batgrbproduct Analysis for Trigger=305011
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): Fri Mar 7 17:10:02 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger305011/GCN5_download_cron
======================================================================
Trigger: 00305011 Segment: 000
BAT Trigger Time: 226581813.44 [s; MET]
Trigger Stop: 226581821.632 [s; MET]
UTC: 2008-03-07T11:23:30.814100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 136.632785318983 Dec: 35.1682786660791 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.15
Image Trigger?: NO
Rate S/N Ratio: 9 [ if not an image trigger ]
Image S/N Ratio: 7.15
Flight Position: [ source = BAT ]
RA: 136.632785318983 Dec: 35.1682786660791 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 136.628982318693 Dec: 35.1513794986496 [deg; J2000]
{ 09h 06m 31.0s , +35d 09' 05.0" }
+/- 1.56546563959789 [arcmin] (estimated 90% radius based on SNR)
+/- 0.946973935278912 [arcmin] (formal 1-sigma fit error)
SNR: 16.0345280007577
RA = 9h 6m 31.0s (136.628982 deg.)
Dec = 35d 9' 5" (35.151379 deg.)
Angular difference between Flight and Ground position is 1.030968 arcmin
Partial Coding Fraction: 0.8125 [ including projection effects ]
Duration
T90: 101.423999994993 +/- 24.6783280638892
Measured from: 3.64800000190735
to: 105.071999996901 [s; relative to TRIGTIME]
T50: 49.7480000257492 +/- 29.2304041631796
Measured from: 14.4679999947548
to: 64.216000020504 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.89599999785423
to: 2.89599999785423 [s; relative to TRIGTIME]
Total Fluence
Measured from: 1.69200000166893
to: 146.127999991179 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.607888 0.564232 0.330060 0.125570
0.058905 0.059026 0.051701 0.043741 [error]
Peak 0.014215 0.010550 0.017495 0.012843
0.005328 0.005387 0.004880 0.004059 [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 1.56e-07 2.42e-07 2.83e-07 6.39e-07 8.68e-07 1.32e-06 erg/cm2
Error 2.70e-08 2.70e-08 5.12e-08 2.39e-07 1.18e-07 2.87e-07 erg/cm2
Peak flux Power-law 5.32e-02 9.26e-02 1.23e-01 3.35e-01 3.59e-01 6.04e-01 ph/cm2/s
Error 5.12e-02 7.24e-02 3.66e-02 2.87e-01 1.23e-01 2.53e-01 ph/cm2/s
Fluence Cutoff-PL 1.56e-07 2.42e-07 2.83e-07 6.34e-07 8.68e-07 1.31e-06 erg/cm2
Error 2.70e-08 2.70e-08 5.12e-08 2.37e-07 1.18e-07 2.85e-07 erg/cm2
Peak flux Cutoff-PL 5.30e-02 9.25e-02 1.23e-01 3.33e-01 3.59e-01 6.02e-01 ph/cm2/s
Error 5.12e-02 7.24e-02 3.67e-02 2.86e-01 1.24e-01 2.52e-01 ph/cm2/s
Fluence Band 1.54e-07 2.46e-07 2.76e-07 5.90e-07 8.59e-07 1.28e-06 erg/cm2
Error 2.26e-08 2.28e-08 3.82e-08 1.87e-07 1.16e-07 2.23e-07 erg/cm2
Peak flux Band 5.31e-02 9.26e-02 1.23e-01 3.33e-01 3.59e-01 5.54e-01 ph/cm2/s
Error 5.30e-02 7.24e-02 3.67e-02 2.87e-01 1.24e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.773 0.214 - - 6.52e-04 8.50e-05 54.614 57
CPL 1.624 0.000 112.4 5000.0 7.89e-04 8.57e-05 55.006 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.589 0.768 - - 3.07e-03 1.26e-03 66.184 57
CPL 2.140 4.974 47.4 5000.0 3.76e-04 7.09e-04 65.985 0
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: 35.072000 sec.
T50 in the 50-300 keV band: 16.896000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 144.436 1.692 146.128
T90 101.424 3.648 105.072
T50 49.748 14.468 64.216
Peak 1.000 1.896 2.896
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
136.6290 +35.1514 0.0121 14.6 99.3 1.0916 16.0 TRIG_00305011
------------------------------------------
Foreground time interval of the image:
1.692 48.561 (delta_t = 46.869 [sec])
Background time interval of the image:
-239.440 1.692 (delta_t = 241.132 [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 1.692 sec. to 146.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77335 ( -0.210335 0.217224 )
Norm@50keV : 6.520966E-04 ( -8.608343E-05 8.390361E-05) )
------------------------------------------------------------
Chi-Squared = 54.61395 using 59 PHA bins.
Reduced chi-squared = 0.9581395 for 57 degrees of freedom
Null hypothesis probability = 0.565
Photon flux (15-150 keV) in 144.4 sec: 8.894592E-02 ( -0.00997596 0.00998094 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.67765e-07 ( -1.16336e-07 1.18789e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.692 sec. to 146.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62405 ( )
Epeak [keV] : 112.379 ( -9998.86 1.12793 )
Norm@50keV : 7.890713E-04 ( -8.406973E-05 8.728949E-05) )
------------------------------------------------------------
Chi-Squared = 55.00592 using 59 PHA bins.
Reduced chi-squared = 0.9822485 for 56 degrees of freedom
Null hypothesis probability = 0.513
Photon flux (15-150 keV) in 144.4 sec: 8.891646E-02 ( -0.0099727 0.00997785 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.67776e-07 ( -1.16422e-07 1.18744e-07 ) ergs/cm2
Band function
Time interval is from 1.692 sec. to 146.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.24788 ( -10.4281 2.86559 )
beta : -1.80309 ( -0.310738 0.273447 )
Epeak [keV] : 37.7557 ( -28.3842 9971.52 )
Norm@50keV : 1.578768E-03 ( -0.317603 126.745 )
------------------------------------------------------------
Chi-Squared = 54.33550 using 59 PHA bins.
Reduced chi-squared = 0.9879183 for 55 degrees of freedom
Null hypothesis probability = 0.500
Photon flux (15-150 keV) in 144.4 sec: 8.891660E-02 ( -0.010138 0.0099075 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.58543e-07 ( -1.24551e-07 1.06979e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.896 sec. to 2.896 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.588583 ( -0.863642 0.672714 )
Norm@50keV : 3.072015E-03 ( -1.376344E-03 1.146896E-03) )
------------------------------------------------------------
Chi-Squared = 66.18379 using 59 PHA bins.
Reduced chi-squared = 1.161119 for 57 degrees of freedom
Null hypothesis probability = 0.190
Photon flux (15-150 keV) in 1.000 sec: 0.359191 ( -0.12016 0.12504 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.94837e-08 ( -1.21404e-08 1.21275e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.896 sec. to 2.896 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14048 ( -4.15619 5.79272 )
Epeak [keV] : 47.4370 ( -47.4267 9952.56 )
Norm@50keV : 3.763819E-04 ( -3.763819E-04 1.041381E-03) )
------------------------------------------------------------
Chi-Squared = 65.98454 using 59 PHA bins.
but latest trial 1.417949E-03 gives Chi-Squared = 2.33328
Reduced chi-squared = 1.178295 for 56 degrees of freedom
Null hypothesis probability = 0.170
Photon flux (15-150 keV) in 1.000 sec: 0.358982 ( -0.122576 0.124997 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.95283e-08 ( -1.21877e-08 1.21264e-08 ) ergs/cm2
Band function
Time interval is from 1.896 sec. to 2.896 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.874936 ( -9.12506 5.87494 )
beta : -0.589901 ( -0.671401 0.864963 )
Epeak [keV] : 16.4668 ( -16.3668 9983.53 )
Norm@50keV : 4.295942E-03 ( -4.295942E-03 43047.4 )
------------------------------------------------------------
Chi-Squared = 66.18382 using 59 PHA bins.
Reduced chi-squared = 1.203342 for 55 degrees of freedom
Null hypothesis probability = 0.144
Photon flux (15-150 keV) in 1.000 sec: 0.358983 ( -0.122577 0.124996 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.95026e-08 ( -1.2181e-08 1.21014e-08 ) ergs/cm2
Plot creation:
Fri Mar 7 17:37:11 EST 2008