batgrbproduct Analysis for Trigger=362817
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): Wed Sep 16 13:48:51 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger362817/GCN5_download_cron
======================================================================
Trigger: 00362817 Segment: 000
BAT Trigger Time: 274771768.804 [s; MET]
Trigger Stop: 274771768.868 [s; MET]
UTC: 2009-09-16T05:29:23.714580 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 138.305900571023 Dec: 23.9807261963547 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.02
Image Trigger?: NO
Rate S/N Ratio: 8 [ if not an image trigger ]
Image S/N Ratio: 6.02
Flight Position: [ source = BAT ]
RA: 138.305900571023 Dec: 23.9807261963547 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 138.108244068256 Dec: 24.0047068655696 [deg; J2000]
{ 09h 12m 26.0s , +24d 00' 16.9" }
+/- 7.13365135585296 [arcmin] (estimated 90% radius based on SNR)
+/- 5.33788488320246 [arcmin] (formal 1-sigma fit error)
SNR: 1.83696722744265
Angular difference between Flight and Ground position is 10.929825 arcmin
Partial Coding Fraction: 0.4804688 [ including projection effects ]
Duration
T90: 0.0639999508857727 +/-
Measured from: 0
to: 0.0639999508857727 [s; relative to TRIGTIME]
T50: 0.0639999508857727 +/-
Measured from: 0
to: 0.0639999508857727 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0639999508857727 second)
Measured from: -2.98023223876953e-08
to: 0.0639999210834503 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0639999508857727 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.000351 -0.001795 0.006540 0.007592
0.002085 0.002091 0.002283 0.002282 [error]
Peak -0.000351 -0.001795 0.006540 0.007592
0.002085 0.002091 0.002283 0.002282 [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 9.23e-11 2.02e-10 3.47e-10 1.38e-09 6.67e-09 2.28e-10 erg/cm2
Error 4.56e-10 4.22e-10 3.95e-10 1.30e-09 1.06e-08 0.00e+00 erg/cm2
Peak flux Power-law 4.62e-02 5.50e-02 4.73e-02 6.77e-03 2.67e-01 1.95e-02 ph/cm2/s
Error 2.37e-01 1.20e-01 3.90e-01 3.87e-01 3.97e-01 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 9.21e-11 2.02e-10 3.47e-10 1.37e-09 9.50e-10 2.00e-09 erg/cm2
Error 4.55e-10 4.22e-10 3.95e-10 1.19e-08 1.30e-09 1.20e-08 erg/cm2
Peak flux Cutoff-PL 4.61e-02 5.50e-02 4.73e-02 6.30e-03 3.09e-01 2.01e-02 ph/cm2/s
Error 2.37e-01 1.21e-01 4.36e-01 3.86e-01 2.56e-01 0.00e+00 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 -2.132 0.000 - - 3.70e-05 0.00e+00 53.420 57
CPL -2.911 0.000 81.5 0.0 3.92e-02 0.00e+00 53.440 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -2.132 0.000 - - 3.70e-05 0.00e+00 53.420 57
CPL -2.911 0.000 81.5 0.0 3.92e-02 0.00e+00 53.440 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
138.1082 +24.0047 0.1052 42.6 -18.9 0.0082 1.8 TRIG_00362817
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.804 -8.804 (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: -2.13180 ( )
Norm@50keV : 3.69822E-05 ( )
------------------------------------------------------------
# Chi-Squared = 53.42 using 59 PHA bins.
# Reduced chi-squared = 0.9371 for 57 degrees of freedom
# Null hypothesis probability = 6.103070e-01
Photon flux (15-150 keV) in 0.064 sec: 1.94967E-02 ( -0.0194967 0.754901 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.28076e-10 ( -2.26665e-10 2.36705e-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: -2.91149 ( -1.3242 -1.3242 )
Epeak [keV] : 81.4592 ( -9993.4 -9993.4 )
Norm@50keV : 3.92389E-02 ( )
------------------------------------------------------------
# Chi-Squared = 53.44 using 59 PHA bins.
# Reduced chi-squared = 0.9543 for 56 degrees of freedom
# Null hypothesis probability = 5.723623e-01
Photon flux (15-150 keV) in 0.064 sec: 2.00809E-02 ( -0.0200809 0.752257 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.50438e-10 ( -9.50438e-10 1.65459e-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 : -0.361219 ( 0.312279 0.312279 )
beta : -1.47586 ( 1.49674 1.49674 )
Epeak [keV] : 114.410 ( -116.654 -116.654 )
Norm@50keV : 3.30304E-03 ( -0.00350575 1122.49 )
------------------------------------------------------------
# Chi-Squared = 53.45 using 59 PHA bins.
# Reduced chi-squared = 0.9719 for 55 degrees of freedom
# Null hypothesis probability = 5.339277e-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: -2.13180 ( )
Norm@50keV : 3.69822E-05 ( )
------------------------------------------------------------
# Chi-Squared = 53.42 using 59 PHA bins.
# Reduced chi-squared = 0.9371 for 57 degrees of freedom
# Null hypothesis probability = 6.103070e-01
Photon flux (15-150 keV) in 0.064 sec: 1.94967E-02 ( -0.0194967 0.754901 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.28076e-10 ( -2.26665e-10 2.36705e-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: -2.91149 ( -1.3242 -1.3242 )
Epeak [keV] : 81.4592 ( -9993.4 -9993.4 )
Norm@50keV : 3.92389E-02 ( )
------------------------------------------------------------
# Chi-Squared = 53.44 using 59 PHA bins.
# Reduced chi-squared = 0.9543 for 56 degrees of freedom
# Null hypothesis probability = 5.723623e-01
Photon flux (15-150 keV) in 0.064 sec: 2.00809E-02 ( -0.0200809 0.752257 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.50438e-10 ( -9.50438e-10 1.65459e-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 : -0.361219 ( 0.312279 0.312279 )
beta : -1.47586 ( 1.49674 1.49674 )
Epeak [keV] : 114.410 ( -116.654 -116.654 )
Norm@50keV : 3.30304E-03 ( -0.00350575 1122.49 )
------------------------------------------------------------
# Chi-Squared = 53.45 using 59 PHA bins.
# Reduced chi-squared = 0.9719 for 55 degrees of freedom
# Null hypothesis probability = 5.339277e-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:
Wed Sep 16 13:56:27 EDT 2009