batgrbproduct Analysis for Trigger=374151
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 v2.45
Process Start Time (local time): Wed Oct 28 16:06:16 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger374151/GCN5_download_cron
======================================================================
Trigger: 00374151 Segment: 000
BAT Trigger Time: 278405401.472 [s; MET]
Trigger Stop: 278405403.52 [s; MET]
UTC: 2009-10-28T06:49:56.262080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 268.052731861797 Dec: -22.320198910947 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.84
Image Trigger?: NO
Rate S/N Ratio: 8.30662386291807 [ if not an image trigger ]
Image S/N Ratio: 6.84
Flight Position: [ source = BAT ]
RA: 268.052731861797 Dec: -22.320198910947 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 268.08555581423 Dec: -22.5179052657146 [deg; J2000]
{ 17h 52m 20.5s , -22d 31' 04.5" }
+/- 31.2202259428728 [arcmin] (estimated 90% radius based on SNR)
+/- 44.9645417201551 [arcmin] (formal 1-sigma fit error)
SNR: 0.222951166473413
Angular difference between Flight and Ground position is 12.001276 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 548.067999899387 +/- 87.1126250483934
Measured from: 86.5720001459122
to: 634.6400000453 [s; relative to TRIGTIME]
T50: 252.579999923706 +/- 48.7107584414024
Measured from: 298.468000113964
to: 551.04800003767 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 617.364000022411
to: 618.364000022411 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.283999979496002
to: 653.283999979496 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.173148 5.368293 3.327831 0.754385
0.157388 0.146590 0.125392 0.109380 [error]
Peak 0.036563 0.040044 0.015209 0.009997
0.006513 0.006196 0.005217 0.004179 [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 1.28e-06 2.09e-06 2.60e-06 6.40e-06 7.77e-06 1.24e-05 erg/cm2
Error 8.34e-08 7.84e-08 1.28e-07 7.00e-07 2.98e-07 7.84e-07 erg/cm2
Peak flux Power-law 3.17e-01 2.57e-01 1.41e-01 1.13e-01 7.65e-01 8.27e-01 ph/cm2/s
Error 9.08e-02 4.81e-02 4.34e-02 6.95e-02 1.44e-01 1.58e-01 ph/cm2/s
Fluence Cutoff-PL 1.24e-06 2.12e-06 2.62e-06 4.87e-06 7.65e-06 1.08e-05 erg/cm2
Error 7.55e-08 8.93e-08 1.32e-07 1.68e-06 3.50e-07 1.87e-06 erg/cm2
Peak flux Cutoff-PL 3.17e-01 2.57e-01 1.41e-01 1.12e-01 7.64e-01 8.26e-01 ph/cm2/s
Error 9.08e-02 4.81e-02 4.34e-02 6.90e-02 1.44e-01 1.57e-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 1.687 0.069 - - 1.28e-03 4.67e-05 63.690 57
CPL 1.533 0.000 149.3 0.0 1.54e-03 0.00e+00 62.370 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.868 0.371 - - 5.40e-03 1.25e-03 61.890 57
CPL 1.868 0.000 969.4 0.0 5.42e-03 0.00e+00 61.900 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 653.568 -0.284 653.284
T90 548.068 86.572 634.640
T50 252.580 298.468 551.048
Peak 1.000 617.364 618.364
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
268.0856 -22.5179 0.8606 15.5 -139.2 0.1068 0.2 TRIG_00374151
------------------------------------------
Foreground time interval of the image:
-0.284 353.648 (delta_t = 353.932 [sec])
354.528 598.329 (delta_t = 243.801 [sec])
Background time interval of the image:
-239.472 -0.284 (delta_t = 239.188 [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
Multiple GTIs in the spectrum
tstart tstop
-0.284000 353.648000
354.528000 653.284000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68713 ( -0.0688612 0.0691575 )
Norm@50keV : 1.28490E-03 ( -4.67686e-05 4.65628e-05 )
------------------------------------------------------------
# Chi-Squared = 63.69 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 57 degrees of freedom
# Null hypothesis probability = 2.529728e-01
Photon flux (15-150 keV) in 652.7 sec: 0.169888 ( -0.00639329 0.00641269 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.77307e-06 ( -2.96944e-07 2.98154e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-0.284000 353.648000
354.528000 653.284000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53284 ( )
Epeak [keV] : 149.257 ( )
Norm@50keV : 1.53758E-03 ( )
------------------------------------------------------------
# Chi-Squared = 62.37 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 56 degrees of freedom
# Null hypothesis probability = 2.599997e-01
Photon flux (15-150 keV) in 652.7 sec: 0.167715 ( -0.007071 0.007081 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.64566e-06 ( -3.5409e-07 3.46518e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-0.284000 353.648000
354.528000 653.284000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.305099 ( -1.69766 3.71277 )
beta : -1.78135 ( -0.119519 0.0925245 )
Epeak [keV] : 34.4288 ( -7.89708 27.8092 )
Norm@50keV : 2.82222E-02 ( -0.0282222 28.5151 )
------------------------------------------------------------
# Chi-Squared = 56.98 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 55 degrees of freedom
# Null hypothesis probability = 4.012572e-01
Photon flux (15-150 keV) in 652.7 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 617.364 sec. to 618.364 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86775 ( -0.358469 0.384443 )
Norm@50keV : 5.40038E-03 ( -0.0012791 0.00121837 )
------------------------------------------------------------
# Chi-Squared = 61.89 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 57 degrees of freedom
# Null hypothesis probability = 3.058871e-01
Photon flux (15-150 keV) in 1 sec: 0.764617 ( -0.143752 0.143816 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.96473e-08 ( -1.12484e-08 1.1693e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 617.364 sec. to 618.364 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86824 ( )
Epeak [keV] : 969.394 ( )
Norm@50keV : 5.42400E-03 ( )
------------------------------------------------------------
# Chi-Squared = 61.90 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 56 degrees of freedom
# Null hypothesis probability = 2.737406e-01
Photon flux (15-150 keV) in 1 sec: 0.764337 ( -0.143707 0.143767 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.9637e-08 ( -1.12473e-08 1.16936e-08 ) ergs/cm2
Band function
Time interval is from 617.364 sec. to 618.364 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.31594 ( 1.31455 1.31455 )
beta : -1.99029 ( 1.99447 0.475256 )
Epeak [keV] : 40.4082 ( -39.7958 205.173 )
Norm@50keV : 1.24793E-02 ( -0.0129221 2889.11 )
------------------------------------------------------------
# Chi-Squared = 61.74 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 55 degrees of freedom
# Null hypothesis probability = 2.479773e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Wed Oct 28 16:26:08 EDT 2009