batgrbproduct Analysis for Trigger=230711
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 Jan 2 06:10:40 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger230711/SDC
======================================================================
Trigger: 00230711 Segment: 000
BAT Trigger Time: 180711184 [s; MET]
Trigger Stop: 180711272 [s; MET]
UTC: 2006-09-23T13:33:02.537640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 346.126952999923 Dec: 3.94232297853285 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.45
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11.45
Flight Position: [ source = BAT ]
RA: 346.126952999923 Dec: 3.94232297853285 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 346.118396693203 Dec: 3.93833634232154 [deg; J2000]
{ 23h 04m 28.4s , +03d 56' 18.0" }
+/- 2.1035761979022 [arcmin] (estimated 90% radius based on SNR)
+/- 0.792492137243789 [arcmin] (formal 1-sigma fit error)
SNR: 10.5135516868916
RA = 23h 4m 28.4s (346.118397 deg.)
Dec = 3d 56' 18" (3.938336 deg.)
Angular difference between Flight and Ground position is 0.565269 arcmin
Partial Coding Fraction: 0.1738281 [ including projection effects ]
Duration
T90: 68.431999951601 +/- 11.1502351458394
Measured from: 8.87200000882149
to: 77.3039999604225 [s; relative to TRIGTIME]
T50: 44.5759999752045 +/- 13.6395495553916
Measured from: 27.0320000052452
to: 71.6079999804497 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.97200000286102
to: 7.97200000286102 [s; relative to TRIGTIME]
Total Fluence
Measured from: 6.82400000095367
to: 90.7120000123978 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.139822 1.261300 0.398241 0.134930
0.114585 0.117956 0.105504 0.099824 [error]
Peak 0.021238 0.048465 0.010368 0.022408
0.012710 0.013438 0.012189 0.011057 [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 4.42e-07 5.10e-07 4.23e-07 5.89e-07 1.59e-06 1.97e-06 erg/cm2
Error 6.86e-08 6.18e-08 9.85e-08 2.65e-07 2.24e-07 3.88e-07 erg/cm2
Peak flux Power-law 3.33e-01 2.62e-01 1.39e-01 1.07e-01 7.82e-01 8.41e-01 ph/cm2/s
Error 1.79e-01 1.11e-01 8.47e-02 1.35e-01 3.30e-01 3.60e-01 ph/cm2/s
Fluence Cutoff-PL 4.27e-07 5.49e-07 3.87e-07 1.74e-07 1.48e-06 1.55e-06 erg/cm2
Error 7.49e-08 8.93e-08 1.33e-07 4.06e-07 2.73e-07 5.28e-07 erg/cm2
Peak flux Cutoff-PL 2.55e-01 4.13e-01 1.02e-01 1.37e-03 7.72e-01 7.74e-01 ph/cm2/s
Error 1.65e-01 1.60e-01 1.00e-01 2.62e-02 3.01e-01 3.02e-01 ph/cm2/s
Fluence Band 4.20e-07 5.53e-07 3.74e-07 3.44e-07 1.50e-06 1.68e-06 erg/cm2
Error 7.61e-08 8.83e-08 5.97e-08 3.72e-07 2.46e-07 3.85e-07 erg/cm2
Peak flux Band 2.77e-01 3.70e-01 1.32e-01 8.28e-03 8.05e-01 8.15e-01 ph/cm2/s
Error 1.71e-01 1.39e-01 6.87e-02 6.57e-02 3.03e-01 3.48e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.271 0.241 - - 1.99e-03 3.36e-04 53.820 57
CPL 1.606 0.943 22.3 18.4 5.11e-03 2.24e-02 52.744 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.912 0.676 - - 5.43e-03 2.69e-03 66.394 57
CPL -1.206 0.000 39.9 11.9 3.95e-01 8.24e+00 62.415 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 83.888 6.824 90.712
T90 68.432 8.872 77.304
T50 44.576 27.032 71.608
Peak 1.000 6.972 7.972
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
346.1184 +3.9383 0.0184 36.9 65.5 2.7441 10.5 TRIG_00230711
------------------------------------------
Foreground time interval of the image:
6.824 90.712 (delta_t = 83.888 [sec])
Background time interval of the image:
-239.000 6.824 (delta_t = 245.824 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 6.824 sec. to 90.712 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.27147 ( -0.231357 0.250258 )
Norm@50keV : 1.991641E-03 ( -3.396114E-04 3.319134E-04) )
------------------------------------------------------------
Chi-Squared = 53.82010 using 59 PHA bins.
Reduced chi-squared = 0.9442123 for 57 degrees of freedom
Null hypothesis probability = 0.595
Photon flux (15-150 keV) in 83.89 sec: 0.342619 ( -0.039359 0.039365 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.58857e-06 ( -2.20899e-07 2.27669e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.824 sec. to 90.712 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.60569 ( -1.48863 0.396418 )
Epeak [keV] : 22.3037 ( -21.7352 15.1346 )
Norm@50keV : 5.109531E-03 ( -5.109531E-03 3.966213E-02) )
------------------------------------------------------------
Chi-Squared = 52.74368 using 59 PHA bins.
but latest trial 2.00449 gives Chi-Squared = 4.71007
but latest trial 0.181414 gives Chi-Squared = 2.75378
Reduced chi-squared = 0.9418514 for 56 degrees of freedom
Null hypothesis probability = 0.599
Photon flux (15-150 keV) in 83.89 sec: 0.334621 ( -0.041526 0.041345 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47833e-06 ( -2.60311e-07 2.86065e-07 ) ergs/cm2
Band function
Time interval is from 6.824 sec. to 90.712 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.45243 ( -8.54757 5.46664 )
beta : -2.72237 ( -7.27763 0.605082 )
Epeak [keV] : 23.7636 ( -23.6636 12.5569 )
Norm@50keV : 6.557239E-03 ( -6.557239E-03 200.009 )
------------------------------------------------------------
Chi-Squared = 52.33659 using 59 PHA bins.
Reduced chi-squared = 0.9515744 for 55 degrees of freedom
Null hypothesis probability = 0.577
Photon flux (15-150 keV) in 83.89 sec: 0.334689 ( -0.040862 0.041085 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.49842e-06 ( -2.60395e-07 2.30723e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 6.968 sec. to 7.976 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91241 ( -0.620560 0.730649 )
Norm@50keV : 5.432130E-03 ( -2.722725E-03 2.650518E-03) )
------------------------------------------------------------
Chi-Squared = 66.39430 using 59 PHA bins.
Reduced chi-squared = 1.164812 for 57 degrees of freedom
Null hypothesis probability = 0.185
Photon flux (15-150 keV) in 1.008 sec: 0.782424 ( -0.329518 0.329556 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.02219e-08 ( -2.21462e-08 2.54475e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.968 sec. to 7.976 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.20618 ( )
Epeak [keV] : 39.8541 ( -10.1096 13.7141 )
Norm@50keV : 0.394974 ( -3.36769 13.1080 )
------------------------------------------------------------
Chi-Squared = 62.41499 using 59 PHA bins.
Reduced chi-squared = 1.114553 for 56 degrees of freedom
Null hypothesis probability = 0.259
Photon flux (15-150 keV) in 1.008 sec: 0.771581 ( -0.288777 0.313259 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.20364e-08 ( -1.63902e-08 2.10398e-08 ) ergs/cm2
Band function
Time interval is from 6.968 sec. to 7.976 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.10334 ( -2.50634 3.89666 )
beta : -9.36599 ( -5.912781E-05 0.634062 )
Epeak [keV] : 41.5318 ( -9.58309 21.2056 )
Norm@50keV : 0.341303 ( -2.78818 44.7809 )
------------------------------------------------------------
Chi-Squared = 62.36638 using 59 PHA bins.
Reduced chi-squared = 1.133934 for 55 degrees of freedom
Null hypothesis probability = 0.231
Photon flux (15-150 keV) in 1.008 sec: 0.805070 ( -0.303922 0.303 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.66021e-08 ( -1.86471e-08 2.0918e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 06:26:57 EST 2008