batgrbproduct Analysis for Trigger=358574
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 page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.45
Process Start Time (local time): Wed Jul 29 08:01:18 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger358574/SDC
======================================================================
Trigger: 00358574 Segment: 000
BAT Trigger Time: 270485150.912 [s; MET]
Trigger Stop: 270485155.008 [s; MET]
UTC: 2009-07-28T14:45:45.962500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 29.6601612956258 Dec: 41.6470928113711 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.64
Image Trigger?: NO
Rate S/N Ratio: 10.9544511501033 [ if not an image trigger ]
Image S/N Ratio: 9.64
Flight Position: [ source = BAT ]
RA: 29.6601612956258 Dec: 41.6470928113711 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 29.6437043046911 Dec: 41.6315971679323 [deg; J2000]
{ 01h 58m 34.5s , +41d 37' 53.7" }
+/- 1.87482322122962 [arcmin] (estimated 90% radius based on SNR)
+/- 1.09876400336823 [arcmin] (formal 1-sigma fit error)
SNR: 12.3929603443638
Angular difference between Flight and Ground position is 1.187000 arcmin
Partial Coding Fraction: 0.3789062 [ including projection effects ]
Duration
T90: 59.3359999656677 +/- 17.8473098301119
Measured from: -3.79199999570847
to: 55.5439999699593 [s; relative to TRIGTIME]
T50: 17.9559999704361 +/- 11.7588741077156
Measured from: 1
to: 18.9559999704361 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.25199997425079
to: 2.25199997425079 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.0120000243187
to: 63.1520000100136 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.636478 0.645905 0.395560 0.015753
0.076969 0.076654 0.068449 0.059500 [error]
Peak 0.032833 0.039842 0.033816 0.013158
0.010387 0.010353 0.008946 0.007876 [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 2.32e-07 3.07e-07 2.97e-07 5.13e-07 1.01e-06 1.35e-06 erg/cm2
Error 4.48e-08 4.04e-08 6.76e-08 2.34e-07 1.55e-07 3.06e-07 erg/cm2
Peak flux Power-law 3.68e-01 3.30e-01 2.04e-01 1.91e-01 9.82e-01 1.09e+00 ph/cm2/s
Error 1.64e-01 9.56e-02 7.39e-02 1.38e-01 2.81e-01 3.03e-01 ph/cm2/s
Fluence Cutoff-PL 2.24e-07 3.18e-07 2.99e-07 3.17e-07 9.84e-07 1.16e-06 erg/cm2
Error 5.09e-08 5.05e-08 7.15e-08 3.78e-07 1.65e-07 3.89e-07 erg/cm2
Peak flux Cutoff-PL 2.94e-01 3.70e-01 2.22e-01 6.12e-02 9.32e-01 9.46e-01 ph/cm2/s
Error 2.02e-01 1.21e-01 9.03e-02 1.58e-01 2.95e-01 3.45e-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 2.046 0.256 - - 1.59e-03 2.63e-04 59.710 57
CPL 1.789 0.000 37.0 0.0 2.21e-03 0.00e+00 59.380 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.695 0.477 - - 7.40e-03 2.17e-03 64.890 57
CPL 0.403 2.605 60.3 0.0 3.40e-02 0.00e+00 63.870 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: 7.744000 sec.
T50 in the 50-300 keV band: 4.352000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 68.164 -5.012 63.152
T90 59.336 -3.792 55.544
T50 17.956 1.000 18.956
Peak 1.000 1.252 2.252
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
29.6437 +41.6316 0.0156 46.3 -15.2 1.6392 12.4 TRIG_00358574
------------------------------------------
Foreground time interval of the image:
-5.012 37.789 (delta_t = 42.801 [sec])
Background time interval of the image:
-239.912 -5.012 (delta_t = 234.900 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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 -5.012 sec. to 63.152 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04625 ( -0.245556 0.267048 )
Norm@50keV : 1.59438E-03 ( -0.000267878 0.00025825 )
------------------------------------------------------------
# Chi-Squared = 59.71 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 57 degrees of freedom
# Null hypothesis probability = 3.773442e-01
Photon flux (15-150 keV) in 68.16 sec: 0.244387 ( -0.0324665 0.0325174 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00508e-06 ( -1.53367e-07 1.5623e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.012 sec. to 63.152 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78877 ( )
Epeak [keV] : 36.9598 ( )
Norm@50keV : 2.21329E-03 ( )
------------------------------------------------------------
# Chi-Squared = 59.38 using 59 PHA bins.
# Reduced chi-squared = 1.060 for 56 degrees of freedom
# Null hypothesis probability = 3.536062e-01
Photon flux (15-150 keV) in 68.16 sec: 0.241316 ( -0.033661 0.033595 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.84339e-07 ( -1.63925e-07 1.66515e-07 ) ergs/cm2
Band function
Time interval is from -5.012 sec. to 63.152 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.222659 ( 1.61459 0.957164 )
beta : 10.00000 ( -1.97895e+15 -1.97895e+15 )
Epeak [keV] : 1.42569 ( )
Norm@50keV : 4.51590E-20 ( )
------------------------------------------------------------
# Chi-Squared = 110.24 using 59 PHA bins.
# Reduced chi-squared = 2.0044 for 55 degrees of freedom
# Null hypothesis probability = 1.441568e-05
Photon flux (15-150 keV) in 68.16 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.252 sec. to 2.252 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69546 ( -0.46311 0.491124 )
Norm@50keV : 7.40361E-03 ( -0.00219309 0.00214276 )
------------------------------------------------------------
# Chi-Squared = 64.89 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 57 degrees of freedom
# Null hypothesis probability = 2.209019e-01
Photon flux (15-150 keV) in 1 sec: 0.981733 ( -0.27999 0.281673 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.85737e-08 ( -2.06372e-08 2.10794e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.252 sec. to 2.252 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.402671 ( -3.42682 1.78224 )
Epeak [keV] : 60.2798 ( )
Norm@50keV : 3.40448E-02 ( )
------------------------------------------------------------
# Chi-Squared = 63.87 using 59 PHA bins.
# Reduced chi-squared = 1.141 for 56 degrees of freedom
# Null hypothesis probability = 2.195005e-01
Photon flux (15-150 keV) in 1 sec: 0.932229 ( -0.296215 0.294411 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 1.252 sec. to 2.252 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.401687 ( 0.85658 0.85658 )
beta : -3.08606 ( 3.12069 9.36671 )
Epeak [keV] : 60.2492 ( -60.0742 301.469 )
Norm@50keV : 3.40724E-02 ( -0.0341752 340.769 )
------------------------------------------------------------
# Chi-Squared = 63.83 using 59 PHA bins.
# Reduced chi-squared = 1.161 for 55 degrees of freedom
# Null hypothesis probability = 1.938271e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Wed Jul 29 08:57:03 EDT 2009