batgrbproduct Analysis for Trigger=351043
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): Sat May 2 05:53:14 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger351043/GCN5_download_cron
======================================================================
Trigger: 00351043 Segment: 000
BAT Trigger Time: 262936794.452 [s; MET]
Trigger Stop: 262936794.456 [s; MET]
UTC: 2009-05-02T05:59:49.745280 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 44.6386248120068 Dec: 73.5611430694981 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.76
Image Trigger?: NO
Rate S/N Ratio: 7.28010988928052 [ if not an image trigger ]
Image S/N Ratio: 5.76
Flight Position: [ source = BAT ]
RA: 44.6386248120068 Dec: 73.5611430694981 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 44.6468165947312 Dec: 73.5541827028657 [deg; J2000]
{ 02h 58m 35.2s , +73d 33' 15.1" }
+/- 3.57916612130045 [arcmin] (estimated 90% radius based on SNR)
+/- 1.72345780894041 [arcmin] (formal 1-sigma fit error)
SNR: 4.92041170461458
Angular difference between Flight and Ground position is 0.440185 arcmin
Partial Coding Fraction: 0.4179688 [ including projection effects ]
Duration
T90: 0.00400000810623169 +/-
Measured from: 0
to: 0.00400000810623169 [s; relative to TRIGTIME]
T50: 0.00400000810623169 +/-
Measured from: 0
to: 0.00400000810623169 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.00400000810623169 second)
Measured from: 0
to: 0.00400000810623169 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.00400000810623169 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.002355 0.002110 0.000359 0.000316
0.000878 0.001007 0.000359 0.000364 [error]
Peak 0.002355 0.002110 0.000359 0.000316
0.000878 0.001007 0.000359 0.000364 [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 6.23e-10 1.82e-09 4.25e-09 2.71e-08 1.15e-08 1.07e-08 erg/cm2
Error 4.77e-10 1.46e-09 6.22e-09 2.91e-07 2.16e-08 0.00e+00 erg/cm2
Peak flux Power-law 5.00e+00 7.75e+00 9.05e+00 2.04e+01 2.78e+01 4.21e+01 ph/cm2/s
Error 3.90e+00 6.19e+00 1.27e+01 1.24e+02 3.06e+01 1.35e+02 ph/cm2/s
Fluence Cutoff-PL 6.10e-10 1.91e-09 3.86e-09 2.62e-08 1.13e-08 6.34e-09 erg/cm2
Error 4.93e-10 6.20e-09 2.62e-07 2.15e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 5.06e+00 7.76e+00 9.03e+00 2.02e+01 2.77e+01 3.64e+01 ph/cm2/s
Error 3.97e+00 7.22e+00 1.27e+01 1.21e+02 3.06e+01 3.44e+02 ph/cm2/s
Fluence Band 6.25e-10 1.93e-09 2.14e-09 5.28e-10 5.15e-09 5.04e-09 erg/cm2
Error 5.68e-10 1.51e-09 4.72e-09 6.45e-10 6.27e-09 3.93e-09 erg/cm2
Peak flux Band 4.99e+00 7.76e+00 9.04e+00 2.01e+01 2.78e+01 3.50e+01 ph/cm2/s
Error 3.89e+00 7.01e+00 1.27e+01 1.21e+02 3.46e+01 1.37e+02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.777 3.054 - - 2.41e-01 2.18e-01 6.646 57
CPL 0.684 4.791 427.7 5000.0 2.80e-01 1.47e+02 6.652 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.777 3.054 - - 2.41e-01 2.18e-01 6.646 57
CPL 0.684 5.194 427.7 5000.0 2.80e-01 1.47e+02 6.652 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 0.004 0.000 0.004
T90 0.004 0.000 0.004
T50 0.004 0.000 0.004
Peak 0.004 0.000 0.004
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
44.6468 +73.5542 0.0391 31.2 -98.6 0.0060 4.9 TRIG_00351043
------------------------------------------
Foreground time interval of the image:
0.000 0.004 (delta_t = 0.004 [sec])
Background time interval of the image:
-46.951 -2.452 (delta_t = 44.499 [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 0.004 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.777428 ( -3.77743 2.32970 )
Norm@50keV : 0.241443 ( -0.211132 0.225262 )
------------------------------------------------------------
Chi-Squared = 6.646019 using 59 PHA bins.
Reduced chi-squared = 0.1165968 for 57 degrees of freedom
Null hypothesis probability = 1.00
Photon flux (15-150 keV) in 4.0000E-03 sec: 27.8027 ( -20.0053 41.2892 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14539e-08 ( -1.14539e-08 3.17565e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.004 sec.
Photon index: 0.684073 ( -3.66803 5.91363 )
Epeak [keV] : 427.681 ( -427.671 9572.32 )
Norm@50keV : 0.280289 ( -0.280289 294.494 )
------------------------------------------------------------
Chi-Squared = 6.652215 using 59 PHA bins.
but latest trial -40.3340 gives Chi-Squared = 5.36028
but latest trial 6.55267 gives Chi-Squared = 0.501669
but latest trial 294.775 gives Chi-Squared = 3.11536
Reduced chi-squared = 0.1187896 for 56 degrees of freedom
Null hypothesis probability = 1.00
Photon flux (15-150 keV) in 4.0000E-03 sec: 27.7496 ( -19.9485 41.3462 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13377e-08 ( -1.13377e-08 3.17352e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.004 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.918917 ( -14.9999 6.151199E-05) )
beta : -0.956041 ( -9.22202 10.7780 )
Epeak [keV] : 23.8024 ( -23.7024 9976.20 )
Norm@50keV : 0.265346 ( -9566.12 3.118511E+07) )
------------------------------------------------------------
Chi-Squared = 6.686288 using 59 PHA bins.
Reduced chi-squared = 0.1215689 for 55 degrees of freedom
Null hypothesis probability = 1.00
Photon flux (15-150 keV) in 4.0000E-03 sec: 27.7543 ( -27.7543 41.3467 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.14956e-09 ( -4.08012e-09 8.4624e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 0.004 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.777428 ( -3.77743 2.32970 )
Norm@50keV : 0.241443 ( -0.211132 0.225262 )
------------------------------------------------------------
Chi-Squared = 6.646019 using 59 PHA bins.
Reduced chi-squared = 0.1165968 for 57 degrees of freedom
Null hypothesis probability = 1.00
Photon flux (15-150 keV) in 4.0000E-03 sec: 27.8027 ( -20.0053 41.2892 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14539e-08 ( -1.14539e-08 3.17565e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.004 sec.
Parameters : value lower 90% higher 90%
Photon index: 0.684073 ( -3.66803 6.72064 )
Epeak [keV] : 427.681 ( -427.671 9572.32 )
Norm@50keV : 0.280289 ( -0.280289 294.494 )
------------------------------------------------------------
Chi-Squared = 6.652215 using 59 PHA bins.
but latest trial -40.3340 gives Chi-Squared = 5.36028
but latest trial 294.775 gives Chi-Squared = 3.11536
Reduced chi-squared = 0.1187896 for 56 degrees of freedom
Null hypothesis probability = 1.00
Photon flux (15-150 keV) in 4.0000E-03 sec: 27.7496 ( -19.9485 41.3462 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13377e-08 ( -1.13377e-08 3.17352e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.004 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.918917 ( -14.9999 6.151199E-05) )
beta : -0.956041 ( -9.22202 10.7780 )
Epeak [keV] : 23.8024 ( -23.7024 9976.20 )
Norm@50keV : 0.265346 ( -9566.12 3.118511E+07) )
------------------------------------------------------------
Chi-Squared = 6.686288 using 59 PHA bins.
Reduced chi-squared = 0.1215689 for 55 degrees of freedom
Null hypothesis probability = 1.00
Photon flux (15-150 keV) in 4.0000E-03 sec: 27.7543 ( -27.7543 41.3467 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.14956e-09 ( -4.08012e-09 8.4624e-09 ) ergs/cm2
Plot creation:
Sat May 2 06:08:01 EDT 2009