batgrbproduct Analysis for Trigger=335715
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): Thu Nov 27 18:58:43 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger335715/GCN5_download_cron
======================================================================
Trigger: 00335715 Segment: 000
BAT Trigger Time: 249462312.192 [s; MET]
Trigger Stop: 249462320.384 [s; MET]
UTC: 2008-11-27T07:05:08.903800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 332.09265321205 Dec: 6.85939107792509 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.25
Image Trigger?: NO
Rate S/N Ratio: 8.42614977317636 [ if not an image trigger ]
Image S/N Ratio: 7.25
Flight Position: [ source = BAT ]
RA: 332.09265321205 Dec: 6.85939107792509 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 332.082840080759 Dec: 6.83770416313071 [deg; J2000]
{ 22h 08m 19.9s , +06d 50' 15.7" }
+/- 2.38238364977589 [arcmin] (estimated 90% radius based on SNR)
+/- 1.08748172396242 [arcmin] (formal 1-sigma fit error)
SNR: 8.8009638538036
Angular difference between Flight and Ground position is 1.426500 arcmin
Partial Coding Fraction: 0.515625 [ including projection effects ]
Duration
T90: 17.3120000064373 +/- 3.73930742859045
Measured from: -9.23199990391731
to: 8.08000010251999 [s; relative to TRIGTIME]
T50: 6.05200001597404 +/- 3.41756463780518
Measured from: -4.01599991321564
to: 2.03600010275841 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -4.59200000762939
to: -3.59200000762939 [s; relative to TRIGTIME]
Total Fluence
Measured from: -10.3959999978542
to: 8.51199999451637 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.297718 0.196329 0.173517 -0.004799
0.035025 0.035130 0.032249 0.029841 [error]
Peak 0.033728 0.023741 0.008532 0.007807
0.008097 0.007916 0.007541 0.007064 [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 9.02e-08 1.17e-07 1.12e-07 1.89e-07 3.82e-07 5.13e-07 erg/cm2
Error 1.96e-08 1.78e-08 3.20e-08 1.09e-07 7.12e-08 1.44e-07 erg/cm2
Peak flux Power-law 4.08e-01 2.08e-01 6.56e-02 2.64e-02 6.96e-01 7.07e-01 ph/cm2/s
Error 1.54e-01 8.19e-02 5.37e-02 4.51e-02 2.13e-01 2.20e-01 ph/cm2/s
Fluence Cutoff-PL 9.02e-08 1.17e-07 1.12e-07 1.88e-07 3.82e-07 5.05e-07 erg/cm2
Error 1.96e-08 1.78e-08 3.21e-08 1.09e-07 7.13e-08 1.43e-07 erg/cm2
Peak flux Cutoff-PL 4.07e-01 2.08e-01 6.55e-02 2.62e-02 6.96e-01 7.07e-01 ph/cm2/s
Error 1.54e-01 8.19e-02 5.37e-02 4.48e-02 2.13e-01 2.20e-01 ph/cm2/s
Fluence Band 8.87e-08 1.17e-07 1.13e-07 1.92e-07 3.83e-07 5.12e-07 erg/cm2
Error 1.81e-08 1.84e-08 2.84e-08 1.15e-07 6.90e-08 1.07e-07 erg/cm2
Peak flux Band 4.07e-01 2.08e-01 6.55e-02 2.62e-02 6.96e-01 7.08e-01 ph/cm2/s
Error 1.54e-01 8.19e-02 5.36e-02 4.48e-02 2.13e-01 2.20e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.068 0.319 - - 2.18e-03 4.45e-04 59.700 57
CPL 1.999 0.336 1.8 0.0 2.29e-03 4.48e-04 59.822 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.666 0.873 - - 3.19e-03 1.99e-03 67.561 57
CPL 1.980 0.534 1.1 0.0 8.44e-03 0.00e+00 67.942 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 18.908 -10.396 8.512
T90 17.312 -9.232 8.080
T50 6.052 -4.016 2.036
Peak 1.000 -4.592 -3.592
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
332.0828 +6.8377 0.0218 42.5 -171.4 0.6296 8.8 TRIG_00335715
------------------------------------------
Foreground time interval of the image:
-10.396 8.512 (delta_t = 18.908 [sec])
Background time interval of the image:
-239.192 -81.102 (delta_t = 158.090 [sec])
-80.192 -17.222 (delta_t = 62.970 [sec])
-16.192 -10.396 (delta_t = 5.796 [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 -10.396 sec. to 8.512 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.06808 ( -0.302285 0.334939 )
Norm@50keV : 2.183224E-03 ( -4.572816E-04 4.329209E-04) )
------------------------------------------------------------
Chi-Squared = 59.70010 using 59 PHA bins.
Reduced chi-squared = 1.047370 for 57 degrees of freedom
Null hypothesis probability = 0.378
Photon flux (15-150 keV) in 18.91 sec: 0.338166 ( -0.050442 0.050468 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.82447e-07 ( -7.00824e-08 7.23856e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.396 sec. to 8.512 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99939 ( -0.665569 5.435228E-03) )
Epeak [keV] : 1.76101 ( )
Norm@50keV : 2.292541E-03 ( -4.468315E-04 4.485114E-04) )
------------------------------------------------------------
Chi-Squared = 59.82159 using 59 PHA bins.
but latest trial 2.00483 gives Chi-Squared = 5.519867E-03
Reduced chi-squared = 1.068243 for 56 degrees of freedom
Null hypothesis probability = 0.339
Photon flux (15-150 keV) in 18.91 sec: 0.338030 ( -0.050424 0.05045 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.82358e-07 ( -7.00691e-08 7.24423e-08 ) ergs/cm2
Band function
Time interval is from -10.396 sec. to 8.512 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.99209 ( -7.59624 7.40376 )
beta : -8.84157 ( -0.334942 0.302273 )
Epeak [keV] : 10.3908 ( -10.2908 9989.61 )
Norm@50keV : 2.330428E-03 ( -6.216300E-02 5.884561E-02) )
------------------------------------------------------------
Chi-Squared = 59.83392 using 59 PHA bins.
Reduced chi-squared = 1.087890 for 55 degrees of freedom
Null hypothesis probability = 0.305
Photon flux (15-150 keV) in 18.91 sec: 0.338030 ( -0.050423 0.050449 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.83457e-07 ( -6.74198e-08 7.06156e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -4.592 sec. to -3.592 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.66578 ( -0.716822 1.02820 )
Norm@50keV : 3.188911E-03 ( -1.951896E-03 2.021759E-03) )
------------------------------------------------------------
Chi-Squared = 67.56051 using 59 PHA bins.
Reduced chi-squared = 1.185272 for 57 degrees of freedom
Null hypothesis probability = 0.160
Photon flux (15-150 keV) in 1.000 sec: 0.695862 ( -0.213157 0.213514 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.35802e-08 ( -1.32486e-08 1.51344e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.592 sec. to -3.592 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97971 ( -0.699476 0.368762 )
Epeak [keV] : 1.10395 ( )
Norm@50keV : 8.439258E-03 ( )
------------------------------------------------------------
Chi-Squared = 67.94209 using 59 PHA bins.
but latest trial 1.37291 gives Chi-Squared = 0.512405
Reduced chi-squared = 1.213252 for 56 degrees of freedom
Null hypothesis probability = 0.132
Photon flux (15-150 keV) in 1.000 sec: 0.695567 ( -0.213077 0.213437 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.35171e-08 ( -1.31907e-08 1.51871e-08 ) ergs/cm2
Band function
Time interval is from -4.592 sec. to -3.592 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.67155 ( -7.07022 7.92978 )
beta : -9.31763 ( -1.02828 0.716770 )
Epeak [keV] : 14.1763 ( -14.0763 9985.82 )
Norm@50keV : 1.178018E-02 ( -0.265142 0.274802 )
------------------------------------------------------------
Chi-Squared = 68.27358 using 59 PHA bins.
Reduced chi-squared = 1.241338 for 55 degrees of freedom
Null hypothesis probability = 0.108
Photon flux (15-150 keV) in 1.000 sec: 0.695571 ( -0.213081 0.213435 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.36125e-08 ( -1.21697e-08 1.01995e-08 ) ergs/cm2
Plot creation:
Thu Nov 27 19:25:00 EST 2008