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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"

25807 results found.

  1. GRB 080319B: HST observations
  2. GRB 080405: Swift-BAT refined analysis
  3. GRB 080405: Swift-XRT position
  4. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  5. GRB 080325: optical upper limit
  6. GRB 080328: GAO 150cm telescope Optical Observation
  7. GRB080330: Improved Swift XRT Position
  8. GRB080328, RIMOTS optical upper limit
  9. GRB080330: Swift XRT refined analysis
  10. GRB 080330: REM optical observations
  11. GRB 080330 Swift-UVOT refined analysis
  12. GRB 080328: Suzaku WAM observation of the prompt emission
  13. GRB080330: TNT optical observations
  14. Konus-Wind observation of GRB 080328
  15. GRB 080330: Redshift Confirmation from Hobby-Eberly Telescope Spectroscopy
  16. GRB080330: LOAO R-band Detection
  17. GRB 080330: GROND Observations
  18. GRB 080330A: PAIRITEL Infrared Detections
  19. GRB 080330: error in reported XRT position
  20. GRB080330 - SDSS Pre-Burst Observations
  21. GRB 080330: Liverpool Telescope Optical observations
  22. GRB 080330: Swift detection of a burst with an optical counterpart
  23. GRB 080330: TAROT Calern observatory optical detection
  24. GRB 080328: BTA optical imaging and spectroscopy
  25. GRB 080328: Swift XRT refined analysis
  26. Swift/UVOT observations of GRB080328
  27. GRB080319B, BVRcIc field calibration
  28. GRB 080328: Enhanced Swift-XRT position
  29. GRB080328: Faulkes Telescope North observations
  30. GRB 080328: Swift detection of a burst with an optical counterpart
  31. GRB 080325: Subaru detection of NIR afterglow candidate
  32. GRB080310, late-time photometry with LBT
  33. GRB080325: XRT Refined Analysis
  34. GRB 080325: GROND Observations
  35. GRB 080325: Swift/UVOT Upper Limits
  36. GRB 080325: Early observations from OSN
  37. GRB 080325: NIR afterglow candidate
  38. GRB 080319D: GROND Detection of the Optical Counterpart
  39. GRB 080325: Enhanced Swift-XRT position
  40. GRB 080325: Swift detection of a burst
  41. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  42. GRB 080319B: Spitzer Mid-infrared Observations
  43. GRB 080319C: Suzaku WAM observation of the prompt emission
  44. Radio Detection of GRB 080319B
  45. GRB 080320, Swift-BAT refined analysis
  46. GRB 080319D: GROND Observations
  47. GRB 080319B: optical upper limit
  48. GRB 080319D: optical upper limit
  49. GRB080319B: Time-Independent XRT Spectrum
  50. GRB 080319C: UVOT Observations
  51. GRB 080319B: UVOT Observations
  52. GRB 080319A: UVOT Observations
  53. GRB 080320: Swift XRT refined analysis
  54. GRB 080320: J detection with FLAMINGOS
  55. GRB 080319D: Swift XRT refined analysis
  56. GRB 080320: optical limit
  57. GRB 080320: Gemini-N optical afterglow
  58. Konus-Wind observation of GRB 080319C
  59. GRB 080319C, Swift-BAT refined analysis
  60. GRB 080320: Enhanced Swift-XRT position
  61. GRB 080320 - SDSS Pre-Burst Observations
  62. GRB 080320: Swift detection of a burst
  63. GRB 080319C - SDSS Pre-Burst Observations
  64. GRB 080319A SDSS Pre-Burst Observations
  65. GRB080319B - SDSS Pre-Burst Observations
  66. GRB 080319B: RAPTOR observations of a naked eye burst
  67. GRB 080319A: Swift-XRT Team Refined Analysis
  68. GRB 080319C: Swift-XRT Team Refined Analysis
  69. GRB 080319B: Swift-XRT Team Refined Analysis
  70. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  71. GRB 080319C: AGILE-MCAL observation of the prompt emission
  72. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  73. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  74. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  75. GRB 080319B: TORTORA synchronous observation
  76. GRB 080319B: Enhanced Swift-XRT position
  77. GRB 080319A: Enhanced Swift-XRT position
  78. GRB 080319B: REM early data
  79. GRB 080319C: Swift detection of a burst with an optical afterglow
  80. GRB 080319A: REM observations
  81. GRB 080319B: Change in power law decay index
  82. GRB 080319B: Gemini-South Spectroscopy
  83. GRB 080319A: optical observations at the NOT
  84. GRB080319B Liverpool Telescope optical afterglow candidate
  85. GRB 080319B: REM observations
  86. GRB080319A: P60 Optical Afterglow Observations
  87. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  88. GRB 080319A: Swift detection of a burst
  89. GRB080310, LBT and MDM photometry
  90. GRB080315: Bok Optical Observations
  91. Swift/UVOT observations of GRB 080315
  92. GRB 080315: Optical observations
  93. GRB 080315: TAROT Calern observatory optical observations
  94. GRB 080315: Swift detection of a possible burst
  95. GRB 080307: GAO 150cm telescope Optical Observation
  96. GRB 080229A: GAO 150cm telescope Optical Observation
  97. GRB 080310, Swift-BAT refined analysis
  98. GRB 080310: Swift-XRT refined analysis
  99. GRB 080310: Swift/UVOT Refined Analysis
  100. GRB 080310 - SDSS Pre-Burst Observations

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