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Title: GRB110721A: An extreme peak energy and signatures of the photosphere

Abstract

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). This 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. We made this measurement 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.

Authors:
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Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
Fermi LAT Collaboration
OSTI Identifier:
1356670
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 757; Journal Issue: 2; Journal ID: ISSN 2041-8205
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; gamma-ray burst: general; gamma-ray burst: individual (GRB 110721A); radiation mechanisms: thermals

Citation Formats

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., and Pe'er, A. GRB110721A: An extreme peak energy and signatures of the photosphere. United States: N. p., 2012. Web. doi:10.1088/2041-8205/757/2/L31.
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. GRB110721A: An extreme peak energy and signatures of the photosphere. United States. doi:10.1088/2041-8205/757/2/L31.
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., and Pe'er, A. Mon . "GRB110721A: An extreme peak energy and signatures of the photosphere". United States. doi:10.1088/2041-8205/757/2/L31. https://www.osti.gov/servlets/purl/1356670.
@article{osti_1356670,
title = {GRB110721A: An extreme peak energy and signatures of the photosphere},
author = {Axelsson, M. and Baldini, L. and Barbiellini, G. and Baring, M. G. and Bellazzini, R. and Bregeon, J. and Brigida, M. and Bruel, P. and Buehler, R. and Caliandro, G. A. and Cameron, R. A. and Caraveo, P. A. and Cecchi, C. and Chaves, R. C. G. and Chekhtman, A. and Chiang, J. and Claus, R. and Conrad, J. and Cutini, S. and D'Ammando, F. and de Palma, F. and Dermer, C. D. and do Couto e Silva, E. and Drell, P. S. and Favuzzi, C. and Fegan, S. J. and Ferrara, E. C. and Focke, W. B. and Fukazawa, Y. and Fusco, P. and Gargano, F. and Gasparrini, D. and Gehrels, N. and Germani, S. and Giglietto, N. and Giroletti, M. and Godfrey, G. and Guiriec, S. and Hadasch, D. and Hanabata, Y. and Hayashida, M. and Hou, X. and Iyyani, S. and Jackson, M. S. and Kocevski, D. and Kuss, M. and Larsson, J. and Larsson, S. and Longo, F. and Loparco, F. and Lundman, C. and Mazziotta, M. N. and McEnery, J. E. and Mizuno, T. and Monzani, M. E. and Moretti, E. and Morselli, A. and Murgia, S. and Nuss, E. and Nymark, T. and Ohno, M. and Omodei, N. and Pesce-Rollins, M. and Piron, F. and Pivato, G. and Racusin, J. L. and Rainò, S. and Razzano, M. and Razzaque, S. and Reimer, A. and Roth, M. and Ryde, F. and Sanchez, D. A. and Sgrò, C. and Siskind, E. J. and Spandre, G. and Spinelli, P. and Stamatikos, M. and Tibaldo, L. and Tinivella, M. and Usher, T. L. and Vandenbroucke, J. and Vasileiou, V. and Vianello, G. and Vitale, V. and Waite, A. P. and Winer, B. L. and Wood, K. S. and Burgess, J. M. and Bhat, P. N. and Bissaldi, E. and Briggs, M. S. and Connaughton, V. and Fishman, G. and Fitzpatrick, G. and Foley, S. and Gruber, D. and Kippen, R. M. and Kouveliotou, C. and Jenke, P. and McBreen, S. and McGlynn, S. and Meegan, C. and Paciesas, W. S. and Pelassa, V. and Preece, R. and Tierney, D. and von Kienlin, A. and Wilson-Hodge, C. and Xiong, S. and Pe'er, A.},
abstractNote = {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). This 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. We made this measurement 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.},
doi = {10.1088/2041-8205/757/2/L31},
journal = {Astrophysical Journal Letters},
number = 2,
volume = 757,
place = {United States},
year = {2012},
month = {9}
}

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