batgrbproduct Analysis for Trigger=345127
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): Thu Mar 5 12:22:05 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger345127/GCN5_download_cron
======================================================================
Trigger: 00345127 Segment: 000
BAT Trigger Time: 257923195.584 [s; MET]
Trigger Stop: 257923195.968 [s; MET]
UTC: 2009-03-05T05:19:51.035240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 241.756459293576 Dec: -31.5669267307704 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.11
Image Trigger?: NO
Rate S/N Ratio: 16.2172747402269 [ if not an image trigger ]
Image S/N Ratio: 9.11
Flight Position: [ source = BAT ]
RA: 241.756459293576 Dec: -31.5669267307704 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 241.765985497611 Dec: -31.5720574273588 [deg; J2000]
{ 16h 07m 03.8s , -31d 34' 19.4" }
+/- 2.2747307782365 [arcmin] (estimated 90% radius based on SNR)
+/- 1.46115785696031 [arcmin] (formal 1-sigma fit error)
SNR: 9.40195946466725
Angular difference between Flight and Ground position is 0.576124 arcmin
Partial Coding Fraction: 0.5 [ including projection effects ]
Duration
T90: 0.356000006198883 +/- 0.0512250139317464
Measured from: 0.0280000865459442
to: 0.384000092744827 [s; relative to TRIGTIME]
T50: 0.236000031232834 +/- 0.0656048918007958
Measured from: 0.08800008893013
to: 0.324000120162964 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.287999987602234
to: 0.712000012397766 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.00800001621246338
to: 0.412000000476837 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.015356 0.023898 0.038127 0.025433
0.005868 0.005538 0.005787 0.004814 [error]
Peak 0.014892 0.024018 0.038807 0.025015
0.005898 0.005553 0.005811 0.004825 [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 4.54e-09 1.25e-08 2.77e-08 1.63e-07 7.48e-08 1.76e-07 erg/cm2
Error 1.94e-09 3.19e-09 4.95e-09 7.08e-08 1.34e-08 0.00e+00 erg/cm2
Peak flux Power-law 3.55e-01 5.29e-01 5.88e-01 1.23e+00 1.85e+00 2.71e+00 ph/cm2/s
Error 1.53e-01 1.40e-01 1.03e-01 4.86e-01 3.56e-01 5.12e-01 ph/cm2/s
Fluence Cutoff-PL 4.32e-09 1.26e-08 2.83e-08 1.41e-07 7.47e-08 1.46e-07 erg/cm2
Error 3.34e-09 3.28e-09 6.15e-09 1.21e-07 1.35e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 3.55e-01 5.29e-01 5.89e-01 1.23e+00 1.85e+00 2.70e+00 ph/cm2/s
Error 1.53e-01 1.40e-01 1.03e-01 4.83e-01 3.56e-01 5.10e-01 ph/cm2/s
Fluence Band 4.35e-09 1.25e-08 2.81e-08 1.45e-07 7.47e-08 1.19e-07 erg/cm2
Error 2.32e-09 3.23e-09 6.13e-09 1.21e-07 1.01e-08 0.00e+00 erg/cm2
Peak flux Band 3.39e-01 5.28e-01 5.99e-01 1.10e+00 1.84e+00 2.57e+00 ph/cm2/s
Error 1.87e-01 1.43e-01 1.29e-01 8.85e-01 3.67e-01 7.48e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.852 0.332 - - 1.62e-02 3.17e-03 39.375 57
CPL 0.685 1.012 514.2 5000.0 1.88e-02 2.43e-02 39.368 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.847 0.331 - - 1.61e-02 3.15e-03 38.786 57
CPL 0.705 1.040 595.2 5000.0 1.83e-02 2.78e-02 38.755 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: 0.448000 sec.
T50 in the 50-300 keV band: 0.256000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.404 0.008 0.412
T90 0.356 0.028 0.384
T50 0.236 0.088 0.324
Peak 1.000 -0.288 0.712
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
241.7660 -31.5721 0.0205 42.9 -13.8 0.1043 9.4 TRIG_00345127
------------------------------------------
Foreground time interval of the image:
0.008 0.412 (delta_t = 0.404 [sec])
Background time interval of the image:
-239.584 0.008 (delta_t = 239.592 [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 0.008 sec. to 0.412 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.852149 ( -0.344964 0.319111 )
Norm@50keV : 1.619440E-02 ( -3.225709E-03 3.112517E-03) )
------------------------------------------------------------
Chi-Squared = 39.37483 using 59 PHA bins.
Reduced chi-squared = 0.6907865 for 57 degrees of freedom
Null hypothesis probability = 0.964
Photon flux (15-150 keV) in 0.4040 sec: 1.85894 ( -0.35632 0.36091 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.48337e-08 ( -1.3391e-08 1.34322e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.008 sec. to 0.412 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.685028 ( -1.54351 0.480819 )
Epeak [keV] : 514.243 ( -514.233 9485.76 )
Norm@50keV : 1.879478E-02 ( -5.725952E-03 4.291245E-02) )
------------------------------------------------------------
Chi-Squared = 39.36784 using 59 PHA bins.
but latest trial 6.170723E-02 gives Chi-Squared = 89.4908
Reduced chi-squared = 0.7029971 for 56 degrees of freedom
Null hypothesis probability = 0.955
Photon flux (15-150 keV) in 0.4040 sec: 1.85831 ( -0.35614 0.36078 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.47327e-08 ( -1.34936e-08 1.35372e-08 ) ergs/cm2
Band function
Time interval is from 0.008 sec. to 0.412 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.796631 ( -4.320145E-04 14.9996 )
beta : -0.873602 ( -0.319108 0.344934 )
Epeak [keV] : 15.6339 ( -15.5339 9984.37 )
Norm@50keV : 2.386906E-02 ( -0.438902 0.422497 )
------------------------------------------------------------
Chi-Squared = 39.38822 using 59 PHA bins.
Reduced chi-squared = 0.7161494 for 55 degrees of freedom
Null hypothesis probability = 0.944
Photon flux (15-150 keV) in 0.4040 sec: 1.84862 ( -0.34668 0.35908 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.47214e-08 ( -1.35279e-08 6.7573e-09 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 27.3924 -5.8606 9.1366
R^2/D10^2 : 3.563648E-02 -0.0203909 0.0393503
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 43.45652 using 59 PHA bins.
Reduced chi-squared = 0.7623951 for 57 degrees of freedom
Null hypothesis probability = 0.907
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.784e-09 6.720e-10
25- 50 1.058e-08 3.240e-09
50-150 5.777e-08 2.007e-08
15-150 7.014e-08 2.155e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363
Norm : 7.91514 -7.91514 1e+24
------------------------------------------------------------
Chi-Squared = 53.16961 using 59 PHA bins.
Reduced chi-squared = 0.9328002 for 57 degrees of freedom
Null hypothesis probability = 0.620
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.960e-09 3.585e-09
25- 50 1.532e-08 8.347e-09
50-150 3.363e-08 1.774e-08
15-150 5.691e-08 2.958e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.34246 -4.21829 18.5768
R1^2/D10^2 : 1.60288 -1.56676 10.4184
kT2 [keV] : 34.4298 -10.188 165.57
R2^2/D10^2 : 1.677983E-02 -0.0166198 1e+24
------------------------------------------------------------
Chi-Squared = 39.64997 using 59 PHA bins.
but latest trial 24.9212 gives Chi-Squared = 2.84039
but latest trial 1.151543E-04 gives Chi-Squared = 2.92025
Reduced chi-squared = 0.7209086 for 55 degrees of freedom
Null hypothesis probability = 0.941
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.884e-09 2.838e-09
25- 50 1.167e-08 4.563e-09
50-150 5.907e-08 2.751e-08
15-150 7.563e-08 3.185e-08
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.008 sec. to 0.416 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.847111 ( -0.344091 0.318432 )
Norm@50keV : 1.608653E-02 ( -3.207779E-03 3.094850E-03) )
------------------------------------------------------------
Chi-Squared = 38.78622 using 59 PHA bins.
Reduced chi-squared = 0.6804599 for 57 degrees of freedom
Null hypothesis probability = 0.969
Photon flux (15-150 keV) in 0.4080 sec: 1.84669 ( -0.35371 0.35834 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.5225e-08 ( -1.34269e-08 1.34701e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.008 sec. to 0.416 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.704581 ( -1.62498 0.454159 )
Epeak [keV] : 595.171 ( -595.161 9404.83 )
Norm@50keV : 1.825181E-02 ( -5.258506E-03 5.027295E-02) )
------------------------------------------------------------
Chi-Squared = 38.75520 using 59 PHA bins.
Reduced chi-squared = 0.6920571 for 56 degrees of freedom
Null hypothesis probability = 0.962
Photon flux (15-150 keV) in 0.4080 sec: 1.84605 ( -0.35352 0.35824 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.52201e-08 ( -1.35407e-08 1.33771e-08 ) ergs/cm2
Band function
Time interval is from 0.008 sec. to 0.416 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.792033 ( -9.20797 5.79203 )
beta : -0.847117 ( -0.318419 0.344100 )
Epeak [keV] : 14.7202 ( -14.6202 9985.28 )
Norm@50keV : 2.405822E-02 ( -1.103731E-02 461617. )
------------------------------------------------------------
Chi-Squared = 38.78625 using 59 PHA bins.
Reduced chi-squared = 0.7052045 for 55 degrees of freedom
Null hypothesis probability = 0.952
Photon flux (15-150 keV) in 0.4080 sec: 1.83531 ( -0.36711 0.36708 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.51022e-08 ( -1.35966e-08 1.34958e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 27.6034 -5.8616 9.0953
R^2/D10^2 : 3.471189E-02 -0.0197114 0.037781
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 42.61939 using 59 PHA bins.
Reduced chi-squared = 0.7477086 for 57 degrees of freedom
Null hypothesis probability = 0.922
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.774e-09 6.984e-10
25- 50 1.056e-08 3.487e-09
50-150 5.843e-08 1.815e-08
15-150 7.076e-08 2.243e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363
Norm : 7.86573 -7.86573 1e+24
------------------------------------------------------------
Chi-Squared = 52.82393 using 59 PHA bins.
Reduced chi-squared = 0.9267355 for 57 degrees of freedom
Null hypothesis probability = 0.632
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.988e-09 3.505e-09
25- 50 1.537e-08 8.581e-09
50-150 3.375e-08 1.764e-08
15-150 5.711e-08 2.992e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.09091 -3.97427 9.52359
R1^2/D10^2 : 1.84068 -1.80458 137.822
kT2 [keV] : 34.0467 -9.6518 165.953
R2^2/D10^2 : 1.737515E-02 -0.0172318 1e+24
------------------------------------------------------------
Chi-Squared = 38.84460 using 59 PHA bins.
but latest trial 24.7708 gives Chi-Squared = 2.81882
but latest trial 1.445226E-04 gives Chi-Squared = 2.26307
Reduced chi-squared = 0.7062654 for 55 degrees of freedom
Null hypothesis probability = 0.951
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.967e-09 2.654e-09
25- 50 1.157e-08 4.031e-09
50-150 5.955e-08 2.685e-08
15-150 7.609e-08 3.038e-08
Plot creation:
Thu Mar 5 13:00:18 EST 2009