batgrbproduct Analysis for Trigger=321177
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 Aug 22 19:39:59 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger321177/GCN5_download_cron
======================================================================
Trigger: 00321177 Segment: 000
BAT Trigger Time: 241103575.736 [s; MET]
Trigger Stop: 241103575.752 [s; MET]
UTC: 2008-08-22T13:12:52.697440 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 75.2646438449587 Dec: 45.2722548248199 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 17.45
Image Trigger?: NO
Rate S/N Ratio: 117.520211027721 [ if not an image trigger ]
Image S/N Ratio: 17.45
Flight Position: [ source = BAT ]
RA: 75.2646438449587 Dec: 45.2722548248199 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 75.2766899208677 Dec: 45.2685350372454 [deg; J2000]
{ 05h 01m 06.4s , +45d 16' 06.7" }
+/- 1.0119073300246 [arcmin] (estimated 90% radius based on SNR)
+/- 0.381207991667399 [arcmin] (formal 1-sigma fit error)
SNR: 29.9071110314566
Angular difference between Flight and Ground position is 0.555465 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.0720000267028809 +/- 0.017888553416166
Measured from: -0.00399991869926453
to: 0.0680001080036163 [s; relative to TRIGTIME]
T50: 0.0360000133514404 +/- 0.00400000810623169
Measured from: 0.00400009751319885
to: 0.0400001108646393 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.472000002861023
to: 0.527999997138977 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0279999971389771
to: 0.0800000131130219 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.081947 0.072389 0.025144 0.002117
0.003844 0.003648 0.002588 0.001301 [error]
Peak 0.083154 0.072263 0.025278 0.001839
0.003877 0.003670 0.002609 0.001325 [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 2.80e-08 1.67e-08 6.34e-09 3.21e-09 5.27e-08 5.42e-08 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 Power-law 8.44e+00 2.84e+00 5.38e-01 1.19e-01 1.19e+01 1.19e+01 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 2.15e-08 3.19e-08 1.31e-08 8.84e-10 6.73e-08 6.71e-08 erg/cm2
Error 2.46e-09 2.32e-09 1.84e-09 3.38e-10 4.25e-09 4.27e-09 erg/cm2
Peak flux Cutoff-PL 8.44e+00 2.84e+00 5.38e-01 1.19e-01 1.19e+01 1.19e+01 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Fluence Band 2.12e-08 3.17e-08 1.31e-08 8.95e-10 6.72e-08 6.15e-08 erg/cm2
Error 1.82e-09 2.13e-09 1.26e-09 2.20e-10 4.18e-09 3.86e-09 erg/cm2
Peak flux Band 6.28e+00 5.29e+00 1.14e+00 3.75e-02 1.26e+01 1.27e+01 ph/cm2/s
Error 8.25e-01 3.33e-01 1.36e-01 9.12e-03 7.95e-01 8.62e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.396 0.000 - - 3.30e-02 0.00e+00 239.859 57
CPL 0.044 0.491 29.6 3.3 2.25e+00 1.49e+00 69.282 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.402 0.000 - - 3.18e-02 0.00e+00 242.556 57
CPL 0.044 0.490 29.5 3.3 2.20e+00 1.45e+00 70.457 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.108 -0.028 0.080
T90 0.072 -0.004 0.068
T50 0.036 0.004 0.040
Peak 1.000 -0.472 0.528
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
75.2767 +45.2685 0.0064 0.0 -104.2 0.1795 29.9 TRIG_00321177
------------------------------------------
Foreground time interval of the image:
-0.028 0.080 (delta_t = 0.108 [sec])
Background time interval of the image:
-119.736 -78.466 (delta_t = 41.270 [sec])
-77.736 -0.028 (delta_t = 77.708 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.028 sec. to 0.080 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.39566 ( )
Norm@50keV : 3.298196E-02 ( )
------------------------------------------------------------
Chi-Squared = 239.8594 using 59 PHA bins.
Reduced chi-squared = 4.208060 for 57 degrees of freedom
Null hypothesis probability = 2.747E-24
Photon flux (15-150 keV) in 0.1080 sec: 12.2679 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.26559e-08 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.028 sec. to 0.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.352782E-02 ( -0.513707 0.467578 )
Epeak [keV] : 29.6295 ( -3.61019 3.08031 )
Norm@50keV : 2.25415 ( -0.971299 2.00359 )
------------------------------------------------------------
Chi-Squared = 69.28181 using 59 PHA bins.
Reduced chi-squared = 1.237175 for 56 degrees of freedom
Null hypothesis probability = 0.109
Photon flux (15-150 keV) in 0.1080 sec: 13.0130 ( -0.8851 0.8905 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.72691e-08 ( -4.2565e-09 4.24958e-09 ) ergs/cm2
Band function
Time interval is from -0.028 sec. to 0.080 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.50189 ( -3.305554E-02 7.319939E-02) )
beta : -9.35593 ( )
Epeak [keV] : 13.1722 ( )
Norm@50keV : 0.406076 ( )
------------------------------------------------------------
Chi-Squared = 98.79076 using 59 PHA bins.
Reduced chi-squared = 1.796196 for 55 degrees of freedom
Null hypothesis probability = 2.671E-04
Photon flux (15-150 keV) in 0.1080 sec: 13.0456 ( -0.9172 0.8142 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.71685e-08 ( -4.20984e-09 4.1445e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.028 sec. to 0.084 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.40169 ( )
Norm@50keV : 3.182993E-02 ( )
------------------------------------------------------------
Chi-Squared = 242.5557 using 59 PHA bins.
Reduced chi-squared = 4.255363 for 57 degrees of freedom
Null hypothesis probability = 9.670E-25
Photon flux (15-150 keV) in 0.1120 sec: 11.8939 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.28898e-08 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.028 sec. to 0.084 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.420604E-02 ( -0.512569 0.467354 )
Epeak [keV] : 29.5385 ( -3.60850 3.07410 )
Norm@50keV : 2.20317 ( -0.949568 1.95443 )
------------------------------------------------------------
Chi-Squared = 70.45722 using 59 PHA bins.
Reduced chi-squared = 1.258165 for 56 degrees of freedom
Null hypothesis probability = 9.253E-02
Photon flux (15-150 keV) in 0.1120 sec: 11.8949 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.77422e-08 ( -4.28299e-09 4.28142e-09 ) ergs/cm2
Band function
Time interval is from -0.028 sec. to 0.084 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48967 ( -2.976251E-02 8.630371E-02) )
beta : -9.27526 ( -0.724736 3.83135 )
Epeak [keV] : 13.4809 ( -3.04380 3.76041 )
Norm@50keV : 0.398042 ( -0.803044 2.15551 )
------------------------------------------------------------
Chi-Squared = 99.52627 using 59 PHA bins.
Reduced chi-squared = 1.809569 for 55 degrees of freedom
Null hypothesis probability = 2.235E-04
Photon flux (15-150 keV) in 0.1120 sec: 12.5667 ( -0.8121 0.7779 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.59991e-08 ( -4.08173e-09 4.07758e-09 ) ergs/cm2
Plot creation:
Fri Aug 22 19:55:32 EDT 2008