batgrbproduct Analysis for Trigger=346386
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 v2.42
Process Start Time (local time): Fri Mar 13 14:21:10 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger346386/GCN5_download_cron
======================================================================
Trigger: 00346386 Segment: 000
BAT Trigger Time: 258627992 [s; MET]
Trigger Stop: 258628056 [s; MET]
UTC: 2009-03-13T09:06:27.429120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 198.396961251434 Dec: 8.10658701409268 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.12
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.12
Flight Position: [ source = BAT ]
RA: 198.396961251434 Dec: 8.10658701409268 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 198.400207553082 Dec: 8.08631230759155 [deg; J2000]
{ 13h 13m 36.0s , +08d 05' 10.7" }
+/- 2.17820711473199 [arcmin] (estimated 90% radius based on SNR)
+/- 0.914148175233534 [arcmin] (formal 1-sigma fit error)
SNR: 10.0027534067998
Angular difference between Flight and Ground position is 1.231672 arcmin
Partial Coding Fraction: 0.1523438 [ including projection effects ]
Duration
T90: 78.3199999928474 +/- 18.5772781539019
Measured from: -17.4159999191761
to: 60.9040000736713 [s; relative to TRIGTIME]
T50: 35.6639999747276 +/- 11.6276773127863
Measured from: 1.11200007796288
to: 36.7760000526905 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.86000001430511
to: 5.86000001430511 [s; relative to TRIGTIME]
Total Fluence
Measured from: -21.2560000121593
to: 66.6480000019073 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.879004 0.939413 0.586542 0.148250
0.125918 0.122761 0.108138 0.095361 [error]
Peak 0.033915 0.038639 0.013252 0.030864
0.014149 0.013705 0.011404 0.010784 [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 2.81e-07 4.02e-07 4.29e-07 8.51e-07 1.38e-06 1.95e-06 erg/cm2
Error 6.24e-08 5.91e-08 1.06e-07 4.28e-07 2.41e-07 5.33e-07 erg/cm2
Peak flux Power-law 3.43e-01 2.56e-01 1.27e-01 8.99e-02 7.68e-01 8.16e-01 ph/cm2/s
Error 2.32e-01 1.09e-01 1.10e-01 1.50e-01 3.33e-01 3.48e-01 ph/cm2/s
Fluence Cutoff-PL 2.77e-07 4.08e-07 4.31e-07 7.03e-07 1.36e-06 1.82e-06 erg/cm2
Error 6.92e-08 7.09e-08 1.08e-07 5.14e-07 2.55e-07 6.84e-07 erg/cm2
Peak flux Cutoff-PL 3.43e-01 2.56e-01 1.27e-01 8.93e-02 7.68e-01 8.15e-01 ph/cm2/s
Error 2.32e-01 1.09e-01 1.10e-01 1.49e-01 3.33e-01 3.48e-01 ph/cm2/s
Fluence Band 2.74e-07 4.06e-07 4.30e-07 6.99e-07 1.36e-06 1.85e-06 erg/cm2
Error 6.85e-08 7.06e-08 1.09e-07 6.66e-07 2.58e-07 4.63e-07 erg/cm2
Peak flux Band 2.84e-01 2.53e-01 1.39e-01 8.99e-02 7.68e-01 8.14e-01 ph/cm2/s
Error 2.03e-01 1.08e-01 6.82e-02 3.83e-02 3.30e-01 3.51e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.907 0.287 - - 1.70e-03 3.03e-04 48.460 57
CPL 1.797 0.847 85.4 5000.0 1.95e-03 4.21e-03 48.425 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.010 1.104 - - 5.10e-03 2.95e-03 65.459 57
CPL 2.009 1.109 9997.2 1.4 5.10e-03 2.96e-03 65.459 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 87.904 -21.256 66.648
T90 78.320 -17.416 60.904
T50 35.664 1.112 36.776
Peak 1.000 4.860 5.860
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
198.4002 +8.0863 0.0193 36.0 97.5 2.3839 10.0 TRIG_00346386
------------------------------------------
Foreground time interval of the image:
-9.799 66.648 (delta_t = 76.447 [sec])
Background time interval of the image:
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 -21.256 sec. to 66.648 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.90670 ( -0.275332 0.297800 )
Norm@50keV : 1.702751E-03 ( -3.091864E-04 2.972289E-04) )
------------------------------------------------------------
Chi-Squared = 48.45963 using 59 PHA bins.
Reduced chi-squared = 0.8501689 for 57 degrees of freedom
Null hypothesis probability = 0.782
Photon flux (15-150 keV) in 87.90 sec: 0.245060 ( -0.036308 0.036352 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37634e-06 ( -2.38983e-07 2.43993e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -21.256 sec. to 66.648 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79662 ( -1.18964 0.504096 )
Epeak [keV] : 85.3645 ( -85.3545 9914.64 )
Norm@50keV : 1.953110E-03 ( -1.953110E-03 6.469452E-03) )
------------------------------------------------------------
Chi-Squared = 48.42492 using 59 PHA bins.
but latest trial 2.29558 gives Chi-Squared = 0.191681
Reduced chi-squared = 0.8647307 for 56 degrees of freedom
Null hypothesis probability = 0.754
Photon flux (15-150 keV) in 87.90 sec: 0.243866 ( -0.035824 0.037052 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36438e-06 ( -2.61379e-07 2.48968e-07 ) ergs/cm2
Band function
Time interval is from -21.256 sec. to 66.648 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.68958 ( -8.31042 1.07092 )
beta : -9.07095 ( -0.929045 7.43958 )
Epeak [keV] : 66.7968 ( -173.232 9826.67 )
Norm@50keV : 2.213581E-03 ( -3.707679E-04 6.706240E-03) )
------------------------------------------------------------
Chi-Squared = 48.45689 using 59 PHA bins.
Reduced chi-squared = 0.8810343 for 55 degrees of freedom
Null hypothesis probability = 0.721
Photon flux (15-150 keV) in 87.90 sec: 0.243866 ( -0.037834 0.037207 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36243e-06 ( -2.61054e-07 2.54356e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 4.856 sec. to 5.864 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00967 ( -0.914927 1.29338 )
Norm@50keV : 5.096095E-03 ( -3.270939E-03 2.623434E-03) )
------------------------------------------------------------
Chi-Squared = 65.45939 using 59 PHA bins.
Reduced chi-squared = 1.148410 for 57 degrees of freedom
Null hypothesis probability = 0.207
Photon flux (15-150 keV) in 1.008 sec: 0.767979 ( -0.33287 0.332761 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.74156e-08 ( -2.40078e-08 2.48397e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.856 sec. to 5.864 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00946 ( -0.919014 1.29872 )
Epeak [keV] : 9997.16 ( 0.00000 2.84082 )
Norm@50keV : 5.098400E-03 ( -3.285705E-03 2.634326E-03) )
------------------------------------------------------------
Chi-Squared = 65.45934 using 59 PHA bins.
Reduced chi-squared = 1.168917 for 56 degrees of freedom
Null hypothesis probability = 0.181
Photon flux (15-150 keV) in 1.008 sec: 0.767630 ( -0.332767 0.33265 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.73764e-08 ( -2.39773e-08 2.48784e-08 ) ergs/cm2
Band function
Time interval is from 4.856 sec. to 5.864 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.52877 ( -8.47123 6.52877 )
beta : -1.98907 ( -8.01093 0.892196 )
Epeak [keV] : 14.0290 ( -13.9290 9985.97 )
Norm@50keV : 1.476337E-02 ( -1.476337E-02 359.074 )
------------------------------------------------------------
Chi-Squared = 65.46107 using 59 PHA bins.
Reduced chi-squared = 1.190201 for 55 degrees of freedom
Null hypothesis probability = 0.158
Photon flux (15-150 keV) in 1.008 sec: 0.767998 ( -0.331995 0.327432 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.77296e-08 ( -2.41457e-08 2.03501e-08 ) ergs/cm2
Plot creation:
Fri Mar 13 14:39:37 EDT 2009