batgrbproduct Analysis for Trigger=355915
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 01:53:31 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger355915/GCN5_download_cron
======================================================================
Trigger: 00355915 Segment: 000
BAT Trigger Time: 267874934.04 [s; MET]
Trigger Stop: 267874934.104 [s; MET]
UTC: 2009-06-28T09:42:09.175080 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 170.653839855756 Dec: 61.8169103763556 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.66
Image Trigger?: NO
Rate S/N Ratio: 9.16515138991168 [ if not an image trigger ]
Image S/N Ratio: 5.66
Flight Position: [ source = BAT ]
RA: 170.653839855756 Dec: 61.8169103763556 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 170.590867165083 Dec: 61.7681143895358 [deg; J2000]
{ 11h 22m 21.8s , +61d 46' 05.2" }
+/- 4.62300867108439 [arcmin] (estimated 90% radius based on SNR)
+/- 2.32949015703133 [arcmin] (formal 1-sigma fit error)
SNR: 3.41370462046168
Angular difference between Flight and Ground position is 3.429464 arcmin
Partial Coding Fraction: 0.625 [ 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 0.000124 -0.001762 0.005324 0.009136
0.001827 0.001876 0.001822 0.002027 [error]
Peak 0.000124 -0.001762 0.005324 0.009136
0.001827 0.001876 0.001822 0.002027 [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 8.67e-11 3.74e-10 1.36e-09 1.75e-08 3.94e-09 1.92e-08 erg/cm2
Error 2.29e-10 5.51e-10 1.36e-09 3.66e-08 3.94e-09 3.70e-08 erg/cm2
Peak flux Power-law 4.25e-02 9.77e-02 1.78e-01 7.71e-01 4.84e-01 1.09e+00 ph/cm2/s
Error 1.15e-01 1.48e-01 1.82e-01 1.36e+00 5.31e-01 1.41e+00 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 1.28e-02 8.47e-02 2.72e-01 7.08e-01 0.00e+00 0.00e+00 ph/cm2/s
Error 7.96e-02 1.37e-01 2.61e-01 9.87e-01 0.00e+00 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 0.111 1.186 - - 3.64e-03 4.57e-03 66.240 57
CPL -4.989 0.000 123.0 135.0 5.66e-02 9.01e-02 64.590 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.111 1.186 - - 3.64e-03 4.57e-03 66.240 57
CPL -4.989 0.000 123.0 135.0 5.66e-02 9.01e-02 64.590 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
170.5909 +61.7681 0.0565 35.9 -152.1 0.0129 3.4 TRIG_00355915
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.040 -6.040 (delta_t = 54.000 [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: 0.111165 ( -0.150672 2.22112 )
Norm@50keV : 3.63819E-03 ( -0.0037041 0.00542853 )
------------------------------------------------------------
# Chi-Squared = 66.24 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 57 degrees of freedom
# Null hypothesis probability = 1.883590e-01
Photon flux (15-150 keV) in 0.064 sec: 0.483774 ( -0.483817 0.577225 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.94104e-09 ( -3.94104e-09 3.94245e-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: -4.98865 ( )
Epeak [keV] : 123.031 ( -62.641 207.442 )
Norm@50keV : 5.65919E-02 ( -0.056593 0.123541 )
------------------------------------------------------------
# Chi-Squared = 64.59 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 56 degrees of freedom
# Null hypothesis probability = 2.015356e-01
Photon flux (15-150 keV) in 0.064 sec: ( ) 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 : 4.38404 ( -10.2318 -0.93123 )
beta : -10.00000 ( 2.20421e+10 2.20421e+10 )
Epeak [keV] : 128.348 ( -66.6722 -127.773 )
Norm@50keV : 4.18943E-02 ( -0.0421894 0.105572 )
------------------------------------------------------------
# Chi-Squared = 64.65 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 55 degrees of freedom
# Null hypothesis probability = 1.752589e-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: 0.111165 ( -0.150672 2.22112 )
Norm@50keV : 3.63819E-03 ( -0.0037041 0.00542853 )
------------------------------------------------------------
# Chi-Squared = 66.24 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 57 degrees of freedom
# Null hypothesis probability = 1.883590e-01
Photon flux (15-150 keV) in 0.064 sec: 0.483774 ( -0.483817 0.577225 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.94104e-09 ( -3.94104e-09 3.94245e-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: -4.98865 ( )
Epeak [keV] : 123.031 ( -62.6414 207.442 )
Norm@50keV : 5.65919E-02 ( -0.056593 0.123541 )
------------------------------------------------------------
# Chi-Squared = 64.59 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 56 degrees of freedom
# Null hypothesis probability = 2.015356e-01
Photon flux (15-150 keV) in 0.064 sec: ( ) 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 : 4.38404 ( -10.2752 -0.93123 )
beta : -10.00000 ( 2.20421e+10 2.20421e+10 )
Epeak [keV] : 128.348 ( -66.6722 -127.773 )
Norm@50keV : 4.18943E-02 ( -0.0421894 0.105572 )
------------------------------------------------------------
# Chi-Squared = 64.65 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 55 degrees of freedom
# Null hypothesis probability = 1.752589e-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:
Mon Jun 29 02:02:49 EDT 2009