batgrbproduct Analysis for Trigger=682339
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): Mon Apr 11 22:24:32 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger682339/GCN5_download_cron
======================================================================
Trigger: 00682339 Segment: 000
BAT Trigger Time: 482030948.032 [s; MET]
Trigger Stop: 482030948.544 [s; MET]
UTC: 2016-04-11T01:28:51.924060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 349.361911484438 Dec: -40.2708134633611 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.44
Image Trigger?: NO
Rate S/N Ratio: 15.9059737205869 [ if not an image trigger ]
Image S/N Ratio: 7.44
Flight Position: [ source = BAT ]
RA: 349.361911484438 Dec: -40.2708134633611 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 349.369995714057 Dec: -40.2584265516404 [deg; J2000]
{ 23h 17m 28.8s , -40d 15' 30.3" }
+/- 2.39418716508463 [arcmin] (estimated 90% radius based on SNR)
+/- 0.939809618545152 [arcmin] (formal 1-sigma fit error)
SNR: 8.73904456147489
Angular difference between Flight and Ground position is 0.830279 arcmin
Partial Coding Fraction: 0.2734375 [ including projection effects ]
Duration
T90: 0.355999946594238 +/- 0.0800000309944188
Measured from: 0.080000102519989
to: 0.436000049114227 [s; relative to TRIGTIME]
T50: 0.195999920368195 +/- 0.0651152861923527
Measured from: 0.156000137329102
to: 0.352000057697296 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.240000009536743
to: 0.759999990463257 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0600000023841858
to: 0.455999970436096 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.016924 0.051139 0.053230 0.012671
0.008633 0.009010 0.009124 0.006808 [error]
Peak 0.030785 0.072385 0.053644 0.016087
0.012125 0.012972 0.012295 0.009379 [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 9.97e-09 1.91e-08 2.83e-08 9.00e-08 7.98e-08 1.47e-07 erg/cm2
Error 3.32e-09 4.38e-09 6.72e-09 4.03e-08 1.75e-08 4.64e-08 erg/cm2
Peak flux Power-law 4.97e-01 4.95e-01 3.46e-01 3.82e-01 1.49e+00 1.72e+00 ph/cm2/s
Error 1.72e-01 1.14e-01 9.22e-02 1.96e-01 3.32e-01 3.79e-01 ph/cm2/s
Fluence Cutoff-PL 5.26e-09 2.41e-08 3.81e-08 1.24e-08 7.79e-08 7.99e-08 erg/cm2
Error 3.71e-09 6.06e-09 1.05e-08 1.83e-08 1.96e-08 2.45e-08 erg/cm2
Peak flux Cutoff-PL 3.23e-01 6.31e-01 3.73e-01 4.08e-02 1.36e+00 1.37e+00 ph/cm2/s
Error 2.79e-01 1.70e-01 1.35e-01 1.30e-01 3.63e-01 3.77e-01 ph/cm2/s
Fluence Band 5.49e-09 2.52e-08 3.53e-08 3.35e-08 8.06e-08 9.87e-08 erg/cm2
Error -------- 6.65e-09 -------- 4.15e-08 -------- 4.33e-08 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 1.432 0.284 - - 2.10e-02 4.46e-03 63.570 57
CPL -1.524 2.745 65.5 17.8 4.93e-01 1.03e+01 53.500 56
The chi2 of BB fit is 53.56 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.518 0.338 - - 1.19e-02 2.65e-03 65.820 57
CPL -1.191 3.508 54.6 33.5 3.18e-01 3.72e+01 61.520 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: 0.384000 sec.
T50 in the 50-300 keV band: 0.256000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.396 0.060 0.456
T90 0.356 0.080 0.436
T50 0.196 0.156 0.352
Peak 1.000 -0.240 0.760
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
349.3700 -40.2584 0.0220 41.9 -133.5 0.1446 8.7 TRIG_00682339
------------------------------------------
Foreground time interval of the image:
0.060 0.456 (delta_t = 0.396 [sec])
Background time interval of the image:
-81.831 0.060 (delta_t = 81.891 [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 0.060 sec. to 0.456 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43239 ( -0.283182 0.285815 )
Norm@50keV : 2.10027E-02 ( -0.00445939 0.0044591 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.57 using 59 PHA bins.
# Reduced chi-squared = 1.115 for 57 degrees of freedom
# Null hypothesis probability = 2.562437e-01
Photon flux (15-150 keV) in 0.396 sec: 2.57752 ( -0.569417 0.572775 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.98443e-08 ( -1.75023e-08 1.75646e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.060 sec. to 0.456 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.52415 ( -3.66907 1.8215 )
Epeak [keV] : 65.5012 ( -12.357 23.3264 )
Norm@50keV : 0.492746 ( -0.492758 20.0242 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.50 using 59 PHA bins.
# Reduced chi-squared = 0.9554 for 56 degrees of freedom
# Null hypothesis probability = 5.700414e-01
Photon flux (15-150 keV) in 0.396 sec: 2.45588 ( -0.59491 0.58945 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.78817e-08 ( -1.97382e-08 1.94262e-08 ) ergs/cm2
Band function
Time interval is from 0.060 sec. to 0.456 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.36804 ( -2.49378 -2.3674 )
beta : -3.11338 ( 3.1134 1.19323 )
Epeak [keV] : 59.9212 ( -14.216 19.6164 )
Norm@50keV : 1.32662 ( -1.33445 14.0816 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.05 using 59 PHA bins.
# Reduced chi-squared = 0.9646 for 55 degrees of freedom
# Null hypothesis probability = 5.494057e-01
Photon flux (15-150 keV) in 0.396 sec: 2.41377 ( 4.58623 -0.57942 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.05591e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.8439 (-2.95579 3.54203)
R^2/D10^2 : 0.237821 (-0.117971 0.223758)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.56 using 59 PHA bins.
# Reduced chi-squared = 0.9396 for 57 degrees of freedom
# Null hypothesis probability = 6.050466e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.455e-09 1.949e-09
25- 50 2.396e-08 7.637e-09
50-150 4.839e-08 1.825e-08
15-150 7.781e-08 2.562e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-90.518 -199.363)
Norm : 11.0798 (-2.31655 2.31696)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.69 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 57 degrees of freedom
# Null hypothesis probability = 3.121999e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.093e-08 6.552e-09
25- 50 2.102e-08 1.208e-08
50-150 4.609e-08 2.715e-08
15-150 7.804e-08 4.592e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 198.850 (-198.852 -198.852)
R1^2/D10^2 : 5.05292E-05 (-5.05274e-05 0.447226)
kT2 [keV] : 16.0319 (-16.0319 3.97469)
R2^2/D10^2 : 0.271631 (-0.0869224 6.60152)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.52 using 59 PHA bins.
#Fit statistic : Chi-Squared = 53.31 using 59 PHA bins.
# Reduced chi-squared = 0.9731 for 55 degrees of freedom
# Reduced chi-squared = 0.9692 for 55 degrees of freedom
# Null hypothesis probability = 5.314075e-01
# Null hypothesis probability = 5.395832e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.622e-09 1.866e-06
25- 50 2.401e-08 1.607e-05
50-150 4.885e-08 3.544e-04
15-150 7.848e-08 3.740e-04
Peak spectrum fit
Power-law model
Time interval is from -0.240 sec. to 0.760 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51828 ( -0.334387 0.342027 )
Norm@50keV : 1.18777E-02 ( -0.00265671 0.0026384 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.82 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 57 degrees of freedom
# Null hypothesis probability = 1.981238e-01
Photon flux (15-150 keV) in 1 sec: 1.49016 ( -0.331026 0.331977 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12359e-07 ( -2.65927e-08 2.69795e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.240 sec. to 0.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.19123 ( -4.65878 2.35714 )
Epeak [keV] : 54.5506 ( -11.0696 55.9162 )
Norm@50keV : 0.318055 ( -0.348716 74.0828 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.52 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 56 degrees of freedom
# Null hypothesis probability = 2.849020e-01
Photon flux (15-150 keV) in 1 sec: 1.36466 ( -0.36458 0.36129 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.3896e-08 ( -2.66813e-08 3.2171e-08 ) ergs/cm2
Band function
Time interval is from -0.240 sec. to 0.760 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.35982 ( -2.38297 -1.55748 )
beta : -2.78153 ( 2.98467 1.32099 )
Epeak [keV] : 52.2986 ( -16.3338 30.6597 )
Norm@50keV : 0.413306 ( -0.608117 34.4101 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.59 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 55 degrees of freedom
# Null hypothesis probability = 2.813477e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00223e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.6905 (-2.53645 3.27916)
R^2/D10^2 : 0.255389 (-0.139188 0.276141)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.56 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 57 degrees of freedom
# Null hypothesis probability = 3.162783e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.013e-08 4.140e-09
25- 50 3.684e-08 1.467e-08
50-150 4.493e-08 2.224e-08
15-150 9.190e-08 2.999e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 195.912 (-110.04 -189.421)
Norm : 6.21563 (-1.35426 1.66853)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.64 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 57 degrees of freedom
# Null hypothesis probability = 2.273486e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.551e-08 8.955e-09
25- 50 2.978e-08 1.712e-08
50-150 6.493e-08 3.680e-08
15-150 1.102e-07 6.385e-08
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.56 using 59 PHA bins.
#Fit statistic : Chi-Squared = 61.50 using 59 PHA bins.
#Fit statistic : Chi-Squared = 60.03 using 59 PHA bins.
#Fit statistic : Chi-Squared = 59.94 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 55 degrees of freedom
# Reduced chi-squared = 1.118 for 55 degrees of freedom
# Reduced chi-squared = 1.092 for 55 degrees of freedom
# Reduced chi-squared = 1.090 for 55 degrees of freedom
# Null hypothesis probability = 2.530052e-01
# Null hypothesis probability = 2.546015e-01
# Null hypothesis probability = 2.983353e-01
# Null hypothesis probability = 3.011530e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Mon Apr 11 22:29:36 EDT 2016