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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"

18327 results found.

  1. VLA radio upper limit on GRB 080430
  2. GRB 080430: Enhanced Swift-XRT position
  3. GRB 080430 - SDSS Pre-Burst Observations
  4. GRB 080430: Swift detection of a burst with optical afterglow
  5. GRB 080430: TAROT Calern observatory optical observations
  6. GRB080426: Swift/UVOT upper limits
  7. GRB 080426: Enhanced Swift-XRT position
  8. GRB 080426, Swift-BAT refined analysis
  9. GRB 080426: Swift detection of a possibly short burst
  10. GRB 080320 : Faulkes Telescope North Observations
  11. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  12. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  13. GRB080310, BVRcIc field calibration
  14. Swift XRT and UVOT observations of GRB080414
  15. GRB 080413B: Faulkes Telescope South optical afterglow observations
  16. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  17. GRB 080414: RTT150 optical observations
  18. VLA radio observations of GRB 080413B
  19. VLA radio observations of GRB 080413A
  20. GRB080413B
  21. GRB 080413a, SMARTS optical/IR afterglow observations
  22. GRB080413A: Swift/UVOT observations
  23. GRB 080413A: Swift-XRT refined analysis
  24. GRB080413B: REM NIR & Optical Observation
  25. GRB 080413B: GROND detection of afterglow in all bands
  26. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  27. GRB 080413A: REM detection of the NIR Afterglow
  28. GRB 080413: Enhanced Swift-XRT position
  29. GRB 080413: TAROT Calern observatory optical observations
  30. GRB 080413: Swift detection of a burst with an optical afterglow
  31. GRB 080411: Swift/UVOT refined analysis
  32. GRB 080411: Swift-XRT Refined Analysis
  33. GRB 080411: Enhanced Swift-XRT position
  34. GRB 080411: GROND detection of optical afterglow candidate
  35. GRB 080411: Swift detection of a bright burst
  36. GRB 080408: GROND detection of optical/NIR afterglow candidate
  37. GRB 080330 optical observations
  38. Swift/UVOT observations of GRB080409
  39. GRB 080409: Enhanced Swift-XRT position
  40. GRB 080409: REM optical/NIR observations
  41. GRB 080409: Swift detection of a burst
  42. GRB 080319A: Early RAPTOR optical limits
  43. GRB 080319B: HST observations
  44. GRB 080405: Swift-BAT refined analysis
  45. GRB 080405: Swift-XRT position
  46. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  47. GRB 080325: optical upper limit
  48. GRB 080328: GAO 150cm telescope Optical Observation
  49. GRB080330: Improved Swift XRT Position
  50. GRB080328, RIMOTS optical upper limit
  51. GRB 080330: REM optical observations
  52. GRB 080330 Swift-UVOT refined analysis
  53. GRB080330: TNT optical observations
  54. GRB 080330, Swift-BAT refined analysis
  55. GRB 080330: GROND Observations
  56. GRB 080330A: PAIRITEL Infrared Detections
  57. GRB 080330: error in reported XRT position
  58. GRB080330 - SDSS Pre-Burst Observations
  59. GRB 080330: Swift detection of a burst with an optical counterpart
  60. GRB 080330: TAROT Calern observatory optical detection
  61. Swift/UVOT observations of GRB080328
  62. GRB080319B, BVRcIc field calibration
  63. GRB 080328: Enhanced Swift-XRT position
  64. GRB 080328: Swift detection of a burst with an optical counterpart
  65. GRB 080325: Subaru detection of NIR afterglow candidate
  66. GRB080310, late-time photometry with LBT
  67. GRB 080325: GROND Observations
  68. GRB 080325: Swift/UVOT Upper Limits
  69. GRB 080325: Early observations from OSN
  70. GRB 080325: NIR afterglow candidate
  71. GRB 080319D: GROND Detection of the Optical Counterpart
  72. GRB 080325: Enhanced Swift-XRT position
  73. GRB 080325: Swift detection of a burst
  74. GRB 080319B: Spitzer Mid-infrared Observations
  75. Radio Detection of GRB 080319B
  76. GRB 080319D: GROND Observations
  77. GRB 080319B: optical upper limit
  78. GRB 080319D: optical upper limit
  79. GRB 080319C: UVOT Observations
  80. GRB 080319B: UVOT Observations
  81. GRB 080319A: UVOT Observations
  82. GRB 080320: Swift XRT refined analysis
  83. GRB 080320: J detection with FLAMINGOS
  84. GRB 080319D: Swift XRT refined analysis
  85. GRB 080320: optical limit
  86. GRB 080320: Gemini-N optical afterglow
  87. GRB 080319C, Swift-BAT refined analysis
  88. GRB 080320: Enhanced Swift-XRT position
  89. GRB 080320 - SDSS Pre-Burst Observations
  90. GRB 080320: Swift detection of a burst
  91. GRB 080319C - SDSS Pre-Burst Observations
  92. GRB 080319A SDSS Pre-Burst Observations
  93. GRB080319B - SDSS Pre-Burst Observations
  94. GRB 080319C: Swift-XRT Team Refined Analysis
  95. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  96. GRB 080319C: AGILE-MCAL observation of the prompt emission
  97. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  98. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  99. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  100. GRB 080319B: TORTORA synchronous observation

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