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  Search for very-high-energy emission from Gamma-ray Bursts using the first 18 months of data from the HAWC Gamma-ray Observatory

The HAWC Collaboration, Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., et al. (2017). Search for very-high-energy emission from Gamma-ray Bursts using the first 18 months of data from the HAWC Gamma-ray Observatory. The Astrophysical Journal, 843(2): 88. doi:10.3847/1538-4357/aa756f.

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The HAWC Collaboration, Author
Alfaro, R., Author
Alvarez, C., Author
Álvarez, J. D., Author
Arceo, R., Author
Arteaga-Velázquez, J. C., Author
Rojas, D. Avila, Author
Solares, H. A. Ayala, Author
Barber, A. S., Author
Bautista-Elivar, N., Author
Becerril, A., Author
Belmont-Moreno, E., Author
BenZvi, S. Y., Author
Bernal, A., Author
Braun, J., Author
Brisbois, C., Author
Caballero-Mora, K. S., Author
Capistrán, T., Author
Carramiñana, A., Author
Casanova, S.1, Author           
Castillo, M., AuthorCotti, U., AuthorCotzomi, J., Authorde León, S. Coutiño, Authorde la Fuente, E., AuthorDe León, C., AuthorDeYoung, T., AuthorHernandez, R. Diaz, AuthorDingus, B. L., AuthorDuVernois, M. A., AuthorDíaz-Vélez, J. C., AuthorEllsworth, R. W., AuthorEngel, K., AuthorFiorino, D. W., AuthorFraija, N., AuthorGarcía-González, J. A., AuthorGarfias, F., AuthorGerhardt, M., AuthorMuñoz, A. González, AuthorGonzález, M. M., AuthorGoodman, J. A., AuthorHampel-Arias, Z., AuthorHarding, J. P., AuthorHernandez-Almada, A., AuthorHernandez, S., AuthorHona, B., AuthorHui, C. M., AuthorHüntemeyer, P., AuthorIriarte, A., AuthorJardin-Blicq, A.2, Author           Joshi, V.2, Author           Kaufmann, S., AuthorKieda, D., AuthorLauer, R. J., AuthorLee, W. H., AuthorLennarz, D., AuthorVargas, H. León, AuthorLinnemann, J. T., AuthorLonginotti, A. L., AuthorRaya, G. Luis, AuthorLuna-García, R., AuthorMalone, K., AuthorMarinelli, S. S., AuthorMartinez, O., AuthorMartinez-Castellanos, I., AuthorMartínez-Castro, J., AuthorMartínez-Huerta, H., AuthorMatthews, J. A., AuthorMiranda-Romagnoli, P., AuthorMoreno, E., AuthorMostafá, M., AuthorNellen, L., AuthorNewbold, M., AuthorNoriega-Papaqui, R., AuthorPelayo, R., AuthorPérez-Pérez, E. G., AuthorPretz, J., AuthorRen, Z., AuthorRho, C. D., AuthorRivière, C., AuthorRosa-González, D., AuthorRosenberg, M., AuthorRuiz Velasco, E.2, Author           Salazar, H., AuthorGreus, F. Salesa, AuthorSandoval, A., AuthorSchneider, M., AuthorSchoorlemmer, H.2, Author           Sinnis, G., AuthorSmith, A. J., AuthorSpringer, R. W., AuthorSurajbali, P.2, Author           Taboada, I., AuthorTibolla, O., AuthorTollefson, K., AuthorTorres, I., AuthorUkwatta, T. N., AuthorVianello, G., AuthorWeisgarber, T., AuthorWesterhoff, S., AuthorWood, J., AuthorYapici, T., AuthorYounk, P. W., AuthorZepeda, A., AuthorZhou, H., Author more..
Affiliations:
1Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society, ou_904550              
2Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society, ou_2074298              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
 MPINP: HAWC - Abteilung Hinton
 Abstract: The High Altitude Water Cherenkov (HAWC) Gamma-ray Observatory is an
extensive air shower detector operating in central Mexico, which has recently
completed its first two years of full operations. If for a burst like GRB
130427A at a redshift of 0.34 and a high-energy component following a power law
with index -1.66, the high-energy component is extended to higher energies with
no cut-off other than from extragalactic background light attenuation, HAWC
would observe gamma rays with a peak energy of $\sim$300 GeV. This paper
reports the results of HAWC observations of 64 gamma-ray bursts (GRBs) detected
by $\mathit{Swift}$ and $\mathit{Fermi}$, including three GRBs that were also
detected by the Large Area Telescope ($\mathit{Fermi}$-LAT). An ON/OFF analysis
method is employed, searching on the time scale given by the observed light
curve at keV-MeV energies and also on extended time scales. For all GRBs and
time scales, no statistically significant excess of counts is found and upper
limits on the number of gamma rays and the gamma-ray flux are calculated. GRB
170206A, the third brightest short GRB detected by the Gamma-ray Burst Monitor
on board the $\mathit{Fermi}$ satellite ($\mathit{Fermi}$-GBM) and also
detected by the LAT, occurred very close to zenith. The LAT measurements can
neither exclude the presence of a synchrotron self-Compton (SSC) component nor
constrain its spectrum. Instead, the HAWC upper limits constrain the expected
cut-off in an additional high-energy component to be less than $100~\rm{GeV}$
for reasonable assumptions about the energetics and redshift of the burst.

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 Dates: 2017-07-06
 Publication Status: Published online
 Pages: 19 pages, 6 figures, published in ApJ
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Degree: -

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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 843 (2) Sequence Number: 88 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3