//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 10738 SUBJECT: GRB 100511A, RIMOTS optical upper limits DATE: 10/05/11 19:11:25 GMT FROM: Arata Daikyuji at Miyazaki U A.Daikyuji, N.Ohmori, Y.Nisioka, K.Noda, M.Yamauchi (University of Miyazaki) We have observed the field covering the error circle of GRB GRB100511A (Swift trigger 421695) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 14:19:42 UT, about two and a half hours after the Swift trigger time. We have compared our data of 30 sec exposures with the USNO-A2.0 catalog, There is no new source at the reported position. the upper limits are as follows: -------------------------------------------------------------- Start(UT) End(UT) Num. of frames Limit (mag.) -------------------------------------------------------------- 14:19:42 14:20:12 1 14.9 14:19:42 15:02:15 26 16.0 --------------------------------------------------------------- //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 10743 SUBJECT: GRB 100511A: Super-LOTIS early observations DATE: 10/05/11 22:18:43 GMT FROM: Adria C. Updike at Clemson U Adria C. Updike, Dieter H. Hartmann (Clemson University), G. Grant Williams (MMTO), and Peter A. Milne (Steward Observatory) report: We observed the field of Swift trigger 421695 (Sbarufatti et al., GCN 10737) with the 0.6m Super-LOTIS telescope located at KPNO beginning 21 seconds after the trigger. Within the BAT error circle, we detect no new sources to a limiting magnitude of R = 17.5 (as compared to the USNO B1.0 catalog) in our first 3 minutes of stacked exposures. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 10744 SUBJECT: GRB 100511A: Fermi GBM detection/observation DATE: 10/05/12 16:51:05 GMT FROM: Narayana Bhat at U Alabama/Huntsville/GBM P. N. Bhat (UAH) report on behalf of the Fermi GBM Team: "At 00:49:56.23 UT on 11 May 2010, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 100511A (trigger 295231798 / 100511035). The Fermi Observatory executed a maneuver following this trigger and tracked the burst location for the next 5 hours, subject to Earth-angle constraints. The on-ground calculated location, using the GBM trigger data, is RA = 109.29, DEC = -4.65 (J2000 degrees, equivalent to 07 h 17.2 m, -4 d 39 '), with an uncertainty of 1.0 degree (radius, 1-sigma containment, statistical only; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees). The angle from the Fermi LAT boresight is 43 degrees. The GBM light curve shows several pulses with a duration (T90) of about 38 s (50-300 keV). The time-averaged spectrum from T0-7.4 s to T0+52 s is adequately fit by a power law function with an exponential high energy cutoff. The power law index is -1.32 +/- 0.02 and the cutoff energy, parameterized as Epeak, is 946.6 (+134/-110) keV (C-stat 1777 for 863 d.o.f.). The event fluence (8-1000 keV) in this time interval is (7.08 +/- 0.05)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+25 s in the 8-1000 keV band is 8.81 +/- 0.18 ph/s/cm^2. A Band function fits the spectrum equally well (C-stat 1776 for 862 d.o.f.) with Epeak= 882.5 +166/-115 keV, alpha = -1.3 +/- 0.02 and beta = -2.43 (+0.24/-1.71). The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."