batgrbproduct Analysis for Trigger=355920
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): Mon Jun 29 03:21:56 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger355920/GCN5_download_cron
======================================================================
Trigger: 00355920 Segment: 000
BAT Trigger Time: 267887283.84 [s; MET]
Trigger Stop: 267887283.904 [s; MET]
UTC: 2009-06-28T13:07:58.974680 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 42.4395703454709 Dec: 45.6566485252995 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.74
Image Trigger?: NO
Rate S/N Ratio: 7 [ if not an image trigger ]
Image S/N Ratio: 5.74
Flight Position: [ source = BAT ]
RA: 42.4395703454709 Dec: 45.6566485252995 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 42.5093321176753 Dec: 45.495602494337 [deg; J2000]
{ 02h 50m 02.2s , +45d 29' 44.2" }
+/- 7.2680238178299 [arcmin] (estimated 90% radius based on SNR)
+/- 6.23844156442289 [arcmin] (formal 1-sigma fit error)
SNR: 1.78864274746493
Angular difference between Flight and Ground position is 10.097171 arcmin
Partial Coding Fraction: 0.78125 [ 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 0.007893 -0.000100 -0.000712 -0.000380
0.001607 0.001337 0.001359 0.001300 [error]
Peak 0.007893 -0.000100 -0.000712 -0.000380
0.001607 0.001337 0.001359 0.001300 [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 9.80e-10 4.86e-10 1.48e-10 5.71e-11 1.65e-09 1.67e-09 erg/cm2
Error 6.28e-10 4.91e-10 2.60e-10 2.37e-10 1.23e-09 1.30e-09 erg/cm2
Peak flux Power-law 5.17e-01 1.46e-01 2.22e-02 3.85e-03 6.88e-01 6.89e-01 ph/cm2/s
Error 3.32e-01 1.44e-01 3.77e-02 1.44e-02 4.51e-01 4.57e-01 ph/cm2/s
Fluence Cutoff-PL 1.63e-09 6.65e-10 8.46e-12 1.87e-16 2.30e-09 2.28e-09 erg/cm2
Error 7.31e-10 5.56e-10 2.63e-11 3.05e-14 1.07e-09 1.08e-09 erg/cm2
Peak flux Cutoff-PL 5.17e-01 1.46e-01 2.22e-02 3.82e-03 6.88e-01 6.89e-01 ph/cm2/s
Error 3.32e-01 1.44e-01 3.77e-02 1.43e-02 4.52e-01 4.57e-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 3.713 1.453 - - 1.43e-03 1.93e-03 74.490 57
CPL 1.000 0.000 50.0 0.0 4.23e-03 0.00e+00 80.530 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.713 1.453 - - 1.43e-03 1.93e-03 74.490 57
CPL 1.000 0.000 50.0 0.0 4.23e-03 0.00e+00 80.530 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
42.5093 +45.4956 0.1073 24.4 -45.2 0.0048 1.8 TRIG_00355920
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.840 -3.840 (delta_t = 57.000 [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: 3.71267 ( -1.10957 1.79633 )
Norm@50keV : 1.42817E-03 ( -0.00142624 0.00243356 )
------------------------------------------------------------
# Chi-Squared = 74.49 using 59 PHA bins.
# Reduced chi-squared = 1.307 for 57 degrees of freedom
# Null hypothesis probability = 5.982424e-02
Photon flux (15-150 keV) in 0.064 sec: 0.688000 ( -0.449139 0.4519 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.64552e-09 ( -1.12266e-09 1.33354e-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: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 4.23354E-03 ( )
------------------------------------------------------------
# Chi-Squared = 80.53 using 59 PHA bins.
# Reduced chi-squared = 1.438 for 56 degrees of freedom
# Null hypothesis probability = 1.755890e-02
Photon flux (15-150 keV) in 0.064 sec: 0.687858 ( -0.44906 0.453932 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30177e-09 ( -1.06088e-09 1.08818e-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 : -9.34944 ( 5.83069 9.80128 )
beta : -3.71691 ( -1.79006 1.11345 )
Epeak [keV] : 9988.56 ( -1500.91 -1500.91 )
Norm@50keV : 0.193276 ( -0.193257 0.331059 )
------------------------------------------------------------
# Chi-Squared = 74.49 using 59 PHA bins.
# Reduced chi-squared = 1.354 for 55 degrees of freedom
# Null hypothesis probability = 4.118074e-02
Photon flux (15-150 keV) in 0.064 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 0.000 sec. to 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.71267 ( -1.10957 1.79633 )
Norm@50keV : 1.42817E-03 ( -0.00142624 0.00243356 )
------------------------------------------------------------
# Chi-Squared = 74.49 using 59 PHA bins.
# Reduced chi-squared = 1.307 for 57 degrees of freedom
# Null hypothesis probability = 5.982424e-02
Photon flux (15-150 keV) in 0.064 sec: 0.688000 ( -0.449139 0.4519 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.64552e-09 ( -1.12266e-09 1.33354e-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: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 4.23354E-03 ( )
------------------------------------------------------------
# Chi-Squared = 80.53 using 59 PHA bins.
# Reduced chi-squared = 1.438 for 56 degrees of freedom
# Null hypothesis probability = 1.755890e-02
Photon flux (15-150 keV) in 0.064 sec: 0.687858 ( -0.44906 0.454272 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30177e-09 ( -1.06088e-09 1.08818e-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 : -9.34944 ( 5.83069 9.80128 )
beta : -3.71691 ( -1.79006 1.11345 )
Epeak [keV] : 9988.56 ( -1500.91 -1500.91 )
Norm@50keV : 0.193276 ( -0.193257 0.331059 )
------------------------------------------------------------
# Chi-Squared = 74.49 using 59 PHA bins.
# Reduced chi-squared = 1.354 for 55 degrees of freedom
# Null hypothesis probability = 4.118074e-02
Photon flux (15-150 keV) in 0.064 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Mon Jun 29 03:35:12 EDT 2009