batgrbproduct Analysis for Trigger=685124
Analysis Summary
Special note:
- The soft spike in the light curve of ~10 msec duration at T-135.5 sec is of instrumental and not astrophysical origin.
Our analysis therefore excludes the time before T-135 sec.
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 May 5 16:09:14 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger685124/batgroup_hand_proc
======================================================================
Trigger: 00685124 Segment: 000
BAT Trigger Time: 484083053.568 [s; MET]
Trigger Stop: 484083057.664 [s; MET]
UTC: 2016-05-04T19:30:37.347200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 170.043522431995 Dec: 55.9967792055369 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.82
Image Trigger?: NO
Rate S/N Ratio: 13.7840487520902 [ if not an image trigger ]
Image S/N Ratio: 6.82
Flight Position: [ source = BAT ]
RA: 170.043522431995 Dec: 55.9967792055369 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 170.072950088088 Dec: 56.0015749596192 [deg; J2000]
{ 11h 20m 17.5s , +56d 00' 05.7" }
+/- 1.67517045445525 [arcmin] (estimated 90% radius based on SNR)
+/- 0.594950288266315 [arcmin] (formal 1-sigma fit error)
SNR: 14.5557332378279
Angular difference between Flight and Ground position is 1.028439 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 53.8599999547005 +/- 6.04395397582683
Measured from: -40.1680000424385
to: 13.691999912262 [s; relative to TRIGTIME]
T50: 27.879999935627 +/- 6.01061064349325
Measured from: -24.3000000119209
to: 3.57999992370605 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.507999956607819
to: 1.50799995660782 [s; relative to TRIGTIME]
Total Fluence
Measured from: -42.3120000362396
to: 16.1959999799728 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.546444 0.450588 0.339470 0.020673
0.045089 0.044994 0.039386 0.034287 [error]
Peak 0.026145 0.030603 0.024410 0.011308
0.006224 0.006238 0.005528 0.004730 [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 1.45e-07 2.12e-07 2.31e-07 4.70e-07 7.31e-07 1.06e-06 erg/cm2
Error 2.22e-08 2.06e-08 3.99e-08 1.68e-07 8.88e-08 2.06e-07 erg/cm2
Peak flux Power-law 1.97e-01 2.17e-01 1.71e-01 2.23e-01 6.68e-01 8.09e-01 ph/cm2/s
Error 7.49e-02 5.01e-02 4.53e-02 1.27e-01 1.41e-01 1.78e-01 ph/cm2/s
Fluence Cutoff-PL 1.45e-07 2.12e-07 2.30e-07 4.62e-07 7.30e-07 1.05e-06 erg/cm2
Error 2.21e-08 2.06e-08 3.99e-08 2.10e-07 8.88e-08 2.37e-07 erg/cm2
Peak flux Cutoff-PL 1.96e-01 2.17e-01 1.72e-01 2.22e-01 6.68e-01 8.07e-01 ph/cm2/s
Error 6.03e-02 5.31e-02 4.72e-02 1.86e-01 1.42e-01 2.05e-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 1.878 0.203 - - 1.36e-03 1.65e-04 35.380 57
CPL 2.565 0.582 192.8 0.0 6.47e-04 0.00e+00 34.170 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 1.342 0.386 - - 5.56e-03 1.18e-03 54.710 57
CPL 1.339 2.218 10000.0 0.0 5.58e-03 -2.20e-03 54.710 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: 35.008000 sec.
T50 in the 50-300 keV band: 24.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 58.508 -42.312 16.196
T90 53.860 -40.168 13.692
T50 27.880 -24.300 3.580
Peak 1.000 0.508 1.508
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
170.0730 56.0016 0.0132 17.1544 42.9869 1.3156278 14.556 TRIG_00685124
Foreground time interval of the image:
-42.312 16.196 (delta_t = 58.508 [sec])
Background time interval of the image:
-239.568 -42.312 (delta_t = 197.256 [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 -42.312 sec. to 16.196 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87768 ( -0.198117 0.207619 )
Norm@50keV : 1.35993E-03 ( -0.0001678 0.000162485 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.38 using 59 PHA bins.
# Reduced chi-squared = 0.6207 for 57 degrees of freedom
# Null hypothesis probability = 9.891038e-01
Photon flux (15-150 keV) in 58.51 sec: 0.193341 ( -0.0189322 0.0189485 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.3148e-07 ( -8.78352e-08 8.96841e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -42.312 sec. to 16.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.56507 ( -0.920614 0.243326 )
Epeak [keV] : 192.782 ( )
Norm@50keV : 6.47166E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.17 using 59 PHA bins.
# Reduced chi-squared = 0.6103 for 56 degrees of freedom
# Null hypothesis probability = 9.905988e-01
Photon flux (15-150 keV) in 58.51 sec: 0.193525 ( -0.01907 0.018808 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.30298e-07 ( -8.67586e-08 9.08134e-08 ) ergs/cm2
Band function
Time interval is from -42.312 sec. to 16.196 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48228 ( 1.4831 1.4831 )
beta : -1.87761 ( 1.87764 0.197966 )
Epeak [keV] : 16.1929 ( -15.9584 -15.9584 )
Norm@50keV : 3.50820E-03 ( -0.00351691 5.07643 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.38 using 59 PHA bins.
# Reduced chi-squared = 0.6433 for 55 degrees of freedom
# Null hypothesis probability = 9.816693e-01
Photon flux (15-150 keV) in 58.51 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] : 10.6560 (-1.61422 1.98229)
R^2/D10^2 : 6.68302E-02 (-0.0308515 0.0570114)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.14 using 59 PHA bins.
# Reduced chi-squared = 1.388 for 57 degrees of freedom
# Null hypothesis probability = 2.782610e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.212e-08 1.773e-08
25- 50 2.499e-07 3.274e-08
50-150 1.563e-07 4.230e-08
15-150 4.983e-07 6.805e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 95.1041 (-31.5965 64.096)
Norm : 0.848850 (-0.118046 0.153154)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.25 using 59 PHA bins.
# Reduced chi-squared = 0.7061 for 57 degrees of freedom
# Null hypothesis probability = 9.546708e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.298e-07 1.951e-08
25- 50 2.221e-07 2.580e-08
50-150 3.496e-07 1.443e-07
15-150 7.014e-07 1.582e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.90171 (-1.15812 1.3704)
R1^2/D10^2 : 1.04977 (-0.6632 2.49267)
kT2 [keV] : 23.3147 (-5.56031 9.93283)
R2^2/D10^2 : 3.18562E-03 (-0.0022083 0.00534594)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.71 using 59 PHA bins.
# Reduced chi-squared = 0.6311 for 55 degrees of freedom
# Null hypothesis probability = 9.852148e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.561e-07 6.980e-08
25- 50 1.854e-07 5.362e-08
50-150 4.078e-07 2.031e-07
15-150 7.493e-07 2.762e-07
Peak spectrum fit
Power-law model
Time interval is from 0.508 sec. to 1.508 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34186 ( -0.387567 0.384434 )
Norm@50keV : 5.55703E-03 ( -0.00118047 0.00117088 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.71 using 59 PHA bins.
# Reduced chi-squared = 0.9598 for 57 degrees of freedom
# Null hypothesis probability = 5.614711e-01
Photon flux (15-150 keV) in 1 sec: 0.668353 ( -0.141133 0.141461 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.43743e-08 ( -1.29701e-08 1.32823e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.508 sec. to 1.508 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33856 ( -1.39412 3.04095 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 5.57880E-03 ( -0.00118719 -0.0055789 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.71 using 59 PHA bins.
# Reduced chi-squared = 0.9770 for 56 degrees of freedom
# Null hypothesis probability = 5.237336e-01
Photon flux (15-150 keV) in 1 sec: 0.668043 ( -0.142917 0.141394 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.4241e-08 ( -1.36754e-08 1.33057e-08 ) ergs/cm2
Band function
Time interval is from 0.508 sec. to 1.508 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.02641 ( 1.02236 5.93744 )
beta : -1.34490 ( 1.34594 0.391078 )
Epeak [keV] : 56.4813 ( -58.9817 -58.9817 )
Norm@50keV : 1.04940E-02 ( -0.00608291 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.70 using 59 PHA bins.
# Reduced chi-squared = 0.9946 for 55 degrees of freedom
# Null hypothesis probability = 4.858911e-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] : 16.7179 (-4.62259 7.05417)
R^2/D10^2 : 5.23831E-02 (-0.0357915 0.105498)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.65 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 57 degrees of freedom
# Null hypothesis probability = 3.134464e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.995e-09 1.245e-09
25- 50 1.307e-08 6.278e-09
50-150 2.595e-08 1.255e-08
15-150 4.202e-08 1.743e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-95.3676 -199.363)
Norm : 2.74203 (-0.574888 0.574903)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.75 using 59 PHA bins.
# Reduced chi-squared = 0.9781 for 57 degrees of freedom
# Null hypothesis probability = 5.219056e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.828e-09 4.037e-09
25- 50 1.313e-08 7.675e-09
50-150 2.881e-08 1.643e-08
15-150 4.877e-08 2.799e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.83731 (-4.28468 6.44079)
R1^2/D10^2 : 0.725283 (-0.625387 48.9223)
kT2 [keV] : 31.1650 (-14.3782 -31.2958)
R2^2/D10^2 : 5.70329E-03 (-0.00525781 0.0412509)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.00 using 59 PHA bins.
# Reduced chi-squared = 1.000 for 55 degrees of freedom
# Null hypothesis probability = 4.744876e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.159e-09 3.689e-09
25- 50 1.225e-08 6.725e-09
50-150 3.685e-08 2.220e-08
15-150 5.526e-08 2.836e-08
Plot creation:
Thu May 5 16:14:42 EDT 2016