batgrbproduct Analysis for Trigger=338895
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 Jan 2 15:49:18 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger338895/GCN5_download_cron
======================================================================
Trigger: 00338895 Segment: 000
BAT Trigger Time: 252557749.248 [s; MET]
Trigger Stop: 252557751.296 [s; MET]
UTC: 2009-01-02T02:55:45.865380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 128.258919212618 Dec: 33.0915130874167 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.37
Image Trigger?: NO
Rate S/N Ratio: 77.517739905134 [ if not an image trigger ]
Image S/N Ratio: 9.37
Flight Position: [ source = BAT ]
RA: 128.258919212618 Dec: 33.0915130874167 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 128.247748108269 Dec: 33.1071512162273 [deg; J2000]
{ 08h 32m 59.5s , +33d 06' 25.7" }
+/- 1.37912866808242 [arcmin] (estimated 90% radius based on SNR)
+/- 0.566911347789262 [arcmin] (formal 1-sigma fit error)
SNR: 19.2168841068716
Angular difference between Flight and Ground position is 1.093465 arcmin
Partial Coding Fraction: 0.06835938 [ including projection effects ]
Duration
T90: 27.039999961853 +/- 2.24000000357628
Measured from: -11.5679998993874
to: 15.4720000624657 [s; relative to TRIGTIME]
T50: 11.2479999661446 +/- 1.63709010130248
Measured from: -6.54399991035461
to: 4.70400005578995 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.68400001525879
to: 2.68400001525879 [s; relative to TRIGTIME]
Total Fluence
Measured from: -13.9039999842644
to: 18.6560000181198 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.999959 3.350491 3.035781 1.301617
0.136760 0.146718 0.140554 0.116832 [error]
Peak 0.082198 0.256630 0.269128 0.130070
0.024365 0.031833 0.033770 0.029659 [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 7.84e-07 1.57e-06 2.44e-06 8.36e-06 6.80e-06 1.24e-05 erg/cm2
Error 7.22e-08 8.56e-08 1.39e-07 1.07e-06 3.47e-07 0.00e+00 erg/cm2
Peak flux Power-law 1.25e+00 1.68e+00 1.65e+00 2.91e+00 5.53e+00 7.49e+00 ph/cm2/s
Error 3.29e-01 2.79e-01 2.51e-01 8.99e-01 7.88e-01 1.15e+00 ph/cm2/s
Fluence Cutoff-PL 7.59e-07 1.58e-06 2.48e-06 6.90e-06 6.76e-06 9.48e-06 erg/cm2
Error 8.95e-08 9.28e-08 1.61e-07 2.40e-06 3.62e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 9.44e-01 1.82e+00 1.90e+00 1.11e+00 5.38e+00 5.78e+00 ph/cm2/s
Error 3.84e-01 3.35e-01 3.32e-01 9.52e-01 7.97e-01 1.20e+00 ph/cm2/s
Fluence Band 7.48e-07 1.58e-06 2.47e-06 6.81e-06 6.75e-06 1.02e-05 erg/cm2
Error 8.86e-08 7.10e-08 1.61e-07 2.41e-06 3.65e-07 0.00e+00 erg/cm2
Peak flux Band 9.43e-01 1.82e+00 1.90e+00 1.11e+00 5.38e+00 5.77e+00 ph/cm2/s
Error 3.84e-01 3.35e-01 2.52e-01 9.13e-01 7.97e-01 1.20e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.360 0.085 - - 2.14e-02 1.02e-03 47.644 57
CPL 1.233 0.280 335.1 5000.0 2.45e-02 7.53e-03 47.075 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.024 0.221 - - 4.80e-02 6.74e-03 61.240 57
CPL -0.181 1.126 101.3 105.8 1.72e-01 2.83e-01 56.693 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: 19.264000 sec.
T50 in the 50-300 keV band: 9.152000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 32.560 -13.904 18.656
T90 27.040 -11.568 15.472
T50 11.248 -6.544 4.704
Peak 1.000 1.684 2.684
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
128.2477 +33.1072 0.0101 45.2 46.2 10.3329 19.2 TRIG_00338895
------------------------------------------
Foreground time interval of the image:
-13.904 18.656 (delta_t = 32.560 [sec])
Background time interval of the image:
-239.248 -105.018 (delta_t = 134.230 [sec])
-104.248 -13.904 (delta_t = 90.344 [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 -13.904 sec. to 18.656 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36028 ( -8.499789E-02 8.491564E-02) )
Norm@50keV : 2.144414E-02 ( -1.016805E-03 1.016801E-03) )
------------------------------------------------------------
Chi-Squared = 47.64369 using 59 PHA bins.
Reduced chi-squared = 0.8358542 for 57 degrees of freedom
Null hypothesis probability = 0.807
Photon flux (15-150 keV) in 32.56 sec: 2.58893 ( -0.13076 0.13106 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.80374e-06 ( -3.46862e-07 3.47871e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -13.904 sec. to 18.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23296 ( -0.360646 0.200130 )
Epeak [keV] : 335.121 ( -335.111 9664.88 )
Norm@50keV : 2.454829E-02 ( -3.934387E-03 1.112470E-02) )
------------------------------------------------------------
Chi-Squared = 47.07537 using 59 PHA bins.
Reduced chi-squared = 0.8406317 for 56 degrees of freedom
Null hypothesis probability = 0.796
Photon flux (15-150 keV) in 32.56 sec: 2.56927 ( -0.06884 0.06785 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.75793e-06 ( -3.65779e-07 3.58909e-07 ) ergs/cm2
Band function
Time interval is from -13.904 sec. to 18.656 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.881965 ( -9.11803 2.68487 )
beta : -1.45179 ( -8.54821 0.156858 )
Epeak [keV] : 99.7777 ( -99.6777 9900.22 )
Norm@50keV : 3.900686E-02 ( -1.834549E-02 0.128982 )
------------------------------------------------------------
Chi-Squared = 46.53891 using 59 PHA bins.
Reduced chi-squared = 0.8461621 for 55 degrees of freedom
Null hypothesis probability = 0.785
Photon flux (15-150 keV) in 32.56 sec: 2.55282 ( -0.14144 0.14217 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.75164e-06 ( -3.65746e-07 3.65226e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.680 sec. to 2.688 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02427 ( -0.223391 0.219358 )
Norm@50keV : 4.799188E-02 ( -6.740797E-03 6.732374E-03) )
------------------------------------------------------------
Chi-Squared = 61.23987 using 59 PHA bins.
Reduced chi-squared = 1.074384 for 57 degrees of freedom
Null hypothesis probability = 0.326
Photon flux (15-150 keV) in 1.008 sec: 5.53340 ( -0.78766 0.78855 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.1823e-07 ( -7.82127e-08 7.96693e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.680 sec. to 2.688 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.180822 ( -1.26805 0.983720 )
Epeak [keV] : 101.287 ( -27.7834 183.844 )
Norm@50keV : 0.171571 ( -0.109534 0.456084 )
------------------------------------------------------------
Chi-Squared = 56.69275 using 59 PHA bins.
Reduced chi-squared = 1.012370 for 56 degrees of freedom
Null hypothesis probability = 0.449
Photon flux (15-150 keV) in 1.008 sec: 5.38020 ( -0.79602 0.79828 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.95816e-07 ( -8.45198e-08 8.44633e-08 ) ergs/cm2
Band function
Time interval is from 1.680 sec. to 2.688 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.183834 ( -0.986740 1.26247 )
beta : -9.20960 ( -8.43679 0.532363 )
Epeak [keV] : 101.144 ( -18.0881 171.379 )
Norm@50keV : 0.172156 ( -0.819473 96.4568 )
------------------------------------------------------------
Chi-Squared = 56.69268 using 59 PHA bins.
Reduced chi-squared = 1.030776 for 55 degrees of freedom
Null hypothesis probability = 0.412
Photon flux (15-150 keV) in 1.008 sec: 5.37971 ( -0.79528 0.79899 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.97814e-07 ( -8.09595e-08 8.1773e-08 ) ergs/cm2
Plot creation:
Fri Jan 2 16:19:38 EST 2009