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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"

19862 results found.

  1. VLA radio observations of GRB 080413B
  2. VLA radio observations of GRB 080413A
  3. GRB080413B
  4. Swift-BAT spectral lag analysis of GRB 080413B
  5. GRB 080413a, SMARTS optical/IR afterglow observations
  6. GRB 080413B: Swift XRT refined analysis
  7. GRB080413A: Swift/UVOT observations
  8. GRB080413B: REM NIR & Optical Observation
  9. GRB 080413B: GROND detection of afterglow in all bands
  10. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  11. GRB 080413A: REM detection of the NIR Afterglow
  12. GRB 080413: Enhanced Swift-XRT position
  13. GRB 080413: TAROT Calern observatory optical observations
  14. GRB 080413: Swift detection of a burst with an optical afterglow
  15. GRB 080411: Swift/UVOT refined analysis
  16. GRB 080411: Swift-XRT Refined Analysis
  17. GRB 080411: Enhanced Swift-XRT position
  18. GRB 080411: GROND detection of optical afterglow candidate
  19. GRB 080411: Swift detection of a bright burst
  20. GRB 080408: GROND detection of optical/NIR afterglow candidate
  21. GRB 080330 optical observations
  22. Swift/UVOT observations of GRB080409
  23. GRB 080409: Swift XRT refined analysis
  24. GRB 080409: Enhanced Swift-XRT position
  25. GRB 080409: REM optical/NIR observations
  26. GRB 080409: Swift detection of a burst
  27. GRB 080319A: Early RAPTOR optical limits
  28. GRB 080319B: HST observations
  29. GRB 080405: Swift-BAT refined analysis
  30. GRB 080405: Swift-XRT position
  31. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  32. GRB 080325: optical upper limit
  33. GRB 080328: GAO 150cm telescope Optical Observation
  34. GRB080330: Improved Swift XRT Position
  35. GRB080328, RIMOTS optical upper limit
  36. GRB 080330: REM optical observations
  37. GRB 080330 Swift-UVOT refined analysis
  38. GRB080330: TNT optical observations
  39. GRB 080330: GROND Observations
  40. GRB 080330A: PAIRITEL Infrared Detections
  41. GRB 080330: error in reported XRT position
  42. GRB080330 - SDSS Pre-Burst Observations
  43. GRB 080330: Swift detection of a burst with an optical counterpart
  44. GRB 080330: TAROT Calern observatory optical detection
  45. Swift/UVOT observations of GRB080328
  46. GRB080319B, BVRcIc field calibration
  47. GRB 080328: Enhanced Swift-XRT position
  48. GRB 080328: Swift detection of a burst with an optical counterpart
  49. GRB 080325: Subaru detection of NIR afterglow candidate
  50. GRB 080325: GROND Observations
  51. GRB 080325: Swift/UVOT Upper Limits
  52. GRB 080319C: Gemini-North spectroscopic redshift
  53. GRB 080325: Early observations from OSN
  54. GRB 080325: NIR afterglow candidate
  55. GRB 080319D: GROND Detection of the Optical Counterpart
  56. GRB 080325: Enhanced Swift-XRT position
  57. GRB 080325: Swift detection of a burst
  58. GRB 080319B: Spitzer Mid-infrared Observations
  59. GRB 080319B: Second & Third Epoch WSRT Radio Observations
  60. Radio Detection of GRB 080319B
  61. GRB 080319D: GROND Observations
  62. GRB 080319B: optical upper limit
  63. GRB 080319D: optical upper limit
  64. GRB 080319D, Swift-BAT refined analysis
  65. GRB 080319C: UVOT Observations
  66. GRB 080319B: UVOT Observations
  67. GRB 080319A: UVOT Observations
  68. GRB 080320: Swift XRT refined analysis
  69. GRB 080320: J detection with FLAMINGOS
  70. GRB 080319D: Swift XRT refined analysis
  71. GRB 080320: optical limit
  72. GRB 080320: Gemini-N optical afterglow
  73. Konus-Wind observation of GRB 080319C
  74. Konus-Wind observation of GRB 080319B
  75. GRB 080320: Enhanced Swift-XRT position
  76. GRB 080320 - SDSS Pre-Burst Observations
  77. GRB 080320: Swift detection of a burst
  78. GRB 080319C - SDSS Pre-Burst Observations
  79. GRB 080319A SDSS Pre-Burst Observations
  80. GRB080319B - SDSS Pre-Burst Observations
  81. GRB 080319C: Swift-XRT Team Refined Analysis
  82. GRB 080319B: Swift-XRT Team Refined Analysis
  83. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  84. GRB 080319C: AGILE-MCAL observation of the prompt emission
  85. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  86. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  87. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  88. GRB 080319B: TORTORA synchronous observation
  89. GRB 080319B: Enhanced Swift-XRT position
  90. GRB 080319A: Enhanced Swift-XRT position
  91. GRB 080319C: Swift detection of a burst with an optical afterglow
  92. GRB 080319A: REM observations
  93. GRB 080319B: Change in power law decay index
  94. GRB 080319A: optical observations at the NOT
  95. GRB 080319B: REM observations
  96. GRB080319A: P60 Optical Afterglow Observations
  97. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  98. GRB 080319A: Swift detection of a burst
  99. GRB080310, LBT and MDM photometry
  100. GRB080315: Bok Optical Observations

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