batgrbproduct Analysis for Trigger=357498
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): Thu Jul 16 09:06:22 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger357498/GCN5_download_cron
======================================================================
Trigger: 00357498 Segment: 000
BAT Trigger Time: 269371544.064 [s; MET]
Trigger Stop: 269371544.32 [s; MET]
UTC: 2009-07-15T17:25:39.150560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 152.121935465376 Dec: 9.99748569935098 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.85
Image Trigger?: NO
Rate S/N Ratio: 57.835974963685 [ if not an image trigger ]
Image S/N Ratio: 9.85
Flight Position: [ source = BAT ]
RA: 152.121935465376 Dec: 9.99748569935098 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 152.116983047292 Dec: 10.0057059329101 [deg; J2000]
{ 10h 08m 28.1s , +10d 00' 20.5" }
+/- 2.65153411212635 [arcmin] (estimated 90% radius based on SNR)
+/- 1.4372479230643 [arcmin] (formal 1-sigma fit error)
SNR: 7.55304988847868
Angular difference between Flight and Ground position is 0.573491 arcmin
Partial Coding Fraction: 0.2207031 [ including projection effects ]
Duration
T90: 64 +/- 22.6274169979695
Measured from: -15.0639998912811
to: 48.9360001087189 [s; relative to TRIGTIME]
T50: 48 +/- 16
Measured from: -15.0639998912811
to: 32.9360001087189 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -7.56400001049042
to: -6.56400001049042 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.0640000104904
to: 48.9359999895096 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.197485 0.436175 0.406757 0.170923
0.094010 0.098131 0.087660 0.078324 [error]
Peak 0.013376 0.119850 0.202508 0.090936
0.047584 0.049816 0.044683 0.039782 [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 7.20e-08 1.79e-07 3.54e-07 1.77e-06 9.58e-07 2.36e-06 erg/cm2
Error 3.94e-08 5.80e-08 7.89e-08 1.06e-06 2.18e-07 1.07e-06 erg/cm2
Peak flux Power-law 2.76e-02 5.39e-02 8.16e-02 2.69e-01 2.29e-01 4.32e-01 ph/cm2/s
Error 2.56e-02 3.10e-02 2.32e-02 1.69e-01 7.56e-02 1.47e-01 ph/cm2/s
Fluence Cutoff-PL 7.18e-08 1.79e-07 3.55e-07 1.74e-06 9.57e-07 2.34e-06 erg/cm2
Error 3.94e-08 5.81e-08 8.28e-08 1.05e-06 2.19e-07 1.06e-06 erg/cm2
Peak flux Cutoff-PL 2.75e-02 5.39e-02 8.17e-02 2.67e-01 2.29e-01 4.30e-01 ph/cm2/s
Error 2.55e-02 3.09e-02 2.32e-02 1.68e-01 7.56e-02 1.46e-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 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 1.011 0.453 - - 1.39e-03 3.44e-04 60.130 57
CPL 1.002 0.457 9997.9 0.0 1.39e-03 1.31e-03 60.140 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.401 0.643 - - 1.90e-03 7.99e-04 49.450 57
CPL 0.389 1.973 9999.3 0.0 1.92e-03 5.20e-03 49.450 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: 0.320000 sec.
T50 in the 50-300 keV band: 0.192000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 64.000 -15.064 48.936
T90 64.000 -15.064 48.936
T50 48.000 -15.064 32.936
Peak 1.000 -7.564 -6.564
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
152.1170 +10.0057 0.0255 47.2 -145.8 1.5071 7.6 TRIG_00357498
------------------------------------------
Foreground time interval of the image:
-15.064 48.936 (delta_t = 64.000 [sec])
Background time interval of the image:
-239.064 -15.064 (delta_t = 224.000 [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 -15.064 sec. to 48.936 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01080 ( -0.484525 0.421935 )
Norm@50keV : 1.38753E-03 ( -0.000354046 0.000333769 )
------------------------------------------------------------
# Chi-Squared = 60.13 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 57 degrees of freedom
# Null hypothesis probability = 3.631410e-01
Photon flux (15-150 keV) in 64 sec: 0.159351 ( -0.0400238 0.0416094 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.57702e-07 ( -2.19321e-07 2.17573e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.064 sec. to 48.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00224 ( -0.486184 0.427545 )
Epeak [keV] : 9997.86 ( -8958.21 -8958.21 )
Norm@50keV : 1.39460E-03 ( -0.000318259 0.00230112 )
------------------------------------------------------------
# Chi-Squared = 60.14 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 56 degrees of freedom
# Null hypothesis probability = 3.283034e-01
Photon flux (15-150 keV) in 64 sec: 0.159774 ( -0.040556 0.041216 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.56883e-07 ( -2.18579e-07 2.19034e-07 ) ergs/cm2
Band function
Time interval is from -15.064 sec. to 48.936 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.92279 ( -26.7237 -26.7237 )
beta : -1.06711 ( -0.524516 0.503248 )
Epeak [keV] : 29.1893 ( -29.142 16.6296 )
Norm@50keV : 33.9814 ( -34.5796 48.6916 )
------------------------------------------------------------
# Chi-Squared = 59.78 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 55 degrees of freedom
# Null hypothesis probability = 3.064178e-01
Photon flux (15-150 keV) in 64 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 -15.064 sec. to 0.936 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.401000 ( -0.741618 0.545322 )
Norm@50keV : 1.89984E-03 ( -0.000837588 0.000761335 )
------------------------------------------------------------
# Chi-Squared = 49.45 using 59 PHA bins.
# Reduced chi-squared = 0.8675 for 57 degrees of freedom
# Null hypothesis probability = 7.510828e-01
Photon flux (15-150 keV) in 16 sec: 0.229138 ( -0.0735247 0.0777189 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.29966e-07 ( -1.11122e-07 1.11125e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.064 sec. to 0.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.389381 ( -2.67324 1.2732 )
Epeak [keV] : 9999.34 ( )
Norm@50keV : 1.91715E-03 ( -0.00082558 0.00958399 )
------------------------------------------------------------
# Chi-Squared = 49.45 using 59 PHA bins.
# Reduced chi-squared = 0.8831 for 56 degrees of freedom
# Null hypothesis probability = 7.193364e-01
Photon flux (15-150 keV) in 16 sec: 0.229074 ( -0.073431 0.077676 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.30238e-07 ( -1.11192e-07 1.11195e-07 ) ergs/cm2
Band function
Time interval is from -15.064 sec. to 0.936 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.647223 ( 0.647215 0.647215 )
beta : -0.401006 ( -0.545832 0.740733 )
Epeak [keV] : 17.3710 ( -17.371 -17.371 )
Norm@50keV : 2.78515E-03 ( 52.6398 -0.00278515 )
------------------------------------------------------------
# Chi-Squared = 49.45 using 59 PHA bins.
# Reduced chi-squared = 0.8991 for 55 degrees of freedom
# Null hypothesis probability = 6.858195e-01
Photon flux (15-150 keV) in 16 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Thu Jul 16 09:22:15 EDT 2009