A strong limit on the very-high-energy emission from GRB 150323A

  title={A strong limit on the very-high-energy emission from GRB 150323A},
  author={Anushka Udara Abeysekara and Alex Archer and Wystan Benbow and Ralph Bird and Ruth Brose and M. Buchovecky and V. I. Bugaev and M. P. Connolly and Wen-zheng Cui and Manel Errando and Abraham Falcone and Qingguo Feng and John P. Finley and Abigail Flinders and Lucy Fortson and Anna Furniss and G. H. Gillanders and M. Hutten and D. Hanna and Olivier Hervet and Jamie Holder and Gareth. Hughes and T. B. Humensky and Clinton A Johnson and Philip Kaaret and Payel Kar and Nathan C. Kelley-Hoskins and M. Kertzman and D. Kieda and Marita Krause and Frank Krennrich and Matthew J. Lang and Tony T. Y. Lin and G. Maier and S. McArthur and P. Moriarty and Rupam Mukherjee and Shawn O'brien and Rene A. Ong and Nigel Park and Jeremy Shane Perkins and A. Petrashyk and Martin Pohl and A. Popkow and Elisa Pueschel and J. Quinn and K. Ragan and P. T. Reynolds and Gordon T. Richards and E. Roache and Cameron Boyd Rulten and Iftach Sadeh and Marcos Santander and G. H. Sembroski and Karlen Shahinyan and J. Tyler and Scott Patrick Wakely and O. M. Weiner and Amanda Weinstein and R. M. Wells and P. Wilcox and A. Wilhelm and David A. Williams and Benjamin Zitzer and Indrek Vurm and Andrei M. Beloborodov},
On 2015 March 23, VERITAS responded to a $Swift$-BAT detection of a gamma-ray burst, with observations beginning 270 seconds after the onset of BAT emission, and only 135 seconds after the main BAT emission peak. No statistically significant signal is detected above 140 GeV. The VERITAS upper limit on the fluence in a 40 minute integration corresponds to about 1% of the prompt fluence. Our limit is particularly significant since the very-high-energy (VHE) observation started only $\sim$2… CONTINUE READING

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