{"product_id":"kilonova-gw170817-neutron-star-merger-physics-t-shirt","title":"Kilonova – GW170817 Neutron Star Merger Physics T-Shirt","description":"\u003cp\u003eTwo neutron-star dancers collide in a burst that rains gold. Gravity and light set off together and arrived neck and neck.\u003c\/p\u003e\u003ch3\u003eThe Physics\u003c\/h3\u003e\u003cp\u003eOn 17 Aug 2017 LIGO and Virgo detected gravitational waves from two neutron stars merging about 40 Mpc away. 1.74 ± 0.05 s later, gamma-ray burst GRB 170817A arrived. After a journey of about 130 million years, that tiny gap pins the speed of gravitational waves to the speed of light.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e−3 × 10⁻¹⁵ ≤ (v_gw − c)\/c ≤ +7 × 10⁻¹⁶\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ev_gw: gravitational-wave speed (m\/s)\u003c\/li\u003e\n\u003cli\u003ec: speed of light (m\/s)\u003c\/li\u003e\n\u003cli\u003e𝓜: chirp mass (kg), measured as 1.188 (+0.004\/−0.002) solar masses\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThe signal arrived on 17 Aug 2017 at 12:41:04 UTC, and multi-messenger astronomy began.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eHonest caveat:\u003c\/em\u003e The 1.74 s gap includes the delay in emitting the gamma rays, which did not leave at the same instant.\u003c\/p\u003e\u003ch3\u003eOn the shirt\u003c\/h3\u003e\u003cp\u003eFront: Kilonova, the pixel-art character, with the title. Back: the timeline, the speed bound, the chirp mass formula and the start of multi-messenger astronomy. Printed on a unisex tee.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"S \/ White","offer_id":50936548360295,"sku":"27316744195128222692","price":29.99,"currency_code":"USD","in_stock":true},{"title":"S \/ Black","offer_id":50936548393063,"sku":"23336451595456063454","price":29.99,"currency_code":"USD","in_stock":true},{"title":"M \/ White","offer_id":50936548425831,"sku":"29260615114098443207","price":29.99,"currency_code":"USD","in_stock":true},{"title":"M \/ Black","offer_id":50936548458599,"sku":"29692804541796106997","price":29.99,"currency_code":"USD","in_stock":true},{"title":"L \/ White","offer_id":50936548491367,"sku":"32758646277109056187","price":29.99,"currency_code":"USD","in_stock":true},{"title":"L \/ Black","offer_id":50936548524135,"sku":"27771187770989116794","price":29.99,"currency_code":"USD","in_stock":true},{"title":"XL \/ White","offer_id":50936548556903,"sku":"48481660498023829187","price":29.99,"currency_code":"USD","in_stock":true},{"title":"XL \/ Black","offer_id":50936548589671,"sku":"16337640203283631340","price":29.99,"currency_code":"USD","in_stock":true},{"title":"2XL \/ White","offer_id":50936548622439,"sku":"32667225721440806811","price":29.99,"currency_code":"USD","in_stock":true},{"title":"2XL \/ Black","offer_id":50936548655207,"sku":"22488273514801011220","price":29.99,"currency_code":"USD","in_stock":true},{"title":"3XL \/ White","offer_id":50936548687975,"sku":"21150369435495812113","price":29.99,"currency_code":"USD","in_stock":true},{"title":"3XL \/ Black","offer_id":50936548720743,"sku":"10891010583094757783","price":29.99,"currency_code":"USD","in_stock":true},{"title":"4XL \/ White","offer_id":50936548753511,"sku":"29135368977850950787","price":29.99,"currency_code":"USD","in_stock":true},{"title":"4XL \/ Black","offer_id":50936548786279,"sku":"11964099345983940742","price":29.99,"currency_code":"USD","in_stock":true},{"title":"5XL \/ White","offer_id":50936548819047,"sku":"21500888084949873884","price":29.99,"currency_code":"USD","in_stock":true},{"title":"5XL \/ Black","offer_id":50936548851815,"sku":"29424542615513743057","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/gw170817_front_01_white.png?v=1793595490","url":"https:\/\/pixelatedphysics.com\/ko\/products\/kilonova-gw170817-neutron-star-merger-physics-t-shirt","provider":"Pixelated Physics","version":"1.0","type":"link"}