batgrbproduct Analysis for Trigger=352648
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 May 20 12:05:29 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger352648/GCN5_download_cron
======================================================================
Trigger: 00352648 Segment: 000
BAT Trigger Time: 264460141.184 [s; MET]
Trigger Stop: 264460153.344 [s; MET]
UTC: 2009-05-19T21:08:56.428660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 142.292608313677 Dec: 0.182991992937532 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.61
Image Trigger?: NO
Rate S/N Ratio: 13.6747943311773 [ if not an image trigger ]
Image S/N Ratio: 8.61
Flight Position: [ source = BAT ]
RA: 142.292608313677 Dec: 0.182991992937532 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 142.317056677252 Dec: 0.18963664960799 [deg; J2000]
{ 09h 29m 16.1s , +00d 11' 22.7" }
+/- 1.96160053845576 [arcmin] (estimated 90% radius based on SNR)
+/- 0.847773810506954 [arcmin] (formal 1-sigma fit error)
SNR: 11.6172484405331
Angular difference between Flight and Ground position is 1.520106 arcmin
Partial Coding Fraction: 0.578125 [ including projection effects ]
Duration
T90: 64.216000020504 +/- 11.1844155868162
Measured from: -10.8199999034405
to: 53.3960001170635 [s; relative to TRIGTIME]
T50: 27.3959999978542 +/- 13.1061837192304
Measured from: -3.77199989557266
to: 23.6240001022816 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -9.90799999237061
to: -8.90799999237061 [s; relative to TRIGTIME]
Total Fluence
Measured from: -12.4439999759197
to: 60.3840000033379 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.353013 0.537012 0.556616 0.210070
0.058690 0.058553 0.053286 0.047698 [error]
Peak 0.019239 0.022455 0.025738 0.006109
0.006947 0.007025 0.006751 0.005789 [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 8.76e-08 2.17e-07 4.31e-07 2.12e-06 1.16e-06 2.86e-06 erg/cm2
Error 2.00e-08 2.90e-08 5.05e-08 6.02e-07 1.33e-07 6.23e-07 erg/cm2
Peak flux Power-law 9.16e-02 1.47e-01 1.79e-01 4.27e-01 5.40e-01 8.44e-01 ph/cm2/s
Error 7.56e-02 7.11e-02 5.16e-02 3.69e-01 1.64e-01 3.30e-01 ph/cm2/s
Fluence Cutoff-PL 8.76e-08 2.18e-07 4.32e-07 2.11e-06 1.16e-06 2.85e-06 erg/cm2
Error 2.00e-08 2.90e-08 5.06e-08 5.98e-07 1.33e-07 6.19e-07 erg/cm2
Peak flux Cutoff-PL 9.13e-02 1.47e-01 1.79e-01 4.24e-01 5.40e-01 8.42e-01 ph/cm2/s
Error 7.55e-02 7.11e-02 5.17e-02 3.67e-01 1.66e-01 3.29e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 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 1.012 0.197 - - 1.48e-03 1.59e-04 50.030 57
CPL 1.007 0.478 9999.0 0.0 1.49e-03 8.41e-04 50.030 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.719 0.712 - - 4.68e-03 1.62e-03 84.440 57
CPL 0.713 0.722 10000.0 0.0 4.71e-03 1.62e-03 84.460 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: 22.208000 sec.
T50 in the 50-300 keV band: 14.016000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 72.828 -12.444 60.384
T90 64.216 -10.820 53.396
T50 27.396 -3.772 23.624
Peak 1.000 -9.908 -8.908
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
142.3171 +0.1896 0.0165 22.4 75.1 1.7603 11.6 TRIG_00352648
------------------------------------------
Foreground time interval of the image:
-12.444 60.384 (delta_t = 72.828 [sec])
Background time interval of the image:
-100.883 -12.444 (delta_t = 88.439 [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 -12.444 sec. to 60.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01242 ( -0.200292 0.193161 )
Norm@50keV : 1.48496E-03 ( -0.000159312 0.000158414 )
------------------------------------------------------------
# Chi-Squared = 50.03 using 59 PHA bins.
# Reduced chi-squared = 0.8777 for 57 degrees of freedom
# Null hypothesis probability = 7.319548e-01
Photon flux (15-150 keV) in 72.83 sec: 0.170964 ( -0.0187617 0.0188547 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16459e-06 ( -1.32762e-07 1.331e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -12.444 sec. to 60.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00673 ( -0.616163 0.338842 )
Epeak [keV] : 9999.01 ( )
Norm@50keV : 1.49370E-03 ( -0.000157509 0.00152486 )
------------------------------------------------------------
# Chi-Squared = 50.03 using 59 PHA bins.
# Reduced chi-squared = 0.8934 for 56 degrees of freedom
# Null hypothesis probability = 6.991479e-01
Photon flux (15-150 keV) in 72.83 sec: 0.171021 ( -0.018756 0.018848 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16465e-06 ( -1.32594e-07 1.33432e-07 ) ergs/cm2
Band function
Time interval is from -12.444 sec. to 60.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.85420 ( -15.0735 -15.0735 )
beta : -1.04476 ( -0.243362 0.20814 )
Epeak [keV] : 25.9160 ( -24.7625 10.0929 )
Norm@50keV : 64.0766 ( -64.3362 221773 )
------------------------------------------------------------
# Chi-Squared = 49.52 using 59 PHA bins.
# Reduced chi-squared = 0.9003 for 55 degrees of freedom
# Null hypothesis probability = 6.832852e-01
Photon flux (15-150 keV) in 72.83 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -9.908 sec. to -8.908 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.719498 ( -0.800889 0.622767 )
Norm@50keV : 4.67701E-03 ( -0.00176741 0.00146979 )
------------------------------------------------------------
# Chi-Squared = 84.44 using 59 PHA bins.
# Reduced chi-squared = 1.481 for 57 degrees of freedom
# Null hypothesis probability = 1.057511e-02
Photon flux (15-150 keV) in 1 sec: 0.539842 ( -0.161178 0.166154 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.66085e-08 ( -1.7134e-08 1.71847e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.908 sec. to -8.908 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.712748 ( -0.868755 0.574251 )
Epeak [keV] : 10000.00 ( )
Norm@50keV : 4.71324E-03 ( -0.00177001 0.00147354 )
------------------------------------------------------------
# Chi-Squared = 84.46 using 59 PHA bins.
# Reduced chi-squared = 1.508 for 56 degrees of freedom
# Null hypothesis probability = 8.305802e-03
Photon flux (15-150 keV) in 1 sec: 0.539536 ( -0.165478 0.166103 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.66153e-08 ( -1.71472e-08 1.72011e-08 ) ergs/cm2
Band function
Time interval is from -9.908 sec. to -8.908 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.672049 ( 0.672531 0.672531 )
beta : -0.719230 ( 0.718817 0.800607 )
Epeak [keV] : 20.1556 ( -20.1381 -20.1381 )
Norm@50keV : 6.46470E-03 ( -0.00320725 112701 )
------------------------------------------------------------
# Chi-Squared = 84.44 using 59 PHA bins.
# Reduced chi-squared = 1.535 for 55 degrees of freedom
# Null hypothesis probability = 6.528229e-03
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Wed May 20 12:12:27 EDT 2009