batgrbproduct Analysis for Trigger=554635
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): Sun Apr 28 06:02:10 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger554635/GCN5_download_cron
======================================================================
Trigger: 00554635 Segment: 000
BAT Trigger Time: 388761652.288 [s; MET]
Trigger Stop: 388761653.312 [s; MET]
UTC: 2013-04-27T13:20:41.798740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 314.890834623513 Dec: -22.5305015261419 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.7
Image Trigger?: NO
Rate S/N Ratio: 12.1655250605964 [ if not an image trigger ]
Image S/N Ratio: 8.7
Flight Position: [ source = BAT ]
RA: 314.890834623513 Dec: -22.5305015261419 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 314.900441084028 Dec: -22.5424434741654 [deg; J2000]
{ 20h 59m 36.1s , -22d 32' 32.8" }
+/- 1.30997858456463 [arcmin] (estimated 90% radius based on SNR)
+/- 0.410171618898988 [arcmin] (formal 1-sigma fit error)
SNR: 20.6822650822762
Angular difference between Flight and Ground position is 0.892646 arcmin
Partial Coding Fraction: 0.2226562 [ including projection effects ]
Duration
T90: 28.4319999814034 +/- 8.45389189457727
Measured from: -0.0399998426437378
to: 28.3920001387596 [s; relative to TRIGTIME]
T50: 5.02400004863739 +/- 3.6999805775911
Measured from: 1.59200012683868
to: 6.61600017547607 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.972000002861023
to: 1.97200000286102 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.61599999666214
to: 36.8080000281334 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.634619 0.988006 0.597165 0.163727
0.075270 0.075463 0.064175 0.054228 [error]
Peak 0.091718 0.141238 0.119967 0.044383
0.015560 0.017758 0.015926 0.010891 [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 2.30e-07 3.93e-07 5.12e-07 1.35e-06 1.50e-06 2.48e-06 erg/cm2
Error 3.47e-08 3.71e-08 6.28e-08 3.47e-07 1.51e-07 3.99e-07 erg/cm2
Peak flux Power-law 1.01e+00 1.06e+00 7.93e-01 9.57e-01 3.23e+00 3.82e+00 ph/cm2/s
Error 2.23e-01 1.49e-01 1.20e-01 2.90e-01 4.25e-01 4.93e-01 ph/cm2/s
Fluence Cutoff-PL 2.18e-07 4.12e-07 5.20e-07 7.30e-07 1.46e-06 1.88e-06 erg/cm2
Error 3.91e-08 4.69e-08 6.73e-08 6.10e-07 1.69e-07 6.09e-07 erg/cm2
Peak flux Cutoff-PL 9.68e-01 1.09e+00 8.17e-01 8.31e-01 3.22e+00 3.61e+00 ph/cm2/s
Error 2.56e-01 1.75e-01 1.42e-01 3.11e-01 4.28e-01 6.35e-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 1.619 0.157 - - 4.30e-03 4.07e-04 43.190 57
CPL 1.229 0.594 93.8 -29.6 6.93e-03 5.91e-03 41.940 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.424 0.207 - - 2.64e-02 3.38e-03 40.640 57
CPL 1.182 0.646 176.3 0.0 3.49e-02 3.61e-02 40.350 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: 10.496000 sec.
T50 in the 50-300 keV band: 2.496000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 37.424 -0.616 36.808
T90 28.432 -0.040 28.392
T50 5.024 1.592 6.616
Peak 1.000 0.972 1.972
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
314.9004 -22.5424 0.0093 37.5 -70.9 1.9976 20.7 TRIG_00554635
------------------------------------------
Foreground time interval of the image:
-0.616 8.313 (delta_t = 8.929 [sec])
Background time interval of the image:
-239.288 -0.616 (delta_t = 238.672 [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 -0.616 sec. to 36.808 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61931 ( -0.156327 0.15762 )
Norm@50keV : 4.30356E-03 ( -0.000407848 0.000405382 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.19 using 59 PHA bins.
# Reduced chi-squared = 0.7577 for 57 degrees of freedom
# Null hypothesis probability = 9.117889e-01
Photon flux (15-150 keV) in 37.42 sec: 0.556387 ( -0.0521314 0.0522267 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50265e-06 ( -1.50808e-07 1.51992e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.616 sec. to 36.808 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22930 ( -0.686872 0.500505 )
Epeak [keV] : 93.8458 ( -34.7217 -93.858 )
Norm@50keV : 6.92505E-03 ( -0.00291006 0.00890708 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.94 using 59 PHA bins.
# Reduced chi-squared = 0.7489 for 56 degrees of freedom
# Null hypothesis probability = 9.184862e-01
Photon flux (15-150 keV) in 37.42 sec: 0.547887 ( -0.053743 0.053747 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.45522e-06 ( -1.70066e-07 1.68697e-07 ) ergs/cm2
Band function
Time interval is from -0.616 sec. to 36.808 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.40992 ( -5.35436 -4.40992 )
beta : -1.82967 ( -0.225656 0.206054 )
Epeak [keV] : 28.5879 ( -4.81895 4.32632 )
Norm@50keV : 89.0237 ( -8.01731 1218.63 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.91 using 59 PHA bins.
# Reduced chi-squared = 0.6893 for 55 degrees of freedom
# Null hypothesis probability = 9.617994e-01
Photon flux (15-150 keV) in 37.42 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] : 12.8153 (-1.45127 1.70626)
R^2/D10^2 : 0.107617 (-0.0395963 0.0600864)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.05 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 57 degrees of freedom
# Null hypothesis probability = 1.499894e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.403e-07 2.402e-08
25- 50 4.757e-07 5.332e-08
50-150 4.897e-07 9.862e-08
15-150 1.106e-06 1.308e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 163.479 (-58.4448 -162.857)
Norm : 2.28786 (-0.228253 0.284801)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.85 using 59 PHA bins.
# Reduced chi-squared = 0.7343 for 57 degrees of freedom
# Null hypothesis probability = 9.337556e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.181e-07 2.801e-08
25- 50 4.093e-07 1.627e-07
50-150 8.361e-07 4.543e-07
15-150 1.464e-06 6.379e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.20823 (-1.5506 1.68512)
R1^2/D10^2 : 0.413198 (-0.188944 0.405913)
kT2 [keV] : 34.3903 (-11.0919 37.0344)
R2^2/D10^2 : 2.31763E-03 (-0.00198882 0.00386264)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.80 using 59 PHA bins.
# Reduced chi-squared = 0.6691 for 55 degrees of freedom
# Null hypothesis probability = 9.718960e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.066e-07 7.056e-08
25- 50 4.465e-07 1.418e-07
50-150 8.472e-07 4.261e-07
15-150 1.500e-06 5.392e-07
Peak spectrum fit
Power-law model
Time interval is from 0.972 sec. to 1.972 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42376 ( -0.207099 0.20716 )
Norm@50keV : 2.64130E-02 ( -0.00337919 0.00337315 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.64 using 59 PHA bins.
# Reduced chi-squared = 0.7130 for 57 degrees of freedom
# Null hypothesis probability = 9.500518e-01
Photon flux (15-150 keV) in 1 sec: 3.23440 ( -0.424496 0.425092 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.54013e-07 ( -3.50306e-08 3.51905e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.972 sec. to 1.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18206 ( -0.866065 0.426397 )
Epeak [keV] : 176.294 ( -176.304 -176.304 )
Norm@50keV : 3.49107E-02 ( -0.0155721 0.0566565 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.35 using 59 PHA bins.
# Reduced chi-squared = 0.7206 for 56 degrees of freedom
# Null hypothesis probability = 9.428723e-01
Photon flux (15-150 keV) in 1 sec: 3.21856 ( -0.42754 0.42788 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3289e-07 ( -3.4605e-08 3.5911e-08 ) ergs/cm2
Band function
Time interval is from 0.972 sec. to 1.972 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.72875 ( -4.72875 -4.72875 )
beta : -1.58225 ( -0.278049 0.254589 )
Epeak [keV] : 28.5864 ( -8.46171 6.22443 )
Norm@50keV : 780.001 ( -98.4052 1.21086e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.59 using 59 PHA bins.
# Reduced chi-squared = 0.7016 for 55 degrees of freedom
# Null hypothesis probability = 9.544072e-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] : 16.3965 (-2.65313 3.18419)
R^2/D10^2 : 0.280193 (-0.128448 0.236616)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.53 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 57 degrees of freedom
# Null hypothesis probability = 4.555445e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.549e-08 3.910e-09
25- 50 6.653e-08 1.484e-08
50-150 1.262e-07 3.021e-08
15-150 2.082e-07 3.610e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 13.4630 (-1.71388 1.71375)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.55 using 59 PHA bins.
# Reduced chi-squared = 0.7289 for 57 degrees of freedom
# Null hypothesis probability = 9.381976e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.353e-08 1.883e-08
25- 50 6.449e-08 3.568e-08
50-150 1.415e-07 7.730e-08
15-150 2.395e-07 1.330e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.51996 (-2.27803 3.39536)
R1^2/D10^2 : 2.72664 (-1.85577 6.07477)
kT2 [keV] : 30.3927 (-9.18163 52.4551)
R2^2/D10^2 : 2.59919E-02 (-0.0243257 0.0412792)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.17 using 59 PHA bins.
# Reduced chi-squared = 0.7122 for 55 degrees of freedom
# Null hypothesis probability = 9.472783e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.025e-08 1.688e-08
25- 50 6.468e-08 3.480e-08
50-150 1.589e-07 8.847e-08
15-150 2.538e-07 1.316e-07
Plot creation:
Sun Apr 28 06:19:26 EDT 2013