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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

20403 results found.

  1. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  2. GRB 080507: Keck photometry
  3. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  4. GRB 080507: Optical Afterglow
  5. GRB 080506:Optical observations from HCT
  6. GRB 080506: VLA radio upper limit
  7. GRB080506: Swift/UVOT observations
  8. GRB 080506, Swift-BAT refined analysis
  9. GRB080503, RIMOTS optical upper limit
  10. GRB 080506: Observations from NOT
  11. GRB 080506: TLS afterglow detection in VRIZ
  12. GRB 080506: Enhanced Swift-XRT position
  13. GRB 080506: Swift detection of a burst with optical afterglow
  14. GRB 080503: VLA radio upper limit
  15. GRB 080503: Observations from NOT
  16. GRB 080430: TLS imaging one day after the GRB
  17. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  18. GRB080503 XRT refined analysis
  19. GRB 080503, Swift-BAT refined analysis
  20. GRB 080430
  21. GRB 080503: Enhanced Swift-XRT position
  22. GRB 080503: New candidate afterglow/host in Gemini imaging
  23. GRB 080503: Swift detection of a short burst
  24. GRB080430: Swift/UVOT observations
  25. VLA radio upper limit on GRB 080430
  26. GRB 080430: Enhanced Swift-XRT position
  27. GRB 080430 - SDSS Pre-Burst Observations
  28. GRB 080430: Swift detection of a burst with optical afterglow
  29. GRB 080430: TAROT Calern observatory optical observations
  30. GRB080426: Swift/UVOT upper limits
  31. GRB 080426: Enhanced Swift-XRT position
  32. GRB 080426: Swift detection of a possibly short burst
  33. Possible GRB 080315: XRT non-detection of afterglow
  34. GRB 080320 : Faulkes Telescope North Observations
  35. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  36. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  37. GRB080310, BVRcIc field calibration
  38. Swift XRT and UVOT observations of GRB080414
  39. GRB 080413B: Faulkes Telescope South optical afterglow observations
  40. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  41. GRB 080414: RTT150 optical observations
  42. VLA radio observations of GRB 080413B
  43. VLA radio observations of GRB 080413A
  44. GRB080413B
  45. Swift-BAT spectral lag analysis of GRB 080413B
  46. GRB 080413a, SMARTS optical/IR afterglow observations
  47. GRB 080413B: Swift XRT refined analysis
  48. GRB080413A: Swift/UVOT observations
  49. GRB080413B: REM NIR & Optical Observation
  50. GRB 080413B: GROND detection of afterglow in all bands
  51. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  52. GRB 080413A: REM detection of the NIR Afterglow
  53. GRB 080413: Enhanced Swift-XRT position
  54. GRB 080413: TAROT Calern observatory optical observations
  55. GRB 080413: Swift detection of a burst with an optical afterglow
  56. GRB 080411: Swift/UVOT refined analysis
  57. GRB 080411: Swift-XRT Refined Analysis
  58. GRB 080411: Enhanced Swift-XRT position
  59. GRB 080411: GROND detection of optical afterglow candidate
  60. GRB 080411: Swift detection of a bright burst
  61. GRB 080408: GROND detection of optical/NIR afterglow candidate
  62. GRB 080330 optical observations
  63. Swift/UVOT observations of GRB080409
  64. GRB 080409: Swift XRT refined analysis
  65. GRB 080409: Enhanced Swift-XRT position
  66. GRB 080409: REM optical/NIR observations
  67. GRB 080409: Swift detection of a burst
  68. GRB 080319A: Early RAPTOR optical limits
  69. GRB 080319B: HST observations
  70. GRB 080405: Swift-BAT refined analysis
  71. GRB 080405: Swift-XRT position
  72. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  73. GRB 080325: optical upper limit
  74. GRB 080328: GAO 150cm telescope Optical Observation
  75. GRB080330: Improved Swift XRT Position
  76. GRB080328, RIMOTS optical upper limit
  77. GRB 080330: REM optical observations
  78. GRB 080330 Swift-UVOT refined analysis
  79. GRB080330: TNT optical observations
  80. GRB 080330: GROND Observations
  81. GRB 080330A: PAIRITEL Infrared Detections
  82. GRB 080330: error in reported XRT position
  83. GRB080330 - SDSS Pre-Burst Observations
  84. GRB 080330: Swift detection of a burst with an optical counterpart
  85. GRB 080330: TAROT Calern observatory optical detection
  86. Swift/UVOT observations of GRB080328
  87. GRB080319B, BVRcIc field calibration
  88. GRB 080328: Enhanced Swift-XRT position
  89. GRB 080328: Swift detection of a burst with an optical counterpart
  90. GRB 080325: Subaru detection of NIR afterglow candidate
  91. GRB 080325: GROND Observations
  92. GRB 080325: Swift/UVOT Upper Limits
  93. GRB 080319C: Gemini-North spectroscopic redshift
  94. GRB 080325: Early observations from OSN
  95. GRB 080325: NIR afterglow candidate
  96. GRB 080319D: GROND Detection of the Optical Counterpart
  97. GRB 080325: Enhanced Swift-XRT position
  98. GRB 080325: Swift detection of a burst
  99. GRB 080319B: Spitzer Mid-infrared Observations
  100. GRB 080319B: Second & Third Epoch WSRT Radio Observations

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