batgrbproduct Analysis for Trigger=324907
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 v2.41
Process Start Time (local time): Wed Sep 17 01:50:19 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger324907/GCN5_download_cron
======================================================================
Trigger: 00324907 Segment: 000
BAT Trigger Time: 243269090.432 [s; MET]
Trigger Stop: 243269094.528 [s; MET]
UTC: 2008-09-16T14:44:47.329660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 163.624433225854 Dec: 69.0443697041981 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.33
Image Trigger?: NO
Rate S/N Ratio: 8.48528137423857 [ if not an image trigger ]
Image S/N Ratio: 7.33
Flight Position: [ source = BAT ]
RA: 163.624433225854 Dec: 69.0443697041981 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 163.625669525109 Dec: 69.0679422249118 [deg; J2000]
{ 10h 54m 30.2s , +69d 04' 04.6" }
+/- 2.04543027534442 [arcmin] (estimated 90% radius based on SNR)
+/- 0.857014609142525 [arcmin] (formal 1-sigma fit error)
SNR: 10.9430974302161
Angular difference between Flight and Ground position is 1.414600 arcmin
Partial Coding Fraction: 0.53125 [ including projection effects ]
Duration
T90: 33.4079999923706 +/- 7.33109105996622
Measured from: -0.919999927282333
to: 32.4880000650883 [s; relative to TRIGTIME]
T50: 12.6399999856949 +/- 6.96388397299989
Measured from: 2.55200007557869
to: 15.1920000612736 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.29199999570847
to: 4.29199999570847 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.58400002121925
to: 35.7360000014305 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.259200 0.365165 0.260945 0.038233
0.041055 0.041675 0.038787 0.038415 [error]
Peak 0.013158 0.027528 0.025072 0.002876
0.006848 0.007133 0.006700 0.006402 [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 8.46e-08 1.53e-07 2.13e-07 6.22e-07 6.13e-07 1.07e-06 erg/cm2
Error 1.77e-08 2.01e-08 3.85e-08 2.38e-07 9.24e-08 2.70e-07 erg/cm2
Peak flux Power-law 1.53e-01 1.78e-01 1.48e-01 2.09e-01 5.54e-01 6.88e-01 ph/cm2/s
Error 7.55e-02 5.90e-02 5.14e-02 1.41e-01 1.70e-01 2.19e-01 ph/cm2/s
Fluence Cutoff-PL 7.75e-08 1.65e-07 2.17e-07 2.32e-07 5.75e-07 7.14e-07 erg/cm2
Error 2.12e-08 2.74e-08 4.26e-08 3.61e-07 1.09e-07 4.01e-07 erg/cm2
Peak flux Cutoff-PL 7.80e-02 2.41e-01 1.87e-01 1.87e-02 5.23e-01 5.24e-01 ph/cm2/s
Error 3.68e-02 7.71e-02 6.60e-02 2.63e-02 1.38e-01 1.37e-01 ph/cm2/s
Fluence Band 7.49e-08 1.67e-07 2.11e-07 4.01e-07 5.82e-07 8.58e-07 erg/cm2
Error 1.57e-08 2.79e-08 4.18e-08 3.82e-07 8.92e-08 3.68e-07 erg/cm2
Peak flux Band 5.48e-02 2.55e-01 1.77e-01 7.56e-03 4.93e-01 4.93e-01 ph/cm2/s
Error 2.59e-02 6.86e-02 4.61e-02 2.72e-02 1.28e-01 1.39e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.522 0.228 - - 1.69e-03 2.30e-04 56.149 57
CPL 0.874 1.076 81.4 5000.0 3.74e-03 9.39e-03 54.965 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.255 0.453 - - 4.68e-03 1.42e-03 68.078 57
CPL -2.500 0.000 60.3 11.0 3.34e-01 6.35e-01 57.649 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: 9.472000 sec.
T50 in the 50-300 keV band: 4.992000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 38.320 -2.584 35.736
T90 33.408 -0.920 32.488
T50 12.640 2.552 15.192
Peak 1.000 3.292 4.292
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
163.6257 +69.0679 0.0175 30.0 -58.9 0.9532 10.9 TRIG_00324907
------------------------------------------
Foreground time interval of the image:
-2.584 35.736 (delta_t = 38.320 [sec])
Background time interval of the image:
-215.031 -2.584 (delta_t = 212.447 [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 -2.584 sec. to 35.736 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52191 ( -0.225393 0.229700 )
Norm@50keV : 1.693434E-03 ( -2.311658E-04 2.283477E-04) )
------------------------------------------------------------
Chi-Squared = 56.14852 using 59 PHA bins.
Reduced chi-squared = 0.9850618 for 57 degrees of freedom
Null hypothesis probability = 0.507
Photon flux (15-150 keV) in 38.32 sec: 0.212677 ( -0.027418 0.027441 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.13323e-07 ( -9.13625e-08 9.34433e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.584 sec. to 35.736 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.873906 ( -1.33414 0.818085 )
Epeak [keV] : 81.4154 ( -81.4054 9918.58 )
Norm@50keV : 3.736698E-03 ( -3.736698E-03 1.504472E-02) )
------------------------------------------------------------
Chi-Squared = 54.96539 using 59 PHA bins.
Reduced chi-squared = 0.9815248 for 56 degrees of freedom
Null hypothesis probability = 0.514
Photon flux (15-150 keV) in 38.32 sec: 0.206308 ( -0.029537 0.029145 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.74819e-07 ( -1.08009e-07 1.10419e-07 ) ergs/cm2
Band function
Time interval is from -2.584 sec. to 35.736 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.857308 ( -9.14269 1.92056 )
beta : -1.85528 ( -8.14472 0.479234 )
Epeak [keV] : 75.8464 ( -75.7464 399.584 )
Norm@50keV : 3.918975E-03 ( -3.918975E-03 214.433 )
------------------------------------------------------------
Chi-Squared = 54.57097 using 59 PHA bins.
Reduced chi-squared = 0.9921995 for 55 degrees of freedom
Null hypothesis probability = 0.491
Photon flux (15-150 keV) in 38.32 sec: 0.206438 ( -0.028635 0.028039 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.8187e-07 ( -7.97171e-08 9.86817e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 3.288 sec. to 4.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25536 ( -0.452016 0.453715 )
Norm@50keV : 4.678570E-03 ( -1.426727E-03 1.421854E-03) )
------------------------------------------------------------
Chi-Squared = 68.07776 using 59 PHA bins.
Reduced chi-squared = 1.194347 for 57 degrees of freedom
Null hypothesis probability = 0.150
Photon flux (15-150 keV) in 1.008 sec: 0.553938 ( -0.169329 0.170964 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.7053e-08 ( -1.53282e-08 1.58769e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.288 sec. to 4.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49989 ( )
Epeak [keV] : 60.3337 ( -9.62806 12.3552 )
Norm@50keV : 0.334306 ( -0.574576 0.695261 )
------------------------------------------------------------
Chi-Squared = 57.64946 using 59 PHA bins.
Reduced chi-squared = 1.029455 for 56 degrees of freedom
Null hypothesis probability = 0.414
Photon flux (15-150 keV) in 1.008 sec: 0.523176 ( -0.137478 0.138008 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.06069e-08 ( -1.14046e-08 1.22734e-08 ) ergs/cm2
Band function
Time interval is from 3.288 sec. to 4.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.50679 ( -3.32823 4.368973E-02) )
beta : -9.14661 ( -2.002716E-05 1.47582 )
Epeak [keV] : 66.3913 ( -8.15257 9.32112 )
Norm@50keV : 0.102211 ( -2.99696 8.10258 )
------------------------------------------------------------
Chi-Squared = 59.32836 using 59 PHA bins.
Reduced chi-squared = 1.078697 for 55 degrees of freedom
Null hypothesis probability = 0.321
Photon flux (15-150 keV) in 1.008 sec: 0.493450 ( -0.128747 0.126774 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.84817e-08 ( -1.07717e-08 1.37565e-08 ) ergs/cm2
Plot creation:
Wed Sep 17 02:13:28 EDT 2008