batgrbproduct Analysis for Trigger=663179
Analysis Summary
Special note:
- During this time when the CZT bias voltage is at -150v (not the normal -200v; GCN Circ. 18562),
the energy scale in the plots below and in the data from the Quicklook and HEASARC sites
is somewhat off from the proper calibration.
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 Nov 13 09:59:05 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger663179/GCN5_download_cron
======================================================================
Trigger: 00663179 Segment: 000
BAT Trigger Time: 469028703.488 [s; MET]
Trigger Stop: 469028704 [s; MET]
UTC: 2015-11-12T13:44:48.083580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 2.04524472274834 Dec: -61.6924472596328 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.08
Image Trigger?: NO
Rate S/N Ratio: 12.4899959967968 [ if not an image trigger ]
Image S/N Ratio: 8.08
Flight Position: [ source = BAT ]
RA: 2.04524472274834 Dec: -61.6924472596328 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 2.05320179079845 Dec: -61.6690661019367 [deg; J2000]
{ 00h 08m 12.8s , -61d 40' 08.6" }
+/- 1.94925179378092 [arcmin] (estimated 90% radius based on SNR)
+/- 0.928153766540889 [arcmin] (formal 1-sigma fit error)
SNR: 11.7225290918659
Angular difference between Flight and Ground position is 1.421034 arcmin
Partial Coding Fraction: 0.5234375 [ including projection effects ]
Duration
T90: 58.7520000338554 +/- 24.1810874847648
Measured from: 0.336000144481659
to: 59.0880001783371 [s; relative to TRIGTIME]
T50: 12.0160000324249 +/- 6.30052694836852
Measured from: 3.80800014734268
to: 15.8240001797676 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0119999647140503
to: 0.98800003528595 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0639999508857727
to: 69.0080000162125 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.539976 0.564794 0.372516 0.148563
0.060902 0.062609 0.054609 0.048440 [error]
Peak 0.059291 0.080601 0.058293 0.009522
0.008348 0.008948 0.007767 0.006095 [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 1.86e-07 2.71e-07 2.94e-07 5.97e-07 9.35e-07 1.35e-06 erg/cm2
Error 3.29e-08 3.08e-08 5.59e-08 2.34e-07 1.27e-07 2.87e-07 erg/cm2
Peak flux Power-law 6.81e-01 6.20e-01 3.89e-01 3.73e-01 1.85e+00 2.06e+00 ph/cm2/s
Error 1.32e-01 7.72e-02 6.37e-02 1.20e-01 2.27e-01 2.51e-01 ph/cm2/s
Fluence Cutoff-PL 1.87e-07 2.71e-07 2.92e-07 5.80e-07 9.31e-07 1.33e-06 erg/cm2
Error 3.35e-08 3.12e-08 5.60e-08 3.72e-07 1.28e-07 2.43e-07 erg/cm2
Peak flux Cutoff-PL 6.00e-01 6.65e-01 4.16e-01 1.86e-01 1.80e+00 1.87e+00 ph/cm2/s
Error 1.63e-01 9.63e-02 7.49e-02 1.80e-01 2.33e-01 2.99e-01 ph/cm2/s
Fluence Band 5.35e-07 9.75e-07 9.48e-07 1.58e-06 3.00e-06 4.04e-06 erg/cm2
Error -------- -------- 1.36e-07 -------- -------- -------- erg/cm2
Peak flux Band 6.02e-01 6.63e-01 4.16e-01 1.94e-01 1.80e+00 1.88e+00 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 1.881 0.224 - - 1.47e-03 2.01e-04 62.100 57
CPL 2.179 0.501 73.2 0.0 1.03e-03 0.00e+00 61.810 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.671 0.206 - - 1.40e-02 1.81e-03 57.500 57
CPL 0.946 0.939 72.9 -27.3 3.28e-02 4.83e-02 55.520 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: 10.240000 sec.
T50 in the 50-300 keV band: 5.440000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 69.072 -0.064 69.008
T90 58.752 0.336 59.088
T50 12.016 3.808 15.824
Peak 1.000 -0.012 0.988
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
2.0532 -61.6691 0.0164 36.0 -38.2 1.6138 11.7 TRIG_00663179
------------------------------------------
Foreground time interval of the image:
-0.064 69.008 (delta_t = 69.072 [sec])
Background time interval of the image:
-239.488 -0.064 (delta_t = 239.424 [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 -0.064 sec. to 69.008 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88114 ( -0.217799 0.230261 )
Norm@50keV : 1.47233E-03 ( -0.000203837 0.000197592 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.10 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 57 degrees of freedom
# Null hypothesis probability = 2.993521e-01
Photon flux (15-150 keV) in 69.07 sec: 0.209624 ( -0.0241287 0.024169 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.34869e-07 ( -1.26006e-07 1.28147e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.064 sec. to 69.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.17906 ( -0.915773 0.0871656 )
Epeak [keV] : 73.1886 ( )
Norm@50keV : 1.03118E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.81 using 59 PHA bins.
# Reduced chi-squared = 1.104 for 56 degrees of freedom
# Null hypothesis probability = 2.763563e-01
Photon flux (15-150 keV) in 69.07 sec: 0.209763 ( -0.024353 0.023986 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.30932e-07 ( -1.25493e-07 1.30287e-07 ) ergs/cm2
Band function
Time interval is from -0.064 sec. to 69.008 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.54398 ( 1.54425 1.54425 )
beta : -1.88110 ( 1.88112 0.217644 )
Epeak [keV] : 15.7466 ( -15.6129 -15.6129 )
Norm@50keV : 3.37143E-03 ( -0.00208807 1.36771 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.10 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 55 degrees of freedom
# Null hypothesis probability = 2.379480e-01
Photon flux (15-150 keV) in 69.07 sec: 0.675729 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99759e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.3207 (-1.7077 2.0204)
R^2/D10^2 : 5.95446E-02 (-0.0270682 0.0501926)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.55 using 59 PHA bins.
# Reduced chi-squared = 1.554 for 57 degrees of freedom
# Null hypothesis probability = 4.688674e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.107e-07 2.359e-08
25- 50 3.246e-07 5.608e-08
50-150 2.401e-07 6.544e-08
15-150 6.755e-07 1.117e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 92.4444 (-31.8578 67.3157)
Norm : 0.932146 (-0.149251 0.192711)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.36 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 57 degrees of freedom
# Null hypothesis probability = 2.347919e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.681e-07 2.739e-08
25- 50 2.860e-07 3.792e-08
50-150 4.426e-07 1.963e-07
15-150 8.967e-07 2.110e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.76407 (-1.87818 2.36302)
R1^2/D10^2 : 1.15983 (-0.898723 11.9918)
kT2 [keV] : 19.8088 (-5.37869 12.968)
R2^2/D10^2 : 6.04218E-03 (-0.00502762 0.0148418)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.26 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 55 degrees of freedom
# Null hypothesis probability = 1.839301e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.916e-07 9.881e-08
25- 50 2.494e-07 1.038e-07
50-150 4.585e-07 2.597e-07
15-150 8.995e-07 4.246e-07
Peak spectrum fit
Power-law model
Time interval is from -0.012 sec. to 0.988 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67141 ( -0.201995 0.20983 )
Norm@50keV : 1.40425E-02 ( -0.00182429 0.00179993 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.50 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 57 degrees of freedom
# Null hypothesis probability = 4.566745e-01
Photon flux (15-150 keV) in 1 sec: 1.84676 ( -0.226832 0.227097 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30333e-07 ( -1.77085e-08 1.78728e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.012 sec. to 0.988 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.945876 ( -1.06896 0.809765 )
Epeak [keV] : 72.9199 ( -18.3868 -72.9156 )
Norm@50keV : 3.27811E-02 ( -0.0196714 0.0770275 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.52 using 59 PHA bins.
# Reduced chi-squared = 0.9914 for 56 degrees of freedom
# Null hypothesis probability = 4.930477e-01
Photon flux (15-150 keV) in 1 sec: 1.79975 ( -0.23134 0.23463 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25809e-07 ( -1.8479e-08 1.8757e-08 ) ergs/cm2
Band function
Time interval is from -0.012 sec. to 0.988 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.989431 ( -0.58648 0.969321 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 74.9717 ( -21.0549 -74.9077 )
Norm@50keV : 3.10322E-02 ( -0.0171646 0.0153336 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.53 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 55 degrees of freedom
# Null hypothesis probability = 4.547634e-01
Photon flux (15-150 keV) in 1 sec: 1.80315 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25859e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.3531 (-1.80096 2.0638)
R^2/D10^2 : 0.246617 (-0.0953862 0.152786)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.69 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 57 degrees of freedom
# Null hypothesis probability = 2.010904e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.070e-08 2.453e-09
25- 50 4.079e-08 6.795e-09
50-150 5.603e-08 1.355e-08
15-150 1.075e-07 1.765e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 140.345 (-52.2632 -140.875)
Norm : 7.76000 (-1.06265 1.24247)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.94 using 59 PHA bins.
# Reduced chi-squared = 0.9815 for 57 degrees of freedom
# Null hypothesis probability = 5.147423e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.004e-08 3.705e-09
25- 50 3.677e-08 1.416e-08
50-150 7.056e-08 3.978e-08
15-150 1.274e-07 4.926e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.80523 (-1.09 1.7291)
R1^2/D10^2 : 101.569 (-93.6746 3298.13)
kT2 [keV] : 16.5516 (-2.36406 3.09246)
R2^2/D10^2 : 0.136638 (-0.0656502 0.104892)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.02 using 59 PHA bins.
# Reduced chi-squared = 0.9277 for 55 degrees of freedom
# Null hypothesis probability = 6.273726e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.004e-08 8.335e-09
25- 50 3.466e-08 8.380e-09
50-150 6.444e-08 1.886e-08
15-150 1.191e-07 2.704e-08
Plot creation:
Fri Nov 13 10:13:32 EST 2015