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GRB110721A: AN EXTREME PEAK ENERGY AND SIGNATURES OF THE PHOTOSPHERE
Open accessAbstract
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 ∼24.5 s (in the GBM) and had a peak flux of (5.7 ± 0.2) × 10 −5 erg s −1 cm −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 ± 2 MeV, 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 10–100 MeV 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 ∼80 keV, and the decay showed a significant break after ∼2 s. The spectrum provides strong constraints on the standard synchrotron model, indicating that alternative mechanisms may give rise to the emission at these energies.
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THE LARGE AREA TELESCOPE ON THE FERMI GAMMA-RAY SPACE TELESCOPE MISSION
Atwood, W. B., Abdo, A. A., Ackermann, M., Althouse, W., Anderson, B., Axelsson, M., Baldini, L., Ballet, J., Band, D. L., Barbiellini, G., et al. (2009) · The Astrophysical Journal · doi:10.1088/0004-637x/697/2/1071 · Cited by 4,198
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Gruber, D., Goldstein, A., von Ahlefeld, V. W., Bhat, P. N., Bissaldi, E., Briggs, M. S., Byrne, D., Cleveland, W. H., Connaughton, V., Diehl, R., et al. (2014) · The Astrophysical Journal Supplement Series · doi:10.1088/0067-0049/211/1/12 · Cited by 401
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Kim, M. Y., Blattnig, S. R., Clowdsley, M. C., & Norman, R. B. (2017) · Space Weather · doi:10.1002/2016sw001552 · Cited by 4
Metadata
- Authors
- Axelsson, M., Baldini, L., Barbiellini, G., Baring, M. G., Bellazzini, R., Bregeon, J., Brigida, M., Bruel, P., Buehler, R., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Cecchi, C., Chaves, R. C. G., Chekhtman, A., Chiang, J., Claus, R., Conrad, J., Cutini, S., D'Ammando, F., de Palma, F., Dermer, C. D., do Couto e Silva, E., Drell, P. S., Favuzzi, C., Fegan, S. J., Ferrara, E. C., Focke, W. B., Fukazawa, Y., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giglietto, N., Giroletti, M., Godfrey, G., Guiriec, S., Hadasch, D., Hanabata, Y., Hayashida, M., Hou, X., Iyyani, S., Jackson, M. S., Kocevski, D., Kuss, M., Larsson, J., Larsson, S., Longo, F., Loparco, F., Lundman, C., Mazziotta, M. N., McEnery, J. E., Mizuno, T., Monzani, M. E., Moretti, E., Morselli, A., Murgia, S., Nuss, E., Nymark, T., Ohno, M., Omodei, N., Pesce-Rollins, M., Piron, F., Pivato, G., Racusin, J. L., Rainò, S., Razzano, M., Razzaque, S., Reimer, A., Roth, M., Ryde, F., Sanchez, D. A., Sgrò, C., Siskind, E. J., Spandre, G., Spinelli, P., Stamatikos, M., Tibaldo, L., Tinivella, M., Usher, T. L., Vandenbroucke, J., Vasileiou, V., Vianello, G., Vitale, V., Waite, A. P., Winer, B. L., Wood, K. S., Burgess, J. M., Bhat, P. N., Bissaldi, E., Briggs, M. S., Connaughton, V., Fishman, G., Fitzpatrick, G., Foley, S., Gruber, D., Kippen, R. M., Kouveliotou, C., Jenke, P., McBreen, S., McGlynn, S., Meegan, C., Paciesas, W. S., Pelassa, V., Preece, R., Tierney, D., von Kienlin, A., Wilson-Hodge, C., Xiong, S., & Pe'er, A.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2012-09-17
- Volume
- 757
- Issue
- 2
- Pages
- L31
- ISSN
- 2041-8205 (ISSN-L)
- 2041-8213
- OpenAlex
- W2143752374
- Cited by
- 200
- References
- 1
- FWCI
- 11.87
- Type
- journal article
- Language
- en
- Open access
- bronze
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- CoChat. (2026). Citation check: GRB110721A: AN EXTREME PEAK ENERGY AND SIGNATURES OF THE PHOTOSPHERE. https://app.cochat.ai/papers/10.1088/2041-8205/757/2/l31
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- Axelsson, M., Baldini, L., Barbiellini, G., Baring, M. G., Bellazzini, R., Bregeon, J., Brigida, M., Bruel, P., Buehler, R., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Cecchi, C., Chaves, R. C. G., Chekhtman, A., Chiang, J., Claus, R., Conrad, J., Cutini, S., . . . Pe'er, A. (2012). GRB110721A: AN EXTREME PEAK ENERGY AND SIGNATURES OF THE PHOTOSPHERE. The Astrophysical Journal. https://doi.org/10.1088/2041-8205/757/2/l31
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