Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.48
Process Start Time: Mon Oct 24 11:47:33 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1110821
======================================================================
Trigger: 01110821 Segment: 000
BAT Trigger Time: 677236259.264 [s; MET]
Trigger Stop: 677236261.312 [s; MET]
UTC: 2022-06-18T09:10:29.923380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 38.9662491492886 Dec: 55.2135808003858 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.03
Image Trigger?: NO
Rate S/N Ratio: 7.14142842854285 [ if not an image trigger ]
Image S/N Ratio: 9.03
Analysis Position: [ source = BAT ]
RA: 38.9662491492886 Dec: 55.2135808003858 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 38.9953816386933 Dec: 55.2191173087397 [deg; J2000]
{ 02h 35m 58.9s , +55d 13' 08.8" }
+/- 2.05706039343107 [arcmin] (estimated 90% radius based on SNR)
+/- 0.752076884886051 [arcmin] (formal 1-sigma fit error)
SNR: 10.8548194751621
Angular difference between the analysis and refined position is 1.051045 arcmin
Partial Coding Fraction: 0.1933594 [ including projection effects ]
Duration
T90: 106.368000030518 +/- 50.8710841159097
Measured from: -9.20000004768372
to: 97.1679999828339 [s; relative to TRIGTIME]
T50: 22.2719999551773 +/- 11.3319880626803
Measured from: -0.832000017166138
to: 21.4399999380112 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.163999915122986
to: 1.16399991512299 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.4400000572205
to: 136.975999951363 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.959361 1.853715 1.494157 -0.011466
0.146305 0.153331 0.134352 0.114120 [error]
Peak 0.031826 0.088513 0.099325 0.026808
0.018338 0.020820 0.018372 0.014999 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 148.416 -11.440 136.976
T90 106.368 -9.200 97.168
T50 22.272 -0.832 21.440
Peak 1.000 0.164 1.164
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_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 both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: N/A)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.589 -0.156 0.154 - - - 2.20e-03 -2.16e-04 2.16e-04 59.900 57
CPL -0.259 -0.716 0.850 65.824 -10.208 21.740 1.02e-02 -5.64e-03 1.63e-02 48.550 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -2.937 -0.452 0.391 - - - 4.30e-03 -1.71e-03 1.68e-03 88.690 57
CPL 5.790 -3.404 -5.790 54.005 -7.996 9.059 3.93e+01 -3.93e+01 1.25e+03 64.620 56
=== 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 PL 4.53e-07 7.88e-07 1.05e-06 2.84e-06 3.05e-06 5.13e-06 erg/cm2
90%_error_low -6.92e-08 -7.93e-08 -1.29e-07 -6.61e-07 -3.17e-07 -7.86e-07 erg/cm2
90%_error_hi 7.21e-08 7.89e-08 1.29e-07 7.76e-07 3.19e-07 8.71e-07 erg/cm2
Peak flux PL 7.17e-01 3.14e-01 8.20e-02 2.64e-02 1.13e+00 1.14e+00 ph/cm2/s
90%_error_low -3.27e-01 -1.20e-01 -3.62e-02 -1.56e-02 -4.64e-01 -4.66e-01 ph/cm2/s
90%_error_hi 3.39e-01 1.20e-01 3.52e-02 1.83e-02 4.67e-01 4.68e-01 ph/cm2/s
Fluence CPL 3.59e-07 8.95e-07 1.14e-06 6.83e-07 2.85e-06 3.08e-06 erg/cm2
90%_error_low -8.22e-08 -1.00e-07 -1.54e-07 -3.40e-07 -3.30e-07 -4.67e-07 erg/cm2
90%_error_hi 8.55e-08 1.04e-07 1.55e-07 6.72e-07 3.36e-07 7.06e-07 erg/cm2
Peak flux CPL 1.10e-01 7.48e-01 5.44e-01 1.30e-02 1.41e+00 1.42e+00 ph/cm2/s
90%_error_low -1.10e-01 -3.67e-01 -2.03e-01 -8.22e-03 -4.53e-01 -4.55e-01 ph/cm2/s
90%_error_hi 3.07e-01 3.11e-01 2.42e-01 9.43e-03 4.94e-01 4.93e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 38.9954 55.2191 0.0178 46.9568 -41.1652 3.2013722 10.855 TRIG_01110821 Foreground time interval of the image: -11.440 23.237 (delta_t = 34.677 [sec]) Background time interval of the image: -62.763 -11.440 (delta_t = 51.323 [sec])
Light Curves
Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
Full-time range; 1 s binning
Other quick-look light curves:
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -11.440 sec. to 136.976 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.58917 ( -0.155793 0.153745 ) Norm@50keV : 2.19642E-03 ( -0.000216384 0.000215638 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 59.90 using 59 bins. Reduced chi-squared = 1.05088 # Null hypothesis probability of 3.71e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 148.4 sec: 0.281318 ( -0.027924 0.027992 ) ph/cm2/s Energy fluence (15-150 keV) : 3.05284e-06 ( -3.17296e-07 3.19131e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.440 sec. to 136.976 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.258573 ( -0.716323 0.849729 ) Epeak [keV] : 65.8238 ( -10.2078 21.7398 ) Norm@50keV : 1.01878E-02 ( -0.00563827 0.0162795 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 48.55 using 59 bins. Reduced chi-squared = 0.866964 # Null hypothesis probability of 7.50e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 148.4 sec: 0.267571 ( -0.028754 0.028859 ) ph/cm2/s Energy fluence (15-150 keV) : 2.84823e-06 ( -3.30004e-07 3.36147e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.164 sec. to 1.164 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.93654 ( -0.452846 0.390674 ) Norm@50keV : 4.29545E-03 ( -0.00171262 0.00168007 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 88.69 using 59 bins. Reduced chi-squared = 1.55596 # Null hypothesis probability of 4.56e-03 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.12840 ( -0.464459 0.46694 ) ph/cm2/s Energy fluence (15-150 keV) : 5.01718e-08 ( -1.92026e-08 1.91963e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.164 sec. to 1.164 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 5.7896 ( -3.42894 -5.81476 ) Epeak [keV] : 54.0048 ( -8.06338 8.99196 ) Norm@50keV : 39.3406 ( -40.7605 1244.45 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 64.62 using 59 bins. Reduced chi-squared = 1.15393 # Null hypothesis probability of 2.01e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.41439 ( -0.453142 0.49429 ) ph/cm2/s Energy fluence (15-150 keV) : 1.07651e-07 ( -2.71391e-08 2.70963e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
IMX = 8.060750188929401E-01, IMY = 7.048003004474200E-01
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -62.763400 -11.440000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 190.1226 31.4297 2.4 43.0 143.8 1.5817 4.9 ------ UNKNOWN 167.4409 15.4530 2.8 56.4 173.5 2.3103 4.1 ------ UNKNOWN 120.6038 29.0763 2.4 48.2 -129.3 2.3425 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -11.440000 23.236590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 242.0685 51.0539 1.9 39.4 77.0 2.2687 6.0 ------ UNKNOWN 38.9954 55.2191 1.1 47.0 -41.2 3.2011 10.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 130.636590 648.936600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 356.5595 17.2693 3.3 49.7 35.5 6.1608 3.5 ------ UNKNOWN 32.0556 8.1828 2.5 47.3 -12.8 5.0651 4.6 ------ UNKNOWN 127.9007 49.7459 2.8 50.7 -145.5 8.4614 4.2 ------ UNKNOWN 81.6598 27.8292 1.9 41.0 -88.1 18.4145 6.1 ------ UNKNOWN