batgrbproduct Analysis for Trigger=349510
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 v2.44
Process Start Time (local time): Sat Apr 18 15:33:01 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger349510/GCN5_download_cron
======================================================================
Trigger: 00349510 Segment: 000
BAT Trigger Time: 261745664.896 [s; MET]
Trigger Stop: 261745665.92 [s; MET]
UTC: 2009-04-18T11:07:40.226940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 269.33377128532 Dec: 33.4087902749121 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.16
Image Trigger?: NO
Rate S/N Ratio: 16.9410743460974 [ if not an image trigger ]
Image S/N Ratio: 8.16
Flight Position: [ source = BAT ]
RA: 269.33377128532 Dec: 33.4087902749121 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 269.319901660802 Dec: 33.4067707414425 [deg; J2000]
{ 17h 57m 16.8s , +33d 24' 24.4" }
+/- 1.42597471588349 [arcmin] (estimated 90% radius based on SNR)
+/- 0.541791298222326 [arcmin] (formal 1-sigma fit error)
SNR: 18.321398877576
Angular difference between Flight and Ground position is 0.705168 arcmin
Partial Coding Fraction: 0.3164062 [ including projection effects ]
Duration
T90: 56.1959999799728 +/- 4.12921107301137
Measured from: -2.99199989438057
to: 53.2040000855923 [s; relative to TRIGTIME]
T50: 29.4560000002384 +/- 2.9338063976611
Measured from: 13.3440001010895
to: 42.8000001013279 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0640000104904175
to: 1.06400001049042 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.50799998641014
to: 61.1119999885559 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.668192 2.414087 2.078136 0.633483
0.072642 0.075235 0.070566 0.062680 [error]
Peak 0.051496 0.073449 0.073570 0.028661
0.011088 0.012150 0.011649 0.009949 [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 6.06e-07 1.12e-06 1.61e-06 4.86e-06 4.58e-06 8.14e-06 erg/cm2
Error 4.31e-08 4.64e-08 6.98e-08 4.82e-07 1.72e-07 5.22e-07 erg/cm2
Peak flux Power-law 5.59e-01 6.09e-01 4.73e-01 6.02e-01 1.87e+00 2.24e+00 ph/cm2/s
Error 1.69e-01 1.13e-01 9.20e-02 2.46e-01 3.17e-01 3.73e-01 ph/cm2/s
Fluence Cutoff-PL 5.98e-07 1.13e-06 1.62e-06 4.51e-06 4.57e-06 7.81e-06 erg/cm2
Error 5.12e-08 4.92e-08 7.26e-08 9.86e-07 1.73e-07 1.00e-06 erg/cm2
Peak flux Cutoff-PL 5.56e-01 6.09e-01 4.73e-01 5.98e-01 1.87e+00 2.20e+00 ph/cm2/s
Error 1.69e-01 1.13e-01 9.21e-02 2.44e-01 3.17e-01 4.58e-01 ph/cm2/s
Fluence Band 5.99e-07 1.12e-06 1.61e-06 4.82e-06 4.58e-06 8.20e-06 erg/cm2
Error 5.03e-08 4.62e-08 7.65e-08 9.80e-07 1.80e-07 1.00e-06 erg/cm2
Peak flux Band 5.45e-01 6.14e-01 4.75e-01 5.99e-01 1.86e+00 2.25e+00 ph/cm2/s
Error 1.78e-01 1.32e-01 9.10e-02 2.38e-01 3.24e-01 3.74e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.484 0.066 - - 6.92e-03 2.46e-04 35.091 57
CPL 1.436 0.175 643.2 0.0 7.27e-03 2.47e-04 35.105 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.366 0.286 - - 1.54e-02 2.52e-03 48.037 57
CPL 1.278 2.127 439.6 0.0 1.70e-02 2.53e-03 48.061 0
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: 52.608000 sec.
T50 in the 50-300 keV band: 32.704000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 69.620 -8.508 61.112
T90 56.196 -2.992 53.204
T50 29.456 13.344 42.800
Peak 1.000 0.064 1.064
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
269.3199 +33.4068 0.0106 46.3 1.8 1.6414 18.3 TRIG_00349510
------------------------------------------
Foreground time interval of the image:
-8.508 10.105 (delta_t = 18.613 [sec])
Background time interval of the image:
-239.896 -8.508 (delta_t = 231.388 [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 -8.508 sec. to 61.112 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48413 ( -6.634724E-02 6.641805E-02) )
Norm@50keV : 6.919038E-03 ( -2.459362E-04 2.459325E-04) )
------------------------------------------------------------
Chi-Squared = 35.09059 using 59 PHA bins.
Reduced chi-squared = 0.6156244 for 57 degrees of freedom
Null hypothesis probability = 0.990
Photon flux (15-150 keV) in 69.62 sec: 0.860135 ( -0.03374 0.033908 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.58183e-06 ( -1.71627e-07 1.71843e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.508 sec. to 61.112 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43608 ( -0.237288 0.112225 )
Epeak [keV] : 643.209 ( )
Norm@50keV : 7.268983E-03 ( -2.462436E-04 2.472829E-04) )
------------------------------------------------------------
Chi-Squared = 35.10469 using 59 PHA bins.
Reduced chi-squared = 0.6268694 for 56 degrees of freedom
Null hypothesis probability = 0.987
Photon flux (15-150 keV) in 69.62 sec: 0.859711 ( -0.033721 0.033891 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.56892e-06 ( -1.71697e-07 1.74099e-07 ) ergs/cm2
Band function
Time interval is from -8.508 sec. to 61.112 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07547 ( -3.02577 8.40345 )
beta : -1.50261 ( -6.652427E-02 6.640315E-02) )
Epeak [keV] : 72.9234 ( -72.8234 9927.08 )
Norm@50keV : 1.262716E-02 ( -3.342652E-02 3.342563E-02) )
------------------------------------------------------------
Chi-Squared = 35.23755 using 59 PHA bins.
Reduced chi-squared = 0.6406826 for 55 degrees of freedom
Null hypothesis probability = 0.982
Photon flux (15-150 keV) in 69.62 sec: 0.855107 ( -0.039148 0.035649 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.57804e-06 ( -1.87375e-07 1.72094e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.064 sec. to 1.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36601 ( -0.285651 0.285573 )
Norm@50keV : 1.543763E-02 ( -2.526076E-03 2.522987E-03) )
------------------------------------------------------------
Chi-Squared = 48.03652 using 59 PHA bins.
Reduced chi-squared = 0.8427460 for 57 degrees of freedom
Null hypothesis probability = 0.795
Photon flux (15-150 keV) in 1.000 sec: 1.86602 ( -0.31607 0.31732 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50246e-07 ( -2.6789e-08 2.6981e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.064 sec. to 1.064 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27775 ( -1.02860 3.22502 )
Epeak [keV] : 439.594 ( )
Norm@50keV : 1.701705E-02 ( -2.537209E-03 2.532271E-03) )
------------------------------------------------------------
Chi-Squared = 48.06094 using 59 PHA bins.
but latest trial 3.86089 gives Chi-Squared = 2.54469
Reduced chi-squared = 0.8582310 for 56 degrees of freedom
Null hypothesis probability = 0.766
Photon flux (15-150 keV) in 1.000 sec: 1.86548 ( -0.31598 0.31722 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.49948e-07 ( -2.7281e-08 2.739e-08 ) ergs/cm2
Band function
Time interval is from 0.064 sec. to 1.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.954326 ( -9.04567 5.78774 )
beta : -1.37705 ( -8.62295 0.293076 )
Epeak [keV] : 65.5935 ( -65.4935 9933.91 )
Norm@50keV : 3.092886E-02 ( -1.72289 1287.73 )
------------------------------------------------------------
Chi-Squared = 47.97161 using 59 PHA bins.
Reduced chi-squared = 0.8722112 for 55 degrees of freedom
Null hypothesis probability = 0.738
Photon flux (15-150 keV) in 1.000 sec: 1.86062 ( -0.33232 0.31507 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50073e-07 ( -2.6693e-08 2.7069e-08 ) ergs/cm2
Plot creation:
Sat Apr 18 15:49:18 EDT 2009