batgrbproduct Analysis for Trigger=349718
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 22 11:25:56 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger349718/GCN5_download_cron
======================================================================
Trigger: 00349718 Segment: 000
BAT Trigger Time: 261991824.128 [s; MET]
Trigger Stop: 261991828.224 [s; MET]
UTC: 2009-04-21T07:30:19.451160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 311.382173194411 Dec: -72.5775125348574 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.79
Image Trigger?: NO
Rate S/N Ratio: 14.9666295470958 [ if not an image trigger ]
Image S/N Ratio: 5.79
Flight Position: [ source = BAT ]
RA: 311.382173194411 Dec: -72.5775125348574 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 311.333313507712 Dec: -72.5973756585196 [deg; J2000]
{ 20h 45m 20.0s , -72d 35' 50.6" }
+/- 3.6062732183693 [arcmin] (estimated 90% radius based on SNR)
+/- 1.99406277926859 [arcmin] (formal 1-sigma fit error)
SNR: 4.86766119079454
Angular difference between Flight and Ground position is 1.479854 arcmin
Partial Coding Fraction: 0.765625 [ including projection effects ]
Duration
T90: 4.09600001573563 +/-
Measured from: 0
to: 4.09600001573563 [s; relative to TRIGTIME]
T50: 4.09600001573563 +/-
Measured from: 0
to: 4.09600001573563 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 4.09600001573563 second)
Measured from: 0
to: 4.09600001573563 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 4.09600001573563 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.072458 0.036197 -0.004869 0.006665
0.014043 0.012405 0.010619 0.009425 [error]
Peak 0.072458 0.036197 -0.004869 0.006665
0.014043 0.012405 0.010619 0.009425 [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 1.94e-08 1.50e-08 7.78e-09 5.83e-09 4.48e-08 4.77e-08 erg/cm2
Error 6.40e-09 6.37e-09 6.43e-09 9.38e-09 1.79e-08 2.27e-08 erg/cm2
Peak flux Power-law 1.57e-01 6.84e-02 1.77e-02 5.68e-03 2.47e-01 2.49e-01 ph/cm2/s
Error 5.28e-02 2.79e-02 1.42e-02 9.01e-03 7.76e-02 7.90e-02 ph/cm2/s
Fluence Cutoff-PL 1.97e-08 1.86e-08 2.50e-09 1.64e-11 4.08e-08 4.09e-08 erg/cm2
Error 7.22e-09 8.81e-09 5.45e-09 3.50e-09 1.41e-08 1.41e-08 erg/cm2
Peak flux Cutoff-PL 1.55e-01 8.69e-02 6.47e-03 2.29e-05 2.49e-01 2.49e-01 ph/cm2/s
Error 5.93e-02 3.87e-02 1.26e-02 1.82e-03 7.45e-02 7.45e-02 ph/cm2/s
Fluence Band 2.06e-08 1.55e-08 6.41e-09 3.60e-09 4.46e-08 4.80e-08 erg/cm2
Error 6.66e-09 4.58e-09 3.09e-09 3.78e-09 1.37e-08 1.83e-08 erg/cm2
Peak flux Band 1.58e-01 8.34e-02 9.44e-03 1.47e-04 2.51e-01 2.50e-01 ph/cm2/s
Error 4.69e-02 2.48e-02 9.84e-03 4.34e-03 7.45e-02 7.44e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.946 0.745 - - 9.33e-04 7.80e-04 53.685 57
CPL 0.006 3.122 20.2 15.2 1.08e-01 4.47e+00 51.141 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.946 0.745 - - 9.33e-04 7.80e-04 53.685 57
CPL 0.006 2.697 20.2 15.2 1.08e-01 4.47e+00 51.141 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 4.096 0.000 4.096
T90 4.096 0.000 4.096
T50 4.096 0.000 4.096
Peak 4.096 0.000 4.096
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
311.3333 -72.5974 0.0392 26.7 -133.9 0.1265 4.9 TRIG_00349718
------------------------------------------
Foreground time interval of the image:
0.000 4.096 (delta_t = 4.096 [sec])
Background time interval of the image:
-60.128 -16.128 (delta_t = 44.000 [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 4.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.94595 ( -0.636844 0.854068 )
Norm@50keV : 9.328397E-04 ( -9.328398E-04 6.276024E-04) )
------------------------------------------------------------
Chi-Squared = 53.68538 using 59 PHA bins.
Reduced chi-squared = 0.9418487 for 57 degrees of freedom
Null hypothesis probability = 0.600
Photon flux (15-150 keV) in 4.096 sec: 0.246803 ( -0.077384 0.077853 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.48123e-08 ( -1.67786e-08 1.89551e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.224640E-03 ( -3.00622 3.23703 )
Epeak [keV] : 20.2069 ( -20.1969 10.2397 )
Norm@50keV : 0.107656 ( -0.107656 8.82730 )
------------------------------------------------------------
Chi-Squared = 51.14146 using 59 PHA bins.
Reduced chi-squared = 0.9132404 for 56 degrees of freedom
Null hypothesis probability = 0.659
Photon flux (15-150 keV) in 4.096 sec: 0.248852 ( -0.074302 0.074714 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.08208e-08 ( -1.32699e-08 1.49704e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.40336 ( -8.59664 0.805525 )
beta : -9.33507 ( -1.430511E-05 7.93749 )
Epeak [keV] : 10.5645 ( -9.66266 20.9395 )
Norm@50keV : 1.118850E-02 ( -0.460466 294.739 )
------------------------------------------------------------
Chi-Squared = 52.34920 using 59 PHA bins.
Reduced chi-squared = 0.9518036 for 55 degrees of freedom
Null hypothesis probability = 0.577
Photon flux (15-150 keV) in 4.096 sec: 0.250944 ( -0.074502 0.074517 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.45538e-08 ( -1.37838e-08 1.36741e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.94595 ( -0.636844 0.854068 )
Norm@50keV : 9.328397E-04 ( -9.328398E-04 6.276024E-04) )
------------------------------------------------------------
Chi-Squared = 53.68538 using 59 PHA bins.
Reduced chi-squared = 0.9418487 for 57 degrees of freedom
Null hypothesis probability = 0.600
Photon flux (15-150 keV) in 4.096 sec: 0.246803 ( -0.077384 0.077853 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.48123e-08 ( -1.67786e-08 1.89551e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.224640E-03 ( -3.00622 2.38870 )
Epeak [keV] : 20.2069 ( -20.1969 10.2397 )
Norm@50keV : 0.107656 ( -0.107656 8.82730 )
------------------------------------------------------------
Chi-Squared = 51.14146 using 59 PHA bins.
Reduced chi-squared = 0.9132404 for 56 degrees of freedom
Null hypothesis probability = 0.659
Photon flux (15-150 keV) in 4.096 sec: 0.248852 ( -0.074302 0.074714 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.08208e-08 ( -1.32699e-08 1.49704e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.40336 ( -8.59664 0.805525 )
beta : -9.33507 ( )
Epeak [keV] : 10.5645 ( )
Norm@50keV : 1.118850E-02 ( )
------------------------------------------------------------
Chi-Squared = 52.34920 using 59 PHA bins.
Reduced chi-squared = 0.9518036 for 55 degrees of freedom
Null hypothesis probability = 0.577
Photon flux (15-150 keV) in 4.096 sec: 0.250944 ( -0.074502 0.074517 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.45538e-08 ( -1.37838e-08 1.36741e-08 ) ergs/cm2
Plot creation:
Wed Apr 22 11:50:17 EDT 2009