batgrbproduct Analysis for Trigger=662086
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 Oct 30 05:21:50 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger662086/GCN5_download_cron
======================================================================
Trigger: 00662086 Segment: 000
BAT Trigger Time: 467797794.304 [s; MET]
Trigger Stop: 467797795.328 [s; MET]
UTC: 2015-10-29T07:49:38.965120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 38.5287531705669 Dec: -35.3541474622592 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.6
Image Trigger?: NO
Rate S/N Ratio: 20.2731349327133 [ if not an image trigger ]
Image S/N Ratio: 10.6
Flight Position: [ source = BAT ]
RA: 38.5287531705669 Dec: -35.3541474622592 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 38.5267202138619 Dec: -35.3884636695281 [deg; J2000]
{ 02h 34m 06.4s , -35d 23' 18.5" }
+/- 2.76150727191024 [arcmin] (estimated 90% radius based on SNR)
+/- 1.48955725960383 [arcmin] (formal 1-sigma fit error)
SNR: 7.12704556604534
Angular difference between Flight and Ground position is 2.061373 arcmin
Partial Coding Fraction: 0.4101562 [ including projection effects ]
Duration
T90: 82.4519999623299 +/- 80.3451669908966
Measured from: -79.691999912262
to: 2.7600000500679 [s; relative to TRIGTIME]
T50: 3.64399993419647 +/- 159.204380742931
Measured from: 0.224000096321106
to: 3.86800003051758 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.15200001001358
to: 0.84799998998642 [s; relative to TRIGTIME]
Total Fluence
Measured from: -158.804000020027
to: 11.4599999785423 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.601253 0.461985 0.023692 0.074241
0.098792 0.102085 0.090359 0.080225 [error]
Peak 0.071756 0.093650 0.037788 0.004572
0.009567 0.010540 0.008429 0.006521 [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 1.87e-07 1.82e-07 1.23e-07 1.31e-07 5.45e-07 6.24e-07 erg/cm2
Error 4.80e-08 5.16e-08 6.75e-08 1.56e-07 1.67e-07 2.46e-07 erg/cm2
Peak flux Power-law 8.03e-01 6.15e-01 3.15e-01 2.32e-01 1.84e+00 1.96e+00 ph/cm2/s
Error 1.49e-01 8.45e-02 6.80e-02 9.23e-02 2.53e-01 2.73e-01 ph/cm2/s
Fluence Cutoff-PL 1.92e-07 2.13e-07 2.58e-08 8.72e-11 4.31e-07 4.31e-07 erg/cm2
Error 5.47e-08 8.28e-08 6.80e-08 3.10e-08 1.42e-07 1.45e-07 erg/cm2
Peak flux Cutoff-PL 7.37e-01 7.30e-01 2.93e-01 4.14e-02 1.80e+00 1.80e+00 ph/cm2/s
Error 1.66e-01 1.30e-01 6.95e-02 8.50e-02 2.55e-01 2.61e-01 ph/cm2/s
Fluence Band 1.96e-07 2.01e-07 5.99e-08 2.22e-08 4.73e-07 4.84e-07 erg/cm2
Error 5.37e-08 6.79e-08 -------- -------- -------- -------- erg/cm2
Peak flux Band 7.28e-01 6.31e-01 2.78e-01 7.26e-02 1.69e+00 1.71e+00 ph/cm2/s
Error 1.66e-01 -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.559 0.501 - - 3.17e-04 1.30e-04 59.580 57
CPL -1.616 0.922 24.6 15.6 3.04e-01 6.23e+05 56.050 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.965 0.232 - - 1.25e-02 2.09e-03 79.980 57
CPL 0.572 1.394 40.2 14.1 8.67e-02 4.52e-01 75.630 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 170.264 -158.804 11.460
T90 82.452 -79.692 2.760
T50 3.644 0.224 3.868
Peak 1.000 -0.152 0.848
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
38.5267 -35.3885 0.0270 32.0 49.2 0.9352 7.1 TRIG_00662086
------------------------------------------
Foreground time interval of the image:
-54.103 11.460 (delta_t = 65.563 [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
Multiple GTIs in the spectrum
tstart tstop
-158.804000 -56.525800
-55.304000 11.460000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.55942 ( -0.452779 0.549972 )
Norm@50keV : 3.17173E-04 ( -0.000127507 0.000133075 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.58 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 57 degrees of freedom
# Null hypothesis probability = 3.819726e-01
Photon flux (15-150 keV) in 169 sec: 6.46443E-02 ( -0.0149298 0.0149824 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.44995e-07 ( -1.58467e-07 1.74841e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-158.804000 -56.525800
-55.304000 11.460000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.61563 ( 0.488929 2.33204 )
Epeak [keV] : 24.5670 ( -23.922 7.29695 )
Norm@50keV : 0.303524 ( -0.300732 1.24597e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.05 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 56 degrees of freedom
# Null hypothesis probability = 4.729247e-01
Photon flux (15-150 keV) in 169 sec: 6.20146E-02 ( -0.0146191 0.0145043 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.30563e-07 ( -1.25528e-07 1.58238e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-158.804000 -56.525800
-55.304000 11.460000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97106 ( -14.8177 -4.97106 )
beta : -3.76350 ( 3.7635 1.11865 )
Epeak [keV] : 23.7254 ( -4.8065 4.01508 )
Norm@50keV : 130.953 ( -28.5141 500.777 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.80 using 59 PHA bins.
# Reduced chi-squared = 0.9964 for 55 degrees of freedom
# Null hypothesis probability = 4.822577e-01
Photon flux (15-150 keV) in 169 sec: 0.675804 ( 6.3242 -0.070984 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.72614e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.29651 (-1.25726 1.58244)
R^2/D10^2 : 0.201678 (-0.123458 0.32096)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.10 using 59 PHA bins.
# Reduced chi-squared = 0.9843 for 57 degrees of freedom
# Null hypothesis probability = 5.086561e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.918e-07 1.023e-07
25- 50 2.121e-07 1.021e-07
50-150 2.357e-08 1.784e-08
15-150 4.275e-07 2.223e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 25.7045 (-9.90151 19.2083)
Norm : 0.609228 (-0.236567 0.434798)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.33 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 57 degrees of freedom
# Null hypothesis probability = 4.629078e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.919e-07 6.605e-08
25- 50 2.002e-07 9.518e-08
50-150 8.865e-08 6.887e-08
15-150 4.808e-07 2.040e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.68923 (-5.69563 2.06798)
R1^2/D10^2 : 0.270171 (-0.267873 -0.267873)
kT2 [keV] : 13.1453 (-13.2959 -13.2959)
R2^2/D10^2 : 2.16090E-03 (-0.00199582 0.489304)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.77 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 55 degrees of freedom
# Null hypothesis probability = 4.455317e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.946e-07 1.382e-07
25- 50 2.072e-07 1.629e-07
50-150 6.304e-08 4.600e-08
15-150 4.648e-07 3.499e-07
Peak spectrum fit
Power-law model
Time interval is from -0.152 sec. to 0.848 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96532 ( -0.224507 0.239367 )
Norm@50keV : 1.24593E-02 ( -0.00211805 0.00207087 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.98 using 59 PHA bins.
# Reduced chi-squared = 1.403 for 57 degrees of freedom
# Null hypothesis probability = 2.402125e-02
Photon flux (15-150 keV) in 1 sec: 1.83972 ( -0.252561 0.252583 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14725e-07 ( -1.85033e-08 1.88882e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.152 sec. to 0.848 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.572378 ( -1.62429 1.1645 )
Epeak [keV] : 40.1875 ( -9.29095 18.9828 )
Norm@50keV : 8.67217E-02 ( -0.086829 0.816305 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.63 using 59 PHA bins.
# Reduced chi-squared = 1.350 for 56 degrees of freedom
# Null hypothesis probability = 4.137931e-02
Photon flux (15-150 keV) in 1 sec: 1.79514 ( -0.2542 0.25492 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01712e-07 ( -1.89217e-08 2.1209e-08 ) ergs/cm2
Band function
Time interval is from -0.152 sec. to 0.848 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.89156 ( -5.16222 -3.89144 )
beta : -2.38328 ( -0.652152 0.404755 )
Epeak [keV] : 27.1099 ( -6.28114 14.7504 )
Norm@50keV : 211.227 ( -211.252 408.639 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.72 using 59 PHA bins.
# Reduced chi-squared = 1.340 for 55 degrees of freedom
# Null hypothesis probability = 4.676921e-02
Photon flux (15-150 keV) in 1 sec: 1.69083 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08741e-07 ( -1.08734e-07 -1.89865e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.53862 (-1.31377 1.52895)
R^2/D10^2 : 1.09285 (-0.479125 0.836866)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.17 using 59 PHA bins.
# Reduced chi-squared = 1.406 for 57 degrees of freedom
# Null hypothesis probability = 2.323508e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.989e-08 4.540e-09
25- 50 4.619e-08 8.550e-09
50-150 2.099e-08 7.530e-09
15-150 8.707e-08 1.619e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 64.6797 (-20.5665 37.3226)
Norm : 9.54502 (-1.8806 2.28129)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.54 using 59 PHA bins.
# Reduced chi-squared = 1.343 for 57 degrees of freedom
# Null hypothesis probability = 4.307612e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.426e-08 4.230e-09
25- 50 3.775e-08 6.245e-09
50-150 4.565e-08 1.747e-08
15-150 1.077e-07 2.072e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.44573 (-3.07926 2.35218)
R1^2/D10^2 : 2.27202 (-1.33195 7.72523)
kT2 [keV] : 24.0888 (-19.7951 -24.1646)
R2^2/D10^2 : 1.49400E-02 (-0.0144025 0.0531678)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.11 using 59 PHA bins.
# Reduced chi-squared = 1.347 for 55 degrees of freedom
# Null hypothesis probability = 4.388054e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.301e-08 1.059e-08
25- 50 4.160e-08 2.026e-08
50-150 4.374e-08 2.749e-08
15-150 1.084e-07 5.233e-08
Plot creation:
Fri Oct 30 05:28:30 EDT 2015