batgrbproduct Analysis for Trigger=347954
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 03:37:22 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger347954/GCN5_download_cron
======================================================================
Trigger: 00347954 Segment: 000
BAT Trigger Time: 260063459.668 [s; MET]
Trigger Stop: 260063459.732 [s; MET]
UTC: 2009-03-29T23:50:55.052140 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 353.727280820949 Dec: 39.0480298950609 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.64
Image Trigger?: NO
Rate S/N Ratio: 9.2736184954957 [ if not an image trigger ]
Image S/N Ratio: 5.64
Flight Position: [ source = BAT ]
RA: 353.727280820949 Dec: 39.0480298950609 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 353.801170787262 Dec: 38.9026175975459 [deg; J2000]
{ 23h 35m 12.3s , +38d 54' 09.4" }
+/- 5.05111403624662 [arcmin] (estimated 90% radius based on SNR)
+/- 4.16536743999238 [arcmin] (formal 1-sigma fit error)
SNR: 3.00801197433583
Angular difference between Flight and Ground position is 9.380835 arcmin
Partial Coding Fraction: 0.2050781 [ including projection effects ]
Duration
T90: 0.0639999806880951 +/-
Measured from: 0
to: 0.0639999806880951 [s; relative to TRIGTIME]
T50: 0.0639999806880951 +/-
Measured from: 0
to: 0.0639999806880951 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0639999806880951 second)
Measured from: -1.49011611938477e-08
to: 0.0639999657869339 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0639999806880951 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.001371 -0.007837 0.005278 0.014584
0.002864 0.003264 0.003498 0.003484 [error]
Peak -0.001371 -0.007837 0.005278 0.014584
0.002864 0.003264 0.003498 0.003484 [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-12 1.16e-11 3.89e-11 4.46e-10 1.11e-10 1.32e-10 erg/cm2
Error 4.91e-11 1.23e-10 6.97e-09 4.66e-10 7.11e-09 0.00e+00 erg/cm2
Peak flux Power-law 1.61e-03 2.98e-03 5.09e-03 1.96e-02 1.40e-02 2.11e-02 ph/cm2/s
Error 2.56e-01 1.57e-02 1.56e-02 2.66e-01 4.52e-02 2.82e-01 ph/cm2/s
Fluence Cutoff-PL 1.04e-12 1.20e-11 6.48e-11 1.22e-10 1.43e-10 1.74e-10 erg/cm2
Error 5.20e-10 6.41e-11 1.70e-10 9.71e-09 3.65e-10 8.16e-09 erg/cm2
Peak flux Cutoff-PL 4.82e-04 2.99e-03 8.54e-03 8.29e-03 1.73e-02 2.00e-02 ph/cm2/s
Error 2.91e-01 2.16e-02 2.13e-02 5.60e-01 2.18e-01 3.09e-01 ph/cm2/s
Fluence Band 9.23e-13 1.15e-11 9.59e-11 1.40e-10 2.03e-10 9.41e-11 erg/cm2
Error 2.81e-11 2.24e-10 5.96e-09 7.04e-10 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 4.78e-04 3.06e-03 1.29e-02 1.14e-02 2.42e-02 9.22e-03 ph/cm2/s
Error 2.52e-01 2.78e-02 1.03e+00 7.37e-02 2.66e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.245 6.500 - - 1.12e-04 2.54e-04 62.850 57
CPL 0.068 0.000 225.8 5000.0 2.14e-04 0.00e+00 62.847 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.245 6.500 - - 1.12e-04 2.54e-04 62.850 57
CPL 0.068 0.000 225.8 5000.0 2.14e-04 0.00e+00 62.847 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
353.8012 +38.9026 0.0640 44.6 -134.0 0.0188 3.0 TRIG_00347954
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.668 -3.668 (delta_t = 57.000 [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: 0.245187 ( -3.24519 9.75481 )
Norm@50keV : 1.115178E-04 ( -1.115178E-04 3.970409E-04) )
------------------------------------------------------------
Chi-Squared = 62.85034 using 59 PHA bins.
Reduced chi-squared = 1.102638 for 57 degrees of freedom
Null hypothesis probability = 0.277
Photon flux (15-150 keV) in 6.4000E-02 sec: 1.398357E-02 ( -0.0139836 0.0764015 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10627e-10 ( -1.10627e-10 8.22042e-10 ) 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: 6.779180E-02 ( )
Epeak [keV] : 225.838 ( -84.4501 9915.54 )
Norm@50keV : 2.144552E-04 ( )
------------------------------------------------------------
Chi-Squared = 62.84677 using 59 PHA bins.
Reduced chi-squared = 1.122264 for 56 degrees of freedom
Null hypothesis probability = 0.247
Photon flux (15-150 keV) in 6.4000E-02 sec: 1.731416E-02 ( -0.0173142 0.418544 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.431e-10 ( -1.431e-10 5.86884e-10 ) 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 : 4.38539 ( -14.9972 2.754688E-03) )
beta : -9.35166 ( -0.630883 19.3691 )
Epeak [keV] : 114.848 ( -113.952 9885.95 )
Norm@50keV : 3.035551E-03 ( -4.180507E-03 30880.9 )
------------------------------------------------------------
Chi-Squared = 62.67516 using 59 PHA bins.
Reduced chi-squared = 1.139548 for 55 degrees of freedom
Null hypothesis probability = 0.223
Photon flux (15-150 keV) in 6.4000E-02 sec: 2.416993E-02 ( -0.0241699 0.123229 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03169e-10 ( -2.03169e-10 1.20484e-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: 0.245187 ( -3.24519 9.75481 )
Norm@50keV : 1.115178E-04 ( -1.115178E-04 3.970409E-04) )
------------------------------------------------------------
Chi-Squared = 62.85034 using 59 PHA bins.
Reduced chi-squared = 1.102638 for 57 degrees of freedom
Null hypothesis probability = 0.277
Photon flux (15-150 keV) in 6.4000E-02 sec: 1.398357E-02 ( -0.0139836 0.0764015 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10627e-10 ( -1.10627e-10 8.22042e-10 ) 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: 6.779180E-02 ( )
Epeak [keV] : 225.838 ( -84.4501 9915.54 )
Norm@50keV : 2.144552E-04 ( )
------------------------------------------------------------
Chi-Squared = 62.84677 using 59 PHA bins.
Reduced chi-squared = 1.122264 for 56 degrees of freedom
Null hypothesis probability = 0.247
Photon flux (15-150 keV) in 6.4000E-02 sec: 1.731416E-02 ( -0.0173142 0.418544 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.431e-10 ( -1.431e-10 5.86884e-10 ) 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 : 4.38539 ( -14.9972 2.754688E-03) )
beta : -9.35166 ( -0.630883 19.3691 )
Epeak [keV] : 114.848 ( -113.952 9885.95 )
Norm@50keV : 3.035551E-03 ( -4.180507E-03 30880.9 )
------------------------------------------------------------
Chi-Squared = 62.67516 using 59 PHA bins.
Reduced chi-squared = 1.139548 for 55 degrees of freedom
Null hypothesis probability = 0.223
Photon flux (15-150 keV) in 6.4000E-02 sec: 2.416993E-02 ( -0.0241699 0.123229 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03169e-10 ( -2.03169e-10 1.20484e-09 ) ergs/cm2
Plot creation:
Mon Mar 30 03:43:07 EDT 2009