batgrbproduct Analysis for Trigger=361218
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): Sun Aug 30 12:06:21 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger361218/GCN5_download_cron
======================================================================
Trigger: 00361218 Segment: 000
BAT Trigger Time: 273265925.376 [s; MET]
Trigger Stop: 273265933.568 [s; MET]
UTC: 2009-08-29T19:12:00.335820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 301.246453215108 Dec: 45.9715152415344 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.67
Image Trigger?: NO
Rate S/N Ratio: 8.77496438739212 [ if not an image trigger ]
Image S/N Ratio: 5.67
Flight Position: [ source = BAT ]
RA: 301.246453215108 Dec: 45.9715152415344 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 301.214591630277 Dec: 45.9856035915697 [deg; J2000]
{ 20h 04m 51.5s , +45d 59' 08.2" }
+/- 3.14067347762765 [arcmin] (estimated 90% radius based on SNR)
+/- 1.65996729516796 [arcmin] (formal 1-sigma fit error)
SNR: 5.93042512577589
Angular difference between Flight and Ground position is 1.574617 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 8.19200003147125 +/-
Measured from: 0
to: 8.19200003147125 [s; relative to TRIGTIME]
T50: 8.19200003147125 +/-
Measured from: 0
to: 8.19200003147125 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 8.19200003147125 second)
Measured from: 0
to: 8.19200003147125 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 8.19200003147125 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.037273 0.043961 0.035524 0.012794
0.016238 0.016353 0.014136 0.012109 [error]
Peak 0.037273 0.043961 0.035524 0.012794
0.016238 0.016353 0.014136 0.012109 [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 8.99e-09 1.82e-08 2.86e-08 9.96e-08 7.96e-08 1.55e-07 erg/cm2
Error 5.87e-09 7.22e-09 1.37e-08 1.35e-07 3.36e-08 1.30e-07 erg/cm2
Peak flux Power-law 3.53e-02 3.89e-02 3.06e-02 3.98e-02 1.20e-01 1.45e-01 ph/cm2/s
Error 2.35e-02 1.59e-02 1.42e-02 4.35e-02 4.39e-02 5.60e-02 ph/cm2/s
Fluence Cutoff-PL 8.99e-09 1.82e-08 2.86e-08 9.87e-08 7.96e-08 1.55e-07 erg/cm2
Error 5.88e-09 7.23e-09 1.37e-08 1.34e-07 3.36e-08 1.29e-07 erg/cm2
Peak flux Cutoff-PL 3.52e-02 3.89e-02 3.06e-02 3.95e-02 1.20e-01 1.44e-01 ph/cm2/s
Error 2.35e-02 1.59e-02 1.42e-02 4.32e-02 4.38e-02 5.58e-02 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 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.345 0.735 - - 9.93e-04 3.69e-04 75.090 57
CPL 2.032 0.000 12.3 0.0 4.11e-04 0.00e+00 75.030 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.345 0.735 - - 9.93e-04 3.69e-04 75.090 57
CPL 2.032 0.000 12.3 0.0 4.11e-04 0.00e+00 75.030 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 8.192 0.000 8.192
T90 8.192 0.000 8.192
T50 8.192 0.000 8.192
Peak 8.192 0.000 8.192
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
301.2146 +45.9856 0.0324 10.9 -45.4 0.1945 5.9 TRIG_00361218
------------------------------------------
Foreground time interval of the image:
0.000 8.192 (delta_t = 8.192 [sec])
Background time interval of the image:
-60.376 -29.376 (delta_t = 31.000 [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 0.000 sec. to 8.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34532 ( -0.760704 0.710061 )
Norm@50keV : 9.93435E-04 ( -0.000374422 0.000363401 )
------------------------------------------------------------
# Chi-Squared = 75.09 using 59 PHA bins.
# Reduced chi-squared = 1.317 for 57 degrees of freedom
# Null hypothesis probability = 5.439626e-02
Photon flux (15-150 keV) in 8.192 sec: 0.119563 ( -0.0438098 0.0438954 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.95722e-08 ( -3.2787e-08 3.43499e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03215 ( )
Epeak [keV] : 12.2722 ( )
Norm@50keV : 4.11383E-04 ( )
------------------------------------------------------------
# Chi-Squared = 75.03 using 59 PHA bins.
# Reduced chi-squared = 1.340 for 56 degrees of freedom
# Null hypothesis probability = 4.563581e-02
Photon flux (15-150 keV) in 8.192 sec: 0.119520 ( -0.0437981 0.043882 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.9556e-08 ( -3.27904e-08 3.43652e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.00133 ( 0.959108 0.959108 )
beta : -1.44832 ( 1.38129 0.786984 )
Epeak [keV] : 24.2706 ( -73.4457 -73.4457 )
Norm@50keV : 20.2543 ( -28.0631 32.9673 )
------------------------------------------------------------
# Chi-Squared = 74.81 using 59 PHA bins.
# Reduced chi-squared = 1.360 for 55 degrees of freedom
# Null hypothesis probability = 3.904940e-02
Photon flux (15-150 keV) in 8.192 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 0.000 sec. to 8.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34532 ( -0.760704 0.710061 )
Norm@50keV : 9.93435E-04 ( -0.000374422 0.000363401 )
------------------------------------------------------------
# Chi-Squared = 75.09 using 59 PHA bins.
# Reduced chi-squared = 1.317 for 57 degrees of freedom
# Null hypothesis probability = 5.439626e-02
Photon flux (15-150 keV) in 8.192 sec: 0.119563 ( -0.0438098 0.0438954 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.95722e-08 ( -3.2787e-08 3.43499e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03215 ( )
Epeak [keV] : 12.2722 ( )
Norm@50keV : 4.11383E-04 ( )
------------------------------------------------------------
# Chi-Squared = 75.03 using 59 PHA bins.
# Reduced chi-squared = 1.340 for 56 degrees of freedom
# Null hypothesis probability = 4.563581e-02
Photon flux (15-150 keV) in 8.192 sec: 0.119520 ( -0.0437981 0.043882 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.9556e-08 ( -3.27904e-08 3.43652e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.00133 ( 0.959108 0.959108 )
beta : -1.44832 ( 1.38129 0.786984 )
Epeak [keV] : 24.2706 ( -73.4457 -73.4457 )
Norm@50keV : 20.2543 ( -28.0631 32.9673 )
------------------------------------------------------------
# Chi-Squared = 74.81 using 59 PHA bins.
# Reduced chi-squared = 1.360 for 55 degrees of freedom
# Null hypothesis probability = 3.904940e-02
Photon flux (15-150 keV) in 8.192 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sun Aug 30 12:23:10 EDT 2009