batgrbproduct Analysis for Trigger=356776
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 v2.45
Process Start Time (local time): Wed Jul 8 16:29:51 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger356776/GCN5_download_cron
======================================================================
Trigger: 00356776 Segment: 000
BAT Trigger Time: 268717100.16 [s; MET]
Trigger Stop: 268717104.256 [s; MET]
UTC: 2009-07-08T03:38:15.267780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 154.628878204965 Dec: 26.636688851161 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.69
Image Trigger?: NO
Rate S/N Ratio: 13.0384048104053 [ if not an image trigger ]
Image S/N Ratio: 7.69
Flight Position: [ source = BAT ]
RA: 154.628878204965 Dec: 26.636688851161 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 154.631978387851 Dec: 26.6163031736298 [deg; J2000]
{ 10h 18m 31.7s , +26d 36' 58.7" }
+/- 1.74175111282275 [arcmin] (estimated 90% radius based on SNR)
+/- 0.690030793551318 [arcmin] (formal 1-sigma fit error)
SNR: 13.7674189231396
Angular difference between Flight and Ground position is 1.234392 arcmin
Partial Coding Fraction: 0.2734375 [ including projection effects ]
Duration
T90: 14.9559999108315 +/- 3.86983673161161
Measured from: -0.49999988079071
to: 14.4560000300407 [s; relative to TRIGTIME]
T50: 6.40799993276596 +/- 1.42581907525543
Measured from: 2.31200009584427
to: 8.72000002861023 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.37199997901917
to: 4.37199997901917 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.28800004720688
to: 17.7439999580383 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.340571 0.429393 0.293480 0.059788
0.045507 0.048625 0.043519 0.039744 [error]
Peak 0.043063 0.045794 0.041127 0.005562
0.010381 0.011485 0.010140 0.008959 [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 1.25e-07 1.94e-07 2.26e-07 5.10e-07 6.94e-07 1.05e-06 erg/cm2
Error 2.35e-08 2.43e-08 4.26e-08 1.94e-07 1.01e-07 2.36e-07 erg/cm2
Peak flux Power-law 5.43e-01 4.33e-01 2.32e-01 1.82e-01 1.29e+00 1.39e+00 ph/cm2/s
Error 1.80e-01 9.92e-02 8.40e-02 1.26e-01 2.97e-01 3.23e-01 ph/cm2/s
Fluence Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 4.93e-01 4.67e-01 2.46e-01 9.42e-02 1.27e+00 1.30e+00 ph/cm2/s
Error 2.13e-01 1.24e-01 9.63e-02 3.01e-01 3.46e-01 0.00e+00 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 4.90e-01 4.64e-01 1.31e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 2.11e-01 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.776 0.219 - - 3.96e-03 5.57e-04 54.770 57
CPL 0.928 0.974 59.0 4049.8 1.12e-02 2.06e-02 52.020 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.897 0.422 - - 9.01e-03 2.51e-03 62.630 57
CPL 1.234 1.402 55.5 0.0 2.02e-02 0.00e+00 62.050 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: 8.000000 sec.
T50 in the 50-300 keV band: 4.544000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 19.032 -1.288 17.744
T90 14.956 -0.500 14.456
T50 6.408 2.312 8.720
Peak 1.000 3.372 4.372
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
154.6320 +26.6163 0.0140 42.6 -136.7 1.2886 13.8 TRIG_00356776
------------------------------------------
Foreground time interval of the image:
-1.288 17.744 (delta_t = 19.032 [sec])
Background time interval of the image:
-239.160 -1.288 (delta_t = 237.872 [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 -1.288 sec. to 17.744 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77555 ( -0.213679 0.223751 )
Norm@50keV : 3.95968E-03 ( -0.000562049 0.000551587 )
------------------------------------------------------------
# Chi-Squared = 54.77 using 59 PHA bins.
# Reduced chi-squared = 0.9609 for 57 degrees of freedom
# Null hypothesis probability = 5.592009e-01
Photon flux (15-150 keV) in 19.03 sec: 0.540553 ( -0.0683929 0.0684538 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.94399e-07 ( -9.99619e-08 1.01561e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.288 sec. to 17.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.927582 ( -1.07623 0.872766 )
Epeak [keV] : 58.9764 ( -15.1491 8084.41 )
Norm@50keV : 1.12443E-02 ( -0.0112444 0.0299315 )
------------------------------------------------------------
# Chi-Squared = 52.02 using 59 PHA bins.
# Reduced chi-squared = 0.9290 for 56 degrees of freedom
# Null hypothesis probability = 6.260728e-01
Photon flux (15-150 keV) in 19.03 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -1.288 sec. to 17.744 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.927696 ( -7.59618 1.34062 )
beta : -10.00000 ( 2.6115e+11 2.6115e+11 )
Epeak [keV] : 58.9725 ( -15.1553 1616.05 )
Norm@50keV : 1.12414E-02 ( -0.0112413 0.0299578 )
------------------------------------------------------------
# Chi-Squared = 52.02 using 59 PHA bins.
# Reduced chi-squared = 0.9459 for 55 degrees of freedom
# Null hypothesis probability = 5.890254e-01
Photon flux (15-150 keV) in 19.03 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 3.372 sec. to 4.372 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89706 ( -0.391601 0.452824 )
Norm@50keV : 9.00721E-03 ( -0.0025835 0.00243584 )
------------------------------------------------------------
# Chi-Squared = 62.63 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 57 degrees of freedom
# Null hypothesis probability = 2.833165e-01
Photon flux (15-150 keV) in 1 sec: 1.29102 ( -0.296589 0.296697 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.28072e-08 ( -2.23693e-08 2.30411e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.372 sec. to 4.372 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23376 ( -1.86971 0.934776 )
Epeak [keV] : 55.4669 ( )
Norm@50keV : 2.02264E-02 ( )
------------------------------------------------------------
# Chi-Squared = 62.05 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 56 degrees of freedom
# Null hypothesis probability = 2.694519e-01
Photon flux (15-150 keV) in 1 sec: 1.27010 ( -0.300581 0.30077 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.08748e-08 ( -2.23177e-08 2.34812e-08 ) ergs/cm2
Band function
Time interval is from 3.372 sec. to 4.372 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.23698 ( 1.45256 2.11765 )
beta : -10.00000 ( 3.66317e+11 3.66317e+11 )
Epeak [keV] : 55.6166 ( -54.6207 -55.6176 )
Norm@50keV : 2.01257E-02 ( -0.0201258 0.156838 )
------------------------------------------------------------
# Chi-Squared = 62.05 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 55 degrees of freedom
# Null hypothesis probability = 2.394427e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Wed Jul 8 16:44:07 EDT 2009