batgrbproduct Analysis for Trigger=326115
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): Mon Sep 29 02:56:56 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger326115/GCN5_download_cron
======================================================================
Trigger: 00326115 Segment: 000
BAT Trigger Time: 244306896 [s; MET]
Trigger Stop: 244307008 [s; MET]
UTC: 2008-09-28T15:01:32.866720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 95.0835644412627 Dec: -55.1733396233429 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.92
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.92
Flight Position: [ source = BAT ]
RA: 95.0835644412627 Dec: -55.1733396233429 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 95.0609761115619 Dec: -55.1763381181899 [deg; J2000]
{ 06h 20m 14.6s , -55d 10' 34.8" }
+/- 2.31052895192787 [arcmin] (estimated 90% radius based on SNR)
+/- 1.1631826918956 [arcmin] (formal 1-sigma fit error)
SNR: 9.1945535089047
Angular difference between Flight and Ground position is 0.794611 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 279.000000029802 +/- 29.7658359734072
Measured from: 65.6560000777245
to: 344.656000107527 [s; relative to TRIGTIME]
T50: 46.608000010252 +/- 31.3906428112423
Measured from: 187.828000098467
to: 234.436000108719 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 202.82800000906
to: 203.82800000906 [s; relative to TRIGTIME]
Total Fluence
Measured from: 51.0959999859333
to: 381.548000007868 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.569758 1.674920 1.063967 0.158561
0.089690 0.090249 0.082009 0.077381 [error]
Peak 0.076669 0.096074 0.072949 0.012842
0.005911 0.006022 0.005575 0.004435 [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 4.46e-07 6.96e-07 8.17e-07 1.85e-06 2.50e-06 3.79e-06 erg/cm2
Error 4.52e-08 4.32e-08 8.14e-08 3.88e-07 1.85e-07 4.60e-07 erg/cm2
Peak flux Power-law 7.08e-01 6.92e-01 4.73e-01 5.08e-01 2.08e+00 2.38e+00 ph/cm2/s
Error 8.43e-02 5.07e-02 4.53e-02 9.92e-02 1.47e-01 1.71e-01 ph/cm2/s
Fluence Cutoff-PL 4.46e-07 6.97e-07 8.17e-07 1.84e-06 2.50e-06 3.80e-06 erg/cm2
Error 4.52e-08 4.32e-08 8.15e-08 3.85e-07 1.85e-07 4.56e-07 erg/cm2
Peak flux Cutoff-PL 6.57e-01 7.20e-01 4.87e-01 3.10e-01 2.03e+00 2.18e+00 ph/cm2/s
Error 1.02e-01 6.07e-02 4.99e-02 1.84e-01 1.56e-01 2.50e-01 ph/cm2/s
Fluence Band 4.40e-07 6.99e-07 8.11e-07 1.81e-06 2.49e-06 3.77e-06 erg/cm2
Error 4.99e-08 5.02e-08 8.31e-08 3.46e-07 1.93e-07 7.09e-07 erg/cm2
Peak flux Band 6.55e-01 7.20e-01 4.86e-01 3.49e-01 2.03e+00 2.21e+00 ph/cm2/s
Error 1.03e-01 4.77e-02 5.32e-02 2.48e-01 1.52e-01 2.14e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.769 0.122 - - 8.25e-04 5.85e-05 59.321 57
CPL 1.630 0.000 122.0 0.0 9.79e-04 3.05e-04 59.782 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.549 0.126 - - 1.64e-02 1.22e-03 61.317 57
CPL 1.121 0.521 101.0 4965.9 2.72e-02 1.78e-02 59.172 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: 22.272000 sec.
T50 in the 50-300 keV band: 10.624000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 330.452 51.096 381.548
T90 279.000 65.656 344.656
T50 46.608 187.828 234.436
Peak 1.000 202.828 203.828
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
95.0610 -55.1763 0.0210 13.9 96.1 0.8327 9.2 TRIG_00326115
------------------------------------------
Foreground time interval of the image:
51.096 121.301 (delta_t = 70.205 [sec])
Background time interval of the image:
-239.000 -55.672 (delta_t = 183.328 [sec])
-55.000 51.096 (delta_t = 106.096 [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
Multiple GTIs in the spectrum
tstart tstop
51.096000 322.570000
324.000000 381.548000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76867 ( -0.121214 0.123508 )
Norm@50keV : 8.248217E-04 ( -5.882565E-05 5.808123E-05) )
------------------------------------------------------------
Chi-Squared = 59.32094 using 59 PHA bins.
Reduced chi-squared = 1.040718 for 57 degrees of freedom
Null hypothesis probability = 0.391
Photon flux (15-150 keV) in 329.0 sec: 0.112307 ( -0.007038 0.007048 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.50153e-06 ( -1.83799e-07 1.86148e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
51.096000 322.570000
324.000000 381.548000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63004 ( )
Epeak [keV] : 122.041 ( )
Norm@50keV : 9.791036E-04 ( -8.107256E-05 5.293176E-04) )
------------------------------------------------------------
Chi-Squared = 59.78208 using 59 PHA bins.
Reduced chi-squared = 1.067537 for 56 degrees of freedom
Null hypothesis probability = 0.340
Photon flux (15-150 keV) in 329.0 sec: 0.112260 ( -0.007036 0.007045 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.50133e-06 ( -1.83822e-07 1.86142e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
51.096000 322.570000
324.000000 381.548000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.24314 ( -8.75686 3.65932 )
beta : -1.80361 ( -8.19639 0.147818 )
Epeak [keV] : 40.6896 ( -40.5896 116.842 )
Norm@50keV : 1.923825E-03 ( -24.9357 143.733 )
------------------------------------------------------------
Chi-Squared = 58.97124 using 59 PHA bins.
Reduced chi-squared = 1.072204 for 55 degrees of freedom
Null hypothesis probability = 0.332
Photon flux (15-150 keV) in 329.0 sec: 0.111797 ( -0.007589 0.003768 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.48909e-06 ( -1.97798e-07 1.87803e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 202.828 sec. to 203.828 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54889 ( -0.125317 0.127389 )
Norm@50keV : 1.641185E-02 ( -1.221072E-03 1.212537E-03) )
------------------------------------------------------------
Chi-Squared = 61.31700 using 59 PHA bins.
Reduced chi-squared = 1.075737 for 57 degrees of freedom
Null hypothesis probability = 0.324
Photon flux (15-150 keV) in 1.000 sec: 2.07697 ( -0.14727 0.1474 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54508e-07 ( -1.2569e-08 1.2729e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 202.828 sec. to 203.828 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12101 ( -0.557740 0.484613 )
Epeak [keV] : 100.961 ( -32.7487 9899.04 )
Norm@50keV : 2.715901E-02 ( -1.127081E-02 2.442652E-02) )
------------------------------------------------------------
Chi-Squared = 59.17165 using 59 PHA bins.
Reduced chi-squared = 1.056637 for 56 degrees of freedom
Null hypothesis probability = 0.361
Photon flux (15-150 keV) in 1.000 sec: 2.03361 ( -0.15556 0.15556 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4925e-07 ( -1.4172e-08 1.4081e-08 ) ergs/cm2
Band function
Time interval is from 202.828 sec. to 203.828 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.12264 ( -0.482994 0.559452 )
beta : -8.89208 ( -1.10792 7.40010 )
Epeak [keV] : 101.238 ( -33.0084 9898.76 )
Norm@50keV : 2.709471E-02 ( -1.121055E-02 2.449645E-02) )
------------------------------------------------------------
Chi-Squared = 59.17172 using 59 PHA bins.
Reduced chi-squared = 1.075849 for 55 degrees of freedom
Null hypothesis probability = 0.326
Photon flux (15-150 keV) in 1.000 sec: 2.03239 ( -0.14795 0.15678 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4909e-07 ( -1.4116e-08 1.4072e-08 ) ergs/cm2
Plot creation:
Mon Sep 29 03:16:36 EDT 2008