//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 10560 SUBJECT: GRB 100331B: SuperAGILE Localization of a Long GRB DATE: 10/04/01 09:04:47 GMT FROM: Marco Feroci at IASF/INAF E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, F. Lazzarotto, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda (INAF/IASF Rome), A. Giuliani, A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milan), A. Pellizzoni, M. Pilia (INAF/OA Cagliari), S. Vercellone, F. D'Ammando (INAF/IASF Palermo), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli (INAF/IASF Bologna), M. Tavani, G. Pucella, V. Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini (INAF/IASF Rome), G. Barbiellini, F. Longo, E. Moretti (INFN Trieste), P. Picozza, A. Morselli, E. Striani, (INFN Roma-2), M. Prest, E. Vallazza (Universita' dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, F. Lucarelli, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report: "SuperAGILE detected a gamma ray burst on 31 March 2010, at 21:08:38 UT. The event had a duration of about 30 s in the 20-60 keV energy range, with a multi-peak structure. AGILE is currently operating in a spinning mode and the reported duration may be a lower limit to the GRB duration. The burst position was reconstructed as (RA, Dec) (302.987, -11.067) deg, which is: RA(J2000) = 20h 11m 56.95s Dec(J2000) = -11d 04' 02.04" with an uncertainty of 6' radius to account for possible systematics error due to the spinning mode. The GRB is not detected by the AGILE/MCAL (above 350 keV) nor AGILE/GRID (30 MeV - 30 GeV)." This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 10562 SUBJECT: GRB 100331B: Swift/XRT possible afterglow candidate DATE: 10/04/02 00:38:12 GMT FROM: Valerio D'Elia at ASDC V. D'Elia and G. Stratta (ASDC) report on behalf of the Swift Team: Swift began a target of opportunity observation of the SuperAGILE detected GRB 100331B (Del Monte et al., GCN #10560), at 14:38UT on April 1st, 2010, about 17.5 hours after the SuperAgile detection. We have analysed 2.1 ks of XRT data,  from 63152 s to 69.7 ks after the        BAT trigger. The data are entirely in Photon Counting (PC) mode. Using 1839 s of PC mode data and 2 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 303.02160, -11.10810 which is equivalent to: RA (J2000): 20 12 5.18 Dec(J2000): -11 06 29.0 with an uncertainty of 2.0 arcsec (radius, 90% confidence). This  position lies 3.2 arcmins from the SuperAGILE reported position. We  currently cannot confirm if this source is fading. This circular is an official product of the Swift/XRT team. ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 10563 SUBJECT: GRB 100331B: Swift/UVOT Upper Limits DATE: 10/04/02 02:12:21 GMT FROM: Michele Stark at PSU/Swift M. A. Stark (PSU), G. Stratta (ASDC), E. A. Hoversten (PSU), and M. H. Siegel (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of the SuperAGILE detected GRB 100331B about 17.5 hours after the SuperAGILE detection (Del Monte et al., GCN #10560). No optical afterglow consistent with the XRT enhanced position reported by D'Elia & Stratta (GCN #10562) is detected in the initial UVOT exposure. Observations were conducted using only the UVOT white filter, with a preliminary 3-sigma upper limit using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the initial exposure of: Filter T_start(s) T_stop(s) Exp(s) Mag --------------------------------------------------------------- white 63371 64517 650 >21.21 The value quoted above is not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.12 in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 10566 SUBJECT: GRB 100331B: BOOTES-3 observations DATE: 10/04/02 15:09:25 GMT FROM: Antonio Deugarte at IAA-CSIC A. de Ugarte Postigo (INAF-OAB), A.J. Castro-Tirado, J. Gorosabel, M. Jelinek (IAA-CSIC), P. Kubanek (IPL UV, IAA-CSIC), R. Cunniffe, S. Guziy (IAA-CSIC), P. Yock (Auckland Univ.), W.H. Allen (Vintage Lane Obs.), I. Bond (Massey Univ.), G. Christie (Stardome Obs.), report on behalf of a larger collaboration, report: We have observed the field of the AGILE GRB 100331B (Del Monte et al. GCN 10560) using the 0.6m Yock-Allen robotic telescope (BOOTES-3) located in Blenheim, New Zealand. A combined 36x60s unfiltered exposure with mean epoch 1st April 2010 at 16:30 UT (19.2 hours after the burst) obtained through cirrus does not show any source within the Swift/XRT error circle (D'Elia et al. GCN 10562) down to a 3-sigma limiting magnitude of R~18.5 using USNO-B1.0 as photometric reference. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 10572 SUBJECT: GRB 100331B: GROND Upper limits DATE: 10/04/03 10:40:30 GMT FROM: Jochen Greiner at MPI Adria Updike (Clemson University), Paulo Afonso, and Jochen Greiner (both MPE Garching) report on behalf of the GROND team: We observed the field of GRB 100331B (SuperAGILE; Del Monte et al., GCN #10560) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPI/ESO telescope at La Silla Observatory (Chile). Observations started at 09:31 UT on April 1, 2010, 12.37 hours after the GRB trigger, and a second epoch was taken beginning at 08:50 UT on April 2. They were performed at an average seeing of 1.0" and at an average airmass of 1.3. We do not detect a source within the Swift-XRT error circle reported by D'Elia et al. (GCN #10562). Upper limits from the first epoch are limited to the NIR bands; the GROND observation was executed prior to the Swift/XRT observation, and the XRT position turned out to be outside the FOV of our optical channels. On April 1, our upper limits were: J > 21.5, H > 21.0, K > 20.2 from a total of 960 seconds of exposure time. On April 2, our upper limits were: g' > 24.6, r' > 25.1, i' > 24.5, z' > 24.4, J > 22.6, H > 22.1 and K > 20.9 from a total of 2952 seconds of exposure in the optical bands and 2320 seconds in the NIR. These limits are derived based on calibrating the images against GROND zeropoints and 2MASS field stars and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)= 0.12 in the direction of the burst (Schlegel et al. 1998).