batgrbproduct Analysis for Trigger=687124
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 May 23 13:07:08 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger687124/GCN5_download_cron
======================================================================
Trigger: 00687124 Segment: 000
BAT Trigger Time: 485555038.608 [s; MET]
Trigger Stop: 485555038.624 [s; MET]
UTC: 2016-05-21T20:23:42.306160 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 293.730319051045 Dec: 21.9048472561028 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 14.02
Image Trigger?: NO
Rate S/N Ratio: 82.8130424510536 [ if not an image trigger ]
Image S/N Ratio: 14.02
Flight Position: [ source = BAT ]
RA: 293.730319051045 Dec: 21.9048472561028 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 293.715250238091 Dec: 21.9106703207017 [deg; J2000]
{ 19h 34m 51.7s , +21d 54' 38.4" }
+/- 1.26506165684059 [arcmin] (estimated 90% radius based on SNR)
+/- 0.536112693403089 [arcmin] (formal 1-sigma fit error)
SNR: 21.739248811181
Angular difference between Flight and Ground position is 0.908690 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.195999920368195 +/- 0.0561426702605141
Measured from: -0.00799983739852905
to: 0.188000082969666 [s; relative to TRIGTIME]
T50: 0.123999953269958 +/- 0.0960000157356262
Measured from: 0.00400012731552124
to: 0.12800008058548 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.381999969482422
to: 0.618000030517578 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0079999566078186
to: 0.240000009536743 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.067572 0.068705 0.026691 0.001008
0.005011 0.004928 0.003575 0.002148 [error]
Peak 0.075939 0.075422 0.023985 -0.001645
0.007180 0.007265 0.005716 0.004241 [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 2.24e-08 1.92e-08 1.12e-08 9.72e-09 5.70e-08 6.25e-08 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 7.34e-01 4.84e-01 2.08e-01 1.23e-01 1.49e+00 1.55e+00 ph/cm2/s
Error 1.05e-01 5.61e-02 4.24e-02 4.51e-02 1.66e-01 1.75e-01 ph/cm2/s
Fluence Cutoff-PL 1.86e-08 2.87e-08 1.59e-08 2.26e-09 6.53e-08 6.55e-08 erg/cm2
Error 2.63e-09 2.92e-09 3.19e-09 1.42e-09 6.22e-09 6.35e-09 erg/cm2
Peak flux Cutoff-PL 6.73e-01 5.76e-01 1.81e-01 1.73e-02 1.45e+00 1.45e+00 ph/cm2/s
Error 1.17e-01 8.12e-02 5.72e-02 2.95e-02 1.67e-01 1.68e-01 ph/cm2/s
Fluence Band 1.86e-08 2.84e-08 1.60e-08 2.43e-09 6.54e-08 6.55e-08 erg/cm2
Error 2.26e-09 2.70e-09 2.74e-09 -------- 6.06e-09 -------- 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 2.780 0.000 - - 2.10e-02 0.00e+00 131.640 57
CPL 0.487 0.644 32.0 5.6 3.88e-01 0.00e+00 77.030 56
The chi2 of BB fit is 93.39 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 2.219 0.206 - - 8.89e-03 1.40e-03 62.440 57
CPL 0.674 1.143 32.1 9.4 8.03e-02 2.63e-01 54.530 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: 0.192000 sec.
T50 in the 50-300 keV band: 0.192000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.248 -0.008 0.240
T90 0.196 -0.008 0.188
T50 0.124 0.004 0.128
Peak 1.000 -0.382 0.618
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
293.7153 +21.9107 0.0089 0.0 155.0 0.1642 21.7 TRIG_00687124
------------------------------------------
Foreground time interval of the image:
-0.008 0.240 (delta_t = 0.248 [sec])
Background time interval of the image:
-239.608 -167.908 (delta_t = 71.700 [sec])
-119.608 -13.328 (delta_t = 106.280 [sec])
-12.608 -0.008 (delta_t = 12.600 [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 -0.008 sec. to 0.240 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.77990 ( )
Norm@50keV : 2.09697E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 131.64 using 59 PHA bins.
# Reduced chi-squared = 2.3094 for 57 degrees of freedom
# Null hypothesis probability = 7.740885e-08
Photon flux (15-150 keV) in 0.248 sec: 4.93798 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.69671e-08 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 0.240 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.486902 ( -0.701294 0.587488 )
Epeak [keV] : 31.9912 ( -6.40928 4.7266 )
Norm@50keV : 0.387787 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.03 using 59 PHA bins.
# Reduced chi-squared = 1.375 for 56 degrees of freedom
# Null hypothesis probability = 3.268058e-02
Photon flux (15-150 keV) in 0.248 sec: 5.17627 ( -0.46131 0.46158 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.52924e-08 ( -6.22034e-09 6.2181e-09 ) ergs/cm2
Band function
Time interval is from -0.008 sec. to 0.240 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.472572 ( -0.496171 0.763045 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 32.0147 ( -6.10539 3.72004 )
Norm@50keV : 0.396013 ( -0.210937 0.595909 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.03 using 59 PHA bins.
# Reduced chi-squared = 1.401 for 55 degrees of freedom
# Null hypothesis probability = 2.660156e-02
Photon flux (15-150 keV) in 0.248 sec: 5.17897 ( 1.82103 -0.44523 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.54095e-08 ( -6.54078e-08 -6.04847e-09 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.92401 (-0.853566 0.92103)
R^2/D10^2 : 3.94841 (-1.28089 1.93757)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 93.39 using 59 PHA bins.
# Reduced chi-squared = 1.638 for 57 degrees of freedom
# Null hypothesis probability = 1.687229e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.512e-08 2.154e-09
25- 50 3.170e-08 2.964e-09
50-150 1.178e-08 2.951e-09
15-150 5.860e-08 6.386e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 35.5417 (-4.70056 5.0302)
Norm : 38.3183 (-4.93006 5.7181)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.25 using 59 PHA bins.
# Reduced chi-squared = 1.460 for 57 degrees of freedom
# Null hypothesis probability = 1.326052e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.089e-08 2.176e-09
25- 50 2.605e-08 2.221e-09
50-150 1.762e-08 3.607e-09
15-150 6.455e-08 6.274e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.80564 (-1.1951 1.31888)
R1^2/D10^2 : 26.7226 (-15.9109 57.7391)
kT2 [keV] : 12.8392 (-1.88501 1.97822)
R2^2/D10^2 : 0.654776 (-0.360789 0.629661)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.65 using 59 PHA bins.
# Reduced chi-squared = 1.339 for 55 degrees of freedom
# Null hypothesis probability = 4.735045e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.939e-08 8.399e-09
25- 50 2.740e-08 1.027e-08
50-150 2.023e-08 1.108e-08
15-150 6.703e-08 2.472e-08
Peak spectrum fit
Power-law model
Time interval is from -0.382 sec. to 0.618 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.21940 ( -0.198249 0.213413 )
Norm@50keV : 8.89408E-03 ( -0.00140726 0.00138544 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.44 using 59 PHA bins.
# Reduced chi-squared = 1.095 for 57 degrees of freedom
# Null hypothesis probability = 2.889984e-01
Photon flux (15-150 keV) in 1 sec: 1.48762 ( -0.166424 0.166425 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.38567e-08 ( -1.13632e-08 1.16545e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.382 sec. to 0.618 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.673724 ( -1.28618 0.999711 )
Epeak [keV] : 32.1434 ( -11.8929 6.98791 )
Norm@50keV : 8.03423E-02 ( -0.0803422 0.446287 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.53 using 59 PHA bins.
# Reduced chi-squared = 0.9738 for 56 degrees of freedom
# Null hypothesis probability = 5.304935e-01
Photon flux (15-150 keV) in 1 sec: 1.44558 ( -0.16628 0.1669 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.45862e-08 ( -1.08929e-08 1.20734e-08 ) ergs/cm2
Band function
Time interval is from -0.382 sec. to 0.618 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.673539 ( -0.857098 3.8724 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 32.1365 ( -11.8894 6.98405 )
Norm@50keV : 8.03686E-02 ( -0.0803685 0.447098 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.53 using 59 PHA bins.
# Reduced chi-squared = 0.9915 for 55 degrees of freedom
# Null hypothesis probability = 4.923533e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.49072e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.57884 (-0.991804 1.09649)
R^2/D10^2 : 1.29076 (-0.488684 0.803866)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.79 using 59 PHA bins.
# Reduced chi-squared = 1.084 for 57 degrees of freedom
# Null hypothesis probability = 3.090023e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.801e-08 3.580e-09
25- 50 3.545e-08 4.985e-09
50-150 1.165e-08 3.910e-09
15-150 6.511e-08 9.820e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 44.3638 (-10.5678 15.6252)
Norm : 9.20531 (-1.60365 2.07717)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.58 using 59 PHA bins.
# Reduced chi-squared = 0.9751 for 57 degrees of freedom
# Null hypothesis probability = 5.285191e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.183e-08 3.050e-09
25- 50 2.997e-08 3.920e-09
50-150 2.587e-08 8.310e-09
15-150 7.768e-08 1.257e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.92513 (-2.05718 18.5695)
R1^2/D10^2 : 6.39821 (-4.59463 47.0443)
kT2 [keV] : 12.4735 (-3.15151 11.0679)
R2^2/D10^2 : 0.202428 (-0.193138 0.625096)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.11 using 59 PHA bins.
# Reduced chi-squared = 0.9838 for 55 degrees of freedom
# Null hypothesis probability = 5.086324e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.132e-08 1.140e-08
25- 50 3.118e-08 1.601e-08
50-150 2.142e-08 1.296e-08
15-150 7.393e-08 3.809e-08
Plot creation:
Mon May 23 13:09:52 EDT 2016