batgrbproduct Analysis for Trigger=339852
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): Wed Jan 14 08:35:44 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger339852/GCN5_download_cron
======================================================================
Trigger: 00339852 Segment: 000
BAT Trigger Time: 253564843.584 [s; MET]
Trigger Stop: 253564843.712 [s; MET]
UTC: 2009-01-13T18:40:39.170560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 32.0733788955683 Dec: 33.4564341321039 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.58
Image Trigger?: NO
Rate S/N Ratio: 8.83176086632785 [ if not an image trigger ]
Image S/N Ratio: 7.58
Flight Position: [ source = BAT ]
RA: 32.0733788955683 Dec: 33.4564341321039 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 32.0668560938994 Dec: 33.4358496879823 [deg; J2000]
{ 02h 08m 16.0s , +33d 26' 09.1" }
+/- 0.98346586285416 [arcmin] (estimated 90% radius based on SNR)
+/- 0.23626346305319 [arcmin] (formal 1-sigma fit error)
SNR: 31.1503013101756
Angular difference between Flight and Ground position is 1.277510 arcmin
Partial Coding Fraction: 0.8125 [ including projection effects ]
Duration
T90: 9.09600001573563 +/- 0.900222182982103
Measured from: -0.1039999127388
to: 8.99200010299683 [s; relative to TRIGTIME]
T50: 5.88800001144409 +/- 0.619935483482905
Measured from: 1.62000009417534
to: 7.50800010561943 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.45600000023842
to: 2.45600000023842 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.919999986886978
to: 9.95200002193451 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.354588 0.468059 0.326277 0.100205
0.020286 0.020935 0.018939 0.015998 [error]
Peak 0.068251 0.108913 0.101713 0.029950
0.006623 0.007353 0.007161 0.005627 [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 1.13e-07 1.95e-07 2.58e-07 6.96e-07 7.55e-07 1.26e-06 erg/cm2
Error 1.05e-08 1.07e-08 1.87e-08 1.10e-07 4.43e-08 1.24e-07 erg/cm2
Peak flux Power-law 6.49e-01 7.87e-01 6.90e-01 1.04e+00 2.49e+00 3.17e+00 ph/cm2/s
Error 8.95e-02 6.54e-02 5.67e-02 1.84e-01 1.80e-01 2.39e-01 ph/cm2/s
Fluence Cutoff-PL 1.12e-07 1.97e-07 2.59e-07 6.41e-07 7.52e-07 1.15e-06 erg/cm2
Error 1.08e-08 1.20e-08 1.94e-08 2.18e-07 4.80e-08 2.32e-07 erg/cm2
Peak flux Cutoff-PL 6.28e-01 7.94e-01 7.00e-01 9.06e-01 2.48e+00 3.01e+00 ph/cm2/s
Error 1.09e-01 7.31e-02 6.72e-02 3.45e-01 1.87e-01 3.58e-01 ph/cm2/s
Fluence Band 1.08e-07 1.99e-07 2.57e-07 6.56e-07 7.48e-07 1.22e-06 erg/cm2
Error 1.29e-08 1.44e-08 1.85e-08 2.09e-07 4.81e-08 1.85e-07 erg/cm2
Peak flux Band 6.08e-01 8.08e-01 7.01e-01 9.38e-01 2.46e+00 3.07e+00 ph/cm2/s
Error 1.22e-01 8.00e-02 4.75e-02 3.00e-01 1.90e-01 3.67e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.597 0.098 - - 7.42e-03 4.02e-04 44.839 57
CPL 1.537 0.260 385.5 5000.0 7.96e-03 2.47e-03 44.842 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.189 0.125 - - 2.12e-02 1.50e-03 54.556 57
CPL 1.069 0.391 427.4 5000.0 2.42e-02 1.15e-02 54.382 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: 8.640000 sec.
T50 in the 50-300 keV band: 4.032000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 10.872 -0.920 9.952
T90 9.096 -0.104 8.992
T50 5.888 1.620 7.508
Peak 1.000 1.456 2.456
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
32.0669 +33.4358 0.0062 30.7 -10.4 1.1926 31.2 TRIG_00339852
------------------------------------------
Foreground time interval of the image:
-0.920 8.617 (delta_t = 9.537 [sec])
Background time interval of the image:
-63.083 -0.920 (delta_t = 62.163 [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 -0.920 sec. to 9.952 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59737 ( -9.748709E-02 9.840202E-02) )
Norm@50keV : 7.423455E-03 ( -4.033544E-04 4.014452E-04) )
------------------------------------------------------------
Chi-Squared = 44.83939 using 59 PHA bins.
Reduced chi-squared = 0.7866559 for 57 degrees of freedom
Null hypothesis probability = 0.879
Photon flux (15-150 keV) in 10.87 sec: 0.953172 ( -0.051673 0.051808 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.54969e-07 ( -4.42083e-08 4.43366e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.920 sec. to 9.952 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53709 ( -0.362040 0.157333 )
Epeak [keV] : 385.484 ( -385.474 9614.52 )
Norm@50keV : 7.956162E-03 ( -9.206161E-04 4.022867E-03) )
------------------------------------------------------------
Chi-Squared = 44.84194 using 59 PHA bins.
Reduced chi-squared = 0.8007489 for 56 degrees of freedom
Null hypothesis probability = 0.858
Photon flux (15-150 keV) in 10.87 sec: 0.950151 ( -0.027097 0.054349 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.52074e-07 ( -4.87291e-08 4.72649e-08 ) ergs/cm2
Band function
Time interval is from -0.920 sec. to 9.952 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13809 ( -8.86191 3.66120 )
beta : -1.64669 ( -8.35331 0.141019 )
Epeak [keV] : 64.9048 ( -64.8048 9935.09 )
Norm@50keV : 1.430408E-02 ( -1.430408E-02 8791.34 )
------------------------------------------------------------
Chi-Squared = 44.52580 using 59 PHA bins.
Reduced chi-squared = 0.8095600 for 55 degrees of freedom
Null hypothesis probability = 0.843
Photon flux (15-150 keV) in 10.87 sec: 0.944668 ( -0.056173 0.056312 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.47817e-07 ( -4.81487e-08 4.80063e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.456 sec. to 2.456 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18863 ( -0.125281 0.124775 )
Norm@50keV : 2.124329E-02 ( -1.496768E-03 1.496769E-03) )
------------------------------------------------------------
Chi-Squared = 54.55573 using 59 PHA bins.
Reduced chi-squared = 0.9571180 for 57 degrees of freedom
Null hypothesis probability = 0.567
Photon flux (15-150 keV) in 1.000 sec: 2.48964 ( -0.18028 0.18048 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.162e-07 ( -1.702e-08 1.7143e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.456 sec. to 2.456 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06855 ( -0.544807 0.237371 )
Epeak [keV] : 427.436 ( -427.426 9572.56 )
Norm@50keV : 2.418206E-02 ( -4.293161E-03 1.867704E-02) )
------------------------------------------------------------
Chi-Squared = 54.38225 using 59 PHA bins.
Reduced chi-squared = 0.9711116 for 56 degrees of freedom
Null hypothesis probability = 0.536
Photon flux (15-150 keV) in 1.000 sec: 2.47684 ( -0.18681 0.18639 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14803e-07 ( -1.8553e-08 1.7345e-08 ) ergs/cm2
Band function
Time interval is from 1.456 sec. to 2.456 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.947851 ( -9.05215 5.94569 )
beta : -1.18869 ( -8.68067 0.238355 )
Epeak [keV] : 51.0925 ( -138.622 9861.28 )
Norm@50keV : 3.835320E-02 ( -1.470531E-02 7927.59 )
------------------------------------------------------------
Chi-Squared = 54.55574 using 59 PHA bins.
Reduced chi-squared = 0.9919226 for 55 degrees of freedom
Null hypothesis probability = 0.492
Photon flux (15-150 keV) in 1.000 sec: 2.45957 ( -0.19091 0.18919 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14713e-07 ( -1.8275e-08 1.7972e-08 ) ergs/cm2
Plot creation:
Wed Jan 14 09:11:39 EST 2009