batgrbproduct Analysis for Trigger=374210
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 Oct 29 14:32:16 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger374210/GCN5_download_cron
======================================================================
Trigger: 00374210 Segment: 000
BAT Trigger Time: 278481207.808 [s; MET]
Trigger Stop: 278481208.832 [s; MET]
UTC: 2009-10-29T03:53:22.595560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 60.1834083668177 Dec: -55.9938395285014 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.18
Image Trigger?: NO
Rate S/N Ratio: 17 [ if not an image trigger ]
Image S/N Ratio: 9.18
Flight Position: [ source = BAT ]
RA: 60.1834083668177 Dec: -55.9938395285014 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 60.1663638612223 Dec: -55.9534422114284 [deg; J2000]
{ 04h 00m 39.9s , -55d 57' 12.4" }
+/- 0.625963643129534 [arcmin] (estimated 90% radius based on SNR)
+/- 0.202220209621384 [arcmin] (formal 1-sigma fit error)
SNR: 59.3967263194945
Angular difference between Flight and Ground position is 2.490477 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 39.2039999365807 +/- 4.82961031431318
Measured from: 0.996000111103058
to: 40.2000000476837 [s; relative to TRIGTIME]
T50: 13.4639999270439 +/- 1.07011773132344
Measured from: 14.7480000853539
to: 28.2120000123978 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 19.12399995327
to: 20.12399995327 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.82400000095367
to: 60.1959999799728 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.645528 1.782342 1.014929 0.181404
0.040352 0.042194 0.037253 0.031998 [error]
Peak 0.077527 0.084524 0.048717 0.010334
0.005792 0.006210 0.005378 0.004178 [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 5.02e-07 7.30e-07 7.91e-07 1.60e-06 2.52e-06 3.62e-06 erg/cm2
Error 2.88e-08 2.40e-08 3.82e-08 1.68e-07 8.68e-08 1.96e-07 erg/cm2
Peak flux Power-law 7.09e-01 5.98e-01 3.43e-01 2.93e-01 1.78e+00 1.94e+00 ph/cm2/s
Error 8.57e-02 4.93e-02 4.31e-02 7.02e-02 1.47e-01 1.63e-01 ph/cm2/s
Fluence Cutoff-PL 4.65e-07 7.53e-07 7.96e-07 8.70e-07 2.42e-06 2.89e-06 erg/cm2
Error 3.63e-08 2.82e-08 4.04e-08 3.28e-07 1.07e-07 3.50e-07 erg/cm2
Peak flux Cutoff-PL 6.47e-01 6.62e-01 3.44e-01 1.08e-01 1.77e+00 1.75e+00 ph/cm2/s
Error 9.70e-02 6.64e-02 5.01e-02 8.29e-02 1.51e-01 1.67e-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 1.76e+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 1.884 0.065 - - 4.41e-03 1.52e-04 57.140 57
CPL 1.465 0.275 61.3 17.6 7.20e-03 2.32e-03 49.750 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.801 0.144 - - 1.29e-02 1.24e-03 63.770 57
CPL 0.923 0.652 52.8 17.7 4.06e-02 4.15e-02 57.030 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: 33.600000 sec.
T50 in the 50-300 keV band: 11.712000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 62.020 -1.824 60.196
T90 39.204 0.996 40.200
T50 13.464 14.748 28.212
Peak 1.000 19.124 20.124
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
60.1664 -55.9534 0.0032 17.0 -148.6 3.9073 59.4 TRIG_00374210
------------------------------------------
Foreground time interval of the image:
-1.824 29.593 (delta_t = 31.417 [sec])
Background time interval of the image:
-126.807 -1.824 (delta_t = 124.983 [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 -1.824 sec. to 60.196 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88437 ( -0.0645714 0.0652127 )
Norm@50keV : 4.41416E-03 ( -0.000152888 0.000151961 )
------------------------------------------------------------
# Chi-Squared = 57.14 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.699209e-01
Photon flux (15-150 keV) in 62.02 sec: 0.629314 ( -0.0216796 0.0217611 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.51672e-06 ( -8.66066e-08 8.69489e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.824 sec. to 60.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46518 ( -0.282003 0.267697 )
Epeak [keV] : 61.3389 ( -9.19016 25.9735 )
Norm@50keV : 7.20276E-03 ( -0.00188381 0.00276093 )
------------------------------------------------------------
# Chi-Squared = 49.75 using 59 PHA bins.
# Reduced chi-squared = 0.8885 for 56 degrees of freedom
# Null hypothesis probability = 7.088198e-01
Photon flux (15-150 keV) in 62.02 sec: 0.608450 ( -0.024951 0.025124 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41631e-06 ( -1.06482e-07 1.06594e-07 ) ergs/cm2
Band function
Time interval is from -1.824 sec. to 60.196 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.46347 ( -0.269039 0.416115 )
beta : -2.56940 ( 2.56834 0.592925 )
Epeak [keV] : 61.1287 ( -16.3105 24.3448 )
Norm@50keV : 7.22332E-03 ( -0.00190935 0.0054003 )
------------------------------------------------------------
# Chi-Squared = 49.74 using 59 PHA bins.
# Reduced chi-squared = 0.9044 for 55 degrees of freedom
# Null hypothesis probability = 6.751525e-01
Photon flux (15-150 keV) in 62.02 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 19.124 sec. to 20.124 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80096 ( -0.141746 0.146401 )
Norm@50keV : 1.28976E-02 ( -0.00125165 0.00123475 )
------------------------------------------------------------
# Chi-Squared = 63.77 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 57 degrees of freedom
# Null hypothesis probability = 2.506654e-01
Photon flux (15-150 keV) in 1 sec: 1.77793 ( -0.146702 0.146723 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18733e-07 ( -1.16676e-08 1.18414e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 19.124 sec. to 20.124 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.923484 ( -0.705765 0.598265 )
Epeak [keV] : 52.7839 ( -9.60611 25.7584 )
Norm@50keV : 4.05595E-02 ( -0.021671 0.0613167 )
------------------------------------------------------------
# Chi-Squared = 57.03 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 56 degrees of freedom
# Null hypothesis probability = 4.365113e-01
Photon flux (15-150 keV) in 1 sec: 1.77392 ( -0.1512 0.15127 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12382e-07 ( -1.28608e-08 1.3321e-08 ) ergs/cm2
Band function
Time interval is from 19.124 sec. to 20.124 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.923107 ( -0.514619 0.745747 )
beta : -10.00000 ( 4.45345e+09 4.45345e+09 )
Epeak [keV] : 52.7592 ( -9.59021 25.7678 )
Norm@50keV : 4.05839E-02 ( -0.021704 0.0613377 )
------------------------------------------------------------
# Chi-Squared = 57.03 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 55 degrees of freedom
# Null hypothesis probability = 3.994471e-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 Oct 29 15:06:33 EDT 2009