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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

5051 results found.

  1. GRB 081104: refined XRT analysis
  2. Radio observation of GRB 080218b with ATCA
  3. GRB 081024B: BTA deep optical observations
  4. GRB081029: Swift XRT refined analysis
  5. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  6. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  7. GRB 081024B: Fermi Gamma-ray Burst Monitor detection
  8. Fermi-LAT observation of GRB 081024B
  9. GRB 081024: Faulkes Telescope North optical observations
  10. GRB 081022, Swift-BAT refined analysis
  11. GRB 081022: Swift detection of a burst
  12. GRB 081007: Rapid PROMPT Detections
  13. GRB081006: Fermi GBM detection
  14. GRB 081007: Early RAPTOR measurements of optical counterpart
  15. GRB 081007: Swift-XRT Team refined analysis
  16. GRB 080928: Fermi GBM detection
  17. GRB 080928: Swift-XRT refined analysis
  18. GRB 080916C: Fermi GBM Spectral Analysis
  19. GRB 080916A: Fermi GBM detection
  20. GRB 080915: Swift-XRT afterglow detection and analysis
  21. GRB 080913: GROND photo-z
  22. Swift Trigger 324116 is known source again
  23. GRB 080906: GROND observations of the optical/NIR afterglow
  24. GRB 080905A: NOT and VLT observations
  25. GRB 080903: Swift-XRT Refined Analysis
  26. Radio Detection of SGR 0501+4516: Retraction
  27. SGR 0501+4516: Decline in Activity
  28. SGR 0501+4516: Proximity to supernova remnant HB9
  29. SGR 0501+4516: Swift XRT measure of the spin period
  30. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  31. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  32. Radio Detection of SGR 0501+4516
  33. SGR 0501+4516: MDM Optical Observations
  34. SGR 0501+4516: Astrotel-Caucasus optical observations
  35. GLAST Burst Monitor detection of GRB 080818
  36. GRB 080810: RTT150 optical observations
  37. GRB 080810: Swift-XRT Team refined analysis
  38. GRB 080723B: GROND upper limits
  39. GRB 080804: GROND observations
  40. GRB080805 optical limit by "Pi of the Sky"
  41. GRB 080802: Swift-XRT Refined Analysis
  42. GRB 080727A: Early IR observations
  43. GRB 080727C: Swift XRT refined analysis
  44. GRB 080727B: Swift-XRT refined analysis
  45. GRB 080727A: Swift-XRT refined analysis
  46. GRB 080727B: Swift detection of a bright burst
  47. GRB 080723B - correction to flux conversion factor
  48. GRB 080723B - Swift-XRT refined analysis
  49. GRB 080723: Swift detection of a burst
  50. GRB 080721: Swift-XRT refined analysis
  51. GRB 080714: Swift-XRT refined analysis
  52. GRB 080603B: optical observations in MAO
  53. GRB 080710: Swift-XRT refined analysis
  54. GRB 080703: Swift-XRT refined analysis
  55. GRB 080702A: Swift-XRT Team refined analysis
  56. GRB 080701: Swift-XRT refined analysis
  57. GRB 080623: GROND upper limits
  58. GRB 080623: Swift-XRT refined analysis
  59. GRB 080613B: Swift-XRT refined analysis
  60. GRB080605: optical observation with the MITSuME-OAO telescope
  61. GRB 080605: Swift-XRT refined analysis
  62. GRB 080604: Swift-XRT refined analysis
  63. GRB 080603B: Swift-XRT refined analysis
  64. GRB 080603: Gemini-North redshift
  65. GRB 080524: Swift-BAT detection of a burst in ground analysis
  66. GRB 080523: VLT optical observations
  67. GRB 080520: Swift XRT Refined Analysis
  68. GRB 080520: Swift detection of a burst with optical afterglow
  69. GRB 080517: Swift-XRT refined analysis
  70. GRB 080517: Swift detection of a burst
  71. GRB 080516: Swift-XRT Team refined analysis
  72. GRB 080514B: KPNO 4m IR observations
  73. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  74. GRB 080506: Swift XRT refined analysis
  75. GRB080503, RIMOTS optical upper limit
  76. GRB080503 XRT refined analysis
  77. GRB 080430
  78. GRB 080430: Swift-XRT refined analysis
  79. GRB 080426: Swift-XRT refined analysis
  80. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  81. GRB 080413B: Swift XRT refined analysis
  82. GRB 080413A: Swift-XRT refined analysis
  83. GRB 080409: Swift detection of a burst
  84. GRB080328, RIMOTS optical upper limit
  85. GRB080310, late-time photometry with LBT
  86. GRB080325: XRT Refined Analysis
  87. GRB 080319D, Swift-BAT refined analysis
  88. GRB 080320: Swift XRT refined analysis
  89. GRB 080319D: Swift XRT refined analysis
  90. GRB 080320: Gemini-N optical afterglow
  91. GRB 080319B: Swift-XRT Team Refined Analysis
  92. GRB 080319C: Swift detection of a burst with an optical afterglow
  93. GRB080310: Optical observation by MITSuME telescope
  94. GRB080310: Super-LOTIS suggestion of brightening
  95. GRB 080310: Swift detection of a burst with optical afterglow
  96. GRB 080307: Swift-XRT Team refined analysis
  97. GRB 080307: Early RAPTOR Limits
  98. GRB080303: Swift XRT refined analysis
  99. GRB080229: Swift XRT refined analysis
  100. GRB080229: Possible optical afterglow

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