12-20 July 2017
BEXCO
Asia/Seoul timezone
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Contribution

BEXCO - Room F(201/202/203/204)

[GA195] Search of extended and/or delayed TeV emission from GRBs with HAWC

Speakers

  • Magdalena GONZÁLEZ

Co-authors

  • Ana BECERRIL (Instituto de Física, Universidad Nacional Autónoma de México, México D.F., México)
  • Ruben ALFARO (Instituto de Física, Universidad Nacional Autónoma de México, México D.F., México)
  • Nissim FRAIJA (Instituto de Astronomía, Universidad Nacional Autónoma de México, México D.F., México)
  • Ibrahim TORRES (Instituto Nacional de Astrofísica, Óptica y Electrónica, Tonantzintla, Puebla, Mexico)
  • Magdalena GONZÁLEZ (Instituto de Astronomía, Universidad Nacional Autónoma de México, México D.F., México)
  • Simone DICHIARA (Instituto de Astronomía, Universidad Nacional Autónoma de México, México D.F., México)
  • Dirk LENNARZ (School of Physics and Center for Relativistic Astrophysics, Georgia Institute of Technology, Atlanta, Georgia, USA)

Description

Gamma-ray bursts (GRBs) are among the most luminous sources in the universe and the nature of their emission up to very high energy is one of the most important open issue connected to the study of these peculiar events. The High Altitude Water Cherenkov (HAWC) gamma-ray observatory, installed at an altitude of 4100 m a. s. l. in the state of Puebla (Mexico) completed its second year of full operations. Thanks to its instantaneous field of view of ∼ 2 sr and its high duty cycle (≥ 95%), HAWC is an ideal instrument for the study of transient phenomena such as GRBs. We performed a search of TeV emission delayed with respect to, and of longer duration than, the prompt emission observed by satellites. We present here the results obtained by observing at the position of a sample of GRBs detected by the Fermi and SWIFT satellites up to may 2017. The upper limits resulting from this analysis are presented and possible theoretical implications are discussed.