batgrbproduct Analysis for Trigger=373458
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 Oct 21 12:47:08 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger373458/GCN5_download_cron
======================================================================
Trigger: 00373458 Segment: 000
BAT Trigger Time: 277767409.856 [s; MET]
Trigger Stop: 277767410.88 [s; MET]
UTC: 2009-10-20T21:36:44.667340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 175.715548275446 Dec: 50.9720400823411 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 17.7
Image Trigger?: NO
Rate S/N Ratio: 32.4191301548947 [ if not an image trigger ]
Image S/N Ratio: 17.7
Flight Position: [ source = BAT ]
RA: 175.715548275446 Dec: 50.9720400823411 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 175.726443465137 Dec: 50.9771692830289 [deg; J2000]
{ 11h 42m 54.3s , +50d 58' 37.8" }
+/- 0.761623831225153 [arcmin] (estimated 90% radius based on SNR)
+/- 0.245006400990582 [arcmin] (formal 1-sigma fit error)
SNR: 44.8807894574879
Angular difference between Flight and Ground position is 0.513947 arcmin
Partial Coding Fraction: 0.4335938 [ including projection effects ]
Duration
T90: 39.0079999566078 +/- 4.87503886377992
Measured from: -4.17999988794327
to: 34.8280000686646 [s; relative to TRIGTIME]
T50: 9.57599991559982 +/- 1.19816529243547
Measured from: 1.14800012111664
to: 10.7240000367165 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.14399999380112
to: 2.14399999380112 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.73199999332428
to: 48.3719999790192 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.546052 2.029942 1.729662 0.476450
0.058727 0.063168 0.057825 0.052523 [error]
Peak 0.106413 0.163362 0.178706 0.062436
0.010333 0.011840 0.011522 0.009939 [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 5.37e-07 9.63e-07 1.32e-06 3.77e-06 3.82e-06 6.60e-06 erg/cm2
Error 3.70e-08 3.83e-08 5.98e-08 3.87e-07 1.44e-07 4.22e-07 erg/cm2
Peak flux Power-law 1.09e+00 1.32e+00 1.16e+00 1.76e+00 4.18e+00 5.32e+00 ph/cm2/s
Error 1.53e-01 1.13e-01 9.33e-02 3.03e-01 3.08e-01 3.96e-01 ph/cm2/s
Fluence Cutoff-PL 5.26e-07 9.69e-07 1.33e-06 3.32e-06 3.79e-06 6.14e-06 erg/cm2
Error 4.61e-08 4.17e-08 6.58e-08 7.99e-07 1.56e-07 8.24e-07 erg/cm2
Peak flux Cutoff-PL 1.08e+00 1.32e+00 1.17e+00 1.69e+00 4.17e+00 5.27e+00 ph/cm2/s
Error 1.29e-01 8.82e-02 1.05e-01 5.12e-01 2.34e-01 5.90e-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 1.541 0.067 - - 7.09e-03 2.52e-04 42.650 57
CPL 1.449 0.198 323.4 0.0 7.83e-03 1.71e-03 42.260 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.184 0.124 - - 3.57e-02 2.53e-03 64.520 57
CPL 1.179 0.288 9972.2 0.0 3.59e-02 1.36e-02 64.510 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: 31.872000 sec.
T50 in the 50-300 keV band: 7.680000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 57.104 -8.732 48.372
T90 39.008 -4.180 34.828
T50 9.576 1.148 10.724
Peak 1.000 1.144 2.144
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
175.7264 +50.9772 0.0043 41.1 -148.7 4.5523 44.9 TRIG_00373458
------------------------------------------
Foreground time interval of the image:
-8.732 11.245 (delta_t = 19.977 [sec])
Background time interval of the image:
-239.856 -8.732 (delta_t = 231.124 [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 -8.732 sec. to 48.372 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54079 ( -0.0670373 0.0672077 )
Norm@50keV : 7.09010E-03 ( -0.00025193 0.0002518 )
------------------------------------------------------------
# Chi-Squared = 42.65 using 59 PHA bins.
# Reduced chi-squared = 0.7482 for 57 degrees of freedom
# Null hypothesis probability = 9.211968e-01
Photon flux (15-150 keV) in 57.1 sec: 0.895190 ( -0.0344462 0.0346052 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.81633e-06 ( -1.4425e-07 1.44737e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.732 sec. to 48.372 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44874 ( -0.262292 0.132755 )
Epeak [keV] : 323.424 ( -323.423 -323.423 )
Norm@50keV : 7.82904E-03 ( -0.000951269 0.00247056 )
------------------------------------------------------------
# Chi-Squared = 42.26 using 59 PHA bins.
# Reduced chi-squared = 0.7546 for 56 degrees of freedom
# Null hypothesis probability = 9.128559e-01
Photon flux (15-150 keV) in 57.1 sec: 0.889280 ( -0.039268 0.020058 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.79445e-06 ( -1.67748e-07 1.44886e-07 ) ergs/cm2
Band function
Time interval is from -8.732 sec. to 48.372 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.32606 ( -4.71497 -4.71497 )
beta : -1.54804 ( -0.0697166 0.0676315 )
Epeak [keV] : 20.2576 ( -20.256 5.44397 )
Norm@50keV : 788.729 ( -788.454 11790.9 )
------------------------------------------------------------
# Chi-Squared = 42.21 using 59 PHA bins.
# Reduced chi-squared = 0.7674 for 55 degrees of freedom
# Null hypothesis probability = 8.970425e-01
Photon flux (15-150 keV) in 57.1 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 1.144 sec. to 2.144 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18402 ( -0.125123 0.123669 )
Norm@50keV : 3.56747E-02 ( -0.00252887 0.00252766 )
------------------------------------------------------------
# Chi-Squared = 64.52 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 57 degrees of freedom
# Null hypothesis probability = 2.305328e-01
Photon flux (15-150 keV) in 1 sec: 4.17831 ( -0.307634 0.30828 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.6359e-07 ( -2.81454e-08 2.82809e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.144 sec. to 2.144 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17942 ( -0.428589 0.148336 )
Epeak [keV] : 9972.20 ( )
Norm@50keV : 3.58516E-02 ( -0.00253702 0.0246897 )
------------------------------------------------------------
# Chi-Squared = 64.51 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 56 degrees of freedom
# Null hypothesis probability = 2.035083e-01
Photon flux (15-150 keV) in 1 sec: 4.17244 ( -0.15789 0.30982 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.62606e-07 ( -2.8965e-08 2.8993e-08 ) ergs/cm2
Band function
Time interval is from 1.144 sec. to 2.144 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98232 ( -110.016 -110.016 )
beta : -1.22783 ( -0.142336 0.131496 )
Epeak [keV] : 24.8993 ( -24.8862 5.37436 )
Norm@50keV : 2833.49 ( -2028.47 1673.61 )
------------------------------------------------------------
# Chi-Squared = 62.65 using 59 PHA bins.
# Reduced chi-squared = 1.139 for 55 degrees of freedom
# Null hypothesis probability = 2.234367e-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 Oct 21 13:08:26 EDT 2009