GRB110721A: An extreme peak energy and signatures of the photosphere

M. Axelsson, L. Baldini, G. Barbiellini, M. G. Baring, R. Bellazzini, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, C. Cecchi, R. C.G. Chaves, A. Chekhtman, J. Chiang, R. Claus, J. Conrad, S. Cutini, F. D'AmmandoF. De Palma, C. D. Dermer, E. Do Couto E Silva, P. S. Drell, C. Favuzzi, S. J. Fegan, E. C. Ferrara, W. B. Focke, Y. Fukazawa, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, M. Giroletti, G. Godfrey, S. Guiriec, D. Hadasch, Y. Hanabata, M. Hayashida, X. Hou, S. Iyyani, M. S. Jackson, D. Kocevski, M. Kuss, J. Larsson, S. Larsson, F. Longo, F. Loparco, C. Lundman, M. N. Mazziotta, J. E. McEnery, T. Mizuno, M. E. Monzani, E. Moretti, A. Morselli, S. Murgia, E. Nuss, T. Nymark, M. Ohno, N. Omodei, M. Pesce-Rollins, F. Piron, G. Pivato, J. L. Racusin, S. Rainò, M. Razzano, S. Razzaque, A. Reimer, M. Roth, F. Ryde, D. A. Sanchez, C. Sgrò, E. J. Siskind, G. Spandre, P. Spinelli, M. Stamatikos, L. Tibaldo, M. Tinivella, T. L. Usher, J. Vandenbroucke, V. Vasileiou, G. Vianello, V. Vitale, A. P. Waite, B. L. Winer, K. S. Wood, J. M. Burgess, P. N. Bhat, E. Bissaldi, M. S. Briggs, V. Connaughton, G. Fishman, G. Fitzpatrick, S. Foley, D. Gruber, R. M. Kippen, C. Kouveliotou, P. Jenke, S. McBreen, S. McGlynn, C. Meegan, W. S. Paciesas, V. Pelassa, R. Preece, D. Tierney, A. Von Kienlin, C. Wilson-Hodge, S. Xiong, A. Pe'Er

Research output: Contribution to journalArticlepeer-review

152 Citations (Scopus)


GRB110721A was observed by the Fermi Gamma-ray Space Telescope using its two instruments, the Large Area Telescope (LAT) and the Gamma-ray Burst Monitor (GBM). The burst consisted of one major emission episode which lasted for 24.5s (in the GBM) and had a peak flux of (5.7 ± 0.2) × 10 -5ergs-1cm-2. The time-resolved emission spectrum is best modeled with a combination of a Band function and a blackbody spectrum. The peak energy of the Band component was initially 15 ± 2MeV, which is the highest value ever detected in a GRB. This measurement was made possible by combining GBM/BGO data with LAT Low Energy events to achieve continuous 10-100MeV coverage. The peak energy later decreased as a power law in time with an index of -1.89 ± 0.10. The temperature of the blackbody component also decreased, starting from 80keV, and the decay showed a significant break after 2s. The spectrum provides strong constraints on the standard synchrotron model, indicating that alternative mechanisms may give rise to the emission at these energies.

Original languageEnglish
Article numberL31
JournalAstrophysical Journal Letters
Issue number2
Publication statusPublished - 1 Oct 2012
Externally publishedYes


  • gamma-ray burst: general
  • gamma-ray burst: individual (GRB110721A)
  • radiation mechanisms: thermal

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'GRB110721A: An extreme peak energy and signatures of the photosphere'. Together they form a unique fingerprint.

Cite this