Gamma-ray Burst 110112B

(All information courtesy of the instrument teams.)

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 12 Jan 11 22:25:11 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     316563897
GRB_RA:           21.617d {+01h 26m 28s} (J2000),
                  21.780d {+01h 27m 07s} (current),
                  20.877d {+01h 23m 31s} (1950)
GRB_DEC:         +44.517d {+44d 30' 60"} (J2000),
                 +44.574d {+44d 34' 25"} (current),
                 +44.257d {+44d 15' 26"} (1950)
GRB_ERROR:       9.73 [deg radius, statistical plus systematic]
GRB_INTEN:       365 [cnts/sec]
DATA_SIGNIF:     7.20 [sigma]
INTEG_TIME:      0.256 [sec]
GRB_DATE:        15573 TJD;    12 DOY;   11/01/12
GRB_TIME:        80695.28 SOD {22:24:55.28} UT
GRB_PHI:         107.00 [deg]
GRB_THETA:        70.00 [deg]
DATA_TIME_SCALE: 0.2560 [sec]
HARD_RATIO:      0.00
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:     100%  Below horizon
2nd_MOST_LIKELY:   0%  n/a
DETECTORS:       0,1,0, 0,0,0, 0,0,0, 1,1,0, 0,0,
SUN_POSTN:       294.15d {+19h 36m 37s}  -21.58d {-21d 34' 53"}
SUN_DIST:        103.34 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:       23.62d {+01h 34m 30s}  +14.99d {+14d 59' 40"}
MOON_DIST:        29.62 [deg]
MOON_ILLUM:      54 [%]
GAL_COORDS:      129.48,-17.91 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       38.11, 32.60 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 137.60,11.37 [deg].

GCN Circular #11562
S.Mereghetti (IASF-Milano), D.Gotz (CEA-Saclay), J. Borkowski (CAMK, Torun), E. Bozzo, C.Ferrigno, M. Beck (ISDC, Versoix), on behalf of the IBAS Localization Team report:
A short gamma ray burst lasting about 0.5 s has been detected by IBAS in the IBIS/ISGRI data at 22:24:54.6 UT of January 12.
The detection significance was slightly below the threshold for automatic alert delivery.
Its refined coordinates (J2000) are:
```
 
  RA:  10.599  [degrees] 
  DEC: 64.406  [degrees] 
```
with an uncertainty of 2.6 arcmin (90% c.l.).
A preliminary analysis gives a 20-200 keV fluence of about 1e-7 erg/cm2 and a peak flux of about 5 ph/cm2 s (0.1 s integration time)
A plot of the light curve will be posted at
http://ibas.iasf-milano.inaf.it/IBAS_Results.html
NOTE: Automatic distribution of sky coordinates of low significance INTEGRAL IBAS triggers is currently under testing. This service will soon be made available to the interested users.

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Thu 13 Jan 11 11:05:30 UT
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    6127,   Sub_Num: 0
GRB_RA:          10.5990d {+00h 42m 24s} (J2000),
                 10.7641d {+00h 43m 03s} (current),
                  9.8559d {+00h 39m 25s} (1950)
GRB_DEC:        +64.4059d {+64d 24' 21"} (J2000),
                +64.4663d {+64d 27' 59"} (current),
                +64.1320d {+64d 07' 55"} (1950)
GRB_ERROR:      2.60 [arcmin, radius, statistical only]
GRB_INTEN:      7.36 [sigma]
GRB_TIME:       80694.60 SOD {22:24:54.60} UT
GRB_DATE:       15573 TJD;    12 DOY;   11/01/12
SC_RA:          349.69 [deg] (J2000)
SC_DEC:          66.92 [deg] (J2000)
SUN_POSTN:      294.72d {+19h 38m 54s}  -21.49d {-21d 29' 34"}
SUN_DIST:       103.52 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      29.94d {+01h 59m 45s}  +17.01d {+17d 00' 36"}
MOON_DIST:       49.21 [deg]
GAL_COORDS:     121.96,  1.55 [deg] galactic lon,lat of the burst
ECL_COORDS:      45.47, 52.74 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:           
COMMENTS:        NOTE: This INTEGRAL event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=316563897).  
COMMENTS:       generated manually see GCN 11562

red DSS finding chart ps-file
GCN Circular #11567
O.M. Littlejohns (U. Leicester), M. De Pasquale (MSSL-UCL), and D.C. Morris (GWU/GSFC) report, on behalf of the Swift team:
Swift XRT and UVOT instruments began observing the field of INTEGRAL burst GRB 110112B (Mereghetti et al., GCN circ 11562) 55.8 ks after the burst trigger. No candidate afterglow is detected in the INTEGRAL error circle.
UVOT and XRT observed the field of view from 55.8 ks until 67.3 ks after the trigger. UVOT observed in white filter, with a total exposure time of 3.6 ks. The three sigma upper limit for any new source in the field of view is 22.2 mag. XRT observations have a total exposure time of 4.9 ks, and yield a three sigma upper limit of 2.0e-3 counts/second for any new source in the field of view.
This circular is an official product of the Swift Team.
GCN Circular #11569
Valerie Connaughton (UAH) reports on behalf of the Fermi GBM Team:
"At 22:24:55.28 UT on 12 January 2011, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 110112B (trigger 316563897 / 110112934), which was also detected by INTEGRAL IBAS in the IBIS/ISGRI data (Mereghetti 2011, GCN 11562).
The angle from the Fermi LAT boresight is 50 degrees.
The GBM light curve consists of a single forked peak lasting about 0.256 s.
The time-averaged spectrum from T0-0.064 s to T0+0.192 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.72 =B1 0.20 and the cutoff energy, parametrized as Epeak, is 495 =B1 196 keV.
The event fluence (10-1000 keV) in this time interval is (3.53 =B1 0.49)E-07 erg/cm2. The 64 ms peak photon flux measured starting from T0-0.064 s in the 10-1000 keV band is 8.7 =B1 1.0 ph/s/cm2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #11571
M.Sokolowski,T.Batsch,A.Majcher,A.Majczyna,K.Nawrocki,J.Uzycki,G.Wrochna (SINS, Swierk), M.Cwiok,W.Dominik,L.W.Piotrowski,A.F.Zarnecki (University of Warsaw), K.Malek,L.Mankiewicz,R.Opiela,M.Siudek,V.Repei (CFT PAN), G.Kasprowicz,M.Zaremba (Warsaw University of Technology), from the "Pi of the Sky" collaboration ( http://grb.fuw.edu.pl ). M. Jelinek and A. J.Castro-Tirado (IAA-CSIC Granada) on behalf of a larger collaboration.
The wide field "Pi of the Sky North" apparatus installed in the BOOTES-1 station at ESAt/INTA-CEDEA in Mazagon (Huelva, Spain; http://grb.fuw.edu.pl/pi/index.html#piinta_site.htm ) observed position of short GRB 110112B since 2 hours 24 minutes before until 36 minutes after the burst. No new source brighter than 11 mag has been identified on 10s exposures. Images of special interest were collected at following time ranges :
```
      22:24:40.3 - 22:24:50.3  UT : mag > 11.0
      22:24:52.9 - 22:25:02.9  UT : mag > 11.0
      22:25:05.5 - 22:25:15.5  UT : mag > 11.0
```
where limits are based on the reference star magnitudo in V filter.
GCN Circular #11621
A. Zauderer, E. Berger, and W. Fong (Harvard) report:
We observed the position of the INTEGRAL short GRB 110112B (GCN #11562) with the EVLA at 5 GHz on four separate occasions: Jan 13.78, 14.73, 15.85, and 25.04 UT. The first three epochs lasted 1 hour, while the last epoch lasted 2 hours. In the initial observation we detected four sources within the 2.6' error circle reported for the burst location. Although variations in flux are present between epochs, none of the sources exhibit a significant decline over the 12-day baseline. Hence, we report no clear indication of association between the detected sources and the GRB.
We are grateful to the EVLA staff for their support of our initial and followup observations.

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Jochen Greiner, last update: 01-Feb-2011 [Disclaimer]