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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"

16161 results found.

  1. GRB 080506: NAYUTA Optical Observation
  2. GRB 080507: Keck photometry
  3. GRB 080507: E Pur Si Muove!
  4. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  5. GRB 080503: Hubble Space Telescope Imaging
  6. GRB080507: Swift/UVOT followup observations
  7. GRB 080507: Optical Afterglow
  8. GRB 080506:Optical observations from HCT
  9. GRB 080503: Fading in continued Gemini imaging
  10. GRB080503, RIMOTS optical upper limit
  11. GRB 080506: optical observation from Ondrejov
  12. GRB 080506: Optical observation with KANATA/TRISPEC
  13. GRB 080506: Swift detection of a burst with optical afterglow
  14. GRB 080503: Slow-rise optical AG ?
  15. GRB 080503: No further optical rebrightening
  16. GRB 080503: Late-time Optical rebrightening (possible mini-SN) - correction
  17. GRB 080503: Late-time Optical rebrightening (possible mini-SN)
  18. GRB 080503: MITSuME Ishigakijima optical upper limits
  19. GRB080503: Swift/UVOT Upper Limits
  20. GRB 080503: MITSuME Akeno optical upper limits
  21. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  22. GRB 080411: Continued Swift Monitoring
  23. GRB 080430: Optical observations
  24. GRB080430: RTT150 Optical Observations
  25. GRB 080430 optical observations
  26. GRB080430: optical observations
  27. GRB 080430: Hobby-Eberly Telescope Absorption Redshift
  28. GRB080430: Optical observation in AsU CAS Ondrejov & Brno
  29. GRB 080430: Bootes observation
  30. GRB 080430: Swift detection of a burst with optical afterglow
  31. GRB 080430: TAROT Calern observatory optical observations
  32. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  33. GRB080319A: MAGIC telescope GeV observation
  34. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  35. GRB080310, BVRcIc field calibration
  36. Swift XRT and UVOT observations of GRB080414
  37. GRB 080319B: Jet Break, Energetics, Supernova
  38. GRB 080413B: Faulkes Telescope South optical afterglow observations
  39. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  40. GRB 080413A: MOA-II optical afterglow observations
  41. GRB 080319B: Continued Gemini-N monitoring
  42. GRB 080414: RTT150 optical observations
  43. VLA radio observations of GRB 080413B
  44. VLA radio observations of GRB 080413A
  45. GRB080413B
  46. GRB 080413a, SMARTS optical/IR afterglow observations
  47. GRB 080413A Bootes observation
  48. GRB080413B: REM NIR & Optical Observation
  49. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  50. GRB 080413A: REM detection of the NIR Afterglow
  51. GRB 080413: TAROT Calern observatory optical observations
  52. GRB 080413: Swift detection of a burst with an optical afterglow
  53. GRB 080413: ROTSE-III Detection of Optical Counterpart
  54. GRB 080411: Swift/UVOT refined analysis
  55. GRB 080411: VLT redshift
  56. GRB 080411: GROND detection of optical afterglow candidate
  57. GRB080330: MAGIC telescope GeV observation
  58. GRB 080330: Swift-XRT refined position retraction
  59. GRB 080408: GROND detection of optical/NIR afterglow candidate
  60. GRB 080330 optical observations
  61. Swift/UVOT observations of GRB080409
  62. UVOT/Swift Observations of GRB080408
  63. GRB 080409: REM optical/NIR observations
  64. GRB 080319A: Early RAPTOR optical limits
  65. GRB 080319B: HST observations
  66. GRB 080330: RAPTOR detection of prompt optical flash
  67. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  68. GRB 080325: optical upper limit
  69. GRB 080328: GAO 150cm telescope Optical Observation
  70. GRB080330: optical observations
  71. GRB 080319B: TORTORA light curve (Correction)
  72. GRB080328, RIMOTS optical upper limit
  73. GRB080330: optical observations
  74. GRB 080330: REM optical observations
  75. GRB 080330, SMARTS optical/IR afterglow observations
  76. GRB080330: TNT optical observations
  77. GRB 080330: Redshift Confirmation from Hobby-Eberly Telescope Spectroscopy
  78. GRB 080330: GROND Observations
  79. GRB 080330: NOT redshift
  80. GRB 080330: TAROT Calern observatory optical observations
  81. GRB 080330: error in reported XRT position
  82. GRB 080330: Liverpool Telescope Optical observations
  83. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  84. GRB 080330: Swift detection of a burst with an optical counterpart
  85. GRB 080330: TAROT Calern observatory optical detection
  86. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  87. GRB 080328: BTA optical imaging and spectroscopy
  88. GRB080325 - I and z-band Imaging
  89. GRB080319B, BVRcIc field calibration
  90. GRB080328: Faulkes Telescope North observations
  91. GRB 080328: Swift detection of a burst with an optical counterpart
  92. GRB 080325: MITSuME Akeno optical upper limits
  93. GRB080319B: optical observations
  94. GRB 080325: Swift/UVOT Upper Limits
  95. GRB 080319D: GROND Detection of the Optical Counterpart
  96. GRB 080319B: Spitzer Mid-infrared Observations
  97. GRB 080319B: Second & Third Epoch WSRT Radio Observations
  98. Radio Detection of GRB 080319B
  99. GRB 080319B: Optical observation (Brno, CZ)
  100. GRB 080319B: optical upper limit

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