batgrbproduct Analysis for Trigger=332516
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 Oct 24 12:42:37 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger332516/GCN5_download_cron
======================================================================
Trigger: 00332516 Segment: 000
BAT Trigger Time: 246520392.064 [s; MET]
Trigger Stop: 246520392.192 [s; MET]
UTC: 2008-10-24T05:53:08.864600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 27.8984760230204 Dec: 61.3465228980006 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.9
Image Trigger?: NO
Rate S/N Ratio: 29.4788059459674 [ if not an image trigger ]
Image S/N Ratio: 9.9
Flight Position: [ source = BAT ]
RA: 27.8984760230204 Dec: 61.3465228980006 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 27.8909435900324 Dec: 61.3523563229376 [deg; J2000]
{ 01h 51m 33.8s , +61d 21' 08.5" }
+/- 1.66107333528113 [arcmin] (estimated 90% radius based on SNR)
+/- 0.801515887705546 [arcmin] (formal 1-sigma fit error)
SNR: 14.73252638554
Angular difference between Flight and Ground position is 0.411655 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 1.82400000095367 +/- 0.586051204050593
Measured from: -1.6240000128746
to: 0.199999988079071 [s; relative to TRIGTIME]
T50: 0.664000034332275 +/- 0.32599388220523
Measured from: -0.600000023841858
to: 0.0640000104904175 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.732000023126602
to: 0.267999976873398 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.65600001811981
to: 0.267999976873398 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.040125 0.064191 0.056563 0.022374
0.006939 0.007045 0.006495 0.005571 [error]
Peak 0.029293 0.050390 0.043750 0.021535
0.005148 0.005344 0.005057 0.004260 [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 1.19e-08 2.57e-08 4.37e-08 1.71e-07 1.20e-07 2.52e-07 erg/cm2
Error 2.59e-09 3.32e-09 6.22e-09 5.50e-08 1.56e-08 5.89e-08 erg/cm2
Peak flux Power-law 2.84e-01 3.43e-01 3.00e-01 4.50e-01 1.09e+00 1.38e+00 ph/cm2/s
Error 6.27e-02 4.54e-02 4.03e-02 1.31e-01 1.25e-01 1.69e-01 ph/cm2/s
Fluence Cutoff-PL 1.19e-08 2.57e-08 4.37e-08 1.69e-07 1.20e-07 1.78e-07 erg/cm2
Error 2.66e-09 3.32e-09 6.23e-09 5.46e-08 1.56e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.84e-01 3.43e-01 3.00e-01 4.47e-01 1.08e+00 1.37e+00 ph/cm2/s
Error 6.27e-02 4.54e-02 4.04e-02 1.31e-01 1.25e-01 1.68e-01 ph/cm2/s
Fluence Band 1.18e-08 2.57e-08 4.36e-08 1.69e-07 1.20e-07 2.31e-07 erg/cm2
Error 3.17e-09 3.33e-09 6.22e-09 5.45e-08 1.56e-08 8.69e-08 erg/cm2
Peak flux Band 2.78e-01 3.50e-01 2.99e-01 4.34e-01 1.08e+00 1.36e+00 ph/cm2/s
Error 4.47e-02 5.32e-02 3.99e-02 8.21e-02 1.27e-01 1.76e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.236 0.207 - - 6.20e-03 7.13e-04 71.407 57
CPL 1.232 0.209 9998.8 5000.0 6.23e-03 7.17e-04 71.415 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.194 0.205 - - 9.25e-03 1.05e-03 63.440 57
CPL 1.190 0.206 9990.6 5000.0 9.30e-03 1.05e-03 63.457 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: 0.512000 sec.
T50 in the 50-300 keV band: 0.384000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.924 -1.656 0.268
T90 1.824 -1.624 0.200
T50 0.664 -0.600 0.064
Peak 1.000 -0.732 0.268
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
27.8909 +61.3524 0.0131 19.4 -7.7 0.1892 14.7 TRIG_00332516
------------------------------------------
Foreground time interval of the image:
-1.656 0.268 (delta_t = 1.924 [sec])
Background time interval of the image:
-240.064 -1.656 (delta_t = 238.408 [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 -1.656 sec. to 0.268 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23575 ( -0.208908 0.205737 )
Norm@50keV : 6.202812E-03 ( -7.134690E-04 7.130527E-04) )
------------------------------------------------------------
Chi-Squared = 71.40747 using 59 PHA bins.
Reduced chi-squared = 1.252763 for 57 degrees of freedom
Null hypothesis probability = 9.489E-02
Photon flux (15-150 keV) in 1.924 sec: 0.731960 ( -0.086015 0.086187 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19917e-07 ( -1.55796e-08 1.56839e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.656 sec. to 0.268 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23184 ( -0.210298 0.206985 )
Epeak [keV] : 9998.78 ( -9998.77 1.22070 )
Norm@50keV : 6.230278E-03 ( -7.165880E-04 7.175356E-04) )
------------------------------------------------------------
Chi-Squared = 71.41507 using 59 PHA bins.
Reduced chi-squared = 1.275269 for 56 degrees of freedom
Null hypothesis probability = 8.035E-02
Photon flux (15-150 keV) in 1.924 sec: 0.731731 ( -0.085991 0.08616 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19911e-07 ( -1.55663e-08 1.57104e-08 ) ergs/cm2
Band function
Time interval is from -1.656 sec. to 0.268 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.842614 ( -12.7136 2.28639 )
beta : -1.24713 ( -0.256302 0.241724 )
Epeak [keV] : 77.7674 ( -30.9633 9832.43 )
Norm@50keV : 1.193913E-02 ( -4.35244 275.691 )
------------------------------------------------------------
Chi-Squared = 71.25006 using 59 PHA bins.
Reduced chi-squared = 1.295456 for 55 degrees of freedom
Null hypothesis probability = 6.932E-02
Photon flux (15-150 keV) in 1.924 sec: 0.730701 ( -0.087771 0.086484 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19778e-07 ( -1.5523e-08 1.57553e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.732 sec. to 0.268 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19385 ( -0.206932 0.203163 )
Norm@50keV : 9.253654E-03 ( -1.045930E-03 1.045767E-03) )
------------------------------------------------------------
Chi-Squared = 63.43967 using 59 PHA bins.
Reduced chi-squared = 1.112977 for 57 degrees of freedom
Null hypothesis probability = 0.260
Photon flux (15-150 keV) in 1.000 sec: 1.08526 ( -0.125229 0.12551 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.40545e-08 ( -1.2051e-08 1.21525e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.732 sec. to 0.268 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18982 ( -0.208327 0.204409 )
Epeak [keV] : 9990.65 ( -9990.64 9.35352 )
Norm@50keV : 9.298312E-03 ( -1.051594E-03 1.051270E-03) )
------------------------------------------------------------
Chi-Squared = 63.45702 using 59 PHA bins.
Reduced chi-squared = 1.133161 for 56 degrees of freedom
Null hypothesis probability = 0.230
Photon flux (15-150 keV) in 1.000 sec: 1.08492 ( -0.125194 0.12547 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.40685e-08 ( -1.20458e-08 1.21635e-08 ) ergs/cm2
Band function
Time interval is from -0.732 sec. to 0.268 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.822418 ( -9.17758 5.51938 )
beta : -1.21012 ( -8.78988 0.218719 )
Epeak [keV] : 88.7339 ( -88.6339 9907.52 )
Norm@50keV : 1.688593E-02 ( -4.87477 442.996 )
------------------------------------------------------------
Chi-Squared = 63.32682 using 59 PHA bins.
Reduced chi-squared = 1.151397 for 55 degrees of freedom
Null hypothesis probability = 0.206
Photon flux (15-150 keV) in 1.000 sec: 1.08391 ( -0.12994 0.12308 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.39655e-08 ( -1.2031e-08 1.21925e-08 ) ergs/cm2
Plot creation:
Fri Oct 24 13:07:53 EDT 2008