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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"

15739 results found.

  1. GRB 080430: Optical observations
  2. GRB080430: RTT150 Optical Observations
  3. GRB 080430 optical observations
  4. GRB080430: optical observations
  5. GRB 080430: Hobby-Eberly Telescope Absorption Redshift
  6. GRB080430: Optical observation in AsU CAS Ondrejov & Brno
  7. GRB 080430: Bootes observation
  8. GRB 080430: Swift detection of a burst with optical afterglow
  9. GRB 080430: TAROT Calern observatory optical observations
  10. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  11. GRB080319A: MAGIC telescope GeV observation
  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 080319B: Jet Break, Energetics, Supernova
  16. GRB 080413B: Faulkes Telescope South optical afterglow observations
  17. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  18. GRB 080413A: MOA-II optical afterglow observations
  19. GRB 080319B: Continued Gemini-N monitoring
  20. GRB 080414: RTT150 optical observations
  21. VLA radio observations of GRB 080413B
  22. VLA radio observations of GRB 080413A
  23. GRB080413B
  24. GRB 080413a, SMARTS optical/IR afterglow observations
  25. GRB 080413A Bootes observation
  26. GRB080413B: REM NIR & Optical Observation
  27. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  28. GRB 080413A: REM detection of the NIR Afterglow
  29. GRB 080413: TAROT Calern observatory optical observations
  30. GRB 080413: Swift detection of a burst with an optical afterglow
  31. GRB 080413: ROTSE-III Detection of Optical Counterpart
  32. GRB 080411: Swift/UVOT refined analysis
  33. GRB 080411: VLT redshift
  34. GRB 080411: GROND detection of optical afterglow candidate
  35. GRB080330: MAGIC telescope GeV observation
  36. GRB 080330: Swift-XRT refined position retraction
  37. GRB 080408: GROND detection of optical/NIR afterglow candidate
  38. GRB 080330 optical observations
  39. Swift/UVOT observations of GRB080409
  40. UVOT/Swift Observations of GRB080408
  41. GRB 080409: REM optical/NIR observations
  42. GRB 080319A: Early RAPTOR optical limits
  43. GRB 080319B: HST observations
  44. GRB 080330: RAPTOR detection of prompt optical flash
  45. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  46. GRB 080325: optical upper limit
  47. GRB 080328: GAO 150cm telescope Optical Observation
  48. GRB080330: optical observations
  49. GRB 080319B: TORTORA light curve (Correction)
  50. GRB080328, RIMOTS optical upper limit
  51. GRB080330: optical observations
  52. GRB 080330: REM optical observations
  53. GRB 080330, SMARTS optical/IR afterglow observations
  54. GRB080330: TNT optical observations
  55. GRB 080330: Redshift Confirmation from Hobby-Eberly Telescope Spectroscopy
  56. GRB 080330: GROND Observations
  57. GRB 080330: NOT redshift
  58. GRB 080330: TAROT Calern observatory optical observations
  59. GRB 080330: error in reported XRT position
  60. GRB 080330: Liverpool Telescope Optical observations
  61. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  62. GRB 080330: Swift detection of a burst with an optical counterpart
  63. GRB 080330: TAROT Calern observatory optical detection
  64. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  65. GRB 080328: BTA optical imaging and spectroscopy
  66. GRB080325 - I and z-band Imaging
  67. GRB080319B, BVRcIc field calibration
  68. GRB080328: Faulkes Telescope North observations
  69. GRB 080328: Swift detection of a burst with an optical counterpart
  70. GRB 080325: MITSuME Akeno optical upper limits
  71. GRB080319B: optical observations
  72. GRB 080325: Swift/UVOT Upper Limits
  73. GRB 080319D: GROND Detection of the Optical Counterpart
  74. GRB 080319B: Spitzer Mid-infrared Observations
  75. GRB 080319B: Second & Third Epoch WSRT Radio Observations
  76. Radio Detection of GRB 080319B
  77. GRB 080319B: Optical observation (Brno, CZ)
  78. GRB 080319B: optical upper limit
  79. GRB 080319D: optical upper limit
  80. GRB 080319C: UVOT Observations
  81. GRB 080319B: UVOT Observations
  82. GRB 080319A: UVOT Observations
  83. GRB 080319B - CARMA mm Observations
  84. GRB 080320: optical limit
  85. GRB 080320: Gemini-N optical afterglow
  86. GRB 080319B: Gemini-South photometry
  87. GRB 080319B optical observations
  88. GRB 080319B: WSRT Radio Observations
  89. GRB 080320: SDSS source and Gemini-N observations
  90. GRB 080320: optical limit from IAC80
  91. GRB 080319C: Early RAPTOR Observations
  92. GRB 080319C: KAIT OA observations
  93. GRB 080320: ROTSE-III Optical Limits
  94. GRB 080319B : Lulin observation of temporal break at 0.2 days
  95. GRB 080319B: ROTSE-III Observations of Optical Counterpart
  96. GRB 080319B: optical observations
  97. GRB 080319B: RAPTOR observations of a naked eye burst
  98. GRB 080319A: Swift-XRT Team Refined Analysis
  99. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  100. GRB 080319B: Hobby-Eberly Telescope Spectroscopy

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