batgrbproduct Analysis for Trigger=337115
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 v2.42
Process Start Time (local time): Fri Dec 12 01:25:26 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger337115/GCN5_download_cron
======================================================================
Trigger: 00337115 Segment: 000
BAT Trigger Time: 250688894.016 [s; MET]
Trigger Stop: 250688896.064 [s; MET]
UTC: 2008-12-11T11:48:10.690660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 328.087288181771 Dec: -33.8149123552862 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.53
Image Trigger?: NO
Rate S/N Ratio: 7.41619848709566 [ if not an image trigger ]
Image S/N Ratio: 6.53
Flight Position: [ source = BAT ]
RA: 328.087288181771 Dec: -33.8149123552862 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 328.082267774135 Dec: -33.818316721673 [deg; J2000]
{ 21h 52m 19.7s , -33d 49' 05.9" }
+/- 2.31531476043163 [arcmin] (estimated 90% radius based on SNR)
+/- 1.23721480251507 [arcmin] (formal 1-sigma fit error)
SNR: 9.16741503643154
Angular difference between Flight and Ground position is 0.323040 arcmin
Partial Coding Fraction: 0.4257812 [ including projection effects ]
Duration
T90: 3.47200000286102 +/- 0.875598073406745
Measured from: -0.915999919176102
to: 2.55600008368492 [s; relative to TRIGTIME]
T50: 1.55599999427795 +/- 0.905538519079527
Measured from: 0.24000009894371
to: 1.79600009322166 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.19200000166893
to: 1.19200000166893 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.08000001311302
to: 2.74799999594688 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.099893 0.097254 0.041685 0.015732
0.016573 0.016705 0.014522 0.013097 [error]
Peak 0.023015 0.040970 0.027332 -0.000422
0.008404 0.008715 0.007361 0.006749 [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 3.76e-08 4.17e-08 3.29e-08 4.31e-08 1.28e-07 1.55e-07 erg/cm2
Error 9.20e-09 8.78e-09 1.33e-08 3.36e-08 3.10e-08 5.16e-08 erg/cm2
Peak flux Power-law 3.06e-01 2.74e-01 1.69e-01 1.59e-01 8.17e-01 9.08e-01 ph/cm2/s
Error 1.26e-01 7.68e-02 5.88e-02 1.06e-01 2.26e-01 2.47e-01 ph/cm2/s
Fluence Cutoff-PL 3.76e-08 4.33e-08 3.12e-08 2.06e-08 1.23e-07 1.28e-07 erg/cm2
Error 9.50e-09 1.12e-08 1.85e-08 4.16e-08 4.38e-08 6.21e-08 erg/cm2
Peak flux Cutoff-PL 2.57e-01 3.23e-01 1.80e-01 3.96e-02 7.92e-01 7.99e-01 ph/cm2/s
Error 1.38e-01 1.03e-01 7.84e-02 1.07e-01 2.26e-01 2.37e-01 ph/cm2/s
Fluence Band 3.72e-08 4.48e-08 2.75e-08 2.54e-08 1.18e-07 1.38e-07 erg/cm2
Error 1.01e-08 1.03e-08 2.11e-08 3.24e-08 4.87e-08 0.00e+00 erg/cm2
Peak flux Band 2.57e-01 3.24e-01 1.79e-01 3.85e-02 7.91e-01 8.02e-01 ph/cm2/s
Error 1.38e-01 1.03e-01 7.16e-02 1.25e-01 2.26e-01 2.45e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.338 0.407 - - 3.48e-03 1.03e-03 52.372 57
CPL 1.968 1.278 3.1 4999.8 5.94e-03 2.30e-01 52.230 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.697 0.430 - - 6.16e-03 1.76e-03 49.135 57
CPL 0.270 2.133 55.0 4981.9 3.72e-02 6.57e-01 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 3.828 -1.080 2.748
T90 3.472 -0.916 2.556
T50 1.556 0.240 1.796
Peak 1.000 0.192 1.192
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
328.0823 -33.8183 0.0209 42.7 -28.7 0.2797 9.2 TRIG_00337115
------------------------------------------
Foreground time interval of the image:
-1.080 2.748 (delta_t = 3.828 [sec])
Background time interval of the image:
-207.915 -1.080 (delta_t = 206.835 [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 -1.080 sec. to 2.748 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.33773 ( -0.376939 0.437270 )
Norm@50keV : 3.479524E-03 ( -1.049509E-03 1.018254E-03) )
------------------------------------------------------------
Chi-Squared = 52.37183 using 59 PHA bins.
Reduced chi-squared = 0.9188041 for 57 degrees of freedom
Null hypothesis probability = 0.649
Photon flux (15-150 keV) in 3.828 sec: 0.621103 ( -0.11928 0.119282 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.28182e-07 ( -3.01933e-08 3.18287e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.080 sec. to 2.748 sec.
Photon index: 1.96819 ( -2.51641 3.948677E-02) )
Epeak [keV] : 3.14213 ( -2.75447 9996.86 )
Norm@50keV : 5.943983E-03 ( -2.212972E-03 0.458465 )
------------------------------------------------------------
Chi-Squared = 52.22980 using 59 PHA bins.
but latest trial -0.548217 gives Chi-Squared = 64.9727
but latest trial 2.00393 gives Chi-Squared = 2.24457
but latest trial -0.755753 gives Chi-Squared = 8.28896
Reduced chi-squared = 0.9326751 for 56 degrees of freedom
Null hypothesis probability = 0.618
Photon flux (15-150 keV) in 3.828 sec: 0.615063 ( -0.122181 0.120215 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23019e-07 ( -3.61015e-08 5.15704e-08 ) ergs/cm2
Band function
Time interval is from -1.080 sec. to 2.748 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.45090 ( -8.54910 6.45090 )
beta : -2.49210 ( -7.50790 0.481015 )
Epeak [keV] : 18.2446 ( -18.1446 240.124 )
Norm@50keV : 1.437740E-02 ( -0.990194 763.434 )
------------------------------------------------------------
Chi-Squared = 51.67296 using 59 PHA bins.
Reduced chi-squared = 0.9395083 for 55 degrees of freedom
Null hypothesis probability = 0.603
Photon flux (15-150 keV) in 3.828 sec: 0.618185 ( -0.118099 0.121803 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18368e-07 ( -2.97612e-08 3.51008e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.192 sec. to 1.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69704 ( -0.421153 0.438033 )
Norm@50keV : 6.156294E-03 ( -1.769344E-03 1.742785E-03) )
------------------------------------------------------------
Chi-Squared = 49.13470 using 59 PHA bins.
Reduced chi-squared = 0.8620123 for 57 degrees of freedom
Null hypothesis probability = 0.761
Photon flux (15-150 keV) in 1.000 sec: 0.816812 ( -0.225772 0.226798 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.69809e-08 ( -1.66461e-08 1.71029e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.192 sec. to 1.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.270186 ( -2.63658 1.63012 )
Epeak [keV] : 55.0270 ( -18.8734 9944.97 )
Norm@50keV : 3.716909E-02 ( -3.716909E-02 1.27672 )
------------------------------------------------------------
Chi-Squared = 47.05991 using 59 PHA bins.
Reduced chi-squared = 0.8403555 for 56 degrees of freedom
Null hypothesis probability = 0.797
Photon flux (15-150 keV) in 1.000 sec: 0.791530 ( -0.224328 0.22742 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.21065e-08 ( -1.68492e-08 1.80627e-08 ) ergs/cm2
Band function
Time interval is from 0.192 sec. to 1.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.282767 ( -9.71723 2.04430 )
beta : -9.24265 ( -0.757351 19.2426 )
Epeak [keV] : 56.1103 ( -19.9946 9943.89 )
Norm@50keV : 3.571320E-02 ( -134.263 37.2360 )
------------------------------------------------------------
Chi-Squared = 47.06483 using 59 PHA bins.
Reduced chi-squared = 0.8557242 for 55 degrees of freedom
Null hypothesis probability = 0.768
Photon flux (15-150 keV) in 1.000 sec: 0.790628 ( -0.223462 0.228312 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.19383e-08 ( -1.66378e-08 1.8182e-08 ) ergs/cm2
Plot creation:
Fri Dec 12 01:56:45 EST 2008