Please find attached our phaseII submission for "Constraining the late time lightcurve and energy of GRB 090102". ----- Attempting Submission 1 (Fri Jan 16 10:35:22 GMT 2009) ----- Constraining the late time lightcurve and energy of GRB 090102 We propose to conduct a series of late time observations of the lightcurve of the bright gamma-ray burst GRB 090102. Declared a burst of interest by the Swift team, and with excellent broadband data covering the prompt emission (Swift and Fermi) and afterglow (Swift, TAROT, NOT, WHT, and several more), GRB 090102 offers a rare opportunity to probe the physics and energetics of GRBs. Its high energy budget (>2e53 ergs for isotropic emission) stretches plausible progenitor models, and as yet the signatures of jet-like emission have not been observed. Our late time observations will search for steepening of the afterglow due to lateral expansion of the jet. This will enable us, in tandem with the data already secured, to determine its total energy budget, and compare this to expectations for different progenitors models. HST is vital to this endeavour since it can reach depths essentially unattainable to ground based technology, while its invariant PSF will allow us to accurately remove underlying host contamination. Ultimately, the range and quality of data secured for this burst will enable us to accurately reconstruct the parameters of the explosion, and shed greater light on the physical processes which underly the production of GRBs.
We propose to observe GRB 090102 at 3 epochs using WFPC2 (and ACS/WFC3 if the final epoch takes place after SM4). We will perform 3 orbit observations at each epoch utlizing the F606W filter. Our first observations should take place in the current visiblity window, which expires on the 27 Jan (this is visit1). A second set of observations (identical to the first) should take place in a second window at the end of Feb (visit 2). The final observations will aim to constrain the host galaxy contribution and can take place at a later date (in 2-gyro mode visiblity is open again at the end of Sept 09, but this will obviously be different in 3-gyro mode post SM4). COSMOLOGY 0 false 0.0 0.0 false false false false false SUPPORTED GALAXY HIGH REDSHIFT GALAXY J2000 08 32 58.5400 +33 06 51.10 J2000 WFPC2 Imaging No F606W WFPC2 Imaging No F606W WFPC2 Imaging No F606W The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. /private/tmp/OPVisit5260.xml (Tic-Visit :proposal-id 11991 :visit-id "01" :proposal-version -1 :trans-version "20080807" :date "16-Jan-2009 10:23:12.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "26" :si-bright-earth-limb-angle 20.0 :data-volume 313712 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11991 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11991 :visit-id "01" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2600 :al-overhead-at-end 160 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3152 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11991 :visit-id "01" :orbit-number 2 :pcs-time 355 :si-vis-utilization 2720 :al-overhead-at-end 160 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3152 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11991 :visit-id "01" :orbit-number 3 :pcs-time 355 :si-vis-utilization 2700 :al-overhead-at-end 180 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3152 :pcs-gap 0 ) true 3 0 The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. /private/tmp/OPVisit5261.xml (Tic-Visit :proposal-id 11991 :visit-id "02" :proposal-version -1 :trans-version "20080807" :date "16-Jan-2009 10:23:13.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "26" :si-bright-earth-limb-angle 20.0 :data-volume 268896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11991 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11991 :visit-id "02" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2720 :al-overhead-at-end 160 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3152 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11991 :visit-id "02" :orbit-number 2 :pcs-time 355 :si-vis-utilization 2720 :al-overhead-at-end 160 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3152 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11991 :visit-id "02" :orbit-number 3 :pcs-time 355 :si-vis-utilization 2700 :al-overhead-at-end 180 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3152 :pcs-gap 0 ) true 3 0