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TeV gamma-ray emission from PSR J2032+4127/ MT91 213 at periastron

ATel #10971; Razmik Mirzoyan for the MAGIC Collaboration and Reshmi Mukherjee for the VERITAS Collaboration
on 14 Nov 2017; 20:01 UT
Credential Certification: Razmik Mirzoyan (Razmik.Mirzoyan@mpp.mpg.de)

Subjects: >GeV, TeV, VHE, Binary, Pulsar

The MAGIC and VERITAS collaborations report a continuing increase in TeV gamma-ray emission from the 50-year period pulsar/ Be-star binary system PSR J2032+4127/ MT91 213 (RA 20h32m13.13s, Dec +41d27m24.4s, J2000.0). The system reached periastron on 13 November 2017. The Swift X-ray flux has dropped dramatically over the past two weeks (see ATEL #10920 and the Swift light curve). MAGIC and VERITAS observations are being conducted as part of a coordinated long-term monitoring campaign. TeV emission associated with the binary was first reported in ATEL #10810, covering observations up to late September 2017. The TeV flux has further increased since then. Preliminary analysis of the most recent observations gives integral fluxes above 200 GeV of 1.9e-11 ± 0.4e-11 photons cm^-2 s^-1 for an observation of 1.9 hours on Nov 12 (MJD 58069.8) with MAGIC. This implies an increase in the flux of almost a factor 10 with respect to the average flux in June-August. The flux measured by VERITAS is also enhanced, at the level of 1.3e-11 ± 0.2e-11 photons cm^-2 s^-1 for 4 hours of observations between Nov 10 and Nov 13. TeV observations with both instruments will continue with highest priority. We strongly encourage multi-wavelength observations. Contact persons for the MAGIC and VERITAS collaborations are Razmik Mirzoyan (Razmik.Mirzoyan@mpp.mpg.de) and Reshmi Mukherjee (rmukherj@nevis.columbia.edu). MAGIC is a system of two 17m-diameter Imaging Atmospheric Cherenkov Telescopes located at the Observatory Roque de Los Muchachos of the Instituto de Astrofísica de Canarias (IAC) on the Canary island of La Palma, Spain (https://magic.mpp.mpg.de). The VERITAS array is located at the Fred Lawrence Whipple Observatory in southern Arizona, USA (http://veritas.sao.arizona.edu).