Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/McLaughlintagP2205tp.pdf Дата изменения: Wed Feb 8 18:33:28 2006 Дата индексирования: Sat Dec 22 23:58:43 2007 Кодировка: Поисковые слова: crab nebula

Proposal Identification No.:

P2205

Date Received:

2006-Feb-01 13:23:49

Technical Page
Proposal Type: General Category: Observation Category: Total Time Requested: Prop osal Title: ABSTRACT: Regular Pulsars 21.5 Hours

Monitoring and Timing of RRAT Sources

We have recently reported the discovery of a new class of Rotating RAdio Transients (RRATs), 11 ob jects characterized by repeated radio bursts with widths of 2 to 30 ms. While periods in the 0.4 to 7 s range have been measured from the arrival times of the individual bursts, the RRATs are not detectable through standard pulsar search techniques that rely on their time-averaged emission. We have observed two of the RRATs, J1911+00 and J1913+1333, from Arecibo, revealing burst rates roughly 16 times that measured with Parkes and allowing us to measure a period of 6.9 seconds for J1911+00. The Arecibo observations of J1913+1333 have revealed an episode of enhanced bursting activity which lasts for several minutes, a new phenomenon quite different to the isolated bursts detected with Parkes. We request additional timing/monitoring observations that will help elucidate the emission mechanism(s) at play and also enable us to make more robust estimates of the total population of these ob jects (almost certainly several times greater than that of the normal radio pulsars).

Name Maura A McLaughlin

Institution Jodrell Bank Observatory

E-mail mclaughl@jb.man.ac.uk

Phone 44 1477 537751

Student no

Service Observing Request

Remot e Observing Request

X

None All of the observing run. Part of the observing run. Queue Observing

X

No Maybe Yes

Instrument Setup
L-wide 327

Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

RFI Considerations
1


Frequency Ranges Planned
314-364 MHz 1125-1625 MHz This proposal requires Iridium RFI protection at 1612 MHz between 10pm and 6am EST. This proposal requires coordination with Punta Salinas radar within the band 1222-1381 MHz.. This proposal requires coordination with GPS L3 at 1381 MHz.

2