batgrbproduct Analysis for Trigger=335895
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 Nov 28 22:15:30 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger335895/GCN5_download_cron
======================================================================
Trigger: 00335895 Segment: 000
BAT Trigger Time: 249585528 [s; MET]
Trigger Stop: 249585616 [s; MET]
UTC: 2008-11-28T17:18:44.708060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 20.7981962498564 Dec: 38.1151246414524 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 20.22
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 20.22
Flight Position: [ source = BAT ]
RA: 20.7981962498564 Dec: 38.1151246414524 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 20.8007131444641 Dec: 38.1240060615556 [deg; J2000]
{ 01h 23m 12.2s , +38d 07' 26.4" }
+/- 0.96017626305813 [arcmin] (estimated 90% radius based on SNR)
+/- 0.320255230630215 [arcmin] (formal 1-sigma fit error)
SNR: 32.2352681005274
Angular difference between Flight and Ground position is 0.545968 arcmin
Partial Coding Fraction: 0.7421875 [ including projection effects ]
Duration
T90: 101.752000033855 +/- 10.8145383620074
Measured from: -48.3159999251366
to: 53.4360001087189 [s; relative to TRIGTIME]
T50: 31.8560000061989 +/- 4.96311192854815
Measured from: 4.0840000808239
to: 35.9400000870228 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 17.5959999859333
to: 18.5959999859333 [s; relative to TRIGTIME]
Total Fluence
Measured from: -69.2120000123978
to: 62.6599999964237 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.497667 1.817794 0.916799 0.161912
0.067147 0.068101 0.059765 0.053019 [error]
Peak 0.042001 0.054731 0.042192 0.013086
0.006643 0.006934 0.006039 0.004953 [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 5.35e-07 7.37e-07 7.48e-07 1.38e-06 2.46e-06 3.42e-06 erg/cm2
Error 4.05e-08 3.57e-08 5.78e-08 2.17e-07 1.34e-07 2.74e-07 erg/cm2
Peak flux Power-law 4.34e-01 4.23e-01 2.88e-01 3.08e-01 1.27e+00 1.45e+00 ph/cm2/s
Error 9.59e-02 5.81e-02 4.94e-02 1.08e-01 1.68e-01 1.91e-01 ph/cm2/s
Fluence Cutoff-PL 4.77e-07 8.04e-07 7.35e-07 3.92e-07 2.27e-06 2.40e-06 erg/cm2
Error 4.83e-08 4.76e-08 6.69e-08 2.21e-07 1.55e-07 2.71e-07 erg/cm2
Peak flux Cutoff-PL 4.30e-01 4.25e-01 2.90e-01 2.89e-01 1.27e+00 1.43e+00 ph/cm2/s
Error 1.05e-01 5.90e-02 5.24e-02 1.63e-01 1.66e-01 2.41e-01 ph/cm2/s
Fluence Band 4.68e-07 8.07e-07 7.17e-07 6.88e-07 2.29e-06 2.69e-06 erg/cm2
Error 4.98e-08 5.03e-08 7.26e-08 5.59e-07 1.58e-07 4.71e-07 erg/cm2
Peak flux Band 4.19e-01 4.33e-01 2.90e-01 2.81e-01 1.26e+00 1.43e+00 ph/cm2/s
Error 9.65e-02 7.45e-02 5.17e-02 1.46e-01 1.70e-01 2.39e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.977 0.091 - - 2.03e-03 1.14e-04 49.968 57
CPL 1.080 0.451 45.3 6.1 6.27e-03 3.84e-03 35.802 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.553 0.229 - - 1.00e-02 1.36e-03 53.739 57
CPL 1.483 0.984 314.6 0.0 1.09e-02 1.36e-03 53.769 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: 82.432000 sec.
T50 in the 50-300 keV band: 29.184000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 131.872 -69.212 62.660
T90 101.752 -48.316 53.436
T50 31.856 4.084 35.940
Peak 1.000 17.596 18.596
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
20.8007 +38.1240 0.0060 32.0 -180.0 3.6152 32.2 TRIG_00335895
------------------------------------------
Foreground time interval of the image:
-5.099 62.660 (delta_t = 67.759 [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 -69.212 sec. to 62.660 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97724 ( -9.050441E-02 9.236836E-02) )
Norm@50keV : 2.027769E-03 ( -1.143069E-04 1.133652E-04) )
------------------------------------------------------------
Chi-Squared = 49.96805 using 59 PHA bins.
Reduced chi-squared = 0.8766325 for 57 degrees of freedom
Null hypothesis probability = 0.734
Photon flux (15-150 keV) in 131.9 sec: 0.301025 ( -0.015048 0.015074 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.464e-06 ( -1.33364e-07 1.33971e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -69.212 sec. to 62.660 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08039 ( -0.475225 0.426986 )
Epeak [keV] : 45.3261 ( -5.44823 6.79970 )
Norm@50keV : 6.269987E-03 ( -2.578059E-03 5.097705E-03) )
------------------------------------------------------------
Chi-Squared = 35.80206 using 59 PHA bins.
Reduced chi-squared = 0.6393224 for 56 degrees of freedom
Null hypothesis probability = 0.984
Photon flux (15-150 keV) in 131.9 sec: 0.286612 ( -0.016306 0.01635 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.27104e-06 ( -1.53175e-07 1.57396e-07 ) ergs/cm2
Band function
Time interval is from -69.212 sec. to 62.660 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.05276 ( -0.418097 1.60233 )
beta : -2.76955 ( -7.23045 0.566215 )
Epeak [keV] : 44.4508 ( -11.1457 6.44565 )
Norm@50keV : 6.580143E-03 ( -2.698353E-03 7.393762E-02) )
------------------------------------------------------------
Chi-Squared = 35.29068 using 59 PHA bins.
Reduced chi-squared = 0.6416487 for 55 degrees of freedom
Null hypothesis probability = 0.982
Photon flux (15-150 keV) in 131.9 sec: 0.286395 ( -0.016189 0.016274 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29089e-06 ( -1.60918e-07 1.55167e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 17.596 sec. to 18.596 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55328 ( -0.227559 0.230907 )
Norm@50keV : 1.001347E-02 ( -1.362538E-03 1.348015E-03) )
------------------------------------------------------------
Chi-Squared = 53.73917 using 59 PHA bins.
Reduced chi-squared = 0.9427925 for 57 degrees of freedom
Null hypothesis probability = 0.598
Photon flux (15-150 keV) in 1.000 sec: 1.26885 ( -0.16801 0.16833 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.42122e-08 ( -1.37955e-08 1.39958e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 17.596 sec. to 18.596 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48293 ( -0.952320 1.01545 )
Epeak [keV] : 314.579 ( )
Norm@50keV : 1.088918E-02 ( -1.370923E-03 1.355156E-03) )
------------------------------------------------------------
Chi-Squared = 53.76878 using 59 PHA bins.
Reduced chi-squared = 0.9601569 for 56 degrees of freedom
Null hypothesis probability = 0.560
Photon flux (15-150 keV) in 1.000 sec: 1.26636 ( -0.16609 0.16629 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.42589e-08 ( -1.38233e-08 1.39741e-08 ) ergs/cm2
Band function
Time interval is from 17.596 sec. to 18.596 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.974215 ( -9.02579 4.21277 )
beta : -1.58935 ( -8.41065 0.258590 )
Epeak [keV] : 52.0109 ( -51.9109 585.778 )
Norm@50keV : 2.506279E-02 ( -1.637691E-02 576.724 )
------------------------------------------------------------
Chi-Squared = 53.62059 using 59 PHA bins.
Reduced chi-squared = 0.9749198 for 55 degrees of freedom
Null hypothesis probability = 0.527
Photon flux (15-150 keV) in 1.000 sec: 1.26050 ( -0.17087 0.17006 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.29362e-08 ( -1.24243e-08 1.24598e-08 ) ergs/cm2
Plot creation:
Fri Nov 28 22:38:36 EST 2008