Gamma-ray Burst 111103A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 03 Nov 11 10:42:37 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     506902,   Seg_Num: 0
GRB_RA:          327.122d {+21h 48m 29s} (J2000),
                 327.280d {+21h 49m 07s} (current),
                 326.453d {+21h 45m 49s} (1950)
GRB_DEC:         -10.547d {-10d 32' 49"} (J2000),
                 -10.492d {-10d 29' 29"} (current),
                 -10.780d {-10d 46' 47"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       5537 [cnts]    Image_Peak=310 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   147     E_range: 25-100 keV
BKG_INTEN:       28824 [cnts]
BKG_TIME:        38096.46 SOD {10:34:56.46} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15868 TJD;   307 DOY;   11/11/03
GRB_TIME:        38113.48 SOD {10:35:13.48} UT
GRB_PHI:         101.50 [deg]
GRB_THETA:        31.56 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     37.57 [sigma]
IMAGE_SIGNIF:    12.23 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +2  -5  +0 +26  +0 
SUN_POSTN:       218.24d {+14h 32m 57s}  -15.02d {-15d 01' 09"}
SUN_DIST:        105.23 [deg]   Sun_angle= -7.3 [hr] (East of Sun)
MOON_POSTN:      320.44d {+21h 21m 45s}  -10.49d {-10d 29' 32"}
MOON_DIST:         6.73 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       44.96,-43.96 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      325.74,  2.54 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;  
COMMENTS:        probably due to it occurring during a Malindi downlink session.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 16.08,-16.02 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 03 Nov 11 10:43:07 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     506902,   Seg_Num: 0
GRB_RA:          327.122d {+21h 48m 29s} (J2000),
                 327.280d {+21h 49m 07s} (current),
                 326.453d {+21h 45m 49s} (1950)
GRB_DEC:         -10.547d {-10d 32' 49"} (J2000),
                 -10.492d {-10d 29' 29"} (current),
                 -10.780d {-10d 46' 47"} (1950)
GRB_DATE:        15868 TJD;   307 DOY;   11/11/03
GRB_TIME:        38113.48 SOD {10:35:13.48} UT
TRIGGER_INDEX:   147
GRB_PHI:         101.50 [deg]
GRB_THETA:        31.56 [deg]
DELTA_TIME:      57.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     37.57 [sigma]
IMAGE_SIGNIF:    12.23 [sigma]
LC_URL:          sw00506902000msb.lc
SUN_POSTN:       218.24d {+14h 32m 57s}  -15.02d {-15d 01' 10"}
SUN_DIST:        105.23 [deg]   Sun_angle= -7.3 [hr] (East of Sun)
MOON_POSTN:      320.44d {+21h 21m 46s}  -10.49d {-10d 29' 27"}
MOON_DIST:         6.73 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       44.96,-43.96 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      325.74,  2.54 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 16.08,-16.02 [deg].

GCN Circular #12518
M. C. Stroh (PSU), W. H. Baumgartner (GSFC/UMBC), S. Campana (INAF-OAB), P. A. Evans (U Leicester), E. A. Hoversten (PSU), V. Mangano (INAF-IASFPA), A. Melandri (INAF-OAB), P. T. O'Brien (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), B. Sbarufatti (INAF-OAB/IASFPA) and M. Stamatikos (OSU/NASA/GSFC) report on behalf of the Swift Team:
At 10:35:13 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 111103A (trigger=506902). The BAT on-board calculated location is RA, Dec 327.122, -10.547 which is
```
   RA(J2000) = 21h 48m 29s
   Dec(J2000) = -10d 32' 49"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multiple-peaked structure with a duration of about 20 sec. The peak count rate was ~4800 counts/sec (15-350 keV), at ~0 sec after the trigger.
Due to a Moon observing constraint, Swift cannot slew to the BAT position until 20:12 UT on 2011 November 05. There will thus be no XRT or UVOT data for this trigger before this time.
Burst Advocate for this burst is M. C. Stroh (stroh AT astroh.org). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #12523
T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), M. Stamatikos (OSU), M. C. Stroh (PSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+358 sec from recent telemetry downlinks, we report further analysis of BAT GRB 111103A (trigger #506902) (Stroh, et al., GCN Circ. 12518). The BAT ground-calculated position is RA, Dec = 327.111, -10.532 deg, which is
```
   RA(J2000)  =  21h 48m 26.7s 
   Dec(J2000) = -10d 31' 54.3" 
```
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 31%.
The mask-weighted light curve shows 4 almost overlapping peaks with the first starting at ~T-0.5 sec, peaks at T+1, +4, +6, and +12 sec, and the last peak ending at ~T+20 sec. T90 (15-350 keV) is 11.6 +- 0.5 sec (estimated error including systematics).
The time-averaged spectrum from T-0.42 to T+12.14 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.30 +- 0.10. The fluence in the 15-150 keV band is 1.4 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+6.04 sec in the 15-150 keV band is 3.1 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/506902/BA/
GCN Circular #12529
D. Tierney (UCD) reports on behalf of the Fermi GBM Team:
At 10:35:13.39 UT on 03 November 2011, the Fermi Gamma-Ray Burst Monitor triggered and observed GRB 111103A (trigger 342009315/111103441), which was detected by the Swift/BAT (Stroh et al. 2011, GCN 12518). The GBM on-ground location is consistent with the Swift position.
The GBM light curve consists of multiple peaks with a duration (T90) of 11.78 +/- 1.18 s (50-300 keV). The time-averaged spectrum from T0 s to T0+13.7 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.43 (+0.16/-0.15) and the cutoff energy, parameterized as Epeak, is 152.2 (+16.1/-12.8) keV.
The event fluence (10-1000 keV) in this time interval is (3.20 +/- 0.19)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.13 s in the 10-1000 keV band is 5.2 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog.
GCN Circular #12706
A.Volnova (SAI MSU), M. Andreev, A. Sergeev (Terskol Branch of INASAN), V. Petkov (Baksan Neutrino Observatory of INR), N. Karpov, O. Andrienko, K. Martynyuk-Lototsky, N. Parakhin, N. Borachok, V. Kozlov, G. Butenko, V. Godunova (IC AMER, NASU), A. Pozanenko (IKI) report:
We observed field of the Swift GRB 111103A (Stroh et al. GCN 12518) with Zeiss-600 telescope of Mt.Terskol observatory in R filter between Nov. 3 (UT) 16:16:02 - 16:49:00. We took 60 frames with exposure of 30 seconds under favourable weather conditions and seeing (FWHM) of about 1.5''. We do not detect any source on a stacked frame within BAT ground-calculated error circle (Sakamoto et al., GCN 12523). A photometry is based on the USNO B1.0 nearby stars.
```
  T0+      Filter,   Exposure, OT,  UpperLimit
 (mid, d)               (s)

 0.24836  R         60x30       n/d   16.6
```

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Jochen Greiner, last update: 20-Dec-2011 [Disclaimer]