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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"

14331 results found.

  1. GRB 080604: Swift detection of a burst with an optical afterglow
  2. GRB080603B: NOT redshift
  3. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  4. GRB 080603B: Swift detection of a burst with optical afterglow
  5. GRB080603: Super-LOTIS detection of Optical Counterpart
  6. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  7. GRB 080603: Gemini-North redshift
  8. GRB 080602: Swift detection of a burst
  9. Reactivation of SGR 1627-41
  10. GRB 080524: Swift-BAT detection of a burst in ground analysis
  11. GRB 080520: VLT host detection
  12. GRB 080523: VLT optical observations
  13. GRB 080523: Swift detection of a burst
  14. GRB 080515: KPNO 4m NIR afterglow detection
  15. GRB080521(?): detection of possible burst from BAT slew data and XRT ToO
  16. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  17. GRB 080514B: UVOT Observations
  18. GRB 080520: Swift detection of a burst with optical afterglow
  19. GRB 080517: Swift detection of a burst
  20. GRB 080514B: NOT observations
  21. GRB 080516: Swift detection of a burst
  22. GRB 080515: Swift detection of a burst
  23. GRB 080514B: possible AGILE detection at E>50 MeV
  24. Swift detection of a possible galactic transient
  25. GRB 080507: E Pur Si Muove!
  26. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  27. GRB 080503: Hubble Space Telescope Imaging
  28. GRB 080507: GRB localization by SuperAGILE
  29. GRB 080506: TLS 2nd Epoch - possible light curve break
  30. GRB 080506: TLS afterglow detection in VRIZ
  31. GRB 080506: Swift detection of a burst with optical afterglow
  32. GRB 080503: Late-time Optical rebrightening (possible mini-SN)
  33. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  34. GRB 080503: Swift detection of a short burst
  35. GRB080430: Swift/UVOT observations
  36. GRB 080430 - multicolor observations of the afterglow
  37. GRB 080430 optical observations
  38. GRB 080430: Swift detection of a burst with optical afterglow
  39. GRB 080426: Swift detection of a possibly short burst
  40. Possible GRB 080315: XRT non-detection of afterglow
  41. GRB 080420?: Swift detection of a possible short burst
  42. GRB 080413B: VLT redshift
  43. GRB 080413B: GROND detection of afterglow in all bands
  44. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  45. GRB 080413A: REM detection of the NIR Afterglow
  46. GRB 080413: Swift detection of a burst with an optical afterglow
  47. GRB 080413: ROTSE-III Detection of Optical Counterpart
  48. GRB 080411: GROND detection of optical afterglow candidate
  49. GRB 080411: Swift detection of a bright burst
  50. GRB 080408: GROND detection of optical/NIR afterglow candidate
  51. GRB 080408: Swift-XRT position of a possible afterglow
  52. GRB 080409: Swift detection of a burst
  53. GRB 080330: RAPTOR detection of prompt optical flash
  54. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  55. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  56. GRB080330: LOAO R-band Detection
  57. GRB 080330: TAROT Calern observatory optical observations
  58. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  59. GRB 080330: Swift detection of a burst with an optical counterpart
  60. GRB 080330: TAROT Calern observatory optical detection
  61. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  62. GRB 080328: BTA optical imaging and spectroscopy
  63. GRB080328: Faulkes Telescope North observations
  64. GRB 080328: Swift detection of a burst with an optical counterpart
  65. GRB 080325: Subaru detection of NIR afterglow candidate
  66. GRB 080325: NIR afterglow candidate
  67. GRB 080319D: GROND Detection of the Optical Counterpart
  68. GRB 080325: Swift detection of a burst
  69. GRB 080319B: Second & Third Epoch WSRT Radio Observations
  70. Radio Detection of GRB 080319B
  71. GRB 080319B - CARMA mm Observations
  72. GRB 080320: J detection with FLAMINGOS
  73. GRB 080319B: Allen Telescope Array Observations
  74. GRB 080319B optical observations
  75. GRB 080320: Swift detection of a burst
  76. GRB 080319C: AGILE-MCAL observation of the prompt emission
  77. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  78. GRB 080319B: TORTORA synchronous observation
  79. GRB 080319C: Swift detection of a burst with an optical afterglow
  80. GRB 080319B: Super-LOTIS Detection of a Bright OT
  81. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  82. GRB 080319A: Swift detection of a burst
  83. Swift trigger 306323: Swift-BAT/XRT refined analysis
  84. SAX J1818.6-1703: Swift detection (trigger 306379)
  85. GRB 080315: Swift detection of a possible burst
  86. GRB 080310: ROTSE-III Observations of Optical Counterpart
  87. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  88. GRB080310, detection of break in optical
  89. GRB 080310: Magellan redshift revision
  90. GRB 080310: Swift detection of a burst with optical afterglow
  91. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  92. GRB 080307: BOAO imaging - retraction and new limit
  93. GRB 080307: Swift detection of a burst
  94. VLA possible radio detection of GRB 080229
  95. GRB 080303: Swift/UVOT follow-up of afterglow detection
  96. GRB 080303: Swift detection of a burst with optical afterglow
  97. GRB 080229: Faulkes Telescope South optical limit
  98. GRB 080229: Swift detection of a bright burst
  99. GRB080205: optical observations
  100. GRB 080218B: Swift detection of a burst

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