batgrbproduct Analysis for Trigger=354777
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): Sat Jun 13 12:25:46 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger354777/GCN5_download_cron
======================================================================
Trigger: 00354777 Segment: 000
BAT Trigger Time: 266530628.928 [s; MET]
Trigger Stop: 266530628.992 [s; MET]
UTC: 2009-06-12T20:17:04.106400 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 87.2580610341718 Dec: -74.1364790739499 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.94
Image Trigger?: NO
Rate S/N Ratio: 6.16441400296898 [ if not an image trigger ]
Image S/N Ratio: 5.94
Flight Position: [ source = BAT ]
RA: 87.2580610341718 Dec: -74.1364790739499 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 87.2603567151453 Dec: -74.1409344627376 [deg; J2000]
{ 05h 49m 02.5s , -74d 08' 27.4" }
+/- 3.68345038452477 [arcmin] (estimated 90% radius based on SNR)
+/- 1.99376035900762 [arcmin] (formal 1-sigma fit error)
SNR: 4.72261907165931
Angular difference between Flight and Ground position is 0.269961 arcmin
Partial Coding Fraction: 0.8203125 [ 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 0.001009 0.003436 0.007731 0.000575
0.001436 0.001639 0.001608 0.001284 [error]
Peak 0.001009 0.003436 0.007731 0.000575
0.001436 0.001639 0.001608 0.001284 [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 6.26e-10 1.26e-09 2.01e-09 7.18e-09 5.59e-09 1.07e-08 erg/cm2
Error 4.60e-10 6.53e-10 1.04e-09 8.45e-09 2.74e-09 8.29e-09 erg/cm2
Peak flux Power-law 3.15e-01 3.47e-01 2.76e-01 3.66e-01 1.07e+00 1.29e+00 ph/cm2/s
Error 2.34e-01 1.82e-01 1.40e-01 3.44e-01 5.24e-01 6.19e-01 ph/cm2/s
Fluence Cutoff-PL 2.90e-10 1.75e-09 2.81e-09 6.08e-10 5.40e-09 5.45e-09 erg/cm2
Error 3.42e-10 8.66e-10 1.03e-09 1.23e-09 2.19e-09 2.32e-09 erg/cm2
Peak flux Cutoff-PL 1.36e-01 4.55e-01 4.05e-01 5.08e-02 1.04e+00 1.05e+00 ph/cm2/s
Error 1.68e-01 2.32e-01 1.82e-01 8.85e-02 4.13e-01 4.16e-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 1.08e+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 1.358 0.675 - - 8.91e-03 4.21e-03 70.900 57
CPL -4.973 0.000 60.9 14.6 5.51e+00 3.73e+00 63.610 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.358 0.675 - - 8.91e-03 4.21e-03 70.900 57
CPL -4.973 0.000 60.9 14.6 5.51e+00 3.73e+00 63.610 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
87.2604 -74.1409 0.0408 29.9 -155.5 0.0140 4.7 TRIG_00354777
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.928 -57.563 (delta_t = 3.365 [sec])
-56.928 -4.928 (delta_t = 52.000 [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: 1.35807 ( -0.660985 0.689673 )
Norm@50keV : 8.90988E-03 ( -0.00422659 0.00418743 )
------------------------------------------------------------
# Chi-Squared = 70.90 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 57 degrees of freedom
# Null hypothesis probability = 1.020524e-01
Photon flux (15-150 keV) in 0.064 sec: 1.06555 ( -0.517383 0.529924 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.59075e-09 ( -2.70879e-09 2.76534e-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: -4.97287 ( )
Epeak [keV] : 60.8854 ( -13.011 16.1415 )
Norm@50keV : 5.51201 ( -5.10847 2.3518 )
------------------------------------------------------------
# Chi-Squared = 63.61 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 56 degrees of freedom
# Null hypothesis probability = 2.262575e-01
Photon flux (15-150 keV) in 0.064 sec: 1.04444 ( -0.400362 0.42635 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.40062e-09 ( -2.12148e-09 2.25839e-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 : 4.98809 ( -172.406 -162.406 )
beta : -9.99965 ( 9178.28 9188.28 )
Epeak [keV] : 60.8231 ( -12.9521 16.1477 )
Norm@50keV : 5.61938 ( -4.29919 17.8555 )
------------------------------------------------------------
# Chi-Squared = 63.61 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 55 degrees of freedom
# Null hypothesis probability = 1.991885e-01
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: 1.35807 ( -0.660985 0.689673 )
Norm@50keV : 8.90988E-03 ( -0.00422659 0.00418743 )
------------------------------------------------------------
# Chi-Squared = 70.90 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 57 degrees of freedom
# Null hypothesis probability = 1.020524e-01
Photon flux (15-150 keV) in 0.064 sec: 1.06555 ( -0.517383 0.529924 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.59075e-09 ( -2.70879e-09 2.76534e-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: -4.97287 ( )
Epeak [keV] : 60.8854 ( -13.011 16.1415 )
Norm@50keV : 5.51201 ( -5.10847 2.3518 )
------------------------------------------------------------
# Chi-Squared = 63.61 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 56 degrees of freedom
# Null hypothesis probability = 2.262575e-01
Photon flux (15-150 keV) in 0.064 sec: 1.04444 ( -0.400362 0.42635 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.40062e-09 ( -2.12148e-09 2.25839e-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 : 4.98809 ( -172.406 -162.406 )
beta : -9.99965 ( 9178.28 9188.28 )
Epeak [keV] : 60.8231 ( -12.9521 16.1477 )
Norm@50keV : 5.61938 ( -4.29919 17.8555 )
------------------------------------------------------------
# Chi-Squared = 63.61 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 55 degrees of freedom
# Null hypothesis probability = 1.991885e-01
Photon flux (15-150 keV) in 0.064 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sat Jun 13 12:38:12 EDT 2009