batgrbproduct Analysis for Trigger=381591
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): Thu Dec 31 20:00:49 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger381591/GCN5_download_cron
======================================================================
Trigger: 00381591 Segment: 000
BAT Trigger Time: 283974262.848 [s; MET]
Trigger Stop: 283974279.232 [s; MET]
UTC: 2009-12-31T17:44:17.450720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 235.079216103307 Dec: -8.73771854118322 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.25
Image Trigger?: NO
Rate S/N Ratio: 12.6095202129185 [ if not an image trigger ]
Image S/N Ratio: 7.25
Flight Position: [ source = BAT ]
RA: 235.079216103307 Dec: -8.73771854118322 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 235.135201447304 Dec: -8.78435230469922 [deg; J2000]
{ 15h 40m 32.4s , -08d 47' 03.7" }
+/- 3.43170437773798 [arcmin] (estimated 90% radius based on SNR)
+/- 2.10533762296649 [arcmin] (formal 1-sigma fit error)
SNR: 5.22521640639059
Angular difference between Flight and Ground position is 4.341758 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 65 +/- 23.8537208837531
Measured from: -20.8479998707771
to: 44.1520001292229 [s; relative to TRIGTIME]
T50: 30 +/- 22.2036033111745
Measured from: -6.84799987077713
to: 23.1520001292229 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 44.1520000100136
to: 45.1520000100136 [s; relative to TRIGTIME]
Total Fluence
Measured from: -21.8479999899864
to: 45.1520000100136 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.293261 0.123496 0.096529 0.081376
0.054136 0.044539 0.039050 0.035191 [error]
Peak 0.019333 0.012933 -0.000389 0.006277
0.006550 0.005548 0.004750 0.004209 [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 6.81e-08 6.79e-08 4.76e-08 5.28e-08 2.05e-07 2.36e-07 erg/cm2
Error 2.47e-08 2.30e-08 3.41e-08 8.19e-08 7.62e-08 1.27e-07 erg/cm2
Peak flux Power-law 2.34e-01 5.43e-02 6.46e-03 8.53e-04 2.96e-01 2.96e-01 ph/cm2/s
Error 9.67e-02 4.70e-02 1.43e-02 5.20e-03 1.30e-01 1.31e-01 ph/cm2/s
Fluence Cutoff-PL 6.81e-08 6.80e-08 4.76e-08 5.23e-08 2.04e-07 2.36e-07 erg/cm2
Error 2.47e-08 2.30e-08 3.41e-08 8.12e-08 7.62e-08 1.26e-07 erg/cm2
Peak flux Cutoff-PL 2.34e-01 5.43e-02 6.44e-03 8.46e-04 2.96e-01 2.96e-01 ph/cm2/s
Error 9.66e-02 4.70e-02 1.42e-02 5.16e-03 1.30e-01 1.31e-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 2.513 0.754 - - 3.04e-04 1.56e-04 59.200 57
CPL 1.864 0.000 8.7 0.0 7.14e-04 0.00e+00 60.120 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.072 1.796 - - 4.50e-04 7.27e-04 64.310 57
CPL 1.000 0.000 50.0 0.0 4.59e-03 0.00e+00 73.330 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 67.000 -21.848 45.152
T90 65.000 -20.848 44.152
T50 30.000 -6.848 23.152
Peak 1.000 44.152 45.152
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
235.1352 -8.7844 0.0369 14.2 -27.9 0.5377 5.2 TRIG_00381591
------------------------------------------
Foreground time interval of the image:
-21.848 45.152 (delta_t = 67.000 [sec])
Background time interval of the image:
-239.848 -21.848 (delta_t = 218.000 [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 -21.848 sec. to 45.152 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.51334 ( -0.670074 0.838005 )
Norm@50keV : 3.04143E-04 ( -0.000156227 0.000156176 )
------------------------------------------------------------
# Chi-Squared = 59.20 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 57 degrees of freedom
# Null hypothesis probability = 3.950660e-01
Photon flux (15-150 keV) in 67 sec: 6.02476E-02 ( -0.016604 0.0166051 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.04517e-07 ( -7.14059e-08 8.09608e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -21.848 sec. to 45.152 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86389 ( )
Epeak [keV] : 8.72977 ( )
Norm@50keV : 7.13907E-04 ( )
------------------------------------------------------------
# Chi-Squared = 60.12 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 56 degrees of freedom
# Null hypothesis probability = 3.291062e-01
Photon flux (15-150 keV) in 67 sec: 6.02188E-02 ( -0.0165973 0.0165987 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.04439e-07 ( -7.13798e-08 8.094e-08 ) ergs/cm2
Band function
Time interval is from -21.848 sec. to 45.152 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59768 ( 1.59773 1.59773 )
beta : -2.53143 ( 2.53346 0.68316 )
Epeak [keV] : 8.22496 ( -8.20129 50.8085 )
Norm@50keV : 1.88565E-03 ( -0.0018957 21.6914 )
------------------------------------------------------------
# Chi-Squared = 59.14 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 55 degrees of freedom
# Null hypothesis probability = 3.267928e-01
Photon flux (15-150 keV) in 67 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 44.152 sec. to 45.152 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.07205 ( -1.32832 2.26452 )
Norm@50keV : 4.50172E-04 ( -0.000450172 0.00100399 )
------------------------------------------------------------
# Chi-Squared = 64.31 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 57 degrees of freedom
# Null hypothesis probability = 2.359713e-01
Photon flux (15-150 keV) in 1 sec: 0.295706 ( -0.129424 0.131497 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04548e-08 ( -5.27814e-09 6.70468e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 44.152 sec. to 45.152 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 4.59059E-03 ( )
------------------------------------------------------------
# Chi-Squared = 73.33 using 59 PHA bins.
# Reduced chi-squared = 1.309 for 56 degrees of freedom
# Null hypothesis probability = 5.997745e-02
Photon flux (15-150 keV) in 1 sec: 0.295523 ( -0.129388 0.131455 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.64747e-09 ( -4.64132e-09 7.36233e-09 ) ergs/cm2
Band function
Time interval is from 44.152 sec. to 45.152 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.55010 ( 3.28998 5.96433 )
beta : -4.07278 ( -2.26558 1.32954 )
Epeak [keV] : 430.306 ( -430.306 -430.306 )
Norm@50keV : 6.11404E-02 ( -0.0611848 0.136436 )
------------------------------------------------------------
# Chi-Squared = 64.31 using 59 PHA bins.
# Reduced chi-squared = 1.169 for 55 degrees of freedom
# Null hypothesis probability = 1.827676e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Thu Dec 31 20:30:32 EST 2009