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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

24584 results found.

  1. LIGO/Virgo G298048: VLA Refined Analysis
  2. LIGO/Virgo G298048: MASTER observations of the NGC 4993
  3. LIGO/Virgo G298048: VLA Detection
  4. LIGO/Virgo G298048: Galaxy-Targeted Optical Followup With Las Cumbres Observatory
  5. GRB 170817B: Fermi GBM detection
  6. LIGO/Virgo G298048: DLT40 follow-up observation
  7. LIGO/Virgo G298048: Inspection of archival HST data at the position of the potential optical counterpart
  8. LIGO/Virgo G298048: Nearby Galaxies in the Localization Volume using the updated sky map computed using LALInference
  9. LIGO/Virgo G298048 : Fermi-LAT search for a high-energy gamma-ray counterpart
  10. LIGO/Virgo G298048: DECam optical candidate
  11. LIGO/Virgo G298048: Potential optical counterpart discovered by Swope telescope
  12. LIGO/Virgo G298048 - Update on Fermi/GBM GRB 170817A Analysis
  13. LIGO/Virgo G298048: AGILE GRID observations
  14. LIGO/Virgo G298048: AGILE MCAL observations
  15. LIGO/Virgo G298048: Swift/BAT data search
  16. LIGO/Virgo G297595: Pierre Auger Observatory neutrino follow-up
  17. LIGO/Virgo G298048 ANTARES search
  18. LIGO/Virgo G298048: Nearby Galaxies in the Localization Volume with Face-on Assumption
  19. GRB 170817A: Fermi GBM detection
  20. LIGO/Virgo G298048: Nearby Galaxies in the Localization Volume
  21. LIGO/Virgo G298048: Insight-HXMT observations
  22. IPN Triangulation of GRB 170816A (short/hard)
  23. LIGO/Virgo G298048: Astrosat CZTI upper limits
  24. LIGO/Virgo G298048: Further analysis of a binary neutron star candidate with updated sky localization
  25. LIGO/Virgo G298048: COINCIDENT IceCube neutrino candidate with Fermi GBM trigger 524666471/170817529
  26. LIGO/Virgo G298048: correction to the luminosity distance reported in GCN 21509
  27. LIGO/Virgo G298048: Identification of a binary neutron star candidate coincident with Fermi GBM trigger 524666471/170817529
  28. LIGO/Virgo G298048: FOUND COINCIDENT IceCube neutrino observation
  29. LIGO/Virgo G298048: INTEGRAL detection of a prompt gamma-ray counterpart
  30. LIGO/Virgo G298048: Fermi GBM trigger 170817.529 and LIGO single IFO trigger
  31. LIGO/Virgo G298048: Fermi GBM trigger 524666471/170817529: LIGO/Virgo Identification of a possible gravitational-wave counterpart
  32. GRB 170816A: Fermi GBM detection
  33. LIGO/Virgo G297595: Konus-Wind observations
  34. LIGO/Virgo G297595: INAF VST-ESO PARANAL observations
  35. LIGO/Virgo G297595: Subaru Hyper Suprime-Cam follow-up observations
  36. LIGO/Virgo G296853: Pierre Auger Observatory neutrino follow-up
  37. LIGO/Virgo G297595 : MAXI/GSC observations
  38. LIGO/Virgo G297595: Updated localization from LIGO and Virgo data
  39. GRB 170813A: Fermi GBM observation
  40. LIGO/Virgo G297595: Correction to luminosity distance stated in GCN 21474
  41. LIGO/Virgo G297595: Pan-STARRS coverage and transients over the first 5hrs
  42. LIGO/Virgo G297595: Insight-HXMT observations
  43. LIGO/Virgo G297595: Nearby Galaxies in the Localization Volume
  44. LIGO/Virgo G297595: Fermi GBM Observations
  45. LIGO/Virgo G297595: Swift/BAT data search
  46. LIGO/Virgo G297595: AGILE GRID observations
  47. LIGO/Virgo G297595 : Fermi-LAT search for high-energy gamma-ray counterpart
  48. LIGO/Virgo G297595 ANTARES search
  49. LIGO/Virgo G297595: INTEGRAL search for a prompt gamma-ray counterpart
  50. LIGO/Virgo G297595: AGILE MCAL observations
  51. LIGO/Virgo G297595: SPI-ACS/INTEGRAL data investigations
  52. LIGO/Virgo G297595: IceCube neutrino observations
  53. LIGO/Virgo G297595: Identification of a GW Binary Merger Candidate
  54. GRB 170813A: Swift-BAT refined analysis
  55. GRB 170810A: Swift-BAT refined analysis
  56. LIGO/Virgo G296853: Insight-HXMT observations
  57. LIGO/Virgo G296853 : MAXI/GSC observations
  58. GRB 170810A: Swift-XRT refined Analysis
  59. GRB 170810A: Fermi GBM observation
  60. GRB 170810A: Fermi-LAT detection
  61. GRB 170810A: Swift detection of a burst with a bright optical counterpart
  62. GRB 170810A: MASTER-NET very bright OT detection
  63. LIGO/Virgo G296853: HAWC follow-up
  64. Konus-Wind observation of GRB 170808B
  65. LIGO/Virgo G296853: Super-AGILE observations
  66. GRB 170803B: Insight-HXMT detection
  67. Konus-Wind observation of GRB 170805B
  68. LIGO/Virgo G296853: no INTEGRAL data at the time of the event
  69. LIGO/Virgo G296853: Fermi-LAT search for high-energy gamma-ray counterpart
  70. LIGO/Virgo G296853: Fermi GBM Observations
  71. LIGO/Virgo G296853: AGILE GRID observations
  72. LIGO/Virgo G296853: Swift/BAT data search
  73. LIGO/Virgo G296853: MASTER follow up observations
  74. LIGO/Virgo G296853: AGILE MCAL observations
  75. LIGO/Virgo G296853 ANTARES search
  76. LIGO/Virgo G296853: IceCube neutrino observations
  77. LIGO/Virgo G296853: Identification of a GW Binary Merger Candidate
  78. GRB 170808B: Fermi LAT Detection
  79. GRB 170808B: Fermi GBM observation
  80. IPN Triangulation of GRB 170805B (short/hard)
  81. GRB 170801A: Insight-HXMT detection
  82. Konus-Wind observation of GRB 170724A
  83. GRB 170807A: Swift-BAT refined analysis
  84. GRB 170807A: Swift detection of a burst
  85. GRB 170804A: Swift-BAT refined analysis
  86. GRB 170803A: Swift-BAT refined analysis
  87. GRB 170804A: Swift detection of a burst with optical counterpart
  88. GRB 170803A: Swift-XRT refined Analysis
  89. GRB 170803A: Fermi GBM observation
  90. GRB 170802A: Fermi GBM detection
  91. Swift Trigger 765783 is not an astrophysical event.
  92. GRB 170728B: time correction to MASTER GCN Circular 21391
  93. Swift J181723.1-164300: Swift detection of another pulse of the new Galactic source
  94. Konus-Wind observation of GRB 170728B
  95. GRB 170726A: AstroSat CZTI detection
  96. GRB 170714A: Chandra observations
  97. GRB 170728B: Optical observations at Crni Vrh
  98. GRB 170728B: BOOTES-2/TELMA optical detection during the extended gamma-ray phase
  99. GRB170730A detecetd by INTEGRAL. Refined analysis
  100. GRB 170728B: MASTER-IAC first minute short GRB early OT detection

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