batgrbproduct Analysis for Trigger=349450
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 v2.44
Process Start Time (local time): Sat Apr 18 00:47:30 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger349450/GCN5_download_cron
======================================================================
Trigger: 00349450 Segment: 000
BAT Trigger Time: 261674408 [s; MET]
Trigger Stop: 261674728 [s; MET]
UTC: 2009-04-17T15:20:03.333200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 209.706264668258 Dec: 47.000469086625 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 9.81
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 9.81
Flight Position: [ source = BAT ]
RA: 209.706264668258 Dec: 47.000469086625 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 209.626001346873 Dec: 46.951528947653 [deg; J2000]
{ 13h 58m 30.2s , +46d 57' 05.5" }
+/- 4.06302238020679 [arcmin] (estimated 90% radius based on SNR)
+/- 2.90801491938149 [arcmin] (formal 1-sigma fit error)
SNR: 4.10519496698612
Angular difference between Flight and Ground position is 4.406728 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 288.944000005722 +/- 42.327792158307
Measured from: 301.276000082493
to: 590.220000088215 [s; relative to TRIGTIME]
T50: 153.655999988317 +/- 25.3709044327823
Measured from: 373.256000101566
to: 526.912000089884 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 409.699999988079
to: 410.699999988079 [s; relative to TRIGTIME]
Total Fluence
Measured from: 278.687999993563
to: 617.076000005007 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.624295 1.483018 1.013495 0.247278
0.090181 0.090152 0.080283 0.070612 [error]
Peak 0.021063 0.009867 0.008266 0.003437
0.004981 0.004938 0.004248 0.003803 [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 4.50e-07 6.68e-07 7.40e-07 1.55e-06 2.33e-06 3.40e-06 erg/cm2
Error 4.91e-08 4.39e-08 8.21e-08 3.62e-07 1.83e-07 4.32e-07 erg/cm2
Peak flux Power-law 1.62e-01 1.00e-01 4.00e-02 2.15e-02 3.13e-01 3.24e-01 ph/cm2/s
Error 7.15e-02 4.18e-02 3.25e-02 3.69e-02 1.14e-01 1.22e-01 ph/cm2/s
Fluence Cutoff-PL 4.50e-07 6.68e-07 7.40e-07 1.53e-06 2.33e-06 3.40e-06 erg/cm2
Error 4.91e-08 4.39e-08 8.22e-08 3.59e-07 1.83e-07 4.30e-07 erg/cm2
Peak flux Cutoff-PL 1.62e-01 1.00e-01 3.99e-02 2.13e-02 3.13e-01 3.23e-01 ph/cm2/s
Error 7.15e-02 4.19e-02 3.25e-02 3.65e-02 1.14e-01 1.22e-01 ph/cm2/s
Fluence Band 4.29e-07 6.63e-07 7.67e-07 1.57e-06 2.34e-06 3.57e-06 erg/cm2
Error 2.81e-08 0.00e+00 0.00e+00 2.31e-07 1.61e-07 2.34e-07 erg/cm2
Peak flux Band 1.50e-01 1.04e-01 4.71e-02 3.02e-02 3.05e-01 3.40e-01 ph/cm2/s
Error 5.57e-02 3.83e-02 2.89e-02 2.37e-02 1.08e-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 1.852 0.137 - - 7.48e-04 5.81e-05 70.547 57
CPL 1.817 0.000 269.0 0.0 7.78e-04 2.89e-04 70.872 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.326 0.878 - - 1.77e-03 1.43e-03 56.283 57
CPL 1.991 0.000 1.1 0.0 2.80e-03 0.00e+00 56.556 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: 228.992000 sec.
T50 in the 50-300 keV band: 128.384000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 338.388 278.688 617.076
T90 288.944 301.276 590.220
T50 153.656 373.256 526.912
Peak 1.000 409.700 410.700
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
209.6260 +46.9515 0.0469 18.9 18.3 0.2963 4.1 TRIG_00349450
------------------------------------------
Foreground time interval of the image:
278.688 335.101 (delta_t = 56.413 [sec])
Background time interval of the image:
-239.000 -158.140 (delta_t = 80.860 [sec])
-157.000 278.688 (delta_t = 435.688 [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 278.688 sec. to 617.076 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85226 ( -0.134666 0.138349 )
Norm@50keV : 7.479768E-04 ( -5.858543E-05 5.753984E-05) )
------------------------------------------------------------
Chi-Squared = 70.54688 using 59 PHA bins.
Reduced chi-squared = 1.237664 for 57 degrees of freedom
Null hypothesis probability = 0.107
Photon flux (15-150 keV) in 338.4 sec: 0.105232 ( -0.00704008 0.007059 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32724e-06 ( -1.81403e-07 1.83859e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 278.688 sec. to 617.076 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81670 ( )
Epeak [keV] : 268.968 ( )
Norm@50keV : 7.783260E-04 ( -1.469394E-04 4.301397E-04) )
------------------------------------------------------------
Chi-Squared = 70.87151 using 59 PHA bins.
but latest trial 1.58883 gives Chi-Squared = 2.93780
Reduced chi-squared = 1.265563 for 56 degrees of freedom
Null hypothesis probability = 8.709E-02
Photon flux (15-150 keV) in 338.4 sec: 0.105183 ( -0.007037 0.007056 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32681e-06 ( -1.8123e-07 1.84066e-07 ) ergs/cm2
Band function
Time interval is from 278.688 sec. to 617.076 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.37649 ( -0.207387 11.0282 )
beta : -1.85063 ( -0.138392 0.134668 )
Epeak [keV] : 25.1902 ( -25.0902 9974.81 )
Norm@50keV : 1.896112E-03 ( -7.963330E-03 7.820725E-03) )
------------------------------------------------------------
Chi-Squared = 70.57533 using 59 PHA bins.
Reduced chi-squared = 1.283188 for 55 degrees of freedom
Null hypothesis probability = 7.686E-02
Photon flux (15-150 keV) in 338.4 sec: 0.713136 ( -0.534838 2178.39 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33662e-06 ( -1.56189e-07 1.66195e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 409.700 sec. to 410.700 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.32627 ( -0.774625 0.981189 )
Norm@50keV : 1.765541E-03 ( -1.765541E-03 1.102931E-03) )
------------------------------------------------------------
Chi-Squared = 56.28255 using 59 PHA bins.
Reduced chi-squared = 0.9874132 for 57 degrees of freedom
Null hypothesis probability = 0.502
Photon flux (15-150 keV) in 1.000 sec: 0.313118 ( -0.113367 0.11381 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69542e-08 ( -7.83753e-09 9.4308e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 409.700 sec. to 410.700 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99083 ( )
Epeak [keV] : 1.06373 ( )
Norm@50keV : 2.802749E-03 ( )
------------------------------------------------------------
Chi-Squared = 56.55642 using 59 PHA bins.
Reduced chi-squared = 1.009936 for 56 degrees of freedom
Null hypothesis probability = 0.454
Photon flux (15-150 keV) in 1.000 sec: 0.312963 ( -0.113328 0.113775 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69508e-08 ( -7.83648e-09 9.4175e-09 ) ergs/cm2
Band function
Time interval is from 409.700 sec. to 410.700 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.44641 ( -8.55359 6.44641 )
beta : -2.60928 ( -7.39072 0.984771 )
Epeak [keV] : 16.1981 ( -16.0981 253.947 )
Norm@50keV : 8.126185E-03 ( -243.632 557.858 )
------------------------------------------------------------
Chi-Squared = 55.80872 using 59 PHA bins.
Reduced chi-squared = 1.014704 for 55 degrees of freedom
Null hypothesis probability = 0.444
Photon flux (15-150 keV) in 1.000 sec: 0.305203 ( -0.1114 0.103717 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17528e-08 ( -4.12236e-09 6.8637e-09 ) ergs/cm2
Plot creation:
Sat Apr 18 01:08:42 EDT 2009