batgrbproduct Analysis for Trigger=416076
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): Tue Mar 16 18:08:17 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger416076/GCN5_download_cron
======================================================================
Trigger: 00416076 Segment: 000
BAT Trigger Time: 290398986.048 [s; MET]
Trigger Stop: 290398988.096 [s; MET]
UTC: 2010-03-16T02:23:00.430180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 252.031620948293 Dec: 71.8254875350265 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.09
Image Trigger?: NO
Rate S/N Ratio: 13.7113092008021 [ if not an image trigger ]
Image S/N Ratio: 8.09
Flight Position: [ source = BAT ]
RA: 252.031620948293 Dec: 71.8254875350265 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 251.954543958062 Dec: 71.8182796681961 [deg; J2000]
{ 16h 47m 49.1s , +71d 49' 05.8" }
+/- 1.66469024191255 [arcmin] (estimated 90% radius based on SNR)
+/- 0.740812421076995 [arcmin] (formal 1-sigma fit error)
SNR: 14.6868195956605
Angular difference between Flight and Ground position is 1.506176 arcmin
Partial Coding Fraction: 0.1621094 [ including projection effects ]
Duration
T90: 6.73600006103516 +/- 0.951865531564711
Measured from: -0.69599986076355
to: 6.04000020027161 [s; relative to TRIGTIME]
T50: 3.45600003004074 +/- 0.845430073540578
Measured from: 0.600000143051147
to: 4.05600017309189 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.9640000462532
to: 2.9640000462532 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.20800000429153
to: 6.7600000500679 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.294537 0.402547 0.404888 0.081083
0.041450 0.044313 0.038541 0.031574 [error]
Peak 0.069018 0.089238 0.082347 0.006225
0.015456 0.015658 0.014746 0.011330 [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 1.05e-07 1.99e-07 2.91e-07 9.07e-07 8.24e-07 1.50e-06 erg/cm2
Error 2.02e-08 2.32e-08 3.75e-08 2.55e-07 9.29e-08 2.80e-07 erg/cm2
Peak flux Power-law 6.82e-01 7.35e-01 5.63e-01 7.05e-01 2.25e+00 2.68e+00 ph/cm2/s
Error 2.20e-01 1.47e-01 1.14e-01 2.96e-01 4.11e-01 4.71e-01 ph/cm2/s
Fluence Cutoff-PL 9.69e-08 2.05e-07 3.03e-07 5.65e-07 8.11e-07 1.17e-06 erg/cm2
Error 1.91e-08 2.65e-08 4.43e-08 4.38e-07 9.67e-08 4.49e-07 erg/cm2
Peak flux Cutoff-PL 6.28e-01 7.56e-01 5.88e-01 4.93e-01 2.21e+00 2.46e+00 ph/cm2/s
Error 2.65e-01 1.64e-01 1.36e-01 5.05e-01 4.22e-01 6.17e-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 2.59e+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 1.454 0.182 - - 1.08e-02 1.14e-03 51.580 57
CPL 1.073 0.649 134.2 0.0 1.63e-02 0.00e+00 50.770 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.384 0.297 - - 1.85e-02 3.22e-03 54.440 57
CPL 1.017 1.432 146.7 0.0 2.76e-02 5.88e-02 54.130 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: 6.592000 sec.
T50 in the 50-300 keV band: 3.712000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 7.968 -1.208 6.760
T90 6.736 -0.696 6.040
T50 3.456 0.600 4.056
Peak 1.000 1.964 2.964
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
251.9545 +71.8183 0.0130 44.0 144.1 1.2527 14.7 TRIG_00416076
------------------------------------------
Foreground time interval of the image:
-1.208 6.760 (delta_t = 7.968 [sec])
Background time interval of the image:
-239.048 -80.468 (delta_t = 158.580 [sec])
-79.048 -1.208 (delta_t = 77.840 [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 -1.208 sec. to 6.760 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45360 ( -0.181519 0.181965 )
Norm@50keV : 1.08150E-02 ( -0.00113944 0.00113786 )
------------------------------------------------------------
# Chi-Squared = 51.58 using 59 PHA bins.
# Reduced chi-squared = 0.9049 for 57 degrees of freedom
# Null hypothesis probability = 6.778838e-01
Photon flux (15-150 keV) in 7.968 sec: 1.33399 ( -0.148063 0.148599 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.24074e-07 ( -9.26758e-08 9.3067e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.208 sec. to 6.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07266 ( -0.825196 0.47331 )
Epeak [keV] : 134.196 ( )
Norm@50keV : 1.62770E-02 ( )
------------------------------------------------------------
# Chi-Squared = 50.77 using 59 PHA bins.
# Reduced chi-squared = 0.9065 for 56 degrees of freedom
# Null hypothesis probability = 6.726901e-01
Photon flux (15-150 keV) in 7.968 sec: 1.30979 ( -0.15546 0.15484 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.11477e-07 ( -9.68749e-08 9.65642e-08 ) ergs/cm2
Band function
Time interval is from -1.208 sec. to 6.760 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07318 ( -0.467631 0.849264 )
beta : -10.00000 ( 3.15472e+14 3.15472e+14 )
Epeak [keV] : 134.288 ( -58.1947 -134.271 )
Norm@50keV : 1.62662E-02 ( -0.00637779 0.0216237 )
------------------------------------------------------------
# Chi-Squared = 50.77 using 59 PHA bins.
# Reduced chi-squared = 0.9230 for 55 degrees of freedom
# Null hypothesis probability = 6.370313e-01
Photon flux (15-150 keV) in 7.968 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit
Power-law model
Time interval is from 1.964 sec. to 2.964 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38448 ( -0.298016 0.296412 )
Norm@50keV : 1.85067E-02 ( -0.00321694 0.00321418 )
------------------------------------------------------------
# Chi-Squared = 54.44 using 59 PHA bins.
# Reduced chi-squared = 0.9551 for 57 degrees of freedom
# Null hypothesis probability = 5.717829e-01
Photon flux (15-150 keV) in 1 sec: 2.24596 ( -0.409671 0.411741 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.794e-07 ( -3.33336e-08 3.35563e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.964 sec. to 2.964 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01749 ( -1.39682 1.46747 )
Epeak [keV] : 146.665 ( -146.664 -146.664 )
Norm@50keV : 2.75567E-02 ( -0.0275568 0.0900292 )
------------------------------------------------------------
# Chi-Squared = 54.13 using 59 PHA bins.
# Reduced chi-squared = 0.9667 for 56 degrees of freedom
# Null hypothesis probability = 5.458476e-01
Photon flux (15-150 keV) in 1 sec: 2.21343 ( -0.4223 0.42229 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.7551e-07 ( -3.4562e-08 3.2276e-08 ) ergs/cm2
Band function
Time interval is from 1.964 sec. to 2.964 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01742 ( 0.788955 0.788955 )
beta : -2.34989 ( 2.20656 12.2018 )
Epeak [keV] : 146.615 ( -146.549 -146.549 )
Norm@50keV : 2.75568E-02 ( -0.00990427 4824.31 )
------------------------------------------------------------
# Chi-Squared = 54.13 using 59 PHA bins.
# Reduced chi-squared = 0.9842 for 55 degrees of freedom
# Null hypothesis probability = 5.077342e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Tue Mar 16 19:14:40 EDT 2010