batgrbproduct Analysis for Trigger=344462
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): Sat Feb 28 12:02:21 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger344462/GCN5_download_cron
======================================================================
Trigger: 00344462 Segment: 000
BAT Trigger Time: 257471980.192 [s; MET]
Trigger Stop: 257471980.256 [s; MET]
UTC: 2009-02-27T23:59:35.657440 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 266.086829169129 Dec: -8.24116350238522 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.54
Image Trigger?: NO
Rate S/N Ratio: 8.12403840463596 [ if not an image trigger ]
Image S/N Ratio: 5.54
Flight Position: [ source = BAT ]
RA: 266.086829169129 Dec: -8.24116350238522 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 266.178790197183 Dec: -8.24856180066342 [deg; J2000]
{ 17h 44m 42.9s , -08d 14' 54.8" }
+/- 4.83998532255597 [arcmin] (estimated 90% radius based on SNR)
+/- 3.27372052623516 [arcmin] (formal 1-sigma fit error)
SNR: 3.19719956197877
Angular difference between Flight and Ground position is 5.478645 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
T50: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0640000104904175 second)
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.001226 -0.000167 0.003935 0.008576
0.001655 0.001507 0.001390 0.001633 [error]
Peak -0.001226 -0.000167 0.003935 0.008576
0.001655 0.001507 0.001390 0.001633 [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 1.70e-11 1.61e-10 1.41e-09 7.87e-08 5.66e-09 2.97e-08 erg/cm2
Error 1.07e-10 3.83e-10 1.32e-09 6.49e-08 4.51e-09 0.00e+00 erg/cm2
Peak flux Power-law 7.85e-03 4.01e-02 1.76e-01 3.07e+00 5.37e-01 3.30e+00 ph/cm2/s
Error 5.28e-02 1.01e-01 1.78e-01 2.70e+00 4.80e-01 2.67e+00 ph/cm2/s
Fluence Cutoff-PL 1.62e-11 1.62e-10 1.45e-09 8.45e-08 5.69e-09 3.27e-08 erg/cm2
Error 1.07e-10 3.83e-10 1.47e-09 8.43e-08 4.52e-09 0.00e+00 erg/cm2
Peak flux Cutoff-PL 6.36e-03 3.82e-02 1.74e-01 3.20e+00 5.38e-01 3.24e+00 ph/cm2/s
Error 5.25e-02 1.01e-01 1.94e-01 4.13e+00 4.80e-01 3.44e+00 ph/cm2/s
Fluence Band 1.16e-12 4.27e-11 1.41e-09 8.05e-08 5.78e-09 1.97e-08 erg/cm2
Error 1.56e-09 1.73e-07 4.55e-09 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.27e-02 3.76e+00 1.65e+01 2.88e+02 5.04e+01 3.88e+00 ph/cm2/s
Error 3.91e+00 1.71e+01 3.12e+02 5.26e+01 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 -1.132 1.528 - - 2.22e-03 3.68e-03 65.277 57
CPL -1.290 1.772 9992.0 5000.0 2.07e-03 3.70e-03 65.255 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -1.132 1.528 - - 2.22e-03 3.68e-03 65.277 57
CPL -1.290 1.772 9992.0 5000.0 2.07e-03 3.70e-03 65.255 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 0.064 0.000 0.064
T90 0.064 0.000 0.064
T50 0.064 0.000 0.064
Peak 0.064 0.000 0.064
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
266.1788 -8.2486 0.0603 22.1 -178.6 0.0095 3.2 TRIG_00344462
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.192 -4.192 (delta_t = 56.000 [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 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.13243 ( -1.36576 1.68971 )
Norm@50keV : 2.217870E-03 ( -2.217870E-03 5.137256E-03) )
------------------------------------------------------------
Chi-Squared = 65.27735 using 59 PHA bins.
Reduced chi-squared = 1.145217 for 57 degrees of freedom
Null hypothesis probability = 0.211
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.536940 ( -0.53694 0.423868 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.66347e-09 ( -5.66347e-09 3.35247e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.28973 ( -1.71027 1.83286 )
Epeak [keV] : 9991.98 ( -9991.97 8.02148 )
Norm@50keV : 2.066312E-03 ( -2.066312E-03 5.339208E-03) )
------------------------------------------------------------
Chi-Squared = 65.25533 using 59 PHA bins.
Reduced chi-squared = 1.165274 for 56 degrees of freedom
Null hypothesis probability = 0.186
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.537700 ( -0.5377 0.421931 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.68852e-09 ( -5.68852e-09 3.35961e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.510250 ( -10.5103 4.48975 )
beta : 1.14695 ( -11.1469 1.35019 )
Epeak [keV] : 19.5296 ( -19.4296 9980.47 )
Norm@50keV : 4.127172E-03 ( -4.127172E-03 74439.1 )
------------------------------------------------------------
Chi-Squared = 65.27754 using 59 PHA bins.
Reduced chi-squared = 1.186864 for 55 degrees of freedom
Null hypothesis probability = 0.162
Photon flux (15-150 keV) in 6.4000E-02 sec: 50.3574 ( -50.3574 54.8026 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.78081e-09 ( -5.78081e-09 3.31071e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.13243 ( -1.36576 1.68971 )
Norm@50keV : 2.217870E-03 ( -2.217870E-03 5.137256E-03) )
------------------------------------------------------------
Chi-Squared = 65.27735 using 59 PHA bins.
Reduced chi-squared = 1.145217 for 57 degrees of freedom
Null hypothesis probability = 0.211
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.536940 ( -0.53694 0.423868 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.66347e-09 ( -5.66347e-09 3.35247e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.28973 ( -1.71027 1.83286 )
Epeak [keV] : 9991.98 ( -9991.97 8.02148 )
Norm@50keV : 2.066312E-03 ( -2.066312E-03 5.339208E-03) )
------------------------------------------------------------
Chi-Squared = 65.25533 using 59 PHA bins.
Reduced chi-squared = 1.165274 for 56 degrees of freedom
Null hypothesis probability = 0.186
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.537700 ( -0.5377 0.421931 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.68852e-09 ( -5.68852e-09 3.35961e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.510250 ( -10.5103 4.48975 )
beta : 1.14695 ( -11.1469 1.35098 )
Epeak [keV] : 19.5296 ( -19.4296 9980.47 )
Norm@50keV : 4.127172E-03 ( -4.127172E-03 74439.1 )
------------------------------------------------------------
Chi-Squared = 65.27754 using 59 PHA bins.
Reduced chi-squared = 1.186864 for 55 degrees of freedom
Null hypothesis probability = 0.162
Photon flux (15-150 keV) in 6.4000E-02 sec: 50.3574 ( -50.3574 54.8026 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.78081e-09 ( -5.78081e-09 3.31071e-09 ) ergs/cm2
Plot creation:
Sat Feb 28 12:15:21 EST 2009