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XMM-Newton Observation of GRB011211



Events

  • On December 11, 2001, at 23:53UT, XMM-Newton SOC received a Target of Opportunity notification after the BeppoSAX detection of GRB011211.
  • This GRB was immediately approved by the XMM-Newton SOC for ToO observation. The observation was started on 2001-12-12T06:16:56Z under ObsId= 0094380101 during XMM-Newton's revolution number 0368 .
  • The initial pointing coordinates were RA = 11:15:16.4 and Dec = -21:55:44.8
  • After ~ 4 ks of photon accumulation in EPIC, a source was detected ~ 1 arcmin off the reported coordinates. This source was located so close to the edge of CCD#7 in pn that part of the PSF was falling in the inter-CCD gap. Therefore, the telescope was re-pointed to place this source at the nominal boresight location.
  • The new boresight coordinates were set to RA = 11:15:18.0 and Dec = -21:56:53.0

Important note:

  • The re-pointing was performed without stopping the integration in EPIC and RGS.
  • As a result, GRB011211 is located in two different EPIC/RGS detector positions which affects the background
    subtraction and detector response.
  • Users are informed that the re-pointing slew started at 2001-12-12T08:31:16 and finished at 2001-12-12T08:40:50.

Data

  • The Observation Data File (ODF) is available here as 0094380101.tar.gz.
  • The Pipeline Products are now also available in the ftp area. Details on the Pipeline process can be found here

Preview of pn images

Full pn image in sky (left) and detector (right) coordinates.
GRB011211 PN
 
Expanded view (in detector coordinates) around GRB011211 before (left) and after (right) re-pointing.
GRB011211 PN

Quick Look Analysis

The total count rate from GRB011211 decreased during the XMM-Newton observation by a factor of 2-3.

The lightcurve observed with pn: the data points before and after the re-pointing are coloured in black and red, respectively. Only events within 10 arcsec of the source peak have been counted for.
GRB011211 Countrate
 
The lightcurves as seen in MOS-1 and MOS-2: only events within 9.5 arcsec of the source peak have been counted for.
GRB011211 MOS1
 
GRB011211 MOS2
 
A very preliminary analysis of the pn-spectrum points to a very low absorbing column density. The pn-spectrum after the re-pointing is shown in the following figure.
GRB011211 Spec
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This page was last updated on 19 July, 2011.