batgrbproduct Analysis for Trigger=668689
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): Wed Dec 30 02:40:49 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger668689/GCN5_download_cron
======================================================================
Trigger: 00668689 Segment: 000
BAT Trigger Time: 473064643.584 [s; MET]
Trigger Stop: 473064644.096 [s; MET]
UTC: 2015-12-29T06:50:27.963280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 329.379608251525 Dec: -20.7287933382282 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 17.29
Image Trigger?: NO
Rate S/N Ratio: 61.3595958265698 [ if not an image trigger ]
Image S/N Ratio: 17.29
Flight Position: [ source = BAT ]
RA: 329.379608251525 Dec: -20.7287933382282 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 329.363964998969 Dec: -20.7319954618356 [deg; J2000]
{ 21h 57m 27.4s , -20d 43' 55.2" }
+/- 1.03163883193719 [arcmin] (estimated 90% radius based on SNR)
+/- 0.35599340346105 [arcmin] (formal 1-sigma fit error)
SNR: 29.0933091143668
Angular difference between Flight and Ground position is 0.898606 arcmin
Partial Coding Fraction: 0.515625 [ including projection effects ]
Duration
T90: 1.43999993801117 +/- 0.447146548280103
Measured from: -0.0519998669624329
to: 1.38800007104874 [s; relative to TRIGTIME]
T50: 0.607999980449677 +/- 0.0804984237327102
Measured from: 0.140000104904175
to: 0.748000085353851 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.111999988555908
to: 0.888000011444092 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.111999988555908
to: 2.34399998188019 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.317170 0.398969 0.240220 0.044815
0.017669 0.018920 0.015939 0.011435 [error]
Peak 0.248888 0.319964 0.208348 0.039736
0.013449 0.014743 0.012564 0.008356 [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 1.12e-07 1.67e-07 1.87e-07 3.94e-07 5.86e-07 8.60e-07 erg/cm2
Error 1.01e-08 9.58e-09 1.56e-08 6.79e-08 3.68e-08 8.22e-08 erg/cm2
Peak flux Power-law 2.76e+00 2.41e+00 1.44e+00 1.31e+00 7.17e+00 7.92e+00 ph/cm2/s
Error 2.47e-01 1.35e-01 1.06e-01 1.90e-01 4.00e-01 4.25e-01 ph/cm2/s
Fluence Cutoff-PL 1.06e-07 1.75e-07 1.90e-07 2.16e-07 5.69e-07 6.87e-07 erg/cm2
Error 1.18e-08 1.21e-08 1.68e-08 1.31e-07 4.06e-08 1.37e-07 erg/cm2
Peak flux Cutoff-PL 2.62e+00 2.48e+00 1.48e+00 9.31e-01 7.07e+00 7.51e+00 ph/cm2/s
Error 2.92e-01 1.60e-01 1.16e-01 3.82e-01 4.14e-01 5.73e-01 ph/cm2/s
Fluence Band 1.04e-07 1.76e-07 1.85e-07 3.07e-07 5.70e-07 7.74e-07 erg/cm2
Error 1.25e-08 -------- 1.91e-08 -------- -------- -------- erg/cm2
Peak flux Band 2.58e+00 2.52e+00 1.44e+00 1.13e+00 7.05e+00 7.67e+00 ph/cm2/s
Error -------- -------- -------- -------- 4.18e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.843 0.102 - - 2.59e-02 1.61e-03 48.270 57
CPL 1.442 0.413 66.0 170.2 4.22e-02 2.21e-02 45.220 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.738 0.095 - - 5.33e-02 3.04e-03 60.350 57
CPL 1.442 0.359 92.7 -32.1 7.57e-02 3.30e-02 58.280 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: 0.960000 sec.
T50 in the 50-300 keV band: 0.448000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 2.456 -0.112 2.344
T90 1.440 -0.052 1.388
T50 0.608 0.140 0.748
Peak 1.000 -0.112 0.888
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
329.3640 -20.7320 0.0066 32.4 -125.2 1.0132 29.1 TRIG_00668689
------------------------------------------
Foreground time interval of the image:
-0.112 2.344 (delta_t = 2.456 [sec])
Background time interval of the image:
-239.584 -0.112 (delta_t = 239.472 [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 -0.112 sec. to 2.344 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84285 ( -0.101243 0.103246 )
Norm@50keV : 2.59249E-02 ( -0.00161828 0.00160487 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.27 using 59 PHA bins.
# Reduced chi-squared = 0.8469 for 57 degrees of freedom
# Null hypothesis probability = 7.881848e-01
Photon flux (15-150 keV) in 2.456 sec: 3.63355 ( -0.212604 0.212784 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.85513e-07 ( -3.67108e-08 3.69004e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.112 sec. to 2.344 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44214 ( -0.433353 0.392542 )
Epeak [keV] : 66.0048 ( -15.0941 325.247 )
Norm@50keV : 4.21647E-02 ( -0.0156273 0.0285127 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.22 using 59 PHA bins.
# Reduced chi-squared = 0.8074 for 56 degrees of freedom
# Null hypothesis probability = 8.481799e-01
Photon flux (15-150 keV) in 2.456 sec: 3.56503 ( -0.22248 0.22253 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.68589e-07 ( -4.05977e-08 4.05633e-08 ) ergs/cm2
Band function
Time interval is from -0.112 sec. to 2.344 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25525 ( -0.297083 1.41264 )
beta : -2.08041 ( 2.09199 0.277669 )
Epeak [keV] : 53.1969 ( -32.8273 277.671 )
Norm@50keV : 5.54944E-02 ( -0.0216631 3629.44 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.15 using 59 PHA bins.
# Reduced chi-squared = 0.8209 for 55 degrees of freedom
# Null hypothesis probability = 8.257383e-01
Photon flux (15-150 keV) in 2.456 sec: 3.56229 ( 3.43771 -0.22299 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.69569e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.0413 ( )
R^2/D10^2 : 0.841140 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 116.01 using 59 PHA bins.
# Reduced chi-squared = 2.0353 for 57 degrees of freedom
# Null hypothesis probability = 6.501269e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.337e-08 6.324e-09
25- 50 2.002e-07 1.350e-08
50-150 1.750e-07 2.348e-08
15-150 4.386e-07 3.107e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 97.2940 (-17.9772 25.2197)
Norm : 16.0581 (-1.31671 1.47016)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.52 using 59 PHA bins.
# Reduced chi-squared = 0.7986 for 57 degrees of freedom
# Null hypothesis probability = 8.629421e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.031e-07 1.023e-08
25- 50 1.772e-07 1.063e-08
50-150 2.827e-07 8.431e-08
15-150 5.630e-07 8.829e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.35345 (-1.1908 1.29224)
R1^2/D10^2 : 6.12441 (-2.84166 6.94258)
kT2 [keV] : 21.7689 (-3.70372 5.97863)
R2^2/D10^2 : 6.78430E-02 (-0.0416298 0.0778253)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.51 using 59 PHA bins.
# Reduced chi-squared = 0.8639 for 55 degrees of freedom
# Null hypothesis probability = 7.532104e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.019e-07 2.138e-08
25- 50 1.754e-07 2.995e-08
50-150 2.844e-07 8.887e-08
15-150 5.617e-07 9.529e-08
Peak spectrum fit
Power-law model
Time interval is from -0.112 sec. to 0.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73797 ( -0.0942793 0.0956875 )
Norm@50keV : 5.32565E-02 ( -0.00304897 0.00303154 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.35 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 57 degrees of freedom
# Null hypothesis probability = 3.556279e-01
Photon flux (15-150 keV) in 1 sec: 7.16950 ( -0.399233 0.399779 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.91772e-07 ( -2.91269e-08 2.92439e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.112 sec. to 0.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44193 ( -0.383126 0.334444 )
Epeak [keV] : 92.6700 ( -28.3909 -92.6701 )
Norm@50keV : 7.56516E-02 ( -0.0238128 0.0422705 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.28 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 56 degrees of freedom
# Null hypothesis probability = 3.913226e-01
Photon flux (15-150 keV) in 1 sec: 7.07467 ( -0.4142 0.41432 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.82497e-07 ( -3.1635e-08 3.1425e-08 ) ergs/cm2
Band function
Time interval is from -0.112 sec. to 0.888 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.95988 ( -8.36336 -4.95988 )
beta : -1.79183 ( -0.107318 0.103778 )
Epeak [keV] : 22.2222 ( -7.89744 3.31546 )
Norm@50keV : 1.34630E+04 ( -721.178 117568 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.43 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 55 degrees of freedom
# Null hypothesis probability = 3.853397e-01
Photon flux (15-150 keV) in 1 sec: 7.05450 ( -0.0545 -0.41818 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.82327e-07 ( -4.8232e-07 -3.1112e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.0186 ( )
R^2/D10^2 : 1.27132 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 145.15 using 59 PHA bins.
# Reduced chi-squared = 2.5464 for 57 degrees of freedom
# Null hypothesis probability = 1.247447e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.570e-08 4.495e-09
25- 50 1.576e-07 1.050e-08
50-150 1.690e-07 1.970e-08
15-150 3.724e-07 2.470e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 129.664 (-27.9838 34.6857)
Norm : 29.7998 (-1.99002 2.49111)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.82 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 57 degrees of freedom
# Null hypothesis probability = 4.086974e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.733e-08 6.535e-09
25- 50 1.402e-07 1.065e-08
50-150 2.596e-07 7.375e-08
15-150 4.770e-07 8.940e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.47107 (-1.09221 1.24673)
R1^2/D10^2 : 11.0438 (-4.98712 10.6759)
kT2 [keV] : 23.6243 (-3.69241 5.77149)
R2^2/D10^2 : 0.109564 (-0.0618156 0.104158)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.27 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 55 degrees of freedom
# Null hypothesis probability = 2.909654e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.890e-08 1.569e-08
25- 50 1.398e-07 2.095e-08
50-150 2.606e-07 5.480e-08
15-150 4.792e-07 8.055e-08
Plot creation:
Wed Dec 30 02:47:28 EST 2015