//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 13157 SUBJECT: IPN Triangulation of GRB 120328B (long/intense) DATE: 12/03/28 15:05:38 GMT FROM: Valentin Pal'shin at Ioffe Inst K. Hurley, and J. Goldsten, on behalf of the MESSENGER GRNS GRB team, S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, V. Connaughton, M. Briggs, and C. Meegan, on behalf of the Fermi GBM team, S. Barthelmy, J. Cummings, N. Gehrels, H. Krimm, and D. Palmer, on behalf of the Swift-BAT team, A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, and G. Di Cocco, F. Fuschino, M. Galli, C. Labanti, and M. Marisaldi, on behalf of the AGILE MCAL team, report: The long-duration, intense GRB 120328B has been observed by Fermi (GBM: trigger 354608782), Konus-Wind, MESSENGER (GRNS), INTEGRAL (SPI-ACS), Swift (BAT), and AGILE (MCAL), so far, at about 23181 s UT (06:26:21). The burst was outside the coded field of view of the BAT. We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 229.038 (15h 16m 09s) +25.299 (+25d 17' 58") Corners: 227.666 (15h 10m 40s) +28.399 (+28d 23' 55") 228.177 (15h 12m 43s) +28.152 (+28d 09' 05") 230.230 (15h 20m 55s) +22.104 (+22d 06' 15") 229.765 (15h 19m 04s) +22.401 (+22d 24' 05") --------------------------------------------- The error box area is 2.15 sq. deg, and its maximum dimension is 6.7 deg. This box can be improved. The time history and spectrum will be given in forthcoming GCN Circulars. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB120328_T23186/IPN/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 13158 SUBJECT: Konus-Wind observation of GRB 120328B DATE: 12/03/28 15:07:31 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report: The long intense GRB 120328B (IPN localization: Hurley at al., GCN 13157) triggered Konus-Wind at T0=23186.645s UT (06:26:26.645) The light curve shows two main overlapping pulses which peaks are separated by ~15 s. A total burst duration of the burst ~50 s. The emission is seen up to ~8 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB120328_T23186/ As observed by Konus-Wind the burst had a fluence of (1.2 ± 0.1)x10-4 erg/cm2, and a 256-ms peak flux, measured from T0+4.352 s, of (1.5 ± 0.2)x10-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum of the burst (measured from T0 to T0+50.176 s) is best fitted in the 20 keV - 10 MeV range with the GRB (Band) model, for which: the low-energy photon index alpha = -1.08 (-0.07, +0.07), the high energy photon index beta = -2.2 (-0.2, +0.1), the peak energy Ep = 267(-30, +36) keV, chi2 = 111/86 dof. The spectrum at the maximum count rate (measured from T0+0.256s to T0+4.864 s) is best fitted is best fitted in the 20 keV - 10 MeV range with the GRB (Band) model, for which: the low-energy photon index alpha = -0.59 (-0.11, +0.09), the high energy photon index beta = -2.2 (-0.2, +0.1), the peak energy Ep = 430(-54, +66) keV, chi2 = 90.4/82 dof. All the quoted results are preliminary. All the quoted errors are at the 90% confidence level. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 13162 SUBJECT: long/intense GRB 120328B: MASTER follow up observations DATE: 12/03/28 16:26:33 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov, A.Kuznetsov, A.Sankovich Moscow Lomonosov State University, Sternberg Astronomical Institute, K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Krushinski, I.Zalozhnich, A. Popov, A. Bourdanov, A. Punanova Ural Federal University Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA) MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Tunka was started to survey IPN error box of the long/intense GRB 120328B (Hurley et al., GCN Circ 13157) 6 hours after GRB time at 2012-03-28 13:26:23 UT. The eroor box was arised. The weather was changed. The better images limit was about 18 unfiltered magnitudes. There is no OT inside IPN error box with 18 mag limit. MASTER-Tunka auto-detection system discovered faint OT source (4.1 sigma) at (RA, Dec) = 15h 06m 01.01s +28d 41m 59.8s on 2012-03-28.59161 UT (~7h45 min after GRB time) outside error IPN box (see map http://observ.pereplet.ru/images/GRB120328B_IPN_map_MASTER$ GRB120328B_IPN_map_MASTER.png ). The OT unfiltered magnitude is 17.9m (limit 18.0m). The OT is marginally seen at several images 2 images. There is no minor planet at this place. There is no known source at this place. We have reference image without OT on 2011-06-04.67172 UT with unfiltered magnitude limit 20.1m. Follow up observations will be continuated. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/150601.01284159.8.png The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 13163 SUBJECT: GRB 120328B: Fermi GBM detection DATE: 12/03/28 19:55:22 GMT FROM: Suzanne Foley at MPE S. Foley (UCD) reports on behalf of the Fermi GBM Team: "At 06:26:20.95 UT on 28 March 2012, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 120328B (trigger 354608782 / 120328268). The GBM on-ground location is consistent with the IPN error box (Hurley at al., GCN 13157). The angle from the Fermi LAT boresight is 69 degrees. The GBM light curve consists of two main pulses with a duration (T90) of about 30.5 s (50-300 keV). The time-averaged spectrum from T0+3.072 s to T0+34.816 s is best fit by a Band function with Epeak = 177.90 (+4.35/-4.16) keV, alpha = -0.75 +/-0.02, and beta = -2.00 +/-0.02 (CSTAT 1669.1 for 721 d.o.f.). The event fluence (10-1000 keV) in this time interval is (7.74 +/- 0.02)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+5.95 s in the 10-1000 keV band is 33.5 +/- 0.4 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 13165 SUBJECT: GRB 120328B: Fermi-LAT Observations DATE: 12/03/28 23:43:31 GMT FROM: Giacomo Vianello at SLAC G.Vianello (CIFS/SLAC), V. Vasileiou (CNRS/IN2P3/LUPM), D.Kocevski (Stanford) report on behalf of the Fermi LAT Team: Fermi-LAT has detected high energy emission from GRB 120328B in ground analysis. The GRB was triggered on by Fermi-GBM at 06:26:20 on March 28, 2012 (trigger 354608782, GCN 13163), and by Konus-Wind (GCN 13158). The best available position, provided by the IPN (GCN 13157), is ~66 deg off-axis, outside of the Fermi/LAT nominal field of view for the standard data analysis. Moreover, the zenith angle is ~105 deg, well within the region strongly contaminated by gamma-ray emission from the Earth's limb. Using a non-standard data selection most sensitive in the tens-of-MeV energy range and with a broader acceptance, we significantly detected the burst during the time interval of the prompt emission between T0 and ~T0+30 s. The significance of the excess corresponds to ~8 sigma. This data selection has insufficient spatial resolution to provide a reliable LAT localization. The GRB position entered the nominal field of view of the LAT ~2200 s after the trigger. A standard likelihood analysis on the time interval T0+2200 s - T0+3500 s does not show any excess at the position of the GRB. The Fermi LAT point of contact for this burst is Giacomo Vianello (giacomov@slac.stanford.edu). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 13193 SUBJECT: GRB 120328B: Pi of the Sky simultaneous upper limits DATE: 12/04/03 13:06:43 GMT FROM: Lech Wiktor Piotrowski at U Warsaw T.Batsch,A.Majcher,A.Majczyna,K.Nawrocki,M.Sokolowski,G.Wrochna (NCBJ, Swierk), M.Cwiok,L.W.Piotrowski,M.Zaremba,A.F.Zarnecki (University of Warsaw), K.Malek,L.Mankiewicz,R.Opiela,M.Siudek,V.Repei (CFT PAN), G.Kasprowicz (Warsaw University of Technology), from the "Pi of the Sky" collaboration ( http://grb.fuw.edu.pl ). The wide field "Pi of the Sky South" telescope, installed in the private observatory of Alain Maury in San Pedro de Atacama (http://grb.fuw.edu.pl/pi/index.html#spda_site.htm) observed coordinates of the GRB 120328B prior, during and after the reported IPN flash detection. No new source was identified. Following limiting magnitudes have been set: t_start - t0 [s] t_exp start (UT) end (UT) 3-sigma limit -15 10s 06:26:06 06:26:16 11.6 +1 10s 06:26:22 06:26:32 11.6 +16 10s 06:26:37 06:26:47 11.6 -165 20x10s 06:23:36 06:28:32 12.2 +152 20x10s 06:28:53 06:33:54 12.3 where limit is based on the reference star magnitudo in V filter. We acknowledge support received from Alain Maury at SPdA Observatory.