batgrbproduct Analysis for Trigger=668097
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): Thu Dec 24 13:19:29 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger668097/GCN5_download_cron
======================================================================
Trigger: 00668097 Segment: 000
BAT Trigger Time: 472540808 [s; MET]
Trigger Stop: 472541128 [s; MET]
UTC: 2015-12-23T05:19:52.407520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 306.024531148319 Dec: 33.8741695771756 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.2
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.2
Flight Position: [ source = BAT ]
RA: 306.024531148319 Dec: 33.8741695771756 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 306.018292290173 Dec: 33.8819467204425 [deg; J2000]
{ 20h 24m 04.4s , +33d 52' 55.0" }
+/- 2.62998420324015 [arcmin] (estimated 90% radius based on SNR)
+/- 1.24554173413735 [arcmin] (formal 1-sigma fit error)
SNR: 7.64161798504678
Angular difference between Flight and Ground position is 0.560648 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.803401 0.669817 0.331284 0.044344
0.119939 0.122789 0.104411 0.087773 [error]
Peak 0.803401 0.669817 0.331284 0.044344
0.119939 0.122789 0.104411 0.087773 [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 2.17e-07 2.96e-07 2.98e-07 5.42e-07 9.86e-07 1.35e-06 erg/cm2
Error 5.51e-08 5.59e-08 9.89e-08 3.58e-07 2.28e-07 4.71e-07 erg/cm2
Peak flux Power-law 2.21e-02 1.67e-02 8.37e-03 6.03e-03 4.99e-02 5.31e-02 ph/cm2/s
Error 5.72e-03 3.11e-03 2.69e-03 3.69e-03 9.24e-03 1.00e-02 ph/cm2/s
Fluence Cutoff-PL 2.16e-07 3.00e-07 2.96e-07 4.33e-07 9.73e-07 1.24e-06 erg/cm2
Error 5.70e-08 6.95e-08 1.13e-07 4.83e-07 2.55e-07 5.70e-07 erg/cm2
Peak flux Cutoff-PL 2.19e-02 1.69e-02 8.35e-03 5.04e-03 4.98e-02 5.22e-02 ph/cm2/s
Error 4.55e-03 3.87e-03 2.99e-03 5.19e-03 9.40e-03 1.09e-02 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 2.16e-02 1.70e-02 8.27e-03 4.33e-03 4.92e-02 5.12e-02 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 1.992 0.357 - - 3.34e-04 8.13e-05 64.980 57
CPL 1.884 1.013 43.4 0.0 3.88e-04 0.00e+00 64.960 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.992 0.357 - - 3.34e-04 8.13e-05 64.980 57
CPL 1.884 1.013 43.4 0.0 3.88e-04 0.00e+00 64.960 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
306.0183 +33.8819 0.0253 29.4 6.4 2.1624 7.6 TRIG_00668097
------------------------------------------
Foreground time interval of the image:
0.000 320.000 (delta_t = 320.000 [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 0.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99153 ( -0.339167 0.375008 )
Norm@50keV : 3.34125E-04 ( -8.31221e-05 7.95456e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.98 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 57 degrees of freedom
# Null hypothesis probability = 2.185373e-01
Photon flux (15-150 keV) in 320 sec: 4.99245E-02 ( -0.0092448 0.00924486 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.85584e-07 ( -2.23808e-07 2.32777e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88413 ( -1.75977 0.266878 )
Epeak [keV] : 43.3610 ( )
Norm@50keV : 3.87582E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.96 using 59 PHA bins.
# Reduced chi-squared = 1.160 for 56 degrees of freedom
# Null hypothesis probability = 1.927757e-01
Photon flux (15-150 keV) in 320 sec: 4.97578E-02 ( -0.0094327 0.0093603 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.7335e-07 ( -2.67261e-07 2.42707e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.93517 ( 1.93517 1.76815 )
beta : -8.80807 ( 7.88017 17.8802 )
Epeak [keV] : 40.4661 ( -40.4661 -40.4661 )
Norm@50keV : 3.63873E-04 ( -6.73669e-05 0.000164171 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.97 using 59 PHA bins.
# Reduced chi-squared = 1.181 for 55 degrees of freedom
# Null hypothesis probability = 1.682798e-01
Photon flux (15-150 keV) in 320 sec: 4.92218E-02 ( ) 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] : 8.76606 (-1.81591 2.33051)
R^2/D10^2 : 3.83689E-02 (-0.0229961 0.0564354)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.43 using 59 PHA bins.
# Reduced chi-squared = 1.253 for 57 degrees of freedom
# Null hypothesis probability = 9.464050e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.811e-07 6.787e-08
25- 50 3.692e-07 1.191e-07
50-150 1.299e-07 7.541e-08
15-150 6.802e-07 2.243e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 64.6055 (-28.7923 78.5886)
Norm : 0.253726 (-0.0689522 0.102437)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.38 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 57 degrees of freedom
# Null hypothesis probability = 2.086326e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.063e-07 5.578e-08
25- 50 3.210e-07 8.848e-08
50-150 3.877e-07 2.180e-07
15-150 9.150e-07 3.597e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.50995 (-2.50165 2.40797)
R1^2/D10^2 : 0.101826 (-0.0674609 0.431097)
kT2 [keV] : 31.2546 (-19.0217 -32.1614)
R2^2/D10^2 : 2.10295E-04 (-0.000199797 0.000834427)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.10 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 55 degrees of freedom
# Null hypothesis probability = 1.875154e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.145e-07 1.255e-07
25- 50 3.051e-07 1.690e-07
50-150 4.571e-07 2.810e-07
15-150 9.766e-07 5.451e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99153 ( -0.339167 0.375008 )
Norm@50keV : 3.34125E-04 ( -8.31221e-05 7.95456e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.98 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 57 degrees of freedom
# Null hypothesis probability = 2.185373e-01
Photon flux (15-150 keV) in 320 sec: 4.99245E-02 ( -0.0092448 0.00924486 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.85584e-07 ( -2.23808e-07 2.32777e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88413 ( -1.75977 0.266878 )
Epeak [keV] : 43.3610 ( )
Norm@50keV : 3.87582E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.96 using 59 PHA bins.
# Reduced chi-squared = 1.160 for 56 degrees of freedom
# Null hypothesis probability = 1.927757e-01
Photon flux (15-150 keV) in 320 sec: 4.97578E-02 ( -0.0094327 0.0093603 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.7335e-07 ( -2.67261e-07 2.42707e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.93517 ( 1.93517 1.76815 )
beta : -8.80807 ( 7.88017 17.8802 )
Epeak [keV] : 40.4661 ( -40.4661 -40.4661 )
Norm@50keV : 3.63873E-04 ( -6.73669e-05 0.000164171 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.97 using 59 PHA bins.
# Reduced chi-squared = 1.181 for 55 degrees of freedom
# Null hypothesis probability = 1.682798e-01
Photon flux (15-150 keV) in 320 sec: 4.92218E-02 ( ) 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] : 8.76606 (-1.81591 2.33051)
R^2/D10^2 : 3.83689E-02 (-0.0229961 0.0564354)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.43 using 59 PHA bins.
# Reduced chi-squared = 1.253 for 57 degrees of freedom
# Null hypothesis probability = 9.464050e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.811e-07 6.115e-08
25- 50 3.692e-07 1.293e-07
50-150 1.299e-07 7.384e-08
15-150 6.802e-07 2.216e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 64.6055 (-28.7923 78.5886)
Norm : 0.253726 (-0.0689522 0.102437)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.38 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 57 degrees of freedom
# Null hypothesis probability = 2.086326e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.063e-07 5.304e-08
25- 50 3.210e-07 9.658e-08
50-150 3.877e-07 2.253e-07
15-150 9.150e-07 2.957e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.50995 (-2.50165 2.40797)
R1^2/D10^2 : 0.101826 (-0.0674609 0.431097)
kT2 [keV] : 31.2546 (-19.0254 -32.1614)
R2^2/D10^2 : 2.10295E-04 (-0.000199797 0.000834427)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.10 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 55 degrees of freedom
# Null hypothesis probability = 1.875154e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.145e-07 1.271e-07
25- 50 3.051e-07 1.701e-07
50-150 4.571e-07 2.918e-07
15-150 9.766e-07 5.205e-07
Plot creation:
Thu Dec 24 13:26:07 EST 2015