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--- public:gw170817 [2022/01/22 02:21]
bruce created
+++ public:gw170817 [2022/04/15 23:53] (current)
bruce [The Search for the EM Counterpart]
@@ Line 5: / Line 5: @@
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-Trigger observed by Fermi, Integral.
+====== The Triggers / Detections ======
-I think these are the original optical references: 23. One-Meter Two-Hemisphere (1M2H) collaboration, GRB Coordinates Network 21529 (2017).
-. D. A. Coulter, et al., Science, doi:10.1126/science.aap9811 (2017).
-The transient was discovered optically by the 1M2H (1m telescopes in 2 hemispheres) collaboration, and I think that is the Coulter+17 paper above.
+Trigger detected by Fermi, Integral (though only ~ 3 sigma Integral (GCN 21507) I doubt this was a GCN socket trigger). Ligo Virgo Collaboration reported Aug 17 12:41:06 GMT 2017 (GCN at 13:21).
+====== The Search for the EM Counterpart ======
+The EM counterpart was discovered by the One-Meter Two-Hemisphere (1M2H) collaboration, GRB Coordinates Network 21529 (2017), and D. A. Coulter, et al., Science, doi:10.1126/science.aap9811 (2017).
+By 18:55 (GCN21516) they nailed it down to 15 galaxies in the GLADE catalog GLADE website: http://aquarius.elte.hu/glade/.  The GLADE folks say (https://arxiv.org/pdf/1804.05709.pdf) that EM signals from NS-NS GW events are most likely from galaxies of high B luminosity (star formation) or from high stellar mass, so some weighted combination of these properties makes for the best ranking of targets.
+Discovery optical Observations ~ 11 hr after trigger.
+First optical spectra 11.75 hrs after spectra Shappee+17; Earliest NIR spectrum 1.5 d, CHornock+17.
+Spectra
+All about the Spectra in Shappee+17 https://arxiv.org/pdf/1710.05432.pdf
+====== UV emission and importance and epoch ======
+Arcavi18 https://iopscience.iop.org/article/10.3847/2041-8213/aab267/pdf   says:
+  * UV in the first ~ 1-4 hr is critical in distinguishing models because the later models are degenerate (1)
+  * The discovery was postponed to 5 hr because of a "glitch" in one of the GW detectors (but BG notes this depended on weather, availability of SA telescope).
+(1) "The combined optical data show an early rise consistent with radioactive decay of low-opacity ejecta as the main emission source, but the subsequent decline is fit well by all models."
-Discovery optical Observations ~ 11 hr after trigger.  First optical spectra 11.75 hrs after spectra Shappee+17; Earliest NIR spectrum 1.5 d, CHornock+17.

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