Preece, R.Burgess, J. Michaelvon Kienlin, A.Bhat, P.N.Briggs, M.S.Byrne, D.Chaplin, V.Cleveland, W.Collazzi, A.C.Connaughton, V.Diekmann, A.Fitzpatrick, G.Foley, S.Gibby, M.Giles, M.Goldstein, A.Greiner, J.Gruber, D.Jenke, P.Kippen, R.M.Kouveliotou, C.McBreen, S.Meegan, C.Paciesas, W.S.Pelassa, V.Tierney, D.van der Horst, A.J.Wilson-Hodge, C.Xiong, S.Younes, G.Yu, H.-F.Ackermann, M.Ajello, M.Axelsson, M.Baldini, L.Barbiellini, G.Baring, M.G.Bastieri, D.Bellazzini, R.Bissaldi, E.Bonamente, E.Bregeon, J.Brigida, M.Bruel, P.Buehler, R.Buson, S.Caliandro, G.A.Cameron, R.A.Caraveo, P.A.Cecchi, C.Charles, E.Chekhtman, A.Chiang, J.Chiaro, G.Ciprini, S.Claus, R.Cohen-Tanugi, J.Cominsky, L.R.Conrad, J.D'Ammando, F.de Angelis, A.de Palma, F.Dermer, C.D.Desiante, R.Digel, S.W.Di Venere, L.Drell, P.S.Drlica-Wagner, A.Favuzzi, C.Franckowiak, A.Fukazawa, Y.Fusco, P.Gargano, F.Gehrels, N.Germani, S.Giglietto, N.Giordano, F.Giroletti, M.Godfrey, G.Granot, J.Grenier, I.A.Guiriec, S.Hadasch, D.Hanabata, Y.Harding, A.K.Hayashida, M.Iyyani, S.Jogler, T.Jóhannesson, G.Kawano, T.Knödlseder, J.Kocevski, D.Kuss, M.Lande, J.Larsson, J.Larsson, S.Latronico, L.Longo, F.Loparco, F.Lovellette, M.N.Lubrano, P.Mayer, M.Mazziotta, M.N.Michelson, P.F.Mizuno, T.Monzani, M.E.Moretti, E.Morselli, A.Murgia, S.Nemmen, R.Nuss, E.Nymark, T.Ohno, M.Ohsugi, T.Okumura, A.Omodei, N.Orienti, M.Paneque, D.Perkins, J.S.Pesce-Rollins, M.Piron, F.Pivato, G.Porter, T.A.Racusin, J.L.Rainò, S.Rando, R.Razzano, M.Razzaque, S.Reimer, A.Reimer, O.Ritz, S.Roth, M.Ryde, F.Sartori, A.Scargle, J.D.Schulz, A.Sgrò, C.Siskind, E.J.Spandre, G.Spinelli, P.Suson, D.J.Tajima, H.Takahashi, H.Thayer, J.G.Thayer, J.B.Tibaldo, L.Tinivella, M.Torres, D.F.Tosti, G.Troja, E.Usher, T.L.Vandenbroucke, J.Vasileiou, V.Vianello, G.Vitale, V.Werner, M.Winer, B.L.Wood, K.S.Zhu, S.2015-07-082015-07-082014Preece, R., Burgess, J. Michael, von Kienlin, A., et al.. "The First Pulse of the Extremely Bright GRB 130427A: A Test Lab for Synchrotron Shocks." <i>Science,</i> 343, no. 6166 (2014) American Association for the Advancement of Science: 51-54. http://dx.doi.org/10.1126/science.1242302.https://hdl.handle.net/1911/80849Gamma-ray burst (GRB) 130427A is one of the most energetic GRBs ever observed. The initial pulse up to 2.5 seconds is possibly the brightest well-isolated pulse observed to date. A fine time resolution spectral analysis shows power-law decays of the peak energy from the onset of the pulse, consistent with models of internal synchrotron shock pulses. However, a strongly correlated power-law behavior is observed between the luminosity and the spectral peak energy that is inconsistent with curvature effects arising in the relativistic outflow. It is difficult for any of the existing models to account for all of the observed spectral and temporal behaviors simultaneously.engThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is the AAAS.Journal articlehttp://dx.doi.org/10.1126/science.1242302