batgrbproduct Analysis for Trigger=374875
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 Nov 4 22:45:11 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger374875/GCN5_download_cron
======================================================================
Trigger: 00374875 Segment: 000
BAT Trigger Time: 279017368 [s; MET]
Trigger Stop: 279017432 [s; MET]
UTC: 2009-11-04T08:49:22.769680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 208.742361503349 Dec: 47.3985736611166 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.72
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.72
Flight Position: [ source = BAT ]
RA: 208.742361503349 Dec: 47.3985736611166 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 208.72348248235 Dec: 47.3905004754254 [deg; J2000]
{ 13h 54m 53.6s , +47d 23' 25.8" }
+/- 2.64901048576761 [arcmin] (estimated 90% radius based on SNR)
+/- 1.09326892293377 [arcmin] (formal 1-sigma fit error)
SNR: 7.563331337436
Angular difference between Flight and Ground position is 0.906986 arcmin
Partial Coding Fraction: 0.8203125 [ including projection effects ]
Duration
T90: 99.2879999876022 +/- 19.6572019768587
Measured from: 15.8160001039505
to: 115.104000091553 [s; relative to TRIGTIME]
T50: 58.1599999666214 +/- 14.9235965045096
Measured from: 27.3520001173019
to: 85.5120000839233 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 83.3360000252724
to: 84.3360000252724 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.48000001907349
to: 120.519999980927 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.439278 0.504545 0.315532 0.150848
0.057158 0.059646 0.054279 0.050693 [error]
Peak 0.008236 0.013819 0.022768 0.004984
0.005104 0.005487 0.004704 0.004515 [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 1.34e-07 2.13e-07 2.54e-07 5.92e-07 7.73e-07 1.19e-06 erg/cm2
Error 2.53e-08 2.72e-08 5.28e-08 2.49e-07 1.23e-07 3.02e-07 erg/cm2
Peak flux Power-law 8.30e-02 1.11e-01 1.09e-01 1.93e-01 3.67e-01 4.96e-01 ph/cm2/s
Error 5.31e-02 4.46e-02 3.74e-02 1.45e-01 1.21e-01 1.70e-01 ph/cm2/s
Fluence Cutoff-PL 1.26e-07 2.30e-07 2.51e-07 2.02e-07 7.19e-07 8.09e-07 erg/cm2
Error 2.91e-08 3.84e-08 5.98e-08 3.71e-07 1.41e-07 4.17e-07 erg/cm2
Peak flux Cutoff-PL 4.84e-02 1.16e-01 1.29e-01 4.82e-02 3.32e-01 3.48e-01 ph/cm2/s
Error 5.69e-02 5.68e-02 6.03e-02 1.27e-01 2.03e-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 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 1.743 0.236 - - 6.86e-04 1.04e-04 55.230 57
CPL 0.990 1.118 58.1 -22.2 1.81e-03 4.09e-03 54.020 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.023 0.561 - - 3.18e-03 1.03e-03 57.290 57
CPL -0.846 0.000 87.7 0.0 2.03e-02 4.57e-01 55.960 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 122.000 -1.480 120.520
T90 99.288 15.816 115.104
T50 58.160 27.352 85.512
Peak 1.000 83.336 84.336
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
208.7235 +47.3905 0.0254 21.7 -131.7 0.9117 7.6 TRIG_00374875
------------------------------------------
Foreground time interval of the image:
-1.480 73.101 (delta_t = 74.581 [sec])
Background time interval of the image:
-138.099 -1.480 (delta_t = 136.619 [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 -1.480 sec. to 120.520 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74320 ( -0.229596 0.241556 )
Norm@50keV : 6.86118E-04 ( -0.000105141 0.000102515 )
------------------------------------------------------------
# Chi-Squared = 55.23 using 59 PHA bins.
# Reduced chi-squared = 0.9689 for 57 degrees of freedom
# Null hypothesis probability = 5.417617e-01
Photon flux (15-150 keV) in 122 sec: 9.25380E-02 ( -0.0118143 0.0118151 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.72652e-07 ( -1.21057e-07 1.24507e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.480 sec. to 120.520 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.989566 ( -1.17225 1.06302 )
Epeak [keV] : 58.1282 ( -14.0221 -58.3272 )
Norm@50keV : 1.81149E-03 ( -0.00178247 0.00640084 )
------------------------------------------------------------
# Chi-Squared = 54.02 using 59 PHA bins.
# Reduced chi-squared = 0.9646 for 56 degrees of freedom
# Null hypothesis probability = 5.502470e-01
Photon flux (15-150 keV) in 122 sec: 9.00273E-02 ( -0.0124103 0.0123887 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.19283e-07 ( -1.36081e-07 1.46504e-07 ) ergs/cm2
Band function
Time interval is from -1.480 sec. to 120.520 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.09723 ( 1.09473 6.07568 )
beta : -2.33586 ( 2.3502 0.770487 )
Epeak [keV] : 60.0427 ( -59.5397 -59.5397 )
Norm@50keV : 1.58911E-03 ( -0.000789592 90.3667 )
------------------------------------------------------------
# Chi-Squared = 53.89 using 59 PHA bins.
# Reduced chi-squared = 0.9798 for 55 degrees of freedom
# Null hypothesis probability = 5.171737e-01
Photon flux (15-150 keV) in 122 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 83.336 sec. to 84.336 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02340 ( -0.589096 0.533484 )
Norm@50keV : 3.17905E-03 ( -0.00103768 0.00102549 )
------------------------------------------------------------
# Chi-Squared = 57.29 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 57 degrees of freedom
# Null hypothesis probability = 4.643887e-01
Photon flux (15-150 keV) in 1 sec: 0.366546 ( -0.120513 0.122116 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.41017e-08 ( -1.1498e-08 1.17295e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 83.336 sec. to 84.336 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.845975 ( 0.845984 0.845984 )
Epeak [keV] : 87.7107 ( -87.7106 -87.7106 )
Norm@50keV : 2.02867E-02 ( -0.0202869 0.89297 )
------------------------------------------------------------
# Chi-Squared = 55.96 using 59 PHA bins.
# Reduced chi-squared = 0.9993 for 56 degrees of freedom
# Null hypothesis probability = 4.763117e-01
Photon flux (15-150 keV) in 1 sec: 0.331602 ( -0.120969 0.132669 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.02415e-08 ( -1.15078e-08 1.2909e-08 ) ergs/cm2
Band function
Time interval is from 83.336 sec. to 84.336 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.848785 ( -1.51818 -0.386568 )
beta : -10.00000 ( 7.76267e+08 7.76267e+08 )
Epeak [keV] : 87.6369 ( -30.4477 -87.6369 )
Norm@50keV : 2.03529E-02 ( -0.0178956 0.72607 )
------------------------------------------------------------
# Chi-Squared = 55.96 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 55 degrees of freedom
# Null hypothesis probability = 4.385370e-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 Nov 4 23:16:17 EST 2009