The First Pulse of the Extremely Bright GRB 130427A: A Test Lab for Synchrotron Shocks

Preece R; Burgess JM; von Kienlin A; Bhat PN; Briggs MS; Byrne D; Chaplin V; Cleveland W; Collazzi AC; Connaughton V; Diekmann A; Fitzpatrick G; Foley S; Gibby M; Giles M; Goldstein A; Greiner J; Gruber D; Jenke P; Kippen RM; Kouveliotou C; McBreen S; Meegan C; Paciesas WS; Pelassa V; Tierney D; van der Horst AJ; Wilson-Hodge C; Xiong S; Younes G; Yu HF; Ackermann M; Ajello M; Axelsson M; Baldini L; Barbiellini G; Baring MG; Bastieri D; Bellazzini R; Bissaldi E; Bonamente E; Bregeon J; Brigida M; Bruel P; Buehler R; Buson S; Caliandro GA; Cameron RA; Caraveo PA; Cecchi C; Charles E; Chekhtman A; Chiang J; Chiaro G; Ciprini S; Claus R; Cohen-Tanugi J; Cominsky LR; Conrad J; D'Ammando F; de Angelis A; de Palma F; Dermer CD; Desiante R; Digel SW; Di Venere L; Drell PS; 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 IA; Guiriec S; Hadasch D; Hanabata Y; Harding AK; Hayashida M; Iyyani S; Jogler T; Joannesson G; Kawano T; Knodlseder J; Kocevski D; Kuss M; Lande J; Larsson J; Larsson S; Latronico L; Longo F; Loparco F; Lovellette MN; Lubrano P; Mayer M; Mazziotta MN; Michelson PF; Mizuno T; Monzani ME; 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 JS; Pesce-Rollins M; Piron F; Pivato G; Porter TA; Racusin JL; Raino S; Rando R; Razzano M; Razzaque S; Reimer A; Reimer O; Ritz S; Roth M; Ryde F; Sartori A; Scargle JD; Schulz A; Sgro C; Siskind EJ; Spandre G; Spinelli P; Suson DJ; Tajima H; Takahashi H; Thayer JG; Thayer JB; Tibaldo L; Tinivella M; Torres DF; Tosti G; Troja E; Usher TL; Vandenbroucke J; Vasileiou V; Vianello G; Vitale V; Werner M; Winer BL; Wood KS; Zhu S

Science, Vol.343, No.6166, 51-54, 2014

DOI10.1126/science.1242302 Export Citation

The First Pulse of the Extremely Bright GRB 130427A: A Test Lab for Synchrotron Shocks

Preece R, Burgess JM, von Kienlin A, Bhat PN, Briggs MS, Byrne D, Chaplin V, Cleveland W, Collazzi AC, Connaughton V, Diekmann A, Fitzpatrick G, Foley S, Gibby M, Giles M, Goldstein A, Greiner J, Gruber D, Jenke P, Kippen RM, Kouveliotou C, McBreen S, Meegan C, Paciesas WS, Pelassa V, Tierney D, van der Horst AJ, Wilson-Hodge C, Xiong S, Younes G, Yu HF, Ackermann M, Ajello M, Axelsson M, Baldini L, Barbiellini G, Baring MG, Bastieri D, Bellazzini R, Bissaldi E, Bonamente E, Bregeon J, Brigida M, Bruel P, Buehler R, Buson S, Caliandro GA, Cameron RA, Caraveo PA, Cecchi C, Charles E, Chekhtman A, Chiang J, Chiaro G, Ciprini S, Claus R, Cohen-Tanugi J, Cominsky LR, Conrad J, D'Ammando F, de Angelis A, de Palma F, Dermer CD, Desiante R, Digel SW, Di Venere L, Drell PS, 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 IA, Guiriec S, Hadasch D, Hanabata Y, Harding AK, Hayashida M, Iyyani S, Jogler T, Joannesson G, Kawano T, Knodlseder J, Kocevski D, Kuss M, Lande J, Larsson J, Larsson S, Latronico L, Longo F, Loparco F, Lovellette MN, Lubrano P, Mayer M, Mazziotta MN, Michelson PF, Mizuno T, Monzani ME, 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 JS, Pesce-Rollins M, Piron F, Pivato G, Porter TA, Racusin JL, Raino S, Rando R, Razzano M, Razzaque S, Reimer A, Reimer O, Ritz S, Roth M, Ryde F, Sartori A, Scargle JD, Schulz A, Sgro C, Siskind EJ, Spandre G, Spinelli P, Suson DJ, Tajima H, Takahashi H, Thayer JG, Thayer JB, Tibaldo L, Tinivella M, Torres DF, Tosti G, Troja E, Usher TL, Vandenbroucke J, Vasileiou V, Vianello G, Vitale V, Werner M, Winer BL, Wood KS, Zhu S

Gamma-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.