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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"

7282 results found.

  1. Swift trigger 322590: BAT detection of a possible burst
  2. GRB080825: Afterglow confirmation and redshift estimate
  3. GRB 080825B - optical counterpart candidate
  4. GRB 080822B: MASTER optical observation
  5. GRB 080822: Swift detection of a short burst
  6. GRB 080810: Swift detection of a burst with a bright optical afterglow
  7. GRB 080805: Afterglow confirmation
  8. GRB 080805: GROND detection of possible afterglow
  9. GRB 080805: Swift detection of a burst
  10. GRB 080804: Swift detection of a burst with optical afterglow
  11. GRB 080804: ROTSE-III Detection of Optical Counterpart
  12. GRB 080802: Swift detection of a probable burst
  13. GRB 080727C: Swift detection of a burst
  14. GRB 080727B: REM prompt observations
  15. GRB 080727B: Swift detection of a bright burst
  16. GRB 080727: Swift detection of a burst
  17. GRB 080723A: optical upper limit
  18. GRB 080725: REM prompt observations
  19. GRB 080723: Swift detection of a burst
  20. GRB 080721: UVOT Follow-Up Observations
  21. GRB 080721: Swift detection of a burst with a bright optical counterpart.
  22. Trigger 317393: Swift detection of a possible GRB
  23. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  24. GRB 080714: Swift detection of a burst
  25. GRB 080702A: optical upper limit
  26. GRB 080710: KAIT OA candidate
  27. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  28. GRB 080707: Swift detection of a burst
  29. GRB 080703: UVOT Follow-Up Observation
  30. GRB 080703: Swift detection of a burst with optical afterglow
  31. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  32. GRB 080702A: MITSuME Akeno optical upper limits
  33. GRB 080702B : Burst detected in BAT during Swift slew
  34. GRB 080702: Swift detection of a short burst
  35. Trigger 315630: Swift detection of a possible burst
  36. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  37. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  38. GRB 070809: Putative host galaxy and redshift
  39. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  40. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  41. GRB 080613B: Swift detection of a burst
  42. GRB 080613: Faulkes Telescope North optical candidate
  43. Swift observations of BAT Slew Survey event (Trigger=010)
  44. GRB 080607: Swift detection of a burst with optical afterglow
  45. GRB 080607: ROTSE-III Detection of Optical Counterpart
  46. GRB 080605: GROND detection of the optical afterglow candidate
  47. GRB 080605: Liverpool Telescope optical afterglow candidate
  48. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  49. GRB 080604: Swift detection of a burst with an optical afterglow
  50. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  51. GRB 080603B: Swift detection of a burst with optical afterglow
  52. GRB 080603: Gemini-North redshift
  53. GRB 080603 OA candidate
  54. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  55. GRB 080602: Swift detection of a burst
  56. GRB 080523: Swift detection of a burst
  57. GRB 080520, GROND observations
  58. GRB 080520: Swift detection of a burst with optical afterglow
  59. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  60. GRB 080516: Swift detection of a burst
  61. GRB 080514B : redshift estimation
  62. GRB 080514B, GROND observations
  63. GRB 080514B: Finding chart
  64. GRB 080514B: Afterglow candidate
  65. Swift detection of a possible galactic transient
  66. GRB 080507: E Pur Si Muove!
  67. GRB080507: Swift/UVOT followup observations
  68. GRB 080506: Swift detection of a burst with optical afterglow
  69. GRB 080503: MITSuME Ishigakijima optical upper limits
  70. GRB 080503: MITSuME Akeno optical upper limits
  71. GRB 080503: New candidate afterglow/host in Gemini imaging
  72. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  73. GRB 080503: Swift detection of a short burst
  74. GRB 080430: Swift detection of a burst with optical afterglow
  75. GRB 080426: Swift detection of a possibly short burst
  76. GRB 080420?: Swift detection of a possible short burst
  77. GRB 080413B: Swift XRT refined analysis
  78. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  79. GRB 080413A: REM detection of the NIR Afterglow
  80. GRB 080413: TAROT Calern observatory optical observations
  81. GRB 080413: Swift detection of a burst with an optical afterglow
  82. GRB 080413: ROTSE-III Detection of Optical Counterpart
  83. GRB 080411: GROND detection of optical afterglow candidate
  84. GRB 080408: GROND detection of optical/NIR afterglow candidate
  85. GRB 080409: Swift detection of a burst
  86. GRB 080330: Liverpool Telescope Optical observations
  87. GRB 080330: Swift detection of a burst with an optical counterpart
  88. GRB 080330: TAROT Calern observatory optical detection
  89. GRB080325 - I and z-band Imaging
  90. GRB 080328: Swift detection of a burst with an optical counterpart
  91. GRB 080325: Subaru detection of NIR afterglow candidate
  92. GRB 080325: MITSuME Akeno optical upper limits
  93. GRB 080325: GROND Observations
  94. GRB 080325: Swift/UVOT Upper Limits
  95. GRB 080325: NIR afterglow candidate
  96. GRB 080325: Swift detection of a burst
  97. GRB 080319D: optical upper limit
  98. GRB 080320: Early Super-LOTIS Observations
  99. GRB 080320: Swift detection of a burst
  100. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate

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