batgrbproduct Analysis for Trigger=589505
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): Sat Mar 1 11:12:58 EST 2014
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger589505/GCN5_download_cron
======================================================================
Trigger: 00589505 Segment: 000
BAT Trigger Time: 415324272 [s; MET]
Trigger Stop: 415325840 [s; MET]
UTC: 2014-02-28T23:51:00.296980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 266.136018600414 Dec: -28.7399415238985 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 24.74
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 24.74
Flight Position: [ source = BAT ]
RA: 266.136018600414 Dec: -28.7399415238985 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 266.141013748614 Dec: -28.7543449515392 [deg; J2000]
{ 17h 44m 33.8s , -28d 45' 15.6" }
+/- 1.21296590861086 [arcmin] (estimated 90% radius based on SNR)
+/- 0.657741661088986 [arcmin] (formal 1-sigma fit error)
SNR: 23.0852548371702
Angular difference between Flight and Ground position is 0.903272 arcmin
Partial Coding Fraction: 0.890625 [ including projection effects ]
Duration
T90: 1568 +/-
Measured from: 0
to: 1568 [s; relative to TRIGTIME]
T50: 1568 +/-
Measured from: 0
to: 1568 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1568 second)
Measured from: 0
to: 1568 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1568 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.186425 1.832511 0.112976 -0.072218
0.121533 0.112602 0.092258 0.079325 [error]
Peak 4.186425 1.832511 0.112976 -0.072218
0.121533 0.112602 0.092258 0.079325 [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 1.40e-06 7.46e-07 2.47e-07 1.06e-07 2.45e-06 2.50e-06 erg/cm2
Error 1.12e-07 6.50e-08 4.89e-08 3.73e-08 1.63e-07 1.72e-07 erg/cm2
Peak flux Power-law 1.32e-01 3.98e-02 6.59e-03 1.26e-03 1.79e-01 1.79e-01 ph/cm2/s
Error 1.08e-02 3.29e-03 1.26e-03 4.20e-04 1.19e-02 1.19e-02 ph/cm2/s
Fluence Cutoff-PL 1.33e-06 7.66e-07 4.76e-08 8.79e-11 2.14e-06 2.14e-06 erg/cm2
Error 1.25e-07 8.10e-08 3.95e-08 7.21e-10 1.64e-07 1.64e-07 erg/cm2
Peak flux Cutoff-PL 1.22e-01 4.22e-02 1.45e-03 1.42e-06 1.65e-01 1.65e-01 ph/cm2/s
Error 1.22e-02 4.03e-03 1.13e-03 1.13e-05 1.30e-02 1.30e-02 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 3.593 0.185 - - 4.10e-04 6.10e-05 74.690 57
CPL 1.000 0.000 50.0 0.0 2.12e-03 0.00e+00 356.500 56
The chi2 of BB fit is 54.29 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 3.593 0.185 - - 4.10e-04 6.10e-05 74.690 57
CPL 1.000 0.000 50.0 0.0 2.12e-03 0.00e+00 356.500 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 1568.000 0.000 1568.000
T90 1568.000 0.000 1568.000
T50 1568.000 0.000 1568.000
Peak 1568.000 0.000 1568.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
266.1410 -28.7543 0.0083 21.4 16.8 6.5660 23.1 TRIG_00589505
------------------------------------------
Foreground time interval of the image:
276.000 303.020 (delta_t = 27.020 [sec])
631.000 963.055 (delta_t = 332.055 [sec])
Background time interval of the image:
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
Multiple GTIs in the spectrum
tstart tstop
276.000000 303.020000
631.000400 963.055100
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.59301 ( -0.180986 0.188777 )
Norm@50keV : 4.09772E-04 ( -5.93777e-05 6.2535e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.69 using 59 PHA bins.
# Reduced chi-squared = 1.310 for 57 degrees of freedom
# Null hypothesis probability = 5.799605e-02
Photon flux (15-150 keV) in 359.1 sec: 0.178820 ( -0.0119026 0.0119454 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.45394e-06 ( -1.62644e-07 1.63491e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
276.000000 303.020000
631.000400 963.055100
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.11700E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 356.50 using 59 PHA bins.
# Reduced chi-squared = 6.3661 for 56 degrees of freedom
# Null hypothesis probability = 2.502283e-45
Photon flux (15-150 keV) in 359.1 sec: 0.165251 ( -0.013045 0.012983 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.13952e-06 ( -1.62514e-07 1.66425e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
276.000000 303.020000
631.000400 963.055100
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.607629 ( -1.18062 3.88276 )
beta : -5.34712 ( 5.35965 1.12315 )
Epeak [keV] : 16.4713 ( -6.51369 1.46575 )
Norm@50keV : 0.472089 ( -0.462674 530.662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.71 using 59 PHA bins.
# Reduced chi-squared = 0.9401 for 55 degrees of freedom
# Null hypothesis probability = 6.012916e-01
Photon flux (15-150 keV) in 359.1 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] : 4.77793 (-0.285353 0.305748)
R^2/D10^2 : 1.76915 (-0.495743 0.698916)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.29 using 59 PHA bins.
# Reduced chi-squared = 0.9524 for 57 degrees of freedom
# Null hypothesis probability = 5.774456e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.284e-06 1.287e-07
25- 50 7.482e-07 8.385e-08
50-150 2.430e-08 8.816e-09
15-150 2.056e-06 1.573e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.4595 (-1.31154 1.59871)
Norm : 4.00672 (-0.690255 1.00608)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.89 using 59 PHA bins.
# Reduced chi-squared = 0.9630 for 57 degrees of freedom
# Null hypothesis probability = 5.545904e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.367e-06 1.431e-07
25- 50 7.717e-07 8.349e-08
50-150 9.184e-08 2.788e-08
15-150 2.231e-06 1.664e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.47304 (-4.47304 0.483637)
R1^2/D10^2 : 2.32723 (-0.888515 171.126)
kT2 [keV] : 11.4593 (-11.4593 -11.4593)
R2^2/D10^2 : 4.24754E-03 (-0.00424755 1.95492)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.84 using 59 PHA bins.
# Reduced chi-squared = 0.9425 for 55 degrees of freedom
# Null hypothesis probability = 5.961648e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.316e-06 2.832e-07
25- 50 7.509e-07 2.465e-07
50-150 1.103e-07 6.784e-08
15-150 2.177e-06 5.243e-07
Peak spectrum fit
Power-law model
Time interval is from 631.000 sec. to 963.055 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.59301 ( -0.180986 0.188777 )
Norm@50keV : 4.09772E-04 ( -5.93777e-05 6.2535e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.69 using 59 PHA bins.
# Reduced chi-squared = 1.310 for 57 degrees of freedom
# Null hypothesis probability = 5.799605e-02
Photon flux (15-150 keV) in 359.1 sec: 0.178820 ( -0.0119026 0.0119454 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.45394e-06 ( -1.62644e-07 1.63491e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 631.000 sec. to 963.055 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.11700E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 356.50 using 59 PHA bins.
# Reduced chi-squared = 6.3661 for 56 degrees of freedom
# Null hypothesis probability = 2.502283e-45
Photon flux (15-150 keV) in 359.1 sec: 0.165251 ( -0.013045 0.012983 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.13952e-06 ( -1.62514e-07 1.66425e-07 ) ergs/cm2
Band function
Time interval is from 631.000 sec. to 963.055 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.607629 ( -1.18062 3.88276 )
beta : -5.34712 ( 5.35965 1.12315 )
Epeak [keV] : 16.4713 ( -6.44866 1.46574 )
Norm@50keV : 0.472089 ( -0.462674 530.577 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.71 using 59 PHA bins.
# Reduced chi-squared = 0.9401 for 55 degrees of freedom
# Null hypothesis probability = 6.012916e-01
Photon flux (15-150 keV) in 359.1 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] : 4.77793 (-0.285353 0.305748)
R^2/D10^2 : 1.76915 (-0.495743 0.698916)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.29 using 59 PHA bins.
# Reduced chi-squared = 0.9524 for 57 degrees of freedom
# Null hypothesis probability = 5.774456e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.284e-06 1.296e-07
25- 50 7.482e-07 8.044e-08
50-150 2.430e-08 8.320e-09
15-150 2.056e-06 1.569e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.4595 (-1.31154 1.59871)
Norm : 4.00672 (-0.690255 1.00608)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.89 using 59 PHA bins.
# Reduced chi-squared = 0.9630 for 57 degrees of freedom
# Null hypothesis probability = 5.545904e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.367e-06 1.357e-07
25- 50 7.717e-07 8.080e-08
50-150 9.184e-08 2.855e-08
15-150 2.231e-06 1.905e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.47304 (-4.47304 0.483637)
R1^2/D10^2 : 2.32723 (-0.888515 172.409)
kT2 [keV] : 11.4593 (-11.4593 -11.4593)
R2^2/D10^2 : 4.24754E-03 (-0.00424755 1.95492)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.84 using 59 PHA bins.
# Reduced chi-squared = 0.9425 for 55 degrees of freedom
# Null hypothesis probability = 5.961648e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.316e-06 2.803e-07
25- 50 7.509e-07 2.542e-07
50-150 1.103e-07 7.229e-08
15-150 2.177e-06 5.169e-07
Plot creation:
Sat Mar 1 11:19:45 EST 2014