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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"

23403 results found.

  1. VLA upper limit on GRB 080705
  2. IPN triangulation of bright GRB 080513
  3. GRB 080514B: slow fading behaviour ?
  4. GRB 080514B: Swift-XRT analysis
  5. GRB 080514B, GROND observations
  6. GRB 080515: Swift detection of a burst
  7. GRB 080514B: Watcher observations
  8. GRB 080514B: SuperAGILE/IPN GRB Localization
  9. procesure for GRB Circular
  10. Swift detection of a possible galactic transient
  11. GRB080514: REM NIR & Optical Observations
  12. GRB 080506: NAYUTA Optical Observation
  13. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  14. GRB 080507: Keck photometry
  15. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  16. GRB080507: Swift/UVOT followup observations
  17. GRB 080507: Optical Afterglow
  18. GRB 080506:Optical observations from HCT
  19. GRB 080506: VLA radio upper limit
  20. GRB 080507: GRB localization by SuperAGILE
  21. GRB 080506: Swift XRT refined analysis
  22. GRB080506: Swift/UVOT observations
  23. GRB 080506, Swift-BAT refined analysis
  24. GRB080503, RIMOTS optical upper limit
  25. GRB 080506: Observations from NOT
  26. GRB 080506: TLS afterglow detection in VRIZ
  27. GRB 080506: Enhanced Swift-XRT position
  28. GRB 080506: Swift detection of a burst with optical afterglow
  29. GRB 080503: VLA radio upper limit
  30. GRB 080503: Observations from NOT
  31. GRB 080430: TLS imaging one day after the GRB
  32. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  33. GRB 080503: MITSuME Ishigakijima optical upper limits
  34. GRB080503: Swift/UVOT Upper Limits
  35. GRB 080430
  36. GRB 080430
  37. GRB 080430
  38. GRB 080503: Enhanced Swift-XRT position
  39. GRB 080503: MITSuME Akeno optical upper limits
  40. GRB 080503: New candidate afterglow/host in Gemini imaging
  41. GRB 080503: Swift detection of a short burst
  42. GRB080430: RTT150 Optical Observations
  43. GRB080430: Swift/UVOT observations
  44. VLA radio upper limit on GRB 080430
  45. GRB 080430: Enhanced Swift-XRT position
  46. GRB 080430 - SDSS Pre-Burst Observations
  47. GRB 080430: Swift detection of a burst with optical afterglow
  48. GRB 080430: TAROT Calern observatory optical observations
  49. GRB960202B - on the association with SN 1996cr
  50. GRB 080426: Swift-XRT refined analysis
  51. GRB080426: Swift/UVOT upper limits
  52. GRB 080426: Enhanced Swift-XRT position
  53. GRB 080426: Swift detection of a possibly short burst
  54. Possible GRB 080315: XRT non-detection of afterglow
  55. GRB 080320 : Faulkes Telescope North Observations
  56. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  57. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  58. GRB 080420?: Swift detection of a possible short burst
  59. GRB080310, BVRcIc field calibration
  60. Swift XRT and UVOT observations of GRB080414
  61. GRB 080319B: Jet Break, Energetics, Supernova
  62. GRB 080413B: Faulkes Telescope South optical afterglow observations
  63. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  64. GRB 080414: RTT150 optical observations
  65. VLA radio observations of GRB 080413B
  66. VLA radio observations of GRB 080413A
  67. GRB080413B
  68. GRB 080413a, SMARTS optical/IR afterglow observations
  69. GRB080413A: Swift/UVOT observations
  70. GRB 080413A: Swift-XRT refined analysis
  71. GRB080413B: REM NIR & Optical Observation
  72. GRB 080413B: GROND detection of afterglow in all bands
  73. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  74. GRB 080413A: REM detection of the NIR Afterglow
  75. GRB 080413: Enhanced Swift-XRT position
  76. GRB 080413: TAROT Calern observatory optical observations
  77. GRB 080413: Swift detection of a burst with an optical afterglow
  78. GRB 080411: Swift/UVOT refined analysis
  79. GRB 080411: Swift-XRT Refined Analysis
  80. GRB 080411: Enhanced Swift-XRT position
  81. GRB 080411: GROND detection of optical afterglow candidate
  82. GRB 080411: Swift detection of a bright burst
  83. GRB 080409: Swift-BAT refined analysis
  84. GRB 080408: GROND detection of optical/NIR afterglow candidate
  85. GRB 080330 optical observations
  86. Swift/UVOT observations of GRB080409
  87. GRB 080409: Swift XRT refined analysis
  88. UVOT/Swift Observations of GRB080408
  89. GRB 080409: Enhanced Swift-XRT position
  90. GRB 080409: REM optical/NIR observations
  91. GRB 080409: Swift detection of a burst
  92. GRB 080408: GRB Localization by SuperAGILE
  93. GRB 080319A: Early RAPTOR optical limits
  94. GRB 080319B: HST observations
  95. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  96. GRB 080405: Swift-BAT refined analysis
  97. GRB 080405: Swift-XRT position
  98. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  99. GRB 080325: optical upper limit
  100. GRB 080328: GAO 150cm telescope Optical Observation

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