-06 erg/cm2
Error 4.21e-08 -------- 7.22e-08 -------- -------- -------- erg/cm2
Peak flux Band 2.08e-01 2.79e-01 2.22e-01 1.37e-01 7.89e-01 8.46e-01 ph/cm2/s
Error -------- -------- 6.32e-02 -------- 1.92e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.942 0.156 - - 1.42e-03 1.44e-04 53.800 57
CPL 1.362 0.726 46.2 0.0 3.05e-03 0.00e+00 51.680 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 1.344 0.373 - - 6.67e-03 1.54e-03 39.910 57
CPL 0.344 1.469 85.1 -30.2 2.09e-02 9.65e-02 38.490 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: 33.088000 sec.
T50 in the 50-300 keV band: 25.792000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 109.908 -57.196 52.712
T90 87.012 -38.772 48.240
T50 56.648 -17.348 39.300
Peak 1.000 38.820 39.820
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
65.0917 -71.2259 0.0139 24.1212 -87.4843 1.7382243 13.824 TRIG_00666931
Foreground time interval of the image:
-10.499 52.712 (delta_t = 63.211 [sec])
Background time interval of the image:
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 -57.196 sec. to 52.712 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94232 ( -0.153307 0.159462 )
Norm@50keV : 1.41888E-03 ( -0.00014527 0.000142704 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.80 using 59 PHA bins.
# Reduced chi-squared = 0.9438 for 57 degrees of freedom
# Null hypothesis probability = 5.960524e-01
Photon flux (15-150 keV) in 109.9 sec: 0.207381 ( -0.0171856 0.0171924 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4347e-06 ( -1.40839e-07 1.43146e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -57.196 sec. to 52.712 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36193 ( -0.808488 0.643568 )
Epeak [keV] : 46.2102 ( )
Norm@50keV : 3.05170E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.68 using 59 PHA bins.
# Reduced chi-squared = 0.9228 for 56 degrees of freedom
# Null hypothesis probability = 6.391479e-01
Photon flux (15-150 keV) in 109.9 sec: 0.202197 ( -0.018221 0.018171 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34769e-06 ( -1.6663e-07 1.73983e-07 ) ergs/cm2
Band function
Time interval is from -57.196 sec. to 52.712 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.04621 ( -0.937104 1.0457 )
beta : -2.33119 ( 2.34316 0.439811 )
Epeak [keV] : 40.8462 ( -20.4429 28.2131 )
Norm@50keV : 4.87510E-03 ( -0.00491378 171.416 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.88 using 59 PHA bins.
# Reduced chi-squared = 0.9251 for 55 degrees of freedom
# Null hypothesis probability = 6.326907e-01
Photon flux (15-150 keV) in 109.9 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36054e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.3062 (-0.957041 1.05675)
R^2/D10^2 : 8.58739E-02 (-0.0266908 0.0386686)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.25 using 59 PHA bins.
# Reduced chi-squared = 1.303 for 57 degrees of freedom
# Null hypothesis probability = 6.211783e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.061e-07 3.088e-08
25- 50 5.345e-07 5.347e-08
50-150 3.042e-07 6.885e-08
15-150 1.045e-06 1.033e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 72.3852 (-17.1368 26.5458)
Norm : 1.00502 (-0.128066 0.152086)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.65 using 59 PHA bins.
# Reduced chi-squared = 0.9062 for 57 degrees of freedom
# Null hypothesis probability = 6.751906e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.843e-07 3.352e-08
25- 50 4.564e-07 3.830e-08
50-150 6.008e-07 1.335e-07
15-150 1.342e-06 1.676e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.93922 (-2.51171 3.017)
R1^2/D10^2 : 0.446080 (-0.303545 3.06888)
kT2 [keV] : 17.8126 (-10.6638 54.8362)
R2^2/D10^2 : 7.34943E-03 (-0.00675544 0.0295051)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.29 using 59 PHA bins.
# Reduced chi-squared = 0.9871 for 55 degrees of freedom
# Null hypothesis probability = 5.016779e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.779e-07 1.237e-07
25- 50 4.570e-07 1.908e-07
50-150 5.619e-07 2.959e-07
15-150 1.297e-06 5.076e-07
Peak spectrum fit
Power-law model
Time interval is from 38.820 sec. to 39.820 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34351 ( -0.374551 0.372333 )
Norm@50keV : 6.67243E-03 ( -0.00154499 0.00153992 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.91 using 59 PHA bins.
# Reduced chi-squared = 0.7002 for 57 degrees of freedom
# Null hypothesis probability = 9.583349e-01
Photon flux (15-150 keV) in 1 sec: 0.802774 ( -0.187164 0.187688 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.52633e-08 ( -1.64608e-08 1.67697e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 38.820 sec. to 39.820 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.344440 ( -2.04826 0.890401 )
Epeak [keV] : 85.0590 ( -24.6217 -85.0555 )
Norm@50keV : 2.08991E-02 ( -0.0209012 0.172042 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.49 using 59 PHA bins.
# Reduced chi-squared = 0.6873 for 56 degrees of freedom
# Null hypothesis probability = 9.642721e-01
Photon flux (15-150 keV) in 1 sec: 0.778214 ( -0.191021 0.191209 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.16576e-08 ( -1.70997e-08 1.76482e-08 ) ergs/cm2
Band function
Time interval is from 38.820 sec. to 39.820 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.328714 ( -0.560682 2.99963 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 84.2530 ( -30.6698 431.283 )
Norm@50keV : 2.13482E-02 ( -0.0213301 0.173174 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.49 using 59 PHA bins.
# Reduced chi-squared = 0.6998 for 55 degrees of freedom
# Null hypothesis probability = 9.555568e-01
Photon flux (15-150 keV) in 1 sec: 0.789252 ( 6.21075 -0.203099 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.1731e-08 ( -6.1724e-08 -1.71533e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.7780 (-4.05507 5.56315)
R^2/D10^2 : 6.67384E-02 (-0.0418504 0.105154)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.71 using 59 PHA bins.
# Reduced chi-squared = 0.7143 for 57 degrees of freedom
# Null hypothesis probability = 9.491635e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.840e-09 1.644e-09
25- 50 1.681e-08 7.833e-09
50-150 3.364e-08 1.634e-08
15-150 5.429e-08 2.430e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.356 (-52.8063 -199.36)
Norm : 3.33734 (-0.765492 0.767043)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.07 using 59 PHA bins.
# Reduced chi-squared = 0.7029 for 57 degrees of freedom
# Null hypothesis probability = 9.566875e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.310e-09 5.050e-09
25- 50 1.599e-08 9.270e-09
50-150 3.506e-08 2.098e-08
15-150 5.936e-08 3.479e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.92076 (-6.99385 -6.99385)
R1^2/D10^2 : 0.625996 (-0.618241 -0.618241)
kT2 [keV] : 22.9447 (-23.0344 -23.0344)
R2^2/D10^2 : 1.88273E-02 (-0.0185878 0.0777795)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.10 using 59 PHA bins.
# Reduced chi-squared = 0.6927 for 55 degrees of freedom
# Null hypothesis probability = 9.598543e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.558e-09 4.010e-09
25- 50 1.612e-08 8.925e-09
50-150 3.933e-08 2.261e-08
15-150 6.201e-08 3.364e-08
Plot creation:
Fri Dec 11 10:55:24 EST 2015