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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"

24596 results found.

  1. GRB 180626A: KAIT Optical Upper Limit
  2. GRB 180624A: LCO Haleakala observations
  3. Konus-Wind observation of GRB 180623A
  4. GRB 180626A: LCO Haleakala observations
  5. GRB 180626A: A long GRB detected by INTEGRAL
  6. GRB 180623B: CALET Gamma-Ray Burst Monitor detection
  7. GRB 180624A: Swift-BAT refined analysis
  8. AT2018cow: Swift/BAT data search
  9. GRB 180624A: GROND observations
  10. GRB 180624A: LCO Siding Springs afterglow candidate
  11. GRB 180624A: MITSuME Okayama optical upper limits
  12. GRB 180624A: Swift-XRT refined Analysis
  13. GRB 180623A: Swift-BAT refined analysis
  14. GRB 180623A: Swift-XRT refined Analysis
  15. Konus-Wind observation of GRB 180620B
  16. Konus-Wind observation of GRB 180620A
  17. GRB 180620B: VLT/X-shooter redshift
  18. Konus-Wind observation of GRB 180618A (a short GRB with extended emission)
  19. GRB 180620B: Swift-BAT refined analysis
  20. GRB 180613A: Afterglow confirmation and added photometry
  21. GROND observations of GRB 180620B
  22. GROND observations of GRB 180620A
  23. GRB 180620B: Swift-XRT refined Analysis
  24. GRB 180618B: CALET Gamma-Ray Burst Monitor detection
  25. GRB 180620A: Swift-BAT refined analysis
  26. GRB 180620B: Fermi GBM detection
  27. GRB 180620A: KAIT Optical Observations
  28. GRB 180620A: Swift-XRT refined Analysis
  29. GRB 180620A: LCO McDonald observations
  30. GRB 180620A: MASTER OT observation
  31. GRB 180618A: MASTER OT observation (a short GRB with extended emission)
  32. GRB 180618A: Swift-BAT refined analysis (a short GRB with extended emission)
  33. GRB 180618A: Fermi GBM detection
  34. GRB 180618A: LT prompt observations
  35. GRB 180614A: 1.5m OSN I-band observation
  36. GRB 180614A: Swift-BAT refined analysis
  37. GRB 180614A: MASTER observation
  38. GRB 180614A: Swift detection of a burst
  39. Konus-Wind observation of GRB 180611A
  40. GRB 180611A: Fermi GBM observation
  41. IPN Triangulation of GRB 180611A (long)
  42. GRB 180605A: Fermi GBM observation
  43. IPN Triangulation of GRB 180605A (long)
  44. GRB 180602A: MITSuME Ishigakijima optical upper limits
  45. GRB 180602B: Fermi GBM detection
  46. GRB 180602A: MITSuME Akeno optical upper limits
  47. GRB 180602A: Swift-XRT refined Analysis
  48. GRB 180602A: Swift-BAT refined analysis
  49. GRB 180602A: MITSuME Okayama optical upper limits
  50. GRB 180602A: Swift detection of a burst
  51. Konus-Wind observation of GRB 180529A
  52. GRB 180529A: CALET Gamma-Ray Burst Monitor detection
  53. IPN Triangulation of GRB 180529A (short/hard)
  54. Swift Trigger 834937 is not a GRB
  55. Konus-Wind observation of GRB 180526A
  56. IPN Triangulation of GRB 180526A (long)
  57. GRB 180526A: CALET Gamma-Ray Burst Monitor detection
  58. Konus-Wind observation of GRB 180523A
  59. IPN Triangulation of GRB 180523A
  60. GRB180523B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 548793993)
  61. GRB 180514A: MITSuME Ishigakijima optical upper limits
  62. GRB 180514A: MITSuME Akeno optical upper limits
  63. GRB 180510A: MITSuME Ishigakijima optical upper limits
  64. GRB 180514A: 1.5m OSN optical observations
  65. GRB 180514A: GOTO Optical Observations
  66. GRB 180514A: Swift-BAT refined analysis
  67. GRB 180512A: VLT/HAWK-I NIR Observations
  68. GRB 180514A: Swift detection of a burst
  69. Konus-Wind observation of GRB 180510A
  70. GRB 180512A: Swift-BAT refined analysis
  71. GRB 180512A: LT prompt observations
  72. GRB 180512A: GROND upper limits
  73. GRB 180512A: Swift detection of a burst
  74. GRB 180510A: Swift-XRT refined Analysis
  75. GRB 180510B: Swift-BAT refined analysis
  76. Swift Trigger 831888: a possible GRB or Galactic transient
  77. GRB 180510A: Swift detection of a burst
  78. Chandra observations of GW170817 260 days since merger: first statistically significant evidence for an X-ray decay
  79. GRB 180504A: Swift-BAT refined analysis
  80. GRB 180505A: Fermi GBM detection
  81. GRB 180504A: NOT afterglow candidate
  82. GRB 180416B: AstroSat CZTI detection
  83. Konus-Wind observation of GRB 180427A
  84. IPN Triangulation of GRB 180427A
  85. GRB 180427A: Fermi GBM detection
  86. GRB 180425A: Swift-BAT refined analysis
  87. GRB 180418A: MITSuME Ishigakijima Optical Observation
  88. Retraction of IceCube GCN/AMON NOTICE 71165249_130949
  89. GRB 180418A: Further GROND observations
  90. GRB 180418A: Xinglong TNT optical upper limit
  91. GRB 180418A: NOT optical observations
  92. GRB 180418A: Gemini-North imaging and spectroscopy
  93. GRB 180418A: Swift-BAT refined analysis
  94. GRB 180418A: Fermi GBM observation
  95. GRB 180416B: CALET Gamma-Ray Burst Monitor detection
  96. LIGO/Virgo G299232: LOFAR follow-up
  97. GRB 180418A: Swift-XRT observations
  98. GRB 180418A: LCO FTN afterglow confirmation
  99. GRB 180418A: KAIT Optical Afterglow Candidate
  100. GRB 180418A: Swift detection of a short burst

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