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VHF sequence simulation for ECLAIRs and GRM

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Presentation on theme: "VHF sequence simulation for ECLAIRs and GRM"— Presentation transcript:

1 VHF sequence simulation for ECLAIRs and GRM
SVOM-SOL meeting , Meudon Reference GRB-DC1 VHF sequence simulation for ECLAIRs and GRM Stéphane Schanne Astrophysics Department CEA Paris-Saclay / IRFU

2 GRB-DC1: A reference GRB for DC1
Propose a simulated VHF Alert Sequence (as it could come out of UGTS) Used for system tests (PDPU, VHF-NETWORK) with CNES Data content Alert packets with S/C attitude Burst localizations (in ECL FoV, in Theta/Phi) Slew request Light curves with counts to be analysed by LUPM/IAP Light curves with spacecraft attitude during slew Shadowgram / Sub-image to test our VHF ground processing Input: CNES satellite attitude quaternion before and after slew Compute Burst position in FoV before slew (using USSB) Generate Burst positions in Alert packets before slew (we chose to have 7 Alert packets from UGTS, first alert T0+0 s, alert with slew request at T0+30 s) [2] S. Schanne – Ref GRB-DC1 - ECLAIRs and GRM VHF sequence simulation /07/03

3 GRB-DC1: VHF Alert Sequence ECL Timing
7 Alert Messages (NAlertCount = NAC = 0 to 6) Last one with SLEW request (+ immediate SLEW start) SLEW start at MJD = SLEW end at MJD =  Slew duration: 89 s T0 of the GRB (1st detection): 30 seconds before the SLEW Alert Light Curve (HP + LP) produced after first Alert Message (T0, NAC=0) Alert Descriptor + Shadowgram produced after SLEW start (NAC=6) NAC= (NAlertCount) [3] S. Schanne – Ref GRB-DC1 - ECLAIRs and GRM VHF sequence simulation /07/03 SLEW T s Alert Light Curve HP Alert Light Curve LP Alert Descr. Alert Shadowgram Recurrent messages CNES input: Time (MJD) quaternionEQUf obsType obsGP obsGRB

4 GRB-DC1: VHF Alert Sequence ECL output timing
Hypothesis: UGTS output 1 VHF packet/s Total of 150 packets generated (number 0 to 149) ECLAIRs Time of packet generation (offset from T0 in s) Time of data in packet (offset from T0 in s) Priority of packet (0-5, equal to type of pkt) [4] S. Schanne – Ref GRB-DC1 - ECLAIRs and GRM VHF sequence simulation /07/03 number of packet in VHF sequence Type Recur Alert Descr LcHp LcLp Shadowgr Priority 1 2 3 4 5 Amount 1/30s 7 22 40 64 Time first pkt 32 13 65 Time last pkt 30 36 57 404 133

5 GRB-DC1: VHF Alert Sequence GRM output timing
Hypothesis: GRM output 1 VHF packet/s No GRM trigger, send only: Recur, LcHp, LcLp Total of 79 packets generated (number 0 to 78) GRM Time of packet generation (offset from T0 in s) Time of data in packet (offset from T0 in s) Priority of packet (0-5, equal to type of pkt) [5] S. Schanne – Ref GRB-DC1 - ECLAIRs and GRM VHF sequence simulation /07/03 number of packet in VHF sequence Type Recur LcHp LcLp Priority 1 2 Amount 1/30s 22 42 Time first pkt 23 Time last pkt 404

6 GRB-DC1: VHF Alert Seq. VHF-NETWORK output
GRMLCURHIP GRMLCURLOP ECLLCURHP1 ECLSUBIMAG ECLALERTL1 ECLALDESC1 ECLLCURLP1 MXTPOSITIO ECL and GRM output  CNES system simulation of VHF network Florian REINER ECLALERTL1 first ECLLCURHP1 first ECLALERTL1 last GRMLCURHIP first ECLLCURHP1 last GRMLCURHIP last ECLALDESC1 first ECLALDESC5 last ECLLCURLP1 first GRMLCURLOP first ECLSUBIMAG first MXTPOSITIO first ECLLCURLP1 last GRMLCURLOP ECLSUBIMAG last … Time since 1st Alert Pkt reception (s) 6 28 56 58 100 102 110 112 178 256 290 412 414 446 [6] S. Schanne – Ref GRB-DC1 - ECLAIRs and GRM VHF sequence simulation /07/03 SLEW

7 GRB-DC1: Alert Sequence Positions
NAC=0 ALRT Isky,Jsky= ,57.81 IJskyErr= 0.94 theta,phi = 26.75,34.78 NAC= 1 ALRT Isky,Jsky= ,57.81 IJskyErr= 0.74 theta,phi = 26.67,34.47 NAC= 2 ALRT Isky,Jsky= ,57.48 IJskyErr= 0.74 theta,phi = 26.87,34.57 NAC= 3 ALRT Isky,Jsky= IJskyErr= 0.66 theta,phi = 26.58,34.16 NAC= 4 ALRT Isky,Jsky= ,57.15 IJskyErr= 0.66 theta,phi = 27.00,34.36 NAC= 5 ALRT Isky,Jsky= ,57.48 IJskyErr= 0.47 theta,phi = 26.79,34.26 NAC= 6 ALRT SLEW Isky,Jsky= ,57.48 IJskyErr= 0.33 theta,phi = 26.71,33.95 NAC= 7 TRUE Isky,Jsky= ,57.15 IJskyErr= 0.0 theta,phi = 26.83,33.75 Jsky ( = - Ysky ) 3 1 6 5 2 [7] S. Schanne – Ref GRB-DC1 - ECLAIRs and GRM VHF sequence simulation /07/03 SLEW target 0.33 pixel = 9.3 arcmin 7 4 TRUE position Isky ( = Zsky ) Isky,Jsky= , pix theta,phi = 26.83°, 33.75° (CAMf)

8 GRB-DC1: ECLAIRs FoV with Earth around slew
Time (MJD) steps of 1 min Jsky ( = - Ysky ) slewing [8] S. Schanne – Ref GRB-DC1 - ECLAIRs and GRM VHF sequence simulation /07/03 Isky ( = Zsky ) GRB ra,dec= 51.86°,46.81° (EQUf) Isky,Jsky= , pix theta,phi = 26.83°, 33.75° (CAMf) Isky,Jsky= , pix theta,phi = °, 7.856° (CAMf)

9 GRB-DC1: ECLAIRs FoV in EQUf
In equatorial coordinates (EQUf) X = optical axis blue = Iaxis (Zaxis) red = Jaxis (-Yaxis) [9] S. Schanne – Ref GRB-DC1 - ECLAIRs and GRM VHF sequence simulation /07/03 N. Dagoneau ECLAIRs Coding Fraction

10 GRB-DC1: ECLAIRs FoV in GALf
In galactic coordinates (GALf) X = optical axis blue = Iaxis (Zaxis) red = Jaxis (-Yaxis) [10] S. Schanne – Ref GRB-DC1 - ECLAIRs and GRM VHF sequence simulation /07/03 Crab Cas A N. Dagoneau ECLAIRs Coding Fraction

11 GRB-DC1: GRB position on the night sky
Les Houches 2020/3/15 [11] S. Schanne – Ref GRB-DC1 - ECLAIRs and GRM VHF sequence simulation /07/03 N. Dagoneau

12 GRB-DC1: GRB position observability
Les Houches 2020/3/15 [12] S. Schanne – Ref GRB-DC1 - ECLAIRs and GRM VHF sequence simulation /07/03 N. Dagoneau

13 CEA Work Package on VHF ground processing
SVOM-SOL meeting , Meudon CEA Work Package on VHF ground processing Stéphane Schanne Astrophysics Department CEA Paris-Saclay / IRFU

14 Philo: CEA VHF ground processing code
CEA has Work Pacakges for VHF ground processing Alert Packets, Alert Descriptor ECL VHF LC, GRM VHF LC Shadowgram, Subimage, Recurrent messages To run at FSC inside one container using python scripts and UGTS Scientific Software Bricks (USSB) in C++ Processing Philo for each VHF LC packet: relaunch OBLC processing for the complete Alert sequence with all VHF LC packets available up to now refresh display for burst advocate generate the fits file for further analysis (link on browser) Decide the sequence is over (all packets there or Time-out?)  hand-over to Science Database and initiate LC analysis (LUPM/IAP) Same Philo for other packet types (Shadowgram, Subimage, …) analysis redone every packet (with partial VHF packet sequence) [14] S. Schanne – Ref GRB-DC1 - ECLAIRs and GRM VHF sequence simulation /07/03

15 ECL VHF-LC: Light Curve Reconstruction with holes
Generated list of VHF light curve packets (jason file) Removed some packets from the list and change order of packets New light curve reconstruction program (in python) capable of: sorting reconstructing missing packets (using the incremental light curve format) performing display (in counts/sample vs sample or in counts/s vs time) saving fits file Sample 4-7 missing (1 pkt) Sample 44-51 missing (2 pkts) [15] S. Schanne – Ref GRB-DC1 - ECLAIRs and GRM VHF sequence simulation /07/03 LowRes (LcLp) MidRes (LcHp) HiRes (LcLp)

16 ECL VHF-LC: Light Curve Reconstruction with holes
Generated list of VHF light curve packets (jason file) Removed some packets from the list and change order of packets New light curve reconstruction program (in python) capable of: sorting reconstructing missing packets (using the incremental light curve format) performing display (in counts/sample vs sample or in counts/s vs time) saving fits file Sample 4-7 missing (1 pkt) Sample 44-51 missing (2 pkts) [16] S. Schanne – Ref GRB-DC1 - ECLAIRs and GRM VHF sequence simulation /07/03 LowRes (LcLp) MidRes (LcHp) HiRes (LcLp)

17 ECL VHF-LC: Light Curve Reconstruction with holes
Generated list of VHF light curve packets (jason file) Removed some packets from the list and change order of packets New light curve reconstruction program (in python) capable of: sorting reconstructing missing packets (using the incremental light curve format) performing display (in counts/sample vs sample or in counts/s vs time) saving fits file [17] S. Schanne – Ref GRB-DC1 - ECLAIRs and GRM VHF sequence simulation /07/03

18 Philo: CEA VHF ground processing status
Reconstruction of VHF light curve: done for ECL and GRM Handling of missing packets (by using incremental packet format) Writing OBLC into ordered fits files TBD: interaction with database Reconstruction of Shadowgram and SubImage TBD: coud be our coding task for DC1. Partial Shadowgram can be deconvolved with USSB: (give weight=0 to missing portions of detector plane),  sky reconstruction, peak finding, fitting, source localization Partial Sub-Image can be analysed wiht USSB: (give weight=0 to missing portions of the sky),  peak finding, fitting, source localization S. Schanne  T. Sadibekova T. Sadibekova/S. Schanne [18] S. Schanne – Ref GRB-DC1 - ECLAIRs and GRM VHF sequence simulation /07/03

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