batgrbproduct Analysis for Trigger=666827
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 10 02:15:42 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger666827/GCN5_download_cron
======================================================================
Trigger: 00666827 Segment: 000
BAT Trigger Time: 471334128 [s; MET]
Trigger Stop: 471334976 [s; MET]
UTC: 2015-12-09T06:08:32.472220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 282.088497848896 Dec: -2.42140587685968 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.73
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.73
Flight Position: [ source = BAT ]
RA: 282.088497848896 Dec: -2.42140587685968 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 282.097936950162 Dec: -2.41288387382138 [deg; J2000]
{ 18h 48m 23.5s , -02d 24' 46.4" }
+/- 3.90232214312177 [arcmin] (estimated 90% radius based on SNR)
+/- 2.49962974653156 [arcmin] (formal 1-sigma fit error)
SNR: 4.34881635334345
Angular difference between Flight and Ground position is 0.762644 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 888.511999964714 +/- 150.334654442426
Measured from: -64.8799998760223
to: 823.632000088692 [s; relative to TRIGTIME]
T50: 488.079999923706 +/- 143.0984847867
Measured from: 138.572000145912
to: 626.652000069618 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 518.939999997616
to: 519.939999997616 [s; relative to TRIGTIME]
Total Fluence
Measured from: -89.0040000081062
to: 875.360000014305 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.659139 1.346711 0.443802 -0.422208
0.209362 0.209792 0.180598 0.155785 [error]
Peak 0.014521 0.010437 0.011382 0.009629
0.006865 0.006774 0.005870 0.005085 [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 4.50e-07 5.28e-07 4.47e-07 6.40e-07 1.65e-06 2.06e-06 erg/cm2
Error 9.10e-08 9.65e-08 1.50e-07 4.03e-07 3.56e-07 6.12e-07 erg/cm2
Peak flux Power-law 9.87e-02 1.04e-01 7.69e-02 9.22e-02 3.15e-01 3.71e-01 ph/cm2/s
Error 1.04e-01 7.91e-02 6.40e-02 7.50e-01 2.05e-01 6.77e-01 ph/cm2/s
Fluence Cutoff-PL 4.31e-07 6.40e-07 2.94e-07 2.68e-08 1.39e-06 1.39e-06 erg/cm2
Error 9.95e-08 1.39e-07 2.17e-07 1.85e-07 3.50e-07 4.04e-07 erg/cm2
Peak flux Cutoff-PL 1.04e-01 1.05e-01 7.43e-02 8.28e-02 3.16e-01 3.67e-01 ph/cm2/s
Error 9.95e-02 7.90e-02 6.38e-02 3.89e-01 1.55e-01 -------- ph/cm2/s
Fluence Band 4.29e-07 6.33e-07 3.10e-07 1.89e-07 1.47e-06 1.57e-06 erg/cm2
Error 1.15e-07 -------- -------- -------- -------- -------- 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 2.241 0.322 - - 1.81e-04 4.53e-05 68.620 57
CPL 0.326 2.364 30.0 0.0 3.16e-03 0.00e+00 64.410 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.437 1.390 - - 2.56e-03 1.41e-03 61.070 57
CPL 1.568 0.000 9999.4 0.0 2.44e-03 0.00e+00 61.120 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 964.364 -89.004 875.360
T90 888.512 -64.880 823.632
T50 488.080 138.572 626.652
Peak 1.000 518.940 519.940
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
282.0979 -2.4129 0.0443 17.8 -91.7 3.1229 4.3 TRIG_00666827
------------------------------------------
Foreground time interval of the image:
-14.699 852.601 (delta_t = 867.300 [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 -89.004 sec. to 875.360 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.24139 ( -0.303697 0.340517 )
Norm@50keV : 1.81161E-04 ( -4.55404e-05 4.5061e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.62 using 59 PHA bins.
# Reduced chi-squared = 1.204 for 57 degrees of freedom
# Null hypothesis probability = 1.393477e-01
Photon flux (15-150 keV) in 964.4 sec: 3.06596E-02 ( -0.00513286 0.00513618 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65279e-06 ( -3.46574e-07 3.654e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -89.004 sec. to 875.360 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.325531 ( -3.04686 1.68063 )
Epeak [keV] : 30.0267 ( )
Norm@50keV : 3.15847E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.41 using 59 PHA bins.
# Reduced chi-squared = 1.150 for 56 degrees of freedom
# Null hypothesis probability = 2.060418e-01
Photon flux (15-150 keV) in 964.4 sec: 2.95663E-02 ( -0.0050587 0.0051159 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3897e-06 ( -3.09293e-07 3.90447e-07 ) ergs/cm2
Band function
Time interval is from -89.004 sec. to 875.360 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.86727 ( -6.5733 -4.86727 )
beta : -2.78126 ( -0.812077 0.515936 )
Epeak [keV] : 24.4415 ( -4.84629 4.09637 )
Norm@50keV : 37.0249 ( -6.01508 162.666 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.50 using 59 PHA bins.
# Reduced chi-squared = 1.154 for 55 degrees of freedom
# Null hypothesis probability = 2.019712e-01
Photon flux (15-150 keV) in 964.4 sec: 2.97880E-02 ( 6.97021 -0.0050733 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47052e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.75004 (-1.22454 1.46808)
R^2/D10^2 : 4.01046E-02 (-0.0201433 0.0397559)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.82 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 57 degrees of freedom
# Null hypothesis probability = 1.980998e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.099e-07 1.303e-07
25- 50 6.784e-07 1.866e-07
50-150 1.603e-07 8.215e-08
15-150 1.249e-06 3.446e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 40.2949 (-13.4081 24.3312)
Norm : 0.201294 (-0.0521157 0.0763259)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.25 using 59 PHA bins.
# Reduced chi-squared = 1.145 for 57 degrees of freedom
# Null hypothesis probability = 2.117783e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.469e-07 9.716e-08
25- 50 5.898e-07 1.455e-07
50-150 4.600e-07 2.398e-07
15-150 1.497e-06 4.554e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 14.9893 (-16.6518 -16.6518)
R1^2/D10^2 : 1.19216E-03 (-0.000704706 0.0521532)
kT2 [keV] : 6.07538 (-6.30102 -6.30102)
R2^2/D10^2 : 7.95844E-02 (-0.0453365 0.532545)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.72 using 59 PHA bins.
#Fit statistic : Chi-Squared = 63.65 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 55 degrees of freedom
# Reduced chi-squared = 1.157 for 55 degrees of freedom
# Null hypothesis probability = 1.964834e-01
# Null hypothesis probability = 1.981481e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.356e-07 2.659e-07
25- 50 6.032e-07 3.368e-07
50-150 3.535e-07 2.419e-07
15-150 1.392e-06 8.086e-07
Peak spectrum fit
Power-law model
Time interval is from 518.940 sec. to 519.940 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43737 ( -1.43329 1.34758 )
Norm@50keV : 2.56297E-03 ( -0.00155624 0.00127254 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.07 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 57 degrees of freedom
# Null hypothesis probability = 3.319408e-01
Photon flux (15-150 keV) in 1 sec: 0.314634 ( -0.252383 0.157055 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.46315e-08 ( -2.46315e-08 1.55113e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 518.940 sec. to 519.940 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56785 ( )
Epeak [keV] : 9999.36 ( )
Norm@50keV : 2.43515E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.12 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 56 degrees of freedom
# Null hypothesis probability = 2.972367e-01
Photon flux (15-150 keV) in 1 sec: 0.316484 ( -0.154448 0.155141 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33153e-08 ( -1.3168e-08 1.69497e-08 ) ergs/cm2
Band function
Time interval is from 518.940 sec. to 519.940 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.10992 ( 1.12502 1.12502 )
beta : -1.42050 ( 1.42633 1.42633 )
Epeak [keV] : 46.2233 ( -43.3624 -43.3624 )
Norm@50keV : 4.98389E-03 ( -0.00501626 0.516518 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.07 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 55 degrees of freedom
# Null hypothesis probability = 2.670532e-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] : 7.12491 (-3.06335 -7.12491)
R^2/D10^2 : 0.508099 (-0.508099 4.60597)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.67 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 57 degrees of freedom
# Null hypothesis probability = 2.532900e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.219e-09 2.852e-09
25- 50 5.978e-09 4.264e-09
50-150 1.056e-09 1.215e-09
15-150 1.125e-08 7.715e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 1.26300 (-0.626452 0.626478)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.65 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 57 degrees of freedom
# Null hypothesis probability = 3.133725e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.145e-09 2.138e-09
25- 50 6.050e-09 4.055e-09
50-150 1.327e-08 8.980e-09
15-150 2.246e-08 1.563e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.03058 (-2.7194 3.74823)
R1^2/D10^2 : 0.885293 (-0.810249 7.2459)
kT2 [keV] : 199.363 (-199.363 -199.363)
R2^2/D10^2 : 8.21550E-05 (-5.18598e-05 0.00207929)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.86 using 59 PHA bins.
# Reduced chi-squared = 1.034 for 55 degrees of freedom
# Null hypothesis probability = 4.056806e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.414e-09 2.747e-09
25- 50 5.238e-09 3.374e-09
50-150 2.216e-08 6.465e-09
15-150 3.181e-08 1.322e-08
Plot creation:
Thu Dec 10 02:21:47 EST 2015