//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 11562 SUBJECT: GRB 110112B: A short GRB detected by INTEGRAL DATE: 11/01/13 10:34:53 GMT FROM: Sandro Mereghetti at IASF/CNR 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 11567 SUBJECT: GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst DATE: 11/01/14 14:13:35 GMT FROM: Owen Littlejohns at U of Leicester 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 11569 SUBJECT: GRB 110112B: Fermi GBM observation DATE: 11/01/14 20:44:30 GMT FROM: Valerie Connaughton at UAH/NSSTC 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 ± 0.20 and the cutoff energy, parametrized as Epeak, is 495 ± 196 keV. The event fluence (10-1000 keV) in this time interval is (3.53 ± 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 ± 1.0 ph/s/cm2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 11571 SUBJECT: Short GRB 110112B : early optical limit by "Pi of the Sky" DATE: 11/01/15 15:00:23 GMT FROM: Marcin Sokolowski at Soltan Inst. Nuc Studies,Warsaw 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 11621 SUBJECT: GRB110112B: EVLA Observations DATE: 11/02/01 04:39:50 GMT FROM: Ashley Zauderer at CfA 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.