batgrbproduct Analysis for Trigger=348720
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 v2.44
Process Start Time (local time): Thu Apr 9 00:06:15 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger348720/GCN5_download_cron
======================================================================
Trigger: 00348720 Segment: 000
BAT Trigger Time: 260895736 [s; MET]
Trigger Stop: 260895800 [s; MET]
UTC: 2009-04-08T15:02:11.357900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 231.617816208264 Dec: 37.5641345926912 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.15
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.15
Flight Position: [ source = BAT ]
RA: 231.617816208264 Dec: 37.5641345926912 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 231.547213842575 Dec: 37.5182325728855 [deg; J2000]
{ 15h 26m 11.3s , +37d 31' 05.6" }
+/- 4.15714399583638 [arcmin] (estimated 90% radius based on SNR)
+/- 2.87171411175886 [arcmin] (formal 1-sigma fit error)
SNR: 3.97306276376221
Angular difference between Flight and Ground position is 4.343663 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.232418 0.057031 0.003578 -0.007214
0.037485 0.037501 0.034075 0.030218 [error]
Peak 0.232418 0.057031 0.003578 -0.007214
0.037485 0.037501 0.034075 0.030218 [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 4.95e-08 3.41e-08 1.54e-08 9.67e-09 1.04e-07 1.09e-07 erg/cm2
Error 1.52e-08 1.70e-08 1.76e-08 2.04e-08 4.54e-08 5.56e-08 erg/cm2
Peak flux Power-law 2.58e-02 1.00e-02 2.27e-03 6.16e-04 3.85e-02 3.88e-02 ph/cm2/s
Error 8.02e-03 4.77e-03 2.52e-03 1.20e-03 1.25e-02 1.27e-02 ph/cm2/s
Fluence Cutoff-PL 5.87e-08 2.61e-08 3.93e-10 1.23e-14 8.53e-08 8.51e-08 erg/cm2
Error 1.71e-08 1.31e-08 6.29e-09 8.06e-10 2.81e-08 2.75e-08 erg/cm2
Peak flux Cutoff-PL 3.01e-02 8.41e-03 7.06e-05 1.17e-09 3.86e-02 3.86e-02 ph/cm2/s
Error 8.94e-03 5.45e-03 9.68e-04 6.33e-05 1.13e-02 1.13e-02 ph/cm2/s
Fluence Band 4.86e-08 3.36e-08 6.63e-09 3.81e-10 9.05e-08 1.16e-07 erg/cm2
Error 1.51e-08 8.94e-09 1.04e-08 6.30e-09 3.08e-08 4.77e-08 erg/cm2
Peak flux Band 2.96e-02 9.33e-03 5.41e-04 3.14e-05 3.95e-02 3.95e-02 ph/cm2/s
Error 8.70e-03 4.95e-03 1.41e-03 5.73e-04 1.17e-02 1.17e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.123 0.837 - - 1.28e-04 1.18e-04 52.133 57
CPL -2.493 0.000 17.9 4.1 4.27e+00 1.89e+01 48.543 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.123 0.837 - - 1.28e-04 1.18e-04 52.133 57
CPL -2.493 0.000 17.9 4.1 4.27e+00 1.89e+01 48.543 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
231.5472 +37.5182 0.0485 6.5 152.9 0.2942 4.0 TRIG_00348720
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.12316 ( -0.690910 0.982254 )
Norm@50keV : 1.282184E-04 ( -1.282184E-04 1.068198E-04) )
------------------------------------------------------------
Chi-Squared = 52.13254 using 59 PHA bins.
Reduced chi-squared = 0.9146060 for 57 degrees of freedom
Null hypothesis probability = 0.658
Photon flux (15-150 keV) in 64.00 sec: 3.849134E-02 ( -0.0123199 0.0126217 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03661e-07 ( -4.06884e-08 5.00397e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49297 ( )
Epeak [keV] : 17.9280 ( -3.66787 4.56721 )
Norm@50keV : 4.27144 ( -7.81270 29.9170 )
------------------------------------------------------------
Chi-Squared = 48.54301 using 59 PHA bins.
Reduced chi-squared = 0.8668395 for 56 degrees of freedom
Null hypothesis probability = 0.750
Photon flux (15-150 keV) in 64.00 sec: 3.861362E-02 ( -0.0112603 0.0113925 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.52781e-08 ( -2.70073e-08 2.92749e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.65785 ( -1.09347 13.9065 )
beta : -9.33696 ( -0.969666 0.701559 )
Epeak [keV] : 10.7264 ( -10.6264 9989.27 )
Norm@50keV : 9.083293E-04 ( -1.724419E-02 1.473624E-02) )
------------------------------------------------------------
Chi-Squared = 52.61003 using 59 PHA bins.
Reduced chi-squared = 0.9565461 for 55 degrees of freedom
Null hypothesis probability = 0.566
Photon flux (15-150 keV) in 64.00 sec: 3.954282E-02 ( -0.0118547 0.0115717 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.04858e-08 ( -3.17007e-08 2.99206e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.12316 ( -0.690910 0.982254 )
Norm@50keV : 1.282184E-04 ( -1.282184E-04 1.068198E-04) )
------------------------------------------------------------
Chi-Squared = 52.13254 using 59 PHA bins.
Reduced chi-squared = 0.9146060 for 57 degrees of freedom
Null hypothesis probability = 0.658
Photon flux (15-150 keV) in 64.00 sec: 3.849134E-02 ( -0.0123199 0.0126217 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03661e-07 ( -4.06884e-08 5.00397e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49297 ( )
Epeak [keV] : 17.9280 ( -3.66787 4.56721 )
Norm@50keV : 4.27144 ( -7.81270 29.9170 )
------------------------------------------------------------
Chi-Squared = 48.54301 using 59 PHA bins.
Reduced chi-squared = 0.8668395 for 56 degrees of freedom
Null hypothesis probability = 0.750
Photon flux (15-150 keV) in 64.00 sec: 3.861362E-02 ( -0.0112603 0.0113925 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.52781e-08 ( -2.70073e-08 2.92749e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.65785 ( -1.09347 13.9065 )
beta : -9.33696 ( -0.969666 0.701559 )
Epeak [keV] : 10.7264 ( -10.6264 9989.27 )
Norm@50keV : 9.083293E-04 ( -1.724419E-02 1.473624E-02) )
------------------------------------------------------------
Chi-Squared = 52.61003 using 59 PHA bins.
Reduced chi-squared = 0.9565461 for 55 degrees of freedom
Null hypothesis probability = 0.566
Photon flux (15-150 keV) in 64.00 sec: 3.954282E-02 ( -0.0118547 0.0115717 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.04858e-08 ( -3.17007e-08 2.99206e-08 ) ergs/cm2
Plot creation:
Thu Apr 9 00:29:31 EDT 2009