batgrbproduct Analysis for Trigger=356899
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): Fri Jul 10 00:36:30 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger356899/GCN5_download_cron
======================================================================
Trigger: 00356899 Segment: 000
BAT Trigger Time: 268827459.02 [s; MET]
Trigger Stop: 268827459.084 [s; MET]
UTC: 2009-07-09T10:17:34.124200 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 262.885421134947 Dec: 73.0450684139026 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.82
Image Trigger?: NO
Rate S/N Ratio: 8 [ if not an image trigger ]
Image S/N Ratio: 5.82
Flight Position: [ source = BAT ]
RA: 262.885421134947 Dec: 73.0450684139026 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 262.998673141134 Dec: 73.0745158330723 [deg; J2000]
{ 17h 31m 59.7s , +73d 04' 28.3" }
+/- 2.98806475116047 [arcmin] (estimated 90% radius based on SNR)
+/- 1.94574553179509 [arcmin] (formal 1-sigma fit error)
SNR: 6.36780568449038
Angular difference between Flight and Ground position is 2.653642 arcmin
Partial Coding Fraction: 1.015625 [ 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 0.002598 0.000057 0.006195 0.004864
0.001106 0.001286 0.001335 0.001392 [error]
Peak 0.002598 0.000057 0.006195 0.004864
0.001106 0.001286 0.001335 0.001392 [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 3.65e-10 4.89e-10 4.81e-10 8.49e-10 1.61e-09 2.18e-09 erg/cm2
Error 3.86e-10 4.26e-10 3.94e-10 1.08e-09 1.08e-09 1.40e-09 erg/cm2
Peak flux Power-law 1.86e-01 1.38e-01 6.77e-02 4.74e-02 4.14e-01 4.39e-01 ph/cm2/s
Error 1.99e-01 1.21e-01 5.54e-02 4.74e-02 3.33e-01 3.28e-01 ph/cm2/s
Fluence Cutoff-PL 1.66e-10 9.17e-10 1.25e-09 2.54e-09 0.00e+00 0.00e+00 erg/cm2
Error 2.91e-10 6.33e-10 7.34e-10 1.41e-09 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 7.96e-02 2.42e-01 1.81e-01 1.73e-02 5.18e-01 5.21e-01 ph/cm2/s
Error 1.48e-01 1.74e-01 1.08e-01 2.36e-02 3.26e-01 3.25e-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 2.024 1.109 - - 2.73e-03 2.25e-03 84.030 57
CPL -4.975 0.000 62.0 11.2 2.62e+00 2.18e+00 80.140 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.024 1.109 - - 2.73e-03 2.25e-03 84.030 57
CPL -4.975 0.000 62.0 11.2 2.62e+00 2.18e+00 80.140 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
262.9987 +73.0745 0.0302 9.1 152.7 0.0166 6.4 TRIG_00356899
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.020 -17.580 (delta_t = 42.440 [sec])
-16.020 -3.020 (delta_t = 13.000 [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: 2.02368 ( -1.41138 0.807538 )
Norm@50keV : 2.72779E-03 ( -0.00272777 0.0017728 )
------------------------------------------------------------
# Chi-Squared = 84.03 using 59 PHA bins.
# Reduced chi-squared = 1.474 for 57 degrees of freedom
# Null hypothesis probability = 1.143031e-02
Photon flux (15-150 keV) in 0.064 sec: 0.413693 ( -0.328285 0.336833 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.61212e-09 ( -1.08561e-09 1.0759e-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: -4.97497 ( )
Epeak [keV] : 61.9815 ( -10.4907 11.9034 )
Norm@50keV : 2.62201 ( -2.55239 1.81253 )
------------------------------------------------------------
# Chi-Squared = 80.14 using 59 PHA bins.
# Reduced chi-squared = 1.431 for 56 degrees of freedom
# Null hypothesis probability = 1.886042e-02
Photon flux (15-150 keV) in 0.064 sec: 0.518194 ( -0.318813 0.333245 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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 : 4.99961 ( -4965.01 -4950.01 )
beta : -8.18228 ( 6.06951 15.0731 )
Epeak [keV] : 60.1451 ( -13.0233 12.3923 )
Norm@50keV : 3.38012 ( -2.40623 7.96483 )
------------------------------------------------------------
# Chi-Squared = 80.22 using 59 PHA bins.
# Reduced chi-squared = 1.459 for 55 degrees of freedom
# Null hypothesis probability = 1.485910e-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: 2.02368 ( -1.41138 0.807538 )
Norm@50keV : 2.72779E-03 ( -0.00272777 0.0017728 )
------------------------------------------------------------
# Chi-Squared = 84.03 using 59 PHA bins.
# Reduced chi-squared = 1.474 for 57 degrees of freedom
# Null hypothesis probability = 1.143031e-02
Photon flux (15-150 keV) in 0.064 sec: 0.413693 ( -0.328285 0.336833 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.61212e-09 ( -1.08561e-09 1.0759e-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: -4.97497 ( )
Epeak [keV] : 61.9815 ( -10.4907 11.9034 )
Norm@50keV : 2.62201 ( -2.55239 1.81253 )
------------------------------------------------------------
# Chi-Squared = 80.14 using 59 PHA bins.
# Reduced chi-squared = 1.431 for 56 degrees of freedom
# Null hypothesis probability = 1.886042e-02
Photon flux (15-150 keV) in 0.064 sec: 0.518194 ( -0.318813 0.333245 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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 : 4.99961 ( -4965.01 -4950.01 )
beta : -8.18228 ( 6.06951 15.0731 )
Epeak [keV] : 60.1451 ( -13.0233 12.3923 )
Norm@50keV : 3.38012 ( -2.40623 7.96483 )
------------------------------------------------------------
# Chi-Squared = 80.22 using 59 PHA bins.
# Reduced chi-squared = 1.459 for 55 degrees of freedom
# Null hypothesis probability = 1.485910e-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:
Fri Jul 10 00:42:48 EDT 2009