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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"

8294 results found.

  1. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  2. GRB 080613B, Swift-BAT refined analysis
  3. GRB 080613B: Swift detection of a burst
  4. GRB 080613: Faulkes Telescope North optical candidate
  5. Swift observations of BAT Slew Survey event (Trigger=010)
  6. GRB 080603A: final Swift-XRT observations.
  7. GRB 080607: AGILE-MCAL observation of the prompt emission
  8. GRB 080607: Swift detection of a burst with optical afterglow
  9. GRB 080607: ROTSE-III Detection of Optical Counterpart
  10. GRB 080605: GROND detection of the optical afterglow candidate
  11. GRB 080605: Liverpool Telescope optical afterglow candidate
  12. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  13. GRB 080603A: Swift-XRT detection of the afterglow
  14. GRB 080604: Swift detection of a burst with an optical afterglow
  15. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  16. GRB 080603B: Swift detection of a burst with optical afterglow
  17. GRB 080603: Gemini-North redshift
  18. GRB 080603 OA candidate
  19. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  20. GRB 080602: Swift detection of a burst
  21. Konus-Wind observation of reactivation of SGR 1627-41
  22. GRB 080523, Swift-BAT refined analysis
  23. GRB 080523: Swift detection of a burst
  24. GRB 080520, GROND observations
  25. GRB 080520: Swift detection of a burst with optical afterglow
  26. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  27. GRB 080517, Swift-BAT refined analysis
  28. GRB 080516: Swift detection of a burst
  29. GRB 080514B : redshift estimation
  30. GRB 080514B, GROND observations
  31. GRB 080514B: Finding chart
  32. GRB 080514B: Afterglow candidate
  33. Swift detection of a possible galactic transient
  34. GRB 080507: E Pur Si Muove!
  35. GRB080507: Swift/UVOT followup observations
  36. GRB 080506: Swift detection of a burst with optical afterglow
  37. GRB 080503: MITSuME Ishigakijima optical upper limits
  38. GRB 080503: MITSuME Akeno optical upper limits
  39. GRB 080503: New candidate afterglow/host in Gemini imaging
  40. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  41. GRB 080503: Swift detection of a short burst
  42. GRB 080430: Swift detection of a burst with optical afterglow
  43. GRB 080426: Swift detection of a possibly short burst
  44. GRB 080420?: Swift detection of a possible short burst
  45. GRB 080413B: Swift XRT refined analysis
  46. GRB 080413B, Swift-BAT refined analysis
  47. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  48. GRB 080413A: REM detection of the NIR Afterglow
  49. GRB 080413: TAROT Calern observatory optical observations
  50. GRB 080413: Swift detection of a burst with an optical afterglow
  51. GRB 080413: ROTSE-III Detection of Optical Counterpart
  52. GRB 080411: GROND detection of optical afterglow candidate
  53. GRB 080408: GROND detection of optical/NIR afterglow candidate
  54. GRB 080409: Swift detection of a burst
  55. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  56. GRB 080330: Liverpool Telescope Optical observations
  57. GRB 080330: Swift detection of a burst with an optical counterpart
  58. GRB 080330: TAROT Calern observatory optical detection
  59. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  60. GRB 080325, Swift-BAT refined analysis
  61. GRB080325 - I and z-band Imaging
  62. GRB 080328: Swift detection of a burst with an optical counterpart
  63. GRB 080325: Subaru detection of NIR afterglow candidate
  64. GRB 080325: MITSuME Akeno optical upper limits
  65. GRB 080325: GROND Observations
  66. GRB 080325: Swift/UVOT Upper Limits
  67. GRB 080325: NIR afterglow candidate
  68. GRB 080325: Swift detection of a burst
  69. GRB 080319B: Second & Third Epoch WSRT Radio Observations
  70. GRB 080319D: optical upper limit
  71. GRB 080320: Early Super-LOTIS Observations
  72. GRB 080319C, Swift-BAT refined analysis
  73. GRB 080319B: WSRT Radio Observations
  74. GRB 080320: Swift detection of a burst
  75. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  76. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  77. GRB 080319A, Swift-BAT refined analysis
  78. GRB 080319C: Swift detection of a burst with an optical afterglow
  79. GRB 080319C: KAIT OA candidate
  80. GRB080319B Liverpool Telescope optical afterglow candidate
  81. GRB 080319B: Super-LOTIS Detection of a Bright OT
  82. GRB080319A: P60 Optical Afterglow Observations
  83. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  84. GRB 080319A: Swift detection of a burst
  85. Swift/UVOT observations of GRB 080315
  86. GRB 080315: Swift detection of a possible burst
  87. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  88. GRB 080307: NIR upper limit
  89. GRB 080310 afterglow candidate (correction to UT time)
  90. GRB 080310: Swift detection of a burst with optical afterglow
  91. GRB 080310 afterglow candidate
  92. GRB 080307, Swift-BAT refined analysis
  93. GRB 080307: TNT optical observation
  94. GRB 080307: Gemini-N i-band observations - candidate afterglow
  95. GRB 080307: retraction of UVOT candidate
  96. GRB 080307, Preliminary Swift-BAT refined analysis
  97. GRB 080307: Optical observation with DMC/KANATA
  98. GRB 080303, Swift-BAT refined analysis
  99. GRB 080303A: Faulkes Telescope South optical afterglow observations
  100. GRB 080303: Swift detection of a burst with optical afterglow

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