[vsnet-obs 55438] Re: [vsnet-alert 8966] PKS 2155-304 gamma-ray outburst

Sun Jul 30 22:16:33 JST 2006

Hello,

A single visual observation shows the optical brightening of this blazer:

PKS2155-304   20050730.489   124   WPX

Regards

Peter Williams
Heathcote NSW

-----Original Message-----
From: vsnet-alert-bounces at ooruri.kusastro.kyoto-u.ac.jp
[mailto:vsnet-alert-bounces at ooruri.kusastro.kyoto-u.ac.jp]On Behalf Of
Taichi Kato
Sent: Friday, 28 July 2006 11:05 AM
To: variable_star_forum at yahoogroups.com;
vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp; vsnet-alert at yahoogroups.com;
vsnet-campaign-blazar at ooruri.kusastro.kyoto-u.ac.jp
Subject: [vsnet-alert 8966] PKS 2155-304 gamma-ray outburst

   According to ATEL, the blazar PKS 2155-304 has underwent
a gamma-ray outburst.  Although no visual observations have been
recently reported, the ASAS-3 data indicate that the optical
brightness was rising in June (no data available for July).

The object is located at:
RA   (2000.0): 215851.9
Dec. (2000.0): -301331

PKS2155-304    20060405.413  13.146V  ASA (ASAS Survey)
PKS2155-304    20060410.406  12.966V  ASA (ASAS Survey)
PKS2155-304    20060425.392  13.046V  ASA (ASAS Survey)
PKS2155-304    20060506.304  13.098V  ASA (ASAS Survey)
PKS2155-304    20060506.333  12.978V  ASA (ASAS Survey)
PKS2155-304    20060506.364  13.203V  ASA (ASAS Survey)
PKS2155-304    20060506.391  13.063V  ASA (ASAS Survey)
PKS2155-304    20060506.421  13.161V  ASA (ASAS Survey)
PKS2155-304    20060507.277  13.192V  ASA (ASAS Survey)
PKS2155-304    20060507.303  13.140V  ASA (ASAS Survey)
PKS2155-304    20060507.332  13.205V  ASA (ASAS Survey)
PKS2155-304    20060507.360  13.257V  ASA (ASAS Survey)
PKS2155-304    20060507.387  13.180V  ASA (ASAS Survey)
PKS2155-304    20060507.414  13.195V  ASA (ASAS Survey)
PKS2155-304    20060508.286  13.166V  ASA (ASAS Survey)
PKS2155-304    20060508.318  13.172V  ASA (ASAS Survey)
PKS2155-304    20060508.350  13.287V  ASA (ASAS Survey)
PKS2155-304    20060508.358  13.197V  ASA (ASAS Survey)
PKS2155-304    20060508.376  13.249V  ASA (ASAS Survey)
PKS2155-304    20060508.405  13.323V  ASA (ASAS Survey)
PKS2155-304    20060508.431  13.239V  ASA (ASAS Survey)
PKS2155-304    20060509.269  13.080V  ASA (ASAS Survey)
PKS2155-304    20060509.298  13.312V  ASA (ASAS Survey)
PKS2155-304    20060509.328  13.179V  ASA (ASAS Survey)
PKS2155-304    20060509.360  13.534V  ASA (ASAS Survey)
PKS2155-304    20060509.388  13.188V  ASA (ASAS Survey)
PKS2155-304    20060509.415  13.261V  ASA (ASAS Survey)
PKS2155-304    20060510.272  13.169V  ASA (ASAS Survey)
PKS2155-304    20060510.302  13.253V  ASA (ASAS Survey)
PKS2155-304    20060511.356  12.977V  ASA (ASAS Survey)
PKS2155-304    20060514.363  13.013V  ASA (ASAS Survey)
PKS2155-304    20060517.354  12.866V  ASA (ASAS Survey)
PKS2155-304    20060522.361  12.921V  ASA (ASAS Survey)
PKS2155-304    20060527.396  12.847V  ASA (ASAS Survey)

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ATEL #867							     ATEL #867

Title:		H.E.S.S. detects historically high fluxes of Very High Energy
		gamma-rays from PKS 2155-304
Author:	Wystan Benbow (Max-Planck-Institut fuer Kernphysik), Luigi
		Costamante (Max-Planck-Institut fuer Kernphysik), Berrie Giebels
(Laboratoire
		Leprince Ringuet - IN2P3/CNRS) on behalf of the H.E.S.S. (High Energy
		Stereoscopic System) collaboration
Queries:	berrie at poly.in2p3.fr
Posted:	27 Jul 2006;  15:03  UT
Subjects:	>GeV, Request for Observations, AGN

We report on the H.E.S.S. observations of the blazar PKS 2155-304 at VHE
gamma-rays (E>200 GeV) varying between ~40 and ~100% of the Crab flux.
On the night of 7/24-25 the source was seen in *preliminary* analyses
with a significance of 30   sigma/sqrt(hr), or an average 89% of HESS Crab
flux above 200 GeV. On the night of   7/25-26 the source was seen with
25 sigma/sqrt(hr) or an average of 62% Crab. On the   night of 7/27-28
the source was seen with 14 sigma/sqrt(hr) with a light   weather
degradation.
HESS will monitor PKS 2155-304 until Aug. 03, 2007. Predicted observation
windows are listed below, within which RXTE ToO observations are scheduled.
Simultaneous observations at all wavelengths are strongly encouraged.
Date Start Time(UT)  Stop Time(UT)      JUL 29 00:20:00    JUL 29
01:50:00      JUL 29 23:50:00    JUL 30 01:20:00      JUL 30 01:30:00
JUL 30 03:00:00      JUL 30 23:30:00    JUL 31 01:00:00      AUG 1 00:40:00
AUG 1 02:00:00      AUG 2 00:10:00     AUG 2 01:40:00      AUG 3 01:10:00
AUG 3 02:50:00

H.E.S.S. experiment Homepage: http://www.mpi-hd.mpg.de/hfm/HESS/HESS.html
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Password Certification:  Berrie Giebels (berrie at poly.in2p3.fr)
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