batgrbproduct Analysis for Trigger=332399
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 v2.41
Process Start Time (local time): Wed Oct 22 16:54:36 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger332399/GCN5_download_cron
======================================================================
Trigger: 00332399 Segment: 000
BAT Trigger Time: 246378232 [s; MET]
Trigger Stop: 246378296 [s; MET]
UTC: 2008-10-22T14:23:48.804900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 226.618689631337 Dec: 12.4160839741371 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.84
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 14.84
Flight Position: [ source = BAT ]
RA: 226.618689631337 Dec: 12.4160839741371 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 226.583937101156 Dec: 12.4090762950168 [deg; J2000]
{ 15h 06m 20.1s , +12d 24' 32.7" }
+/- 1.42416631315586 [arcmin] (estimated 90% radius based on SNR)
+/- 0.577798471057715 [arcmin] (formal 1-sigma fit error)
SNR: 18.3546428689604
Angular difference between Flight and Ground position is 2.079365 arcmin
Partial Coding Fraction: 0.6484375 [ including projection effects ]
Duration
T90: 158.916000008583 +/- 39.8044373968142
Measured from: 9.42400008440018
to: 168.340000092983 [s; relative to TRIGTIME]
T50: 59.4600000083447 +/- 8.09555928315862
Measured from: 38.5880000889301
to: 98.0480000972748 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 57.1759999990463
to: 58.1759999990463 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.28000000119209
to: 207.307999998331 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.336091 1.610807 1.086038 0.323129
0.086070 0.085307 0.075883 0.066639 [error]
Peak 0.025383 0.026778 0.018455 0.006227
0.006003 0.006293 0.005451 0.004699 [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 4.09e-07 6.76e-07 8.46e-07 2.11e-06 2.52e-06 4.06e-06 erg/cm2
Error 4.18e-08 4.19e-08 7.50e-08 3.97e-07 1.75e-07 4.59e-07 erg/cm2
Peak flux Power-law 2.43e-01 2.09e-01 1.23e-01 1.08e-01 6.21e-01 6.82e-01 ph/cm2/s
Error 8.87e-02 4.91e-02 4.71e-02 8.38e-02 1.46e-01 1.66e-01 ph/cm2/s
Fluence Cutoff-PL 3.92e-07 6.97e-07 8.54e-07 1.29e-06 2.45e-06 3.27e-06 erg/cm2
Error 4.99e-08 5.24e-08 5.92e-08 8.71e-07 1.55e-07 9.06e-07 erg/cm2
Peak flux Cutoff-PL 2.43e-01 2.09e-01 1.23e-01 1.07e-01 6.21e-01 6.81e-01 ph/cm2/s
Error 8.87e-02 4.91e-02 4.71e-02 8.32e-02 1.46e-01 1.66e-01 ph/cm2/s
Fluence Band 4.03e-07 6.94e-07 8.52e-07 1.29e-06 2.45e-06 3.95e-06 erg/cm2
Error 5.28e-08 7.87e-08 8.71e-07 2.06e-07 6.59e-07 0.00e+00 erg/cm2
Peak flux Band 2.43e-01 2.09e-01 1.23e-01 1.07e-01 6.21e-01 6.82e-01 ph/cm2/s
Error 8.87e-02 4.93e-02 4.71e-02 8.32e-02 1.46e-01 1.66e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.675 0.113 - - 1.25e-03 8.18e-05 58.582 57
CPL 1.279 0.454 86.5 4968.6 2.01e-03 1.07e-03 57.434 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.767 0.478 - - 4.56e-03 1.32e-03 48.508 57
CPL 1.767 0.480 9993.4 5000.0 4.57e-03 1.33e-03 48.510 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: 101.824000 sec.
T50 in the 50-300 keV band: 43.712000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 216.588 -9.280 207.308
T90 158.916 9.424 168.340
T50 59.460 38.588 98.048
Peak 1.000 57.176 58.176
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
226.5839 +12.4091 0.0105 23.1 -85.9 3.9636 18.4 TRIG_00332399
------------------------------------------
Foreground time interval of the image:
-9.280 207.308 (delta_t = 216.588 [sec])
Background time interval of the image:
-239.000 -9.280 (delta_t = 229.720 [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 -9.280 sec. to 207.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67492 ( -0.112405 0.114025 )
Norm@50keV : 1.254990E-03 ( -8.212205E-05 8.151459E-05) )
------------------------------------------------------------
Chi-Squared = 58.58196 using 59 PHA bins.
Reduced chi-squared = 1.027754 for 57 degrees of freedom
Null hypothesis probability = 0.417
Photon flux (15-150 keV) in 216.6 sec: 0.165242 ( -0.010271 0.010286 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.52198e-06 ( -1.74471e-07 1.76334e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.280 sec. to 207.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27899 ( -0.427604 0.481361 )
Epeak [keV] : 86.5236 ( -23.7051 9913.48 )
Norm@50keV : 2.010923E-03 ( -8.163929E-04 1.331121E-03) )
------------------------------------------------------------
Chi-Squared = 57.43391 using 59 PHA bins.
Reduced chi-squared = 1.025606 for 56 degrees of freedom
Null hypothesis probability = 0.422
Photon flux (15-150 keV) in 216.6 sec: 0.162463 ( -0.011106 0.010949 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.45128e-06 ( -2.0629e-07 1.03167e-07 ) ergs/cm2
Band function
Time interval is from -9.280 sec. to 207.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.09173 ( -8.90827 2.91817 )
beta : -1.94031 ( -8.05969 0.327816 )
Epeak [keV] : 67.9546 ( -67.8546 9932.04 )
Norm@50keV : 2.614527E-03 ( -2.614527E-03 46.6896 )
------------------------------------------------------------
Chi-Squared = 56.71776 using 59 PHA bins.
Reduced chi-squared = 1.031232 for 55 degrees of freedom
Null hypothesis probability = 0.411
Photon flux (15-150 keV) in 216.6 sec: 0.161735 ( -0.010958 0.011115 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.44855e-06 ( -2.0577e-07 2.0551e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 57.176 sec. to 58.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76731 ( -0.450223 0.505614 )
Norm@50keV : 4.564557E-03 ( -1.372171E-03 1.262818E-03) )
------------------------------------------------------------
Chi-Squared = 48.50817 using 59 PHA bins.
Reduced chi-squared = 0.8510206 for 57 degrees of freedom
Null hypothesis probability = 0.781
Photon flux (15-150 keV) in 1.000 sec: 0.621199 ( -0.146062 0.146067 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.20948e-08 ( -1.23145e-08 1.27291e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 57.176 sec. to 58.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76670 ( -0.452767 0.507709 )
Epeak [keV] : 9993.37 ( -9993.36 6.63086 )
Norm@50keV : 4.570384E-03 ( -1.381316E-03 1.271049E-03) )
------------------------------------------------------------
Chi-Squared = 48.51029 using 59 PHA bins.
Reduced chi-squared = 0.8662552 for 56 degrees of freedom
Null hypothesis probability = 0.751
Photon flux (15-150 keV) in 1.000 sec: 0.620968 ( -0.14602 0.146026 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.20948e-08 ( -1.23368e-08 1.2729e-08 ) ergs/cm2
Band function
Time interval is from 57.176 sec. to 58.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.99921 ( -7.99511 0.690775 )
beta : -7.31576 ( -0.505441 0.450300 )
Epeak [keV] : 9999.31 ( -9999.21 0.692383 )
Norm@50keV : 4.110325E-03 ( -0.150628 0.145813 )
------------------------------------------------------------
Chi-Squared = 49.14801 using 59 PHA bins.
Reduced chi-squared = 0.8936001 for 55 degrees of freedom
Null hypothesis probability = 0.697
Photon flux (15-150 keV) in 1.000 sec: 0.620967 ( -0.146019 0.146027 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.20567e-08 ( -9.8776e-09 1.0707e-08 ) ergs/cm2
Plot creation:
Wed Oct 22 17:10:12 EDT 2008