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Heather Swan Physics Department University of Michigan Carl Akerlof, Timothy McKay, Eli Rykoff, Donald Smith, U of Michigan Mark Skinner, Andrew Alday, Kevin Moore, Boeing LTS. Measuring Fast Spectral Variability of. GRB Early Afterglows with the. AEOS Burst Camera. Image of M8, taken by

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Slide1 l.jpg

Heather Swan

Physics Department

University of Michigan

Carl Akerlof, Timothy McKay, Eli Rykoff, Donald Smith, U of Michigan

Mark Skinner, Andrew Alday, Kevin Moore, Boeing LTS

Measuring Fast Spectral Variability of

GRB Early Afterglows with the

AEOS Burst Camera

Image of M8, taken by

the AEOS Burst Camera

1


Outline l.jpg
Outline

  • Why?

  • What is the AEOS and ABC?

  • GRB response

  • Data and simulations


Grb 030418 was dimmer than expected at early times l.jpg
GRB 030418 was dimmer than expected at early times

Circum-burst absorbs

optical light

if we could see the spectrum, we would expect to see

red -> blue

Optical lightcurve

First image ~76s

after g-rays


Grb 990123 was brighter than expected at early times l.jpg
GRB 990123 was brighter than expected at early times

Relativistic fireball – example of a reverse shock

if we could see the spectrum, we would expect to see

blue ->red

Optical lightcurve

g-rays were still emitting for first few images


Swift s bat error box is the perfect size for the abc l.jpg
Swift’s BAT error box is the perfect size for the ABC

90% will be localized to a 3 arc minute radius

(Can see them with the ABC)

50% will be localized within 12 seconds

(Can see them promptly)

(From Fenimore, et al)


The aeos telescope is a large optical telescope used by the air force l.jpg
The AEOS telescope is a large optical telescope used by the Air Force

Advanced Electro-Optical Systems Telescope (AEOS)

Largest ground based AF optical telescope (3.67m)

Designed to track satellites, can quickly (~20 sec) slew to coordinates

Located in Haleakala, Hawaii, at 10,000 ft

ABC

6


The aeos burst camera abc is attached to the aeos l.jpg
The AEOS Burst Camera (ABC) is attached to the AEOS Air Force

  • Optics designed by Carl Akerlof

  • Package designed by Alan Schier

  • Camera built by Astronomical Research Cameras

    Field of view 6' x 6'

    Focal length of 15.5m

    9 ToO observations / year

Limiting Mag ~22nd for 10 sec exposure


The abc will try to observe grbs within minutes after they are localized l.jpg

GRB Air Force

Swift

ABC Computers

(Modified ROTSE

Software)

User Interface

GCN

Burst

Filter

Fax

:::::::

:::::::

CD

The ABC will try to observe GRBs within minutes after they are localized


No prompt response yet l.jpg
No prompt response yet… Air Force

  • GRB needs to be < 1 hour old and visible in Maui

  • The few that have been attempted

    • Bad weather

    • Bad pointing

  • Several test bursts have been sent

    • Responses between 1 and 10 minutes

  • One was caught during testing (030329)

    • Images taken several days after the event

GRB 030329


A diffraction grating was recently installed on the abc l.jpg
A diffraction grating was recently installed on the ABC Air Force

  • Low resolving power (8)

  • Installed Jan ’05

A light bulb viewed through the grating, and a star….


Simulations of the grating are similar to what is seen l.jpg
Simulations of the grating are similar to what is seen Air Force

Blackbody, sun’s temp

1st

0th

2nd

higher orders

Image from ABC of a star

The blaze angle was chosen so most of the light would be in the 1st order


We can differentiate between blue and red stars l.jpg
We can differentiate between blue and red stars Air Force

Cooler temps

Hotter temps

Simulations of different

temperature blackbodies


We can differentiate between different types of objects l.jpg
We can differentiate between different types of objects Air Force

Quasar

Star

Symbiotic

binary


In summary the abc is up and running we re just waiting for a grb l.jpg
In summary, the ABC is up and running, we’re just waiting for a GRB

  • The ABC can quickly and deeply observe GRBs

    • First image within minutes of GRB detection

    • Small 6’ x 6’ field of view

    • Deep (22nd mag) images with 10s exposures

  • The ABC has a diffraction grating

    • Will get early spectral information for GRBs

Questions?


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