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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"
  1. LIGO/Virgo S190426c: NICER X-ray Follow-Up of ZTF19aassfws
  2. LIGO/Virgo S190518bb: Retraction of GW compact binary merger candidate
  3. LIGO/Virgo S190518bb Global MASTER-Net observations report
  4. LIGO/Virgo S190517h: INTEGRAL prompt observation
  5. Fermi GRB190517.81 Global MASTER-Net observations report
  6. GRB 190511A: Swift/UVOT further analysis
  7. Fermi Trigger 579814215 / GRB 190517813 / GRB190517A: BALROG localization
  8. GRB 190517A: Fermi GBM Final Real-time Localization
  9. LIGO/Virgo S190512at: Updated sky localization
  10. LIGO/Virgo S190517h: Fermi-LAT search for a high-energy gamma-ray counterpart
  11. LIGO/Virgo S190517h: Swift/BAT Counterpart Search
  12. LIGO/Virgo S190517h: ANTARES neutrino search
  13. LIGO/Virgo S190517h: Insight-HXMT/HE observations
  14. LIGO/Virgo S190517h: Fermi GBM Observations
  15. LIGO/Virgo S190517h: HAWC follow-up
  16. LIGO/Virgo S190517h: MAXI/GSC Observations
  17. LIGO/Virgo S190517h Global MASTER-Net observations report
  18. GRB 190515A: CALET Gamma-Ray Burst Monitor detection
  19. LIGO-Virgo S190517h: AGILE GRID observations
  20. LIGO/Virgo S190517h: IceCube Neutrino Search
  21. LIGO/Virgo S190517h: AGILE MCAL observations
  22. LIGO/Virgo S190517h: INTEGRAL/SPI-ACS prompt observation
  23. LIGO/Virgo S190517h: Identification of a GW compact binary merger candidate
  24. Fermi GRB190517.1 Global MASTER-Net observations report
  25. GRB 190515B: Swift/UVOT Upper Limits
  26. GRB 190515B: BOOTES-4/MET and 2.2m CAHA optical limits
  27. LIGO/Virgo S190513bm: Swope follow-up observations
  28. Fermi GRB190515.49 Global MASTER-Net observations report
  29. GRB 190515B: Swift-BAT refined analysis
  30. GRB 190515A: Insight-HXMT/HE detection
  31. GRB 190515A: Fermi GBM detection
  32. GRB 190515B: Swift-XRT refined Analysis
  33. GRB 190515A: Fermi-LAT detection
  34. Fermi GRB190515.43 Global MASTER-Net observations report
  35. GRB 190515B: Optical observations from OSN
  36. GRB 190515B: Enhanced Swift-XRT position
  37. GRB 190515B: Kitab Observatory optical upper limit
  38. Correction to GRB name for Swift trigger 903845
  39. GRB 190515B: Prompt enhanced Swift-XRT position
  40. GRB 190515B: Swift detection of a burst
  41. GRB 190510A: CALET Gamma-Ray Burst Monitor detection
  42. LIGO/Virgo S190426c: AMI-LA radio observations of ZTF19aassfws
  43. GRB 190515A: Fermi GBM Final Real-time Localization
  44. LIGO/Virgo S190513bm : TAROT-Calern and TAROT-Chile (TCA/TCH)/GRANDMA observation report.
  45. LIGO/Virgo S190513bm: CALET Observations
  46. Fermi GRB190514.67 Global MASTER-Net observations report
  47. LIGO/Virgo S190513bm: Lick/KAIT Follow-Up Observations
  48. LIGO/Virgo S190503bf: Gaia Photometric Alerts transient candidate
  49. LIGO/Virgo S190510g: Gaia Photometric Alerts transient candidate
  50. LIGO/Virgo S190513bm: Swift/BAT Counterpart Search
  51. LIGO/Virgo S190513bm: Insight-HXMT/HE observation
  52. LIGO/Virgo S190510g: Swift-XRT observations and results
  53. LIGO/Virgo S190510g: DECam-GROWTH optical counterpart candidate DG19qcso
  54. LIGO/Virgo S190513bm: ANTARES neutrino search
  55. GRB 190510B: AstroSat CZTI detection
  56. LIGO/Virgo S190513bm: Fermi GBM Observations
  57. GRB 180416D: AstroSat CZTI detection
  58. LIGO/Virgo S190510g: AT2019ezb and AT2019far 10.4m GTC spectroscopy
  59. Konus-Wind observation of GRB 190511A
  60. Konus-Wind observation of GRB 190510A
  61. LIGO/Virgo S190513bm: Fermi-LAT search for a high-energy gamma-ray counterpart
  62. LIGO/Virgo S190512at: CALET Observations
  63. LIGO/Virgo S190513bm: MAXI/GSC Observations
  64. LIGO/Virgo S190510g: Further KMTNet observation of DECam-GROWTH and DESGW candidates
  65. LIGO/Virgo S190513bm: AGILE GRID observations
  66. LIGO/Virgo S190513bm: INTEGRAL prompt observation
  67. LIGO/Virgo S190513bm: AGILE MCAL observation
  68. LIGO/Virgo S190513bm Global MASTER-Net observations report
  69. LIGO/Virgo S190513bm: IceCube Neutrino Search
  70. LIGO/Virgo S190513bm: HAWC follow-up
  71. LIGO/Virgo S190513bm: Identification of a GW compact binary merger candidate
  72. LIGO/Virgo S190512at: Insight-HXMT/HE observation
  73. GRB 190512A: Swift-BAT refined analysis
  74. LIGO-Virgo S190512at: AGILE GRID observations
  75. LIGO/Virgo S190512at: Swift/BAT Counterpart Search
  76. LIGO/Virgo S190510g: Pan-STARRS and ATLAS observations and candidates
  77. LIGO/Virgo S190512at: ANTARES neutrino search
  78. LIGO/Virgo S190512at: Fermi-LAT search for a high-energy gamma-ray counterpart
  79. LIGO/Virgo S190512at: MAXI/GSC Observations
  80. LIGO/Virgo S190512at: Fermi GBM Observations
  81. LIGO/Virgo S190512at Global MASTER-Net observations report
  82. LIGO/Virgo S190510g: Spectroscopic Classification of DECam-GROWTH and DES-GW Candidate DG19fqqk/desgw-190510c with Magellan
  83. GRB 190512A: Fermi GBM observation
  84. LIGO/Virgo S190510g: MASTER OT detection inside PGC087378 galaxy
  85. LIGO/Virgo S190512at: INTEGRAL inactive at the time of the event
  86. LIGO-Virgo S190512at: AGILE MCAL observations
  87. Fermi GRB190512.62 Global MASTER-Net observations report
  88. Fermi GRB190512.61 Global MASTER-Net observations report
  89. LIGO/Virgo S190512at: IceCube Neutrino Search
  90. LIGO/Virgo S190512at: Identification of a GW compact binary merger candidate
  91. GRB 190511A: Swift-BAT refined analysis
  92. GRB 190512A: Swift detection of a burst
  93. GRB 190512A: Fermi GBM Final Real-time Localization
  94. GRB 190511A: Swift-XRT refined Analysis
  95. IPN triangulation of GRB 190510A (short)
  96. LIGO/Virgo S190510g: DOAO Observation
  97. LIGO/Virgo S190510g: CALET Observations
  98. GRB 190511A: Swift/UVOT Detection
  99. LIGO/Virgo S190510g: KMTNet observation of DECam-GROWTH and DESGW candidates
  100. GRB 190511A: NOT optical afterglow

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