batgrbproduct Analysis for Trigger=370846
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): Mon Sep 28 01:01:31 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger370846/GCN5_download_cron
======================================================================
Trigger: 00370846 Segment: 000
BAT Trigger Time: 275738842.048 [s; MET]
Trigger Stop: 275738842.56 [s; MET]
UTC: 2009-09-27T10:07:16.926760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 343.953096034345 Dec: -70.9775664473784 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.42
Image Trigger?: NO
Rate S/N Ratio: 25.8263431402899 [ if not an image trigger ]
Image S/N Ratio: 11.42
Flight Position: [ source = BAT ]
RA: 343.953096034345 Dec: -70.9775664473784 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 343.928927079706 Dec: -70.9733856724057 [deg; J2000]
{ 22h 55m 42.9s , -70d 58' 24.2" }
+/- 1.58241334351698 [arcmin] (estimated 90% radius based on SNR)
+/- 0.720575129730668 [arcmin] (formal 1-sigma fit error)
SNR: 15.7897630827247
Angular difference between Flight and Ground position is 0.535140 arcmin
Partial Coding Fraction: 0.5546875 [ including projection effects ]
Duration
T90: 2.1599999666214 +/- 0.400898977948906
Measured from: 0.104000151157379
to: 2.26400011777878 [s; relative to TRIGTIME]
T50: 1.11199998855591 +/- 0.31529667414863
Measured from: 0.324000120162964
to: 1.43600010871887 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0079999566078186
to: 0.992000043392181 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0240000486373901
to: 2.43999999761581 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.102704 0.141373 0.080865 0.014560
0.012102 0.012570 0.011261 0.011033 [error]
Peak 0.063430 0.097058 0.052235 0.010766
0.007924 0.008591 0.007720 0.007194 [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 3.62e-08 5.56e-08 6.39e-08 1.41e-07 1.98e-07 2.97e-07 erg/cm2
Error 5.76e-09 5.93e-09 1.11e-08 4.95e-08 2.57e-08 6.06e-08 erg/cm2
Peak flux Power-law 7.63e-01 6.80e-01 4.16e-01 3.87e-01 2.02e+00 2.25e+00 ph/cm2/s
Error 1.26e-01 7.56e-02 6.86e-02 1.23e-01 2.24e-01 2.57e-01 ph/cm2/s
Fluence Cutoff-PL 3.45e-08 5.90e-08 6.36e-08 6.15e-08 1.88e-07 2.19e-07 erg/cm2
Error 6.43e-09 7.88e-09 1.22e-08 8.92e-08 2.91e-08 8.80e-08 erg/cm2
Peak flux Cutoff-PL 6.81e-01 7.63e-01 4.19e-01 1.17e-01 1.95e+00 1.98e+00 ph/cm2/s
Error 1.46e-01 1.05e-01 8.11e-02 1.35e-01 2.32e-01 2.63e-01 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 1.99e+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 1.798 0.198 - - 8.88e-03 1.12e-03 78.960 57
CPL 1.303 0.649 61.8 0.0 1.68e-02 0.00e+00 77.660 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.707 0.193 - - 1.52e-02 1.93e-03 73.700 57
CPL 0.682 0.977 56.0 36.4 5.71e-02 1.11e-01 69.300 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 2.416 0.024 2.440
T90 2.160 0.104 2.264
T50 1.112 0.324 1.436
Peak 1.000 -0.008 0.992
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
343.9289 -70.9734 0.0121 27.1 129.2 0.3611 15.8 TRIG_00370846
------------------------------------------
Foreground time interval of the image:
0.024 2.440 (delta_t = 2.416 [sec])
Background time interval of the image:
-239.048 0.024 (delta_t = 239.072 [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 0.024 sec. to 2.440 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79777 ( -0.193453 0.201828 )
Norm@50keV : 8.87985E-03 ( -0.00113657 0.00111124 )
------------------------------------------------------------
# Chi-Squared = 78.96 using 59 PHA bins.
# Reduced chi-squared = 1.385 for 57 degrees of freedom
# Null hypothesis probability = 2.867714e-02
Photon flux (15-150 keV) in 2.416 sec: 1.22257 ( -0.130939 0.130968 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.9752e-07 ( -2.54584e-08 2.6009e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.024 sec. to 2.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30285 ( -0.885009 0.412784 )
Epeak [keV] : 61.7528 ( )
Norm@50keV : 1.67945E-02 ( )
------------------------------------------------------------
# Chi-Squared = 77.66 using 59 PHA bins.
# Reduced chi-squared = 1.387 for 56 degrees of freedom
# Null hypothesis probability = 2.931938e-02
Photon flux (15-150 keV) in 2.416 sec: 1.19761 ( -0.13581 0.13271 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87714e-07 ( -2.86448e-08 2.95354e-08 ) ergs/cm2
Band function
Time interval is from 0.024 sec. to 2.440 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.169265 ( 1.43851 1.0636 )
beta : 10.00000 ( -1.97895e+15 -1.97895e+15 )
Epeak [keV] : 0.952182 ( )
Norm@50keV : 4.31740E-19 ( )
------------------------------------------------------------
# Chi-Squared = 146.75 using 59 PHA bins.
# Reduced chi-squared = 2.6682 for 55 degrees of freedom
# Null hypothesis probability = 2.759428e-10
Photon flux (15-150 keV) in 2.416 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 0.024 sec. to 0.960 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70681 ( -0.188939 0.196257 )
Norm@50keV : 1.51984E-02 ( -0.00194165 0.00190954 )
------------------------------------------------------------
# Chi-Squared = 73.70 using 59 PHA bins.
# Reduced chi-squared = 1.293 for 57 degrees of freedom
# Null hypothesis probability = 6.754190e-02
Photon flux (15-150 keV) in 0.936 sec: 2.02334 ( -0.224471 0.224506 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31644e-07 ( -1.7472e-08 1.78353e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.024 sec. to 0.960 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.682304 ( -1.10425 0.849635 )
Epeak [keV] : 55.9961 ( -12.0571 60.6867 )
Norm@50keV : 5.70888E-02 ( -0.0376308 0.183669 )
------------------------------------------------------------
# Chi-Squared = 69.30 using 59 PHA bins.
# Reduced chi-squared = 1.237 for 56 degrees of freedom
# Null hypothesis probability = 1.091843e-01
Photon flux (15-150 keV) in 0.936 sec: 1.95096 ( -0.23187 0.23201 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19161e-07 ( -1.90701e-08 2.027e-08 ) ergs/cm2
Band function
Time interval is from 0.024 sec. to 0.960 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.682314 ( -0.669727 0.757101 )
beta : -10.00000 ( 5.71143e+08 5.71143e+08 )
Epeak [keV] : 55.9832 ( -12.054 60.6646 )
Norm@50keV : 5.70907E-02 ( -0.0376365 0.183819 )
------------------------------------------------------------
# Chi-Squared = 69.30 using 59 PHA bins.
# Reduced chi-squared = 1.260 for 55 degrees of freedom
# Null hypothesis probability = 9.296160e-02
Photon flux (15-150 keV) in 0.936 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Mon Sep 28 01:23:34 EDT 2009