batgrbproduct Analysis for Trigger=586998
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): Tue Feb 18 05:33:46 EST 2014
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger586998/GCN5_download_cron
======================================================================
Trigger: 00586998 Segment: 000
BAT Trigger Time: 414375036.224 [s; MET]
Trigger Stop: 414375037.248 [s; MET]
UTC: 2014-02-18T00:10:24.565820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 266.12964477407 Dec: -28.7397154083901 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 16.41
Image Trigger?: NO
Rate S/N Ratio: 30.9515750810843 [ if not an image trigger ]
Image S/N Ratio: 16.41
Flight Position: [ source = BAT ]
RA: 266.12964477407 Dec: -28.7397154083901 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 266.133049919437 Dec: -28.7442590795864 [deg; J2000]
{ 17h 44m 31.9s , -28d 44' 39.3" }
+/- 1.12968168278388 [arcmin] (estimated 90% radius based on SNR)
+/- 0.451752048026331 [arcmin] (formal 1-sigma fit error)
SNR: 25.554467004518
Angular difference between Flight and Ground position is 0.326208 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 12.4679999947548 +/- 2.23896586640093
Measured from: -0.851999878883362
to: 11.6160001158714 [s; relative to TRIGTIME]
T50: 4.92799997329712 +/- 1.04712367451868
Measured from: 0.620000123977661
to: 5.54800009727478 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0320000052452087
to: 1.03200000524521 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.51199996471405
to: 16.2200000286102 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.054505 0.444446 0.008020 0.010329
0.034494 0.029273 0.022443 0.018852 [error]
Peak 0.177997 0.090773 0.003348 -0.004997
0.009746 0.007852 0.005391 0.004376 [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 3.25e-07 1.66e-07 5.21e-08 2.10e-08 5.55e-07 5.64e-07 erg/cm2
Error 2.72e-08 1.59e-08 1.11e-08 7.89e-09 3.99e-08 4.17e-08 erg/cm2
Peak flux Power-law 1.85e+00 5.91e-01 1.05e-01 2.16e-02 2.56e+00 2.57e+00 ph/cm2/s
Error 1.99e-01 7.22e-02 2.76e-02 9.75e-03 2.38e-01 2.38e-01 ph/cm2/s
Fluence Cutoff-PL 3.11e-07 1.73e-07 1.28e-08 4.51e-11 4.97e-07 4.97e-07 erg/cm2
Error 3.00e-08 1.94e-08 9.86e-09 2.87e-10 3.94e-08 3.94e-08 erg/cm2
Peak flux Cutoff-PL 1.74e+00 6.78e-01 2.53e-02 2.43e-05 2.45e+00 2.45e+00 ph/cm2/s
Error 2.25e-01 9.37e-02 2.13e-02 2.42e-04 2.44e-01 2.44e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.669 0.196 - - 1.79e-03 2.89e-04 65.140 57
CPL 1.000 0.000 50.0 0.0 9.22e-03 0.00e+00 332.780 56
The chi2 of BB fit is 49.28 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 3.497 0.242 - - 6.35e-03 1.32e-03 78.930 57
CPL 1.000 0.000 50.0 0.0 3.08e-02 0.00e+00 230.120 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 17.732 -1.512 16.220
T90 12.468 -0.852 11.616
T50 4.928 0.620 5.548
Peak 1.000 0.032 1.032
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
266.1330 -28.7443 0.0075 0.4 127.9 1.3957 25.6 TRIG_00586998
------------------------------------------
Foreground time interval of the image:
-1.512 16.220 (delta_t = 17.732 [sec])
Background time interval of the image:
-119.224 -1.512 (delta_t = 117.712 [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 -1.512 sec. to 16.220 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.66877 ( -0.191681 0.201053 )
Norm@50keV : 1.78655E-03 ( -0.000281245 0.000297727 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.14 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 57 degrees of freedom
# Null hypothesis probability = 2.146660e-01
Photon flux (15-150 keV) in 17.73 sec: 0.830205 ( -0.0594288 0.0595569 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.5474e-07 ( -3.98349e-08 4.00102e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.512 sec. to 16.220 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 9.22242E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 332.78 using 59 PHA bins.
# Reduced chi-squared = 5.9425 for 56 degrees of freedom
# Null hypothesis probability = 5.588549e-41
Photon flux (15-150 keV) in 17.73 sec: 0.780298 ( -0.063354 0.063125 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.96699e-07 ( -3.9045e-08 3.97897e-08 ) ergs/cm2
Band function
Time interval is from -1.512 sec. to 16.220 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.574361 ( -1.1215 2.97055 )
beta : -9.37167 ( 9.37167 19.344 )
Epeak [keV] : 12.5534 ( -5.71595 5.28542 )
Norm@50keV : 0.304459 ( -0.338972 29.7317 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.19 using 59 PHA bins.
# Reduced chi-squared = 0.8217 for 55 degrees of freedom
# Null hypothesis probability = 8.244631e-01
Photon flux (15-150 keV) in 17.73 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] : 4.70909 (-0.308149 0.331005)
R^2/D10^2 : 8.83598 (-2.68044 3.91836)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.28 using 59 PHA bins.
# Reduced chi-squared = 0.8646 for 57 degrees of freedom
# Null hypothesis probability = 7.564745e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.979e-07 3.360e-08
25- 50 1.673e-07 2.003e-08
50-150 5.046e-09 1.933e-09
15-150 4.703e-07 4.335e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.1029 (-1.33553 1.62496)
Norm : 19.6115 (-4.03992 5.31942)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.32 using 59 PHA bins.
# Reduced chi-squared = 0.8126 for 57 degrees of freedom
# Null hypothesis probability = 8.430631e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.170e-07 2.970e-08
25- 50 1.731e-07 2.019e-08
50-150 1.925e-08 6.647e-09
15-150 5.094e-07 4.335e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.06142 (-2.3102 8.10433)
R1^2/D10^2 : 1.49202 (-16.5138 21821.3)
kT2 [keV] : 3.36960 ( )
R2^2/D10^2 : 27.4094 (-20.4235 18535)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.03 using 59 PHA bins.
#Fit statistic : Chi-Squared = 44.98 using 59 PHA bins.
# Reduced chi-squared = 0.8187 for 55 degrees of freedom
# Reduced chi-squared = 0.8179 for 55 degrees of freedom
# Null hypothesis probability = 8.290520e-01
# Null hypothesis probability = 8.303599e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.121e-07 1.673e-07
25- 50 1.724e-07 8.505e-08
50-150 1.405e-08 8.596e-09
15-150 4.985e-07 2.571e-07
Peak spectrum fit
Power-law model
Time interval is from 0.032 sec. to 1.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.49712 ( -0.233156 0.251692 )
Norm@50keV : 6.35450E-03 ( -0.00128083 0.00135839 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.93 using 59 PHA bins.
# Reduced chi-squared = 1.385 for 57 degrees of freedom
# Null hypothesis probability = 2.882267e-02
Photon flux (15-150 keV) in 1 sec: 2.56401 ( -0.238022 0.238106 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.98143e-08 ( -9.94076e-09 1.00753e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.032 sec. to 1.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 3.07935E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 230.12 using 59 PHA bins.
# Reduced chi-squared = 4.1093 for 56 degrees of freedom
# Null hypothesis probability = 5.655036e-23
Photon flux (15-150 keV) in 1 sec: 2.44524 ( -0.2441 0.24338 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.9958e-08 ( -8.8083e-09 8.9976e-09 ) ergs/cm2
Band function
Time interval is from 0.032 sec. to 1.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.632979 ( -2.16709 2.06924 )
beta : -8.12204 ( 9.80009 19.7789 )
Epeak [keV] : 17.7092 ( -6.85773 1.74774 )
Norm@50keV : 5.77575 ( -3.35913 164.686 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.95 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 55 degrees of freedom
# Null hypothesis probability = 2.420250e-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] : 5.05009 (-0.40583 0.429495)
R^2/D10^2 : 20.4230 (-6.86463 10.8)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.82 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 57 degrees of freedom
# Null hypothesis probability = 2.776614e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.168e-08 6.960e-09
25- 50 3.459e-08 5.445e-09
50-150 1.476e-09 6.790e-10
15-150 8.775e-08 1.016e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.3328 (-1.85316 2.29141)
Norm : 52.8568 (-11.1898 16.8492)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.97 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 57 degrees of freedom
# Null hypothesis probability = 2.189305e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.504e-08 7.760e-09
25- 50 3.347e-08 5.125e-09
50-150 4.638e-09 1.863e-09
15-150 9.315e-08 1.083e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.09075 (-1.85537 191.537)
R1^2/D10^2 : 593.318 (-1721.36 -1721.36)
kT2 [keV] : 5.43177 (-0.561741 -5.36647)
R2^2/D10^2 : 13.0981 (-14.2147 11.7011)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.77 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 55 degrees of freedom
# Null hypothesis probability = 2.758140e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.187e-08 2.663e-08
25- 50 3.522e-08 1.974e-08
50-150 2.090e-09 1.424e-09
15-150 8.918e-08 4.590e-08
Plot creation:
Tue Feb 18 05:39:25 EST 2014