batgrbproduct Analysis for Trigger=350853
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): Wed Apr 29 12:31:28 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger350853/GCN5_download_cron
======================================================================
Trigger: 00350853 Segment: 000
BAT Trigger Time: 262673624.576 [s; MET]
Trigger Stop: 262673625.6 [s; MET]
UTC: 2009-04-29T04:53:39.877600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 90.5593470267977 Dec: -52.3860905103926 [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: 8.30662386291807 [ if not an image trigger ]
Image S/N Ratio: 5.64
Flight Position: [ source = BAT ]
RA: 90.5593470267977 Dec: -52.3860905103926 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 90.5727439145371 Dec: -52.3886026160356 [deg; J2000]
{ 06h 02m 17.5s , -52d 23' 19.0" }
+/- 1.73203391561249 [arcmin] (estimated 90% radius based on SNR)
+/- 0.7846224151167 [arcmin] (formal 1-sigma fit error)
SNR: 13.8778929928415
Angular difference between Flight and Ground position is 0.513216 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 188.463999986649 +/- 37.3400443562956
Measured from: -5.34399992227554
to: 183.120000064373 [s; relative to TRIGTIME]
T50: 83.9039999544621 +/- 38.6406625253325
Measured from: 4.41600009799004
to: 88.3200000524521 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.348000019788742
to: 0.651999980211258 [s; relative to TRIGTIME]
Total Fluence
Measured from: -10.7520000040531
to: 202.960000008345 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.529445 0.646905 0.442608 0.239124
0.072443 0.072389 0.064780 0.058486 [error]
Peak 0.019508 0.027006 0.022672 0.009067
0.005085 0.005311 0.004763 0.004121 [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 1.47e-07 2.62e-07 3.57e-07 1.01e-06 1.03e-06 1.77e-06 erg/cm2
Error 2.91e-08 3.20e-08 6.35e-08 3.82e-07 1.50e-07 4.36e-07 erg/cm2
Peak flux Power-law 1.67e-01 1.87e-01 1.49e-01 1.98e-01 5.76e-01 7.01e-01 ph/cm2/s
Error 6.29e-02 4.20e-02 3.90e-02 1.14e-01 1.18e-01 1.53e-01 ph/cm2/s
Fluence Cutoff-PL 1.47e-07 2.62e-07 3.57e-07 9.99e-07 1.03e-06 1.61e-06 erg/cm2
Error 2.91e-08 3.21e-08 6.36e-08 3.79e-07 1.50e-07 6.27e-07 erg/cm2
Peak flux Cutoff-PL 1.66e-01 1.87e-01 1.49e-01 1.97e-01 5.75e-01 6.99e-01 ph/cm2/s
Error 6.29e-02 4.20e-02 3.90e-02 1.13e-01 1.18e-01 1.52e-01 ph/cm2/s
Fluence Band 1.39e-07 1.86e-05 1.56e-05 4.41e-05 4.52e-05 1.88e-06 erg/cm2
Error 2.64e-05 7.72e-05 7.21e-05 2.37e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.75e-01 2.05e-01 1.50e-01 1.05e-01 5.86e-01 6.35e-01 ph/cm2/s
Error 6.95e-02 4.82e-02 4.19e-02 1.37e-01 1.21e-01 1.80e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.552 0.224 - - 5.13e-04 6.71e-05 59.887 57
CPL 1.336 0.561 140.9 0.0 6.72e-04 4.92e-04 60.227 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.321 0.387 - - 4.81e-03 9.91e-04 71.715 57
CPL 1.318 0.390 9990.5 5000.0 4.82e-03 9.97e-04 71.723 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: 26.496000 sec.
T50 in the 50-300 keV band: 12.032000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 213.712 -10.752 202.960
T90 188.464 -5.344 183.120
T50 83.904 4.416 88.320
Peak 1.000 -0.348 0.652
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
90.5727 -52.3886 0.0138 14.5 -26.6 0.7159 13.9 TRIG_00350853
------------------------------------------
Foreground time interval of the image:
-10.752 10.025 (delta_t = 20.777 [sec])
Background time interval of the image:
-60.576 -10.752 (delta_t = 49.824 [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 -10.752 sec. to 202.960 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55182 ( -0.221412 0.225670 )
Norm@50keV : 5.131696E-04 ( -6.767368E-05 6.650510E-05) )
------------------------------------------------------------
Chi-Squared = 59.88741 using 59 PHA bins.
Reduced chi-squared = 1.050656 for 57 degrees of freedom
Null hypothesis probability = 0.371
Photon flux (15-150 keV) in 213.7 sec: 6.499749E-02 ( -0.00787573 0.00788088 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03204e-06 ( -1.4859e-07 1.51823e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.752 sec. to 202.960 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33611 ( -0.667625 0.453609 )
Epeak [keV] : 140.906 ( )
Norm@50keV : 6.716711E-04 ( -1.060083E-04 8.787269E-04) )
------------------------------------------------------------
Chi-Squared = 60.22715 using 59 PHA bins.
Reduced chi-squared = 1.075485 for 56 degrees of freedom
Null hypothesis probability = 0.325
Photon flux (15-150 keV) in 213.7 sec: 6.497526E-02 ( -0.00787303 0.00787831 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03198e-06 ( -1.48575e-07 1.5187e-07 ) ergs/cm2
Band function
Time interval is from -10.752 sec. to 202.960 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.04277 ( -8.95723 5.42927 )
beta : -1.61874 ( -8.38126 0.277002 )
Epeak [keV] : 61.2526 ( -61.1526 345.840 )
Norm@50keV : 1.102077E-03 ( -1.102077E-03 21.3934 )
------------------------------------------------------------
Chi-Squared = 59.63391 using 59 PHA bins.
Reduced chi-squared = 1.084253 for 55 degrees of freedom
Null hypothesis probability = 0.311
Photon flux (15-150 keV) in 213.7 sec: 6.465019E-02 ( -0.00811399 0.00800638 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.52063e-05 ( -4.52063e-05 9.89288e-05 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.352 sec. to 0.656 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32078 ( -0.390117 0.384410 )
Norm@50keV : 4.805413E-03 ( -9.967866E-04 9.851754E-04) )
------------------------------------------------------------
Chi-Squared = 71.71488 using 59 PHA bins.
Reduced chi-squared = 1.258156 for 57 degrees of freedom
Null hypothesis probability = 9.077E-02
Photon flux (15-150 keV) in 1.008 sec: 0.575551 ( -0.117742 0.118016 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.75925e-08 ( -1.12018e-08 1.1556e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.352 sec. to 0.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31778 ( -0.392684 0.386487 )
Epeak [keV] : 9990.47 ( -9990.46 9.53223 )
Norm@50keV : 4.824500E-03 ( -1.003890E-03 9.909519E-04) )
------------------------------------------------------------
Chi-Squared = 71.72282 using 59 PHA bins.
Reduced chi-squared = 1.280765 for 56 degrees of freedom
Null hypothesis probability = 7.673E-02
Photon flux (15-150 keV) in 1.008 sec: 0.575334 ( -0.117704 0.117981 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.76387e-08 ( -1.12549e-08 1.15111e-08 ) ergs/cm2
Band function
Time interval is from -0.352 sec. to 0.656 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.918009 ( )
beta : -1.34073 ( )
Epeak [keV] : 73.3465 ( )
Norm@50keV : 9.332396E-03 ( )
------------------------------------------------------------
Chi-Squared = 71.68458 using 59 PHA bins.
Reduced chi-squared = 1.303356 for 55 degrees of freedom
Null hypothesis probability = 6.480E-02
Photon flux (15-150 keV) in 1.008 sec: 0.585676 ( -0.121056 0.121211 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.52862e-08 ( -1.22395e-08 1.01105e-08 ) ergs/cm2
Plot creation:
Wed Apr 29 12:57:24 EDT 2009