batgrbproduct Analysis for Trigger=324895
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): Tue Sep 16 17:38:36 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger324895/GCN5_download_cron
======================================================================
Trigger: 00324895 Segment: 000
BAT Trigger Time: 243251123.712 [s; MET]
Trigger Stop: 243251124.736 [s; MET]
UTC: 2008-09-16T09:45:20.610200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 336.30162356459 Dec: -57.0218867906394 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 20.32
Image Trigger?: NO
Rate S/N Ratio: 59.9249530663145 [ if not an image trigger ]
Image S/N Ratio: 20.32
Flight Position: [ source = BAT ]
RA: 336.30162356459 Dec: -57.0218867906394 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 336.288496834868 Dec: -57.0260707726282 [deg; J2000]
{ 22h 25m 09.2s , -57d 01' 33.9" }
+/- 0.633030615891159 [arcmin] (estimated 90% radius based on SNR)
+/- 0.231555480282118 [arcmin] (formal 1-sigma fit error)
SNR: 58.4517285724283
Angular difference between Flight and Ground position is 0.496780 arcmin
Partial Coding Fraction: 0.828125 [ including projection effects ]
Duration
T90: 60.3519999980927 +/- 6.3258975691903
Measured from: -0.595999926328659
to: 59.756000071764 [s; relative to TRIGTIME]
T50: 23.1439999938011 +/- 0.998599005303173
Measured from: 3.82400009036064
to: 26.9680000841618 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.25199997425079
to: 2.25199997425079 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.40000000596046
to: 88.6399999856949 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.972324 2.725954 1.873410 0.325882
0.049116 0.049498 0.043007 0.034753 [error]
Peak 0.053113 0.132913 0.125535 0.034538
0.006179 0.006975 0.006655 0.004726 [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 6.49e-07 1.10e-06 1.42e-06 3.70e-06 4.19e-06 6.88e-06 erg/cm2
Error 3.13e-08 3.06e-08 4.53e-08 2.67e-07 1.09e-07 2.93e-07 erg/cm2
Peak flux Power-law 6.15e-01 8.14e-01 7.92e-01 1.38e+00 2.67e+00 3.60e+00 ph/cm2/s
Error 7.00e-02 5.78e-02 5.15e-02 1.86e-01 1.61e-01 1.75e-01 ph/cm2/s
Fluence Cutoff-PL 5.84e-07 1.13e-06 1.46e-06 2.03e-06 4.04e-06 5.22e-06 erg/cm2
Error 4.02e-08 3.42e-08 5.01e-08 4.93e-07 1.26e-07 5.07e-07 erg/cm2
Peak flux Cutoff-PL 4.81e-01 8.67e-01 8.84e-01 5.80e-01 2.58e+00 2.81e+00 ph/cm2/s
Error 8.53e-02 6.74e-02 6.59e-02 2.02e-01 1.66e-01 2.56e-01 ph/cm2/s
Fluence Band 5.77e-07 1.13e-06 1.46e-06 2.54e-06 4.03e-06 5.92e-06 erg/cm2
Error 4.67e-08 4.16e-08 6.42e-08 7.48e-07 1.28e-07 0.00e+00 erg/cm2
Peak flux Band 4.81e-01 8.67e-01 8.84e-01 5.79e-01 2.58e+00 2.81e+00 ph/cm2/s
Error 8.53e-02 6.74e-02 6.59e-02 2.02e-01 1.66e-01 4.12e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.631 0.047 - - 4.93e-03 1.23e-04 64.645 57
CPL 1.167 0.206 94.7 23.2 8.16e-03 1.80e-03 48.227 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.040 0.097 - - 2.32e-02 1.37e-03 72.612 57
CPL 0.031 0.468 108.7 30.3 6.71e-02 3.40e-02 55.435 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: 43.584000 sec.
T50 in the 50-300 keV band: 18.880000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 91.040 -2.400 88.640
T90 60.352 -0.596 59.756
T50 23.144 3.824 26.968
Peak 1.000 1.252 2.252
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
336.2885 -57.0261 0.0033 18.0 129.1 3.0898 58.5 TRIG_00324895
------------------------------------------
Foreground time interval of the image:
-2.400 13.089 (delta_t = 15.489 [sec])
Background time interval of the image:
-239.712 -2.400 (delta_t = 237.312 [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 -2.400 sec. to 88.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63089 ( -4.727578E-02 4.737890E-02) )
Norm@50keV : 4.933494E-03 ( -1.230240E-04 1.229667E-04) )
------------------------------------------------------------
Chi-Squared = 64.64508 using 59 PHA bins.
Reduced chi-squared = 1.134124 for 57 degrees of freedom
Null hypothesis probability = 0.227
Photon flux (15-150 keV) in 91.04 sec: 0.640193 ( -0.017632 0.01769 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.18555e-06 ( -1.08966e-07 1.09175e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.400 sec. to 88.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16711 ( -0.210855 0.200278 )
Epeak [keV] : 94.7177 ( -14.3747 31.9755 )
Norm@50keV : 8.164383E-03 ( -1.559872E-03 2.046005E-03) )
------------------------------------------------------------
Chi-Squared = 48.22692 using 59 PHA bins.
Reduced chi-squared = 0.8611950 for 56 degrees of freedom
Null hypothesis probability = 0.760
Photon flux (15-150 keV) in 91.04 sec: 0.617285 ( -0.019793 0.019926 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.03991e-06 ( -1.25808e-07 1.25453e-07 ) ergs/cm2
Band function
Time interval is from -2.400 sec. to 88.640 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.02447 ( -0.342159 0.684203 )
beta : -1.92776 ( -7.78422 0.479717 )
Epeak [keV] : 78.8084 ( -43.2212 33.5723 )
Norm@50keV : 9.836864E-03 ( -1.740298E-03 1.835228E-02) )
------------------------------------------------------------
Chi-Squared = 48.19916 using 59 PHA bins.
Reduced chi-squared = 0.8763483 for 55 degrees of freedom
Null hypothesis probability = 0.730
Photon flux (15-150 keV) in 91.04 sec: 0.616259 ( -0.021362 0.020252 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.0325e-06 ( -1.25207e-07 1.30296e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.252 sec. to 2.252 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04025 ( -9.748286E-02 9.639823E-02) )
Norm@50keV : 2.316778E-02 ( -1.372371E-03 1.371792E-03) )
------------------------------------------------------------
Chi-Squared = 72.61223 using 59 PHA bins.
Reduced chi-squared = 1.273899 for 57 degrees of freedom
Null hypothesis probability = 7.959E-02
Photon flux (15-150 keV) in 1.000 sec: 2.67389 ( -0.16098 0.16119 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.47144e-07 ( -1.6101e-08 1.6037e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.252 sec. to 2.252 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.054360E-02 ( -0.494036 0.442652 )
Epeak [keV] : 108.742 ( -19.0415 41.4900 )
Norm@50keV : 6.713183E-02 ( -2.443584E-02 4.348190E-02) )
------------------------------------------------------------
Chi-Squared = 55.43490 using 59 PHA bins.
Reduced chi-squared = 0.9899090 for 56 degrees of freedom
Null hypothesis probability = 0.496
Photon flux (15-150 keV) in 1.000 sec: 2.58330 ( -0.1658 0.16589 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35183e-07 ( -1.7316e-08 1.7221e-08 ) ergs/cm2
Band function
Time interval is from 1.252 sec. to 2.252 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.986831E-02 ( -0.443287 0.493589 )
beta : -9.33378 ( -0.666221 11.0178 )
Epeak [keV] : 108.684 ( -18.9848 41.5102 )
Norm@50keV : 6.718880E-02 ( -2.449555E-02 4.346592E-02) )
------------------------------------------------------------
Chi-Squared = 55.43483 using 59 PHA bins.
Reduced chi-squared = 1.007906 for 55 degrees of freedom
Null hypothesis probability = 0.458
Photon flux (15-150 keV) in 1.000 sec: 2.58309 ( -0.16561 0.16613 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35036e-07 ( -1.728e-08 1.7226e-08 ) ergs/cm2
Plot creation:
Tue Sep 16 17:57:12 EDT 2008