batgrbproduct Analysis for Trigger=554491
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): Fri Apr 26 10:45:20 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger554491/GCN5_download_cron
======================================================================
Trigger: 00554491 Segment: 000
BAT Trigger Time: 388610135.528 [s; MET]
Trigger Stop: 388610135.56 [s; MET]
UTC: 2013-04-25T19:15:25.045440 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 266.41236794158 Dec: -28.9896826742846 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.09
Image Trigger?: NO
Rate S/N Ratio: 14.247806848775 [ if not an image trigger ]
Image S/N Ratio: 8.09
Flight Position: [ source = BAT ]
RA: 266.41236794158 Dec: -28.9896826742846 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 266.353491520349 Dec: -29.0180556478315 [deg; J2000]
{ 17h 45m 24.8s , -29d 01' 05.0" }
+/- 2.42434295794999 [arcmin] (estimated 90% radius based on SNR)
+/- 1.58220347438303 [arcmin] (formal 1-sigma fit error)
SNR: 8.58416977848527
Angular difference between Flight and Ground position is 3.527525 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 0.0279999375343323 +/- 0.00894429003608426
Measured from: 1.19209289550781e-07
to: 0.0280000567436218 [s; relative to TRIGTIME]
T50: 0.015999972820282 +/- 0.00894429003608426
Measured from: 0.00400012731552124
to: 0.0200001001358032 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.48199999332428
to: 0.51800000667572 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0320000052452087 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.005540 0.012242 0.006500 -0.000761
0.001681 0.001892 0.001379 0.000974 [error]
Peak 0.006311 0.014869 0.008474 -0.005461
0.006798 0.006395 0.005514 0.004959 [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 2.20e-09 1.68e-09 8.58e-10 6.29e-10 5.03e-09 5.37e-09 erg/cm2
Error 6.80e-10 4.42e-10 3.15e-10 3.86e-10 1.32e-09 1.43e-09 erg/cm2
Peak flux Power-law 1.04e-01 9.22e-02 5.60e-02 5.16e-02 2.74e-01 3.04e-01 ph/cm2/s
Error 8.58e-02 7.09e-02 4.96e-02 8.78e-02 1.47e-01 1.65e-01 ph/cm2/s
Fluence Cutoff-PL 3.97e-10 5.42e-09 2.77e-09 6.74e-12 8.59e-09 8.59e-09 erg/cm2
Error 5.50e-10 1.22e-09 8.96e-10 1.42e-11 1.73e-09 1.73e-09 erg/cm2
Peak flux Cutoff-PL 9.65e-03 1.15e-01 5.69e-02 1.62e-04 1.81e-01 1.81e-01 ph/cm2/s
Error 4.93e-02 6.89e-02 6.05e-02 6.96e-02 1.41e-01 1.61e-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 8.87e-02 6.10e-02 1.02e-01 2.77e-01 0.00e+00 0.00e+00 ph/cm2/s
Error 2.31e-01 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 2.970 0.348 - - 1.33e-02 4.07e-03 80.310 57
CPL -8.475 0.000 44.5 3.5 1.02e+04 0.00e+00 53.020 56
The chi2 of BB fit is 60.10 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 1.718 1.328 - - 2.05e-03 1.63e-03 48.570 57
CPL -9.945 0.000 48.7 146.7 9.25e+02 5.46e+03 47.060 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 0.032 0.000 0.032
T90 0.028 0.000 0.028
T50 0.016 0.004 0.020
Peak 1.000 -0.482 0.518
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
266.3535 -29.0181 0.0224 0.1 25.4 0.0229 8.6 TRIG_00554491
------------------------------------------
Foreground time interval of the image:
0.000 0.032 (delta_t = 0.032 [sec])
Background time interval of the image:
-98.227 0.000 (delta_t = 98.227 [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 0.000 sec. to 0.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.97003 ( -0.322609 0.37401 )
Norm@50keV : 1.32669E-02 ( -0.00414245 0.00399033 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.31 using 59 PHA bins.
# Reduced chi-squared = 1.409 for 57 degrees of freedom
# Null hypothesis probability = 2.267614e-02
Photon flux (15-150 keV) in 0.032 sec: 3.57020 ( -0.979068 0.978525 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.03181e-09 ( -1.31614e-09 1.31612e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -8.47545 ( )
Epeak [keV] : 44.4990 ( -3.41724 3.63595 )
Norm@50keV : 1.01681E+04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.02 using 59 PHA bins.
# Reduced chi-squared = 0.9468 for 56 degrees of freedom
# Null hypothesis probability = 5.883447e-01
Photon flux (15-150 keV) in 0.032 sec: 4.08462 ( -0.90199 1.1173 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.58976e-09 ( -1.73555e-09 1.7344e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -1.98414 -5 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 41.5336 ( -3.08477 2.35453 )
Norm@50keV : 280.182 ( -57.3362 210.759 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.67 using 59 PHA bins.
# Reduced chi-squared = 0.9939 for 55 degrees of freedom
# Null hypothesis probability = 4.873389e-01
Photon flux (15-150 keV) in 0.032 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] : 9.22704 (-0.82839 0.800396)
R^2/D10^2 : 3.52069 (-1.31663 1.8734)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.10 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 57 degrees of freedom
# Null hypothesis probability = 3.642810e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.891e-09 5.386e-10
25- 50 4.176e-09 1.003e-09
50-150 1.719e-09 4.923e-10
15-150 7.786e-09 1.814e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 27.1603 (-5.56381 6.87912)
Norm : 38.2970 (-12.7731 15.3536)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.36 using 59 PHA bins.
# Reduced chi-squared = 1.269 for 57 degrees of freedom
# Null hypothesis probability = 8.265920e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.362e-09 6.786e-10
25- 50 2.549e-09 6.136e-10
50-150 1.220e-09 4.728e-10
15-150 6.131e-09 1.565e-09
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.928709 (-1.21586 6.71937)
R1^2/D10^2 : 5.24238E+06 ( )
kT2 [keV] : 9.31881 (-0.843205 0.838393)
R2^2/D10^2 : 3.26825 (-1.29474 1.53985)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.98 using 59 PHA bins.
#Fit statistic : Chi-Squared = 58.85 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 55 degrees of freedom
# Reduced chi-squared = 1.070 for 55 degrees of freedom
# Null hypothesis probability = 3.320615e-01
# Null hypothesis probability = 3.364865e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.976e-09 6.786e-10
25- 50 4.013e-09 1.224e-09
50-150 1.708e-09 6.392e-10
15-150 7.698e-09 2.080e-09
Peak spectrum fit
Power-law model
Time interval is from -0.482 sec. to 0.518 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71758 ( -0.979174 1.67586 )
Norm@50keV : 2.05263E-03 ( -0.00205263 0.00120037 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.57 using 59 PHA bins.
# Reduced chi-squared = 0.8520 for 57 degrees of freedom
# Null hypothesis probability = 7.791441e-01
Photon flux (15-150 keV) in 1 sec: 0.274307 ( -0.147052 0.147605 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.898e-08 ( -1.17501e-08 1.23584e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.482 sec. to 0.518 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.94478 ( )
Epeak [keV] : 48.7025 ( -9.53336 283.785 )
Norm@50keV : 925.182 ( -954.878 9974.67 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.06 using 59 PHA bins.
# Reduced chi-squared = 0.8404 for 56 degrees of freedom
# Null hypothesis probability = 7.967385e-01
Photon flux (15-150 keV) in 1 sec: 0.181485 ( -0.0905449 0.190918 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.61523e-08 ( -5.9495e-09 1.36376e-08 ) ergs/cm2
Band function
Time interval is from -0.482 sec. to 0.518 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -9.37167 ( 9.37167 19.3599 )
Epeak [keV] : 53.2586 ( -15.2445 21.6168 )
Norm@50keV : 2.72169 ( -1.38821 4.9952e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.62 using 59 PHA bins.
# Reduced chi-squared = 0.8657 for 55 degrees of freedom
# Null hypothesis probability = 7.498297e-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] : 14.5885 (-5.62734 11.0003)
R^2/D10^2 : 3.59405E-02 (-0.0359396 0.158282)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.87 using 59 PHA bins.
# Reduced chi-squared = 0.8399 for 57 degrees of freedom
# Null hypothesis probability = 8.000637e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.608e-09 1.092e-09
25- 50 6.225e-09 4.066e-09
50-150 8.903e-09 7.030e-09
15-150 1.674e-08 1.220e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 1.47776 ( )
Norm : 4.43880E+04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.59 using 59 PHA bins.
# Reduced chi-squared = 0.8700 for 57 degrees of freedom
# Null hypothesis probability = 7.465230e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.549e-09 1.327e-09
25- 50 1.177e-11 6.235e-12
50-150 2.137e-17 1.751e-17
15-150 2.561e-09 1.314e-09
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.01351 (-1.14359 0.895302)
R1^2/D10^2 : 5.09679E+05 ( )
kT2 [keV] : 16.1793 (-6.173 14.3321)
R2^2/D10^2 : 2.31394E-02 (-0.020814 0.0971701)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.28 using 59 PHA bins.
#Fit statistic : Chi-Squared = 41.11 using 59 PHA bins.
# Reduced chi-squared = 0.7505 for 55 degrees of freedom
# Reduced chi-squared = 0.7474 for 55 degrees of freedom
# Null hypothesis probability = 9.148590e-01
# Null hypothesis probability = 9.178686e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.176e-09 1.200e-09
25- 50 5.192e-09 3.583e-09
50-150 9.827e-09 7.560e-09
15-150 1.819e-08 1.195e-08
Plot creation:
Fri Apr 26 11:03:58 EDT 2013