batgrbproduct Analysis for Trigger=347923
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 v2.42
Process Start Time (local time): Sun Mar 29 23:58:14 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger347923/GCN5_download_cron
======================================================================
Trigger: 00347923 Segment: 000
BAT Trigger Time: 260028379.136 [s; MET]
Trigger Stop: 260028380.16 [s; MET]
UTC: 2009-03-29T14:06:14.521240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 324.795461178371 Dec: -9.88354571221357 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.77
Image Trigger?: NO
Rate S/N Ratio: 27.367864366808 [ if not an image trigger ]
Image S/N Ratio: 5.77
Flight Position: [ source = BAT ]
RA: 324.795461178371 Dec: -9.88354571221357 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 324.803621365223 Dec: -9.86197673927626 [deg; J2000]
{ 21h 39m 12.9s , -09d 51' 43.1" }
+/- 3.56934237599982 [arcmin] (estimated 90% radius based on SNR)
+/- 2.61993628148401 [arcmin] (formal 1-sigma fit error)
SNR: 4.93976915758726
Angular difference between Flight and Ground position is 1.381110 arcmin
Partial Coding Fraction: 0.703125 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.006528 0.063862 0.031887 0.014355
0.010095 0.011956 0.012211 0.015893 [error]
Peak 0.006528 0.063862 0.031887 0.014355
0.010095 0.011956 0.012211 0.015893 [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 7.62e-09 1.68e-08 2.93e-08 1.18e-07 8.00e-08 1.73e-07 erg/cm2
Error 3.83e-09 5.61e-09 1.14e-08 9.73e-08 2.91e-08 1.07e-07 erg/cm2
Peak flux Power-law 2.39e-01 2.87e-01 2.49e-01 3.70e-01 9.05e-01 1.14e+00 ph/cm2/s
Error 1.22e-01 9.74e-02 9.42e-02 2.80e-01 2.87e-01 3.90e-01 ph/cm2/s
Fluence Cutoff-PL 5.48e-09 2.52e-08 2.50e-08 2.48e-09 5.81e-08 5.82e-08 erg/cm2
Error 2.59e-09 7.94e-09 1.40e-08 1.39e-08 2.19e-08 2.53e-08 erg/cm2
Peak flux Cutoff-PL 1.67e-01 4.22e-01 2.30e-01 1.27e-02 8.31e-01 8.32e-01 ph/cm2/s
Error 8.06e-02 1.36e-01 1.21e-01 6.11e-02 2.41e-01 2.40e-01 ph/cm2/s
Fluence Band 4.04e-09 2.62e-08 2.64e-08 1.75e-08 6.56e-08 4.80e-08 erg/cm2
Error 8.02e-09 1.27e-08 3.82e-08 2.46e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.56e-01 4.40e-01 2.36e-01 7.37e-02 8.61e-01 8.80e-01 ph/cm2/s
Error 1.38e-01 1.08e-01 1.34e-01 1.94e-01 4.00e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.205 0.497 - - 7.71e-03 2.47e-03 53.807 57
CPL -2.488 0.000 52.4 12.5 8.87e-01 2.11e+00 48.316 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.205 0.497 - - 7.71e-03 2.47e-03 53.807 57
CPL -2.488 0.000 52.4 12.5 8.87e-01 2.11e+00 48.316 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
324.8036 -9.8620 0.0386 35.5 -158.2 0.1329 4.9 TRIG_00347923
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.136 -51.302 (delta_t = 8.833 [sec])
-50.136 -11.136 (delta_t = 39.000 [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 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20521 ( -0.500386 0.492876 )
Norm@50keV : 7.705653E-03 ( -2.476872E-03 2.466057E-03) )
------------------------------------------------------------
Chi-Squared = 53.80713 using 59 PHA bins.
Reduced chi-squared = 0.9439846 for 57 degrees of freedom
Null hypothesis probability = 0.596
Photon flux (15-150 keV) in 1.024 sec: 0.905155 ( -0.286935 0.287355 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.99924e-08 ( -2.84019e-08 2.97845e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.48784 ( )
Epeak [keV] : 52.4303 ( -9.66756 15.2558 )
Norm@50keV : 0.887083 ( -1.67998 2.54638 )
------------------------------------------------------------
Chi-Squared = 48.31563 using 59 PHA bins.
but latest trial 78.5593 gives Chi-Squared = 7.68723
Reduced chi-squared = 0.8627791 for 56 degrees of freedom
Null hypothesis probability = 0.758
Photon flux (15-150 keV) in 1.024 sec: 0.831029 ( -0.24068 0.240431 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.81084e-08 ( -1.84758e-08 2.5308e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.27658 ( -3.04552 2.72342 )
beta : -9.36814 ( -6.01548 13.9843 )
Epeak [keV] : 54.2600 ( -6.30585 27.8656 )
Norm@50keV : 0.621789 ( -8.39408 7.98290 )
------------------------------------------------------------
Chi-Squared = 48.48622 using 59 PHA bins.
Reduced chi-squared = 0.8815676 for 55 degrees of freedom
Null hypothesis probability = 0.720
Photon flux (15-150 keV) in 1.024 sec: 0.860605 ( -0.251034 0.1376 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.56365e-08 ( -1.90217e-08 3.01066e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20521 ( -0.500386 0.492876 )
Norm@50keV : 7.705653E-03 ( -2.476872E-03 2.466057E-03) )
------------------------------------------------------------
Chi-Squared = 53.80713 using 59 PHA bins.
Reduced chi-squared = 0.9439846 for 57 degrees of freedom
Null hypothesis probability = 0.596
Photon flux (15-150 keV) in 1.024 sec: 0.905155 ( -0.286935 0.287355 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.99924e-08 ( -2.84019e-08 2.97845e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.48784 ( )
Epeak [keV] : 52.4303 ( -9.66756 15.2558 )
Norm@50keV : 0.887083 ( -1.67998 2.54638 )
------------------------------------------------------------
Chi-Squared = 48.31563 using 59 PHA bins.
but latest trial 78.5593 gives Chi-Squared = 7.68723
Reduced chi-squared = 0.8627791 for 56 degrees of freedom
Null hypothesis probability = 0.758
Photon flux (15-150 keV) in 1.024 sec: 0.831029 ( -0.24068 0.240431 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.81084e-08 ( -1.84758e-08 2.5308e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.27658 ( -3.04552 2.72342 )
beta : -9.36814 ( -0.631861 19.3679 )
Epeak [keV] : 54.2600 ( -7.58359 29.5925 )
Norm@50keV : 0.621789 ( -12.8708 3.43137 )
------------------------------------------------------------
Chi-Squared = 48.48622 using 59 PHA bins.
Reduced chi-squared = 0.8815676 for 55 degrees of freedom
Null hypothesis probability = 0.720
Photon flux (15-150 keV) in 1.024 sec: 0.860605 ( -0.251034 0.1376 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.56365e-08 ( -1.90217e-08 3.01066e-08 ) ergs/cm2
Plot creation:
Mon Mar 30 00:05:51 EDT 2009