# Horak 1980: Vela Event Alert 747

> Henry G. (Los Alamos Scientific Laboratory) Horak, 1980. 2 records on Mysteries Department cite it. A weapons-laboratory judgement and the DSP…

Source: https://mysteriesdept.com/sources/SRC0CW4WJGE03ET/vela-event-alert-747  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Sources](https://mysteriesdept.com/sources)[1979 Vela incident](https://mysteriesdept.com/mysteries/vela-incident)Horak 1980

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# Vela Event Alert 747

Henry G. (Los Alamos Scientific Laboratory) Horak, 1980. _National Security Archive Electronic Briefing Book 190, Document 7_.

May 1980 Los Alamos analysis of why the bhangmeters on two Defense Support Program satellites did not trigger (event outside their field of view, or signal weakened by cloud) and concluding there was "strong evidence that a nuclear explosion actually produced Vela Alert 747".

**1979 Vela incident** ReportChecked against the original0

## What it's used for here

A weapons-laboratory judgement and the DSP non-detection.

## The document 27 pages

[Pages]Page 1 of 27

[![Page 1](https://mysteriesdept.com/files/v/ab59648090d1e81a43fb9f5f3bdf53937341e1da5b30aabbba136f35e7b3d143/p1)1][![Page 2](https://mysteriesdept.com/files/v/ab59648090d1e81a43fb9f5f3bdf53937341e1da5b30aabbba136f35e7b3d143/p2)2][![Page 3](https://mysteriesdept.com/files/v/ab59648090d1e81a43fb9f5f3bdf53937341e1da5b30aabbba136f35e7b3d143/p3)3][![Page 4](https://mysteriesdept.com/files/v/ab59648090d1e81a43fb9f5f3bdf53937341e1da5b30aabbba136f35e7b3d143/p4)4][![Page 5](https://mysteriesdept.com/files/v/ab59648090d1e81a43fb9f5f3bdf53937341e1da5b30aabbba136f35e7b3d143/p5)5][![Page 6](https://mysteriesdept.com/files/v/ab59648090d1e81a43fb9f5f3bdf53937341e1da5b30aabbba136f35e7b3d143/p6)6][![Page 7](https://mysteriesdept.com/files/v/ab59648090d1e81a43fb9f5f3bdf53937341e1da5b30aabbba136f35e7b3d143/p7)7][![Page 8](https://mysteriesdept.com/files/v/ab59648090d1e81a43fb9f5f3bdf53937341e1da5b30aabbba136f35e7b3d143/p8)8][![Page 9](https://mysteriesdept.com/files/v/ab59648090d1e81a43fb9f5f3bdf53937341e1da5b30aabbba136f35e7b3d143/p9)9][![Page 10](https://mysteriesdept.com/files/v/ab59648090d1e81a43fb9f5f3bdf53937341e1da5b30aabbba136f35e7b3d143/p10)10][![Page 11](https://mysteriesdept.com/files/v/ab59648090d1e81a43fb9f5f3bdf53937341e1da5b30aabbba136f35e7b3d143/p11)11][![Page 12](https://mysteriesdept.com/files/v/ab59648090d1e81a43fb9f5f3bdf53937341e1da5b30aabbba136f35e7b3d143/p12)12]

![Page 1 of Vela Event Alert 747](https://mysteriesdept.com/files/v/ab59648090d1e81a43fb9f5f3bdf53937341e1da5b30aabbba136f35e7b3d143/p1)

The first 12 pages are shown; the rest are in the file. Pages from the file we keep.

## Cited by on this site 2 records

[Defense Support Program satellites with overlapping coverage did not trigger.](https://mysteriesdept.com/mysteries/vela-incident/evidence/EVD0CW4X0NJ0F0D/defense-support-program-satellites-with-overlapping-coverage)

Evidence

EVD

[The 1979 Vela incident](https://mysteriesdept.com/mysteries/vela-incident)

The mystery article

MYS

## Cite it

```
Horak, H. G. (. A. S. L. (1980). Vela Event Alert 747. National Security Archive Electronic Briefing Book 190, Document 7. https://nsarchive2.gwu.edu/NSAEBB/NSAEBB190/07.pdf
```

[Read it free at nsarchive2.gwu.edu](https://nsarchive2.gwu.edu/NSAEBB/NSAEBB190/07.pdf)[Download PDF · 715 KB](https://mysteriesdept.com/files/d/ab59648090d1e81a43fb9f5f3bdf53937341e1da5b30aabbba136f35e7b3d143)

Anyone can read it here; members can download it.

Key

**SRC** 0CW4WJGE03ET

Kind

Report

Rights

public-domain

Kept

27 Oct 2026

Checked

Against the published original

Added by

[apollo](https://mysteriesdept.com/u/apollo)

The record

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