batgrbproduct Analysis for Trigger=347974
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): Mon Mar 30 19:51:18 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger347974/GCN5_download_cron
======================================================================
Trigger: 00347974 Segment: 000
BAT Trigger Time: 260087455.732 [s; MET]
Trigger Stop: 260087455.796 [s; MET]
UTC: 2009-03-30T06:30:51.115380 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 91.4389151457237 Dec: -21.9852143348414 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.75
Image Trigger?: NO
Rate S/N Ratio: 11.4455231422596 [ if not an image trigger ]
Image S/N Ratio: 5.75
Flight Position: [ source = BAT ]
RA: 91.4389151457237 Dec: -21.9852143348414 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 91.4629226037087 Dec: -21.9045441659935 [deg; J2000]
{ 06h 05m 51.1s , -21d 54' 16.4" }
+/- 5.69992042842486 [arcmin] (estimated 90% radius based on SNR)
+/- 4.48256831093777 [arcmin] (formal 1-sigma fit error)
SNR: 2.53107968841635
Angular difference between Flight and Ground position is 5.021229 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
T50: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0640000104904175 second)
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.000170 -0.001291 0.005360 0.004767
0.001327 0.001208 0.001353 0.001551 [error]
Peak 0.000170 -0.001291 0.005360 0.004767
0.001327 0.001208 0.001353 0.001551 [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 4.27e-11 1.39e-10 3.72e-10 2.90e-09 1.01e-09 3.45e-09 erg/cm2
Error 1.57e-10 2.78e-10 4.33e-10 7.14e-09 1.19e-09 7.32e-09 erg/cm2
Peak flux Power-law 2.12e-02 3.70e-02 4.94e-02 1.35e-01 1.44e-01 2.43e-01 ph/cm2/s
Error 7.94e-02 7.66e-02 5.91e-02 2.68e-01 2.31e-01 2.75e-01 ph/cm2/s
Fluence Cutoff-PL 3.26e-11 3.12e-10 1.15e-09 1.02e-09 2.21e-09 2.51e-09 erg/cm2
Error 6.63e-11 3.66e-10 1.05e-09 1.61e-09 1.66e-09 2.13e-09 erg/cm2
Peak flux Cutoff-PL 1.46e-02 7.55e-02 1.52e-01 7.56e-02 3.01e-01 3.16e-01 ph/cm2/s
Error 3.22e-02 9.37e-02 1.43e-01 5.51e-02 2.91e-01 2.99e-01 ph/cm2/s
Fluence Band 2.70e-11 3.73e-10 1.71e-09 9.36e-10 2.69e-09 2.29e-09 erg/cm2
Error 3.15e-10 9.54e-10 1.72e-09 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 9.84e-03 4.67e-02 1.40e-01 8.26e-02 2.95e-01 2.65e-01 ph/cm2/s
Error 1.71e-01 2.35e-01 2.38e-01 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 0.590 6.500 - - 1.24e-03 1.89e-03 69.786 57
CPL -2.500 0.000 109.6 83.0 2.02e-02 9.83e-02 67.359 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.590 6.500 - - 1.24e-03 1.89e-03 69.786 57
CPL -2.500 0.000 109.6 83.0 2.02e-02 9.83e-02 67.359 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 0.064 0.000 0.064
T90 0.064 0.000 0.064
T50 0.064 0.000 0.064
Peak 0.064 0.000 0.064
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
91.4629 -21.9045 0.0759 20.0 3.3 0.0068 2.5 TRIG_00347974
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.732 -7.732 (delta_t = 53.000 [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 0.000 sec. to 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.590047 ( -3.59005 9.40995 )
Norm@50keV : 1.236751E-03 ( -1.236751E-03 2.546525E-03) )
------------------------------------------------------------
Chi-Squared = 69.78582 using 59 PHA bins.
Reduced chi-squared = 1.224313 for 57 degrees of freedom
Null hypothesis probability = 0.119
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.144053 ( -0.144053 0.318373 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01474e-09 ( -1.01474e-09 1.36535e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.50000 ( )
Epeak [keV] : 109.617 ( -93.4570 72.5861 )
Norm@50keV : 2.019804E-02 ( -5.663573E-02 0.139866 )
------------------------------------------------------------
Chi-Squared = 67.35934 using 59 PHA bins.
Reduced chi-squared = 1.202845 for 56 degrees of freedom
Null hypothesis probability = 0.142
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.301339 ( -0.301339 0.281289 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20736e-09 ( -1.62666e-09 1.6929e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.03696 ( -14.9932 6.765366E-03) )
beta : -9.31701 ( )
Epeak [keV] : 109.533 ( )
Norm@50keV : 2.706118E-02 ( )
------------------------------------------------------------
Chi-Squared = 66.79278 using 59 PHA bins.
Reduced chi-squared = 1.214414 for 55 degrees of freedom
Null hypothesis probability = 0.132
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.295243 ( -0.295243 0.181029 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.69266e-09 ( -1.6375e-09 1.80527e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.590047 ( -3.59005 9.40995 )
Norm@50keV : 1.236751E-03 ( -1.236751E-03 2.546525E-03) )
------------------------------------------------------------
Chi-Squared = 69.78582 using 59 PHA bins.
Reduced chi-squared = 1.224313 for 57 degrees of freedom
Null hypothesis probability = 0.119
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.144053 ( -0.144053 0.318373 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01474e-09 ( -1.01474e-09 1.36535e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.50000 ( )
Epeak [keV] : 109.617 ( -93.4570 72.5861 )
Norm@50keV : 2.019804E-02 ( -5.663573E-02 0.139866 )
------------------------------------------------------------
Chi-Squared = 67.35934 using 59 PHA bins.
Reduced chi-squared = 1.202845 for 56 degrees of freedom
Null hypothesis probability = 0.142
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.301339 ( -0.301339 0.281289 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20736e-09 ( -1.62666e-09 1.6929e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.03696 ( -14.9932 6.765366E-03) )
beta : -9.31701 ( )
Epeak [keV] : 109.533 ( )
Norm@50keV : 2.706118E-02 ( )
------------------------------------------------------------
Chi-Squared = 66.79278 using 59 PHA bins.
Reduced chi-squared = 1.214414 for 55 degrees of freedom
Null hypothesis probability = 0.132
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.295243 ( -0.295243 0.181029 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.69266e-09 ( -1.6375e-09 1.80527e-09 ) ergs/cm2
Plot creation:
Mon Mar 30 20:20:07 EDT 2009