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NICER / ISS Science Nugget
for November 18, 2021



NICER Cycle 4 Guest Observer Proposals Top Prior-year Totals

In response to its 4th call for proposals requesting observing time on a variety of targets, NICER received 107 Guest Observer (GO) submissions before the November 10 deadline. With 415 unique Principal and Co-Investigators hailing from 29 countries (see Figure), the Cycle 4 GO proposals cover 278 astrophysical targets across a handful of categories including neutron stars, black holes, and normal stars in our Galaxy; supermassive black holes in distant galaxies; and even comets within our own Solar System. The total exposure time requested was 14 million seconds, representing a 2x oversubscription rate, and 61 of the proposals requested "target of opportunity" time triggered by other facilities or NICER monitoring observations. Student thesis projects make up 31 of the submitted proposals.


Twenty-nine countries, shown in red, host 415 unique Principal and Co-Investigators of NICER Cycle 4 Guest Observer proposals submitted for the November 10, 2021 deadline.



Figure: Twenty-nine countries, shown in red, host 415 unique Principal and Co-Investigators of NICER Cycle 4 Guest Observer proposals submitted for the November 10, 2021 deadline.



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