batgrbproduct Analysis for Trigger=345396
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): Fri Mar 6 14:18:38 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger345396/GCN5_download_cron
======================================================================
Trigger: 00345396 Segment: 000
BAT Trigger Time: 258040469 [s; MET]
Trigger Stop: 258040469.064 [s; MET]
UTC: 2009-03-06T13:54:24.447540 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 16.7400341494282 Dec: -50.0652286349102 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.58
Image Trigger?: NO
Rate S/N Ratio: 8.71779788708135 [ if not an image trigger ]
Image S/N Ratio: 5.58
Flight Position: [ source = BAT ]
RA: 16.7400341494282 Dec: -50.0652286349102 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 16.793075456536 Dec: -50.1249509859768 [deg; J2000]
{ 01h 07m 10.3s , -50d 07' 29.8" }
+/- 4.25095065209629 [arcmin] (estimated 90% radius based on SNR)
+/- 2.60574051796624 [arcmin] (formal 1-sigma fit error)
SNR: 3.84840833459454
Angular difference between Flight and Ground position is 4.124136 arcmin
Partial Coding Fraction: 0.703125 [ 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 -0.001498 -0.000140 0.006675 0.005205
0.001553 0.001644 0.001623 0.001850 [error]
Peak -0.001498 -0.000140 0.006675 0.005205
0.001553 0.001644 0.001623 0.001850 [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 7.72e-11 4.72e-10 2.52e-09 6.07e-08 8.21e-09 4.34e-08 erg/cm2
Error 1.43e-10 5.33e-10 1.93e-09 7.77e-08 3.74e-09 0.00e+00 erg/cm2
Peak flux Power-law 3.74e-02 1.21e-01 3.22e-01 2.51e+00 8.80e-01 2.99e+00 ph/cm2/s
Error 7.02e-02 1.40e-01 2.46e-01 2.97e+00 6.79e-01 2.47e+00 ph/cm2/s
Fluence Cutoff-PL 3.43e-11 4.72e-10 3.38e-09 1.24e-08 8.72e-09 1.65e-08 erg/cm2
Error 7.59e-11 5.14e-10 1.30e-09 4.68e-08 3.94e-09 4.65e-08 erg/cm2
Peak flux Cutoff-PL 1.74e-02 1.23e-01 4.39e-01 7.16e-01 9.50e-01 1.28e+00 ph/cm2/s
Error 3.93e-02 1.30e-01 2.25e-01 1.04e+00 4.22e-01 1.79e+00 ph/cm2/s
Fluence Band 2.22e-11 4.45e-10 3.72e-09 7.62e-09 8.63e-09 1.29e-08 erg/cm2
Error 1.73e-09 1.44e-08 3.75e-09 1.26e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 7.17e-03 9.63e-02 4.59e-01 5.79e-01 9.26e-01 1.07e+00 ph/cm2/s
Error 1.84e-02 1.87e-01 1.98e+00 3.99e-01 1.76e+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 -0.414 1.203 - - 5.47e-03 5.18e-03 48.542 57
CPL -0.437 1.136 9997.6 5000.0 5.54e-03 5.24e-03 48.510 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.414 1.203 - - 5.47e-03 5.18e-03 48.542 57
CPL -0.437 1.136 9997.6 5000.0 5.54e-03 5.24e-03 48.510 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
16.7931 -50.1250 0.0499 34.0 -5.9 0.0123 3.8 TRIG_00345396
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.000 -5.000 (delta_t = 55.000 [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: -0.413542 ( -1.51234 0.893307 )
Norm@50keV : 5.474539E-03 ( -5.474539E-03 4.894226E-03) )
------------------------------------------------------------
Chi-Squared = 48.54176 using 59 PHA bins.
Reduced chi-squared = 0.8516098 for 57 degrees of freedom
Null hypothesis probability = 0.780
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.879913 ( -0.879913 0.477237 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.20973e-09 ( -3.57645e-09 3.90093e-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: -0.437366 ( -1.36925 0.902529 )
Epeak [keV] : 9997.56 ( -9997.55 2.43652 )
Norm@50keV : 5.542739E-03 ( -5.542739E-03 4.928112E-03) )
------------------------------------------------------------
Chi-Squared = 48.51023 using 59 PHA bins.
Reduced chi-squared = 0.8662542 for 56 degrees of freedom
Null hypothesis probability = 0.751
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.949911 ( -0.421534 0.422299 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.72416e-09 ( -3.91278e-09 3.97638e-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 : -0.900477 ( -14.9999 6.437302E-05) )
beta : 0.414996 ( -1.24057 9.50660 )
Epeak [keV] : 36.7741 ( -111.463 9888.43 )
Norm@50keV : 6.333009E-03 ( -0.120525 501.852 )
------------------------------------------------------------
Chi-Squared = 48.54177 using 59 PHA bins.
Reduced chi-squared = 0.8825776 for 55 degrees of freedom
Null hypothesis probability = 0.718
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.925788 ( -0.394575 0.402972 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.63014e-09 ( -3.6772e-09 3.82272e-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: -0.413542 ( -1.51234 0.893307 )
Norm@50keV : 5.474539E-03 ( -5.474539E-03 4.894226E-03) )
------------------------------------------------------------
Chi-Squared = 48.54176 using 59 PHA bins.
Reduced chi-squared = 0.8516098 for 57 degrees of freedom
Null hypothesis probability = 0.780
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.879913 ( -0.879913 0.477237 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.20973e-09 ( -3.57645e-09 3.90093e-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: -0.437366 ( -1.36925 0.902529 )
Epeak [keV] : 9997.56 ( -9997.55 2.43652 )
Norm@50keV : 5.542739E-03 ( -5.542739E-03 4.928112E-03) )
------------------------------------------------------------
Chi-Squared = 48.51023 using 59 PHA bins.
Reduced chi-squared = 0.8662542 for 56 degrees of freedom
Null hypothesis probability = 0.751
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.949911 ( -0.421534 0.422299 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.72416e-09 ( -3.91278e-09 3.97638e-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 : -0.900477 ( -14.9999 6.437302E-05) )
beta : 0.414996 ( -1.24057 9.50660 )
Epeak [keV] : 36.7741 ( -111.463 9888.42 )
Norm@50keV : 6.333009E-03 ( -0.120525 501.852 )
------------------------------------------------------------
Chi-Squared = 48.54177 using 59 PHA bins.
Reduced chi-squared = 0.8825776 for 55 degrees of freedom
Null hypothesis probability = 0.718
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.925788 ( -0.394575 0.402972 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.63014e-09 ( -3.6772e-09 3.82272e-09 ) ergs/cm2
Plot creation:
Fri Mar 6 14:28:09 EST 2009