batgrbproduct Analysis for Trigger=683076
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 18 10:42:46 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger683076/GCN5_download_cron
======================================================================
Trigger: 00683076 Segment: 000
BAT Trigger Time: 482559837.184 [s; MET]
Trigger Stop: 482559841.28 [s; MET]
UTC: 2016-04-17T04:23:41.047080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 120.239601231894 Dec: 7.67083182618275 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.19
Image Trigger?: NO
Rate S/N Ratio: 12.2065556157337 [ if not an image trigger ]
Image S/N Ratio: 7.19
Flight Position: [ source = BAT ]
RA: 120.239601231894 Dec: 7.67083182618275 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 120.260472029128 Dec: 7.64722633561789 [deg; J2000]
{ 08h 01m 02.5s , +07d 38' 50.0" }
+/- 1.868496992549 [arcmin] (estimated 90% radius based on SNR)
+/- 0.933467922792542 [arcmin] (formal 1-sigma fit error)
SNR: 12.4529455667425
Angular difference between Flight and Ground position is 1.883151 arcmin
Partial Coding Fraction: 0.4140625 [ including projection effects ]
Duration
T90: 17.3120000362396 +/- 3.1613668309559
Measured from: -1.03999990224838
to: 16.2720001339912 [s; relative to TRIGTIME]
T50: 8.91200000047684 +/- 2.02651226721984
Measured from: 2.24000012874603
to: 11.1520001292229 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.50799995660782
to: 2.50799995660782 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.11199998855591
to: 17.8719999790192 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.426921 0.407293 0.263715 0.061487
0.043844 0.045384 0.039624 0.035013 [error]
Peak 0.017753 0.051066 0.023865 0.016596
0.010337 0.010754 0.009476 0.008365 [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 1.49e-07 2.02e-07 2.03e-07 3.69e-07 6.73e-07 9.23e-07 erg/cm2
Error 2.62e-08 2.31e-08 4.03e-08 1.50e-07 9.06e-08 1.90e-07 erg/cm2
Peak flux Power-law 3.17e-01 3.19e-01 2.25e-01 2.53e-01 9.62e-01 1.11e+00 ph/cm2/s
Error 1.57e-01 9.83e-02 7.74e-02 1.83e-01 2.79e-01 3.11e-01 ph/cm2/s
Fluence Cutoff-PL 1.49e-07 2.02e-07 2.03e-07 3.65e-07 6.72e-07 9.19e-07 erg/cm2
Error 2.02e-08 2.31e-08 3.97e-08 6.76e-08 8.92e-08 2.10e-07 erg/cm2
Peak flux Cutoff-PL 2.63e-01 3.46e-01 2.41e-01 9.72e-02 9.16e-01 9.54e-01 ph/cm2/s
Error 2.39e-01 1.53e-01 9.32e-02 2.31e-01 3.75e-01 4.32e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- 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 1.994 0.232 - - 3.65e-03 5.17e-04 60.480 57
CPL 2.378 0.456 145.6 0.0 2.33e-03 0.00e+00 59.660 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.501 0.502 - - 7.70e-03 2.17e-03 53.930 57
CPL 0.532 3.122 75.3 -3.8 2.36e-02 3.76e+03 53.730 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: 3.712000 sec.
T50 in the 50-300 keV band: 2.368000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 19.984 -2.112 17.872
T90 17.312 -1.040 16.272
T50 8.912 2.240 11.152
Peak 1.000 1.508 2.508
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
120.2605 +7.6472 0.0154 45.2 -170.0 1.1469 12.5 TRIG_00683076
------------------------------------------
Foreground time interval of the image:
-2.112 17.872 (delta_t = 19.984 [sec])
Background time interval of the image:
-71.883 -2.112 (delta_t = 69.771 [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 -2.112 sec. to 17.872 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99426 ( -0.224566 0.239591 )
Norm@50keV : 3.65360E-03 ( -0.000526918 0.000507412 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.48 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 57 degrees of freedom
# Null hypothesis probability = 3.514836e-01
Photon flux (15-150 keV) in 19.98 sec: 0.546597 ( -0.0633568 0.0634867 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.7294e-07 ( -8.98952e-08 9.1319e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.112 sec. to 17.872 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.37828 ( -0.731646 0.180365 )
Epeak [keV] : 145.635 ( )
Norm@50keV : 2.33069E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.66 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 56 degrees of freedom
# Null hypothesis probability = 3.442661e-01
Photon flux (15-150 keV) in 19.98 sec: 0.547967 ( -0.065096 0.062439 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.72493e-07 ( -8.94585e-08 8.90369e-08 ) ergs/cm2
Band function
Time interval is from -2.112 sec. to 17.872 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.56157 ( 1.56259 1.56259 )
beta : -1.99415 ( 1.9942 0.22437 )
Epeak [keV] : 12.9559 ( -12.6198 -12.6198 )
Norm@50keV : 1.01582E-02 ( -0.0102279 13.0601 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.48 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 55 degrees of freedom
# Null hypothesis probability = 2.847407e-01
Photon flux (15-150 keV) in 19.98 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] : 10.2815 (-1.79153 2.1736)
R^2/D10^2 : 0.214890 (-0.109457 0.23283)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 93.98 using 59 PHA bins.
# Reduced chi-squared = 1.649 for 57 degrees of freedom
# Null hypothesis probability = 1.481250e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.326e-08 2.245e-08
25- 50 2.410e-07 4.016e-08
50-150 1.362e-07 4.437e-08
15-150 4.705e-07 7.862e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 78.0328 (-26.1819 50.6318)
Norm : 2.53042 (-0.45056 0.59161)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.00 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 57 degrees of freedom
# Null hypothesis probability = 2.181421e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.310e-07 1.969e-08
25- 50 2.143e-07 2.908e-08
50-150 2.974e-07 1.291e-07
15-150 6.427e-07 1.175e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.82074 (-1.24844 1.61078)
R1^2/D10^2 : 3.39824 (-2.34329 10.0347)
kT2 [keV] : 22.0612 (-5.85052 12.5002)
R2^2/D10^2 : 9.73757E-03 (-0.00765855 0.0127948)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.99 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 55 degrees of freedom
# Null hypothesis probability = 2.694218e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.599e-07 7.104e-08
25- 50 1.776e-07 7.588e-08
50-150 3.400e-07 1.846e-07
15-150 6.774e-07 2.382e-07
Peak spectrum fit
Power-law model
Time interval is from 1.508 sec. to 2.508 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50099 ( -0.496129 0.507433 )
Norm@50keV : 7.70019E-03 ( -0.00217915 0.00215852 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.93 using 59 PHA bins.
# Reduced chi-squared = 0.9462 for 57 degrees of freedom
# Null hypothesis probability = 5.908335e-01
Photon flux (15-150 keV) in 1 sec: 0.961542 ( -0.277402 0.27966 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.30361e-08 ( -2.1941e-08 2.23206e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.508 sec. to 2.508 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.532458 ( -0.509932 5.73491 )
Epeak [keV] : 75.3375 ( -66.6566 -74.1842 )
Norm@50keV : 2.36293E-02 ( -0.0252732 7514.04 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.73 using 59 PHA bins.
# Reduced chi-squared = 0.9594 for 56 degrees of freedom
# Null hypothesis probability = 5.614111e-01
Photon flux (15-150 keV) in 1 sec: 0.916322 ( -0.437422 0.313278 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.76257e-08 ( -3.35482e-08 2.68814e-08 ) ergs/cm2
Band function
Time interval is from 1.508 sec. to 2.508 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.83711 ( -4.83711 -4.83711 )
beta : -2.60619 ( 2.60619 1.14572 )
Epeak [keV] : 47.2315 ( -47.2315 11.8897 )
Norm@50keV : 15.7211 ( -4.29022 5.85208e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.78 using 59 PHA bins.
# Reduced chi-squared = 0.9596 for 55 degrees of freedom
# Null hypothesis probability = 5.600961e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.53962e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.1818 (-3.29707 5.10623)
R^2/D10^2 : 0.138174 (-0.0935062 0.220701)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.83 using 59 PHA bins.
# Reduced chi-squared = 0.9443 for 57 degrees of freedom
# Null hypothesis probability = 5.949006e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.863e-09 3.770e-09
25- 50 2.208e-08 1.249e-08
50-150 2.944e-08 1.882e-08
15-150 5.739e-08 3.335e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.359 (-199.363 -199.363)
Norm : 3.95636 (-1.09592 1.40478)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.86 using 59 PHA bins.
# Reduced chi-squared = 0.9449 for 57 degrees of freedom
# Null hypothesis probability = 5.936376e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.852e-09 6.085e-09
25- 50 1.895e-08 1.143e-08
50-150 4.156e-08 2.545e-08
15-150 7.037e-08 4.192e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.46542 (-1.55406 2.08147)
R1^2/D10^2 : 1.05776E+04 (-5413.55 -5418.46)
kT2 [keV] : 15.2148 (-3.75078 6.29573)
R2^2/D10^2 : 0.102739 (-0.0517676 0.112333)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.59 using 59 PHA bins.
#Fit statistic : Chi-Squared = 50.56 using 59 PHA bins.
# Reduced chi-squared = 0.9198 for 55 degrees of freedom
# Reduced chi-squared = 0.9192 for 55 degrees of freedom
# Null hypothesis probability = 6.436144e-01
# Null hypothesis probability = 6.448604e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.587e-09 4.114e-09
25- 50 2.002e-08 1.206e-08
50-150 3.149e-08 2.038e-08
15-150 6.110e-08 3.451e-08
Plot creation:
Mon Apr 18 10:51:19 EDT 2016