batgrbproduct Analysis for Trigger=337914
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): Mon Dec 22 11:04:53 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger337914/GCN5_download_cron
======================================================================
Trigger: 00337914 Segment: 000
BAT Trigger Time: 251614443.328 [s; MET]
Trigger Stop: 251614443.584 [s; MET]
UTC: 2008-12-22T04:53:59.974180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 22.7514205034355 Dec: -34.1283751474552 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.08
Image Trigger?: NO
Rate S/N Ratio: 22.0454076850486 [ if not an image trigger ]
Image S/N Ratio: 8.08
Flight Position: [ source = BAT ]
RA: 22.7514205034355 Dec: -34.1283751474552 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 22.7478644353314 Dec: -34.0948534536752 [deg; J2000]
{ 01h 30m 59.5s , -34d 05' 41.5" }
+/- 0.449666037177108 [arcmin] (estimated 90% radius based on SNR)
+/- 0.129482890134444 [arcmin] (formal 1-sigma fit error)
SNR: 95.2773532733944
Angular difference between Flight and Ground position is 2.019045 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 24.8039999902248 +/- 2.67925362789246
Measured from: 0.988000094890594
to: 25.7920000851154 [s; relative to TRIGTIME]
T50: 5.24399998784065 +/- 0.198595054280031
Measured from: 3.12000009417534
to: 8.36400008201599 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.44799998402596
to: 4.44799998402596 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.648000001907349
to: 38.0479999780655 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.124497 2.999067 2.348768 0.460318
0.034339 0.036573 0.033008 0.025296 [error]
Peak 0.220042 0.359870 0.336651 0.070223
0.007718 0.009100 0.008797 0.005862 [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 6.46e-07 1.20e-06 1.72e-06 5.21e-06 4.90e-06 8.79e-06 erg/cm2
Error 2.50e-08 2.68e-08 3.66e-08 2.59e-07 9.15e-08 2.74e-07 erg/cm2
Peak flux Power-law 2.12e+00 2.47e+00 2.06e+00 2.90e+00 7.70e+00 9.56e+00 ph/cm2/s
Error 1.24e-01 8.69e-02 7.12e-02 2.13e-01 2.39e-01 2.95e-01 ph/cm2/s
Fluence Cutoff-PL 5.76e-07 1.22e-06 1.78e-06 3.28e-06 4.79e-06 6.48e-06 erg/cm2
Error 3.38e-08 2.84e-08 4.36e-08 5.29e-07 1.01e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.81e+00 2.55e+00 2.20e+00 1.66e+00 7.45e+00 8.22e+00 ph/cm2/s
Error 1.58e-01 9.54e-02 8.80e-02 3.18e-01 2.53e-01 4.17e-01 ph/cm2/s
Fluence Band 5.72e-07 1.21e-06 1.78e-06 3.26e-06 4.78e-06 6.83e-06 erg/cm2
Error 3.34e-08 2.83e-08 4.35e-08 5.29e-07 1.01e-07 5.34e-07 erg/cm2
Peak flux Band 1.81e+00 2.55e+00 2.20e+00 1.66e+00 7.45e+00 8.22e+00 ph/cm2/s
Error 1.58e-01 9.54e-02 8.80e-02 3.18e-01 2.53e-01 4.17e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.482 0.035 - - 1.33e-02 2.43e-04 68.198 57
CPL 1.076 0.151 131.1 31.3 2.00e-02 2.97e-03 45.676 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.259 0.052 - - 6.50e-02 1.93e-03 80.443 57
CPL 0.643 0.231 123.3 28.9 1.24e-01 2.94e-02 56.773 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: 15.680000 sec.
T50 in the 50-300 keV band: 4.416000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 38.696 -0.648 38.048
T90 24.804 0.988 25.792
T50 5.244 3.120 8.364
Peak 1.000 3.448 4.448
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
22.7479 -34.0949 0.0020 11.3 177.2 5.7346 95.3 TRIG_00337914
------------------------------------------
Foreground time interval of the image:
-0.648 7.673 (delta_t = 8.321 [sec])
Background time interval of the image:
-119.328 -0.648 (delta_t = 118.680 [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 -0.648 sec. to 38.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48197 ( -3.465772E-02 3.461933E-02) )
Norm@50keV : 1.330853E-02 ( -2.429420E-04 2.428861E-04) )
------------------------------------------------------------
Chi-Squared = 68.19811 using 59 PHA bins.
Reduced chi-squared = 1.196458 for 57 degrees of freedom
Null hypothesis probability = 0.147
Photon flux (15-150 keV) in 38.70 sec: 1.65350 ( -0.03484 0.03495 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.90074e-06 ( -9.14868e-08 9.14481e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.648 sec. to 38.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07631 ( -0.153816 0.149159 )
Epeak [keV] : 131.110 ( -20.7406 41.9249 )
Norm@50keV : 1.996809E-02 ( -2.706699E-03 3.229611E-03) )
------------------------------------------------------------
Chi-Squared = 45.67552 using 59 PHA bins.
Reduced chi-squared = 0.8156343 for 56 degrees of freedom
Null hypothesis probability = 0.836
Photon flux (15-150 keV) in 38.70 sec: 1.59768 ( -0.03914 0.03947 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.78765e-06 ( -1.02323e-07 9.97686e-08 ) ergs/cm2
Band function
Time interval is from -0.648 sec. to 38.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07639 ( -0.149051 0.153937 )
beta : -8.24111 ( -1.75889 6.57367 )
Epeak [keV] : 131.112 ( -20.7496 41.8927 )
Norm@50keV : 1.996412E-02 ( -2.704684E-03 3.232803E-03) )
------------------------------------------------------------
Chi-Squared = 45.67556 using 59 PHA bins.
Reduced chi-squared = 0.8304648 for 55 degrees of freedom
Null hypothesis probability = 0.811
Photon flux (15-150 keV) in 38.70 sec: 1.59774 ( -0.03929 0.03953 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.78262e-06 ( -1.01084e-07 1.00697e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 3.448 sec. to 4.448 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25931 ( -5.239356E-02 5.239201E-02) )
Norm@50keV : 6.498356E-02 ( -1.934379E-03 1.934491E-03) )
------------------------------------------------------------
Chi-Squared = 80.44316 using 59 PHA bins.
Reduced chi-squared = 1.411283 for 57 degrees of freedom
Null hypothesis probability = 2.213E-02
Photon flux (15-150 keV) in 1.000 sec: 7.69758 ( -0.23891 0.2392 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.4877e-07 ( -2.1162e-08 2.1231e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.448 sec. to 4.448 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.642665 ( -0.237739 0.224921 )
Epeak [keV] : 123.269 ( -19.5711 38.3126 )
Norm@50keV : 0.123641 ( -2.523518E-02 3.359986E-02) )
------------------------------------------------------------
Chi-Squared = 56.77298 using 59 PHA bins.
Reduced chi-squared = 1.013803 for 56 degrees of freedom
Null hypothesis probability = 0.446
Photon flux (15-150 keV) in 1.000 sec: 7.45207 ( -0.25194 0.25328 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.28303e-07 ( -2.2828e-08 2.2787e-08 ) ergs/cm2
Band function
Time interval is from 3.448 sec. to 4.448 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.642463 ( -0.225081 0.237600 )
beta : -8.25039 ( -1.74961 6.61985 )
Epeak [keV] : 123.245 ( -19.5548 38.3138 )
Norm@50keV : 0.123657 ( -2.525391E-02 3.359733E-02) )
------------------------------------------------------------
Chi-Squared = 56.77322 using 59 PHA bins.
Reduced chi-squared = 1.032240 for 55 degrees of freedom
Null hypothesis probability = 0.409
Photon flux (15-150 keV) in 1.000 sec: 7.45278 ( -0.25269 0.25258 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.27983e-07 ( -2.2857e-08 2.2727e-08 ) ergs/cm2
Plot creation:
Mon Dec 22 11:17:15 EST 2008