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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"

21770 results found.

  1. GRB 100413A: GROND Upper limits
  2. GRB 100413A: Swift/UVOT Upper Limits
  3. Konus-Wind observation of GRB 100413A
  4. GRB 100413A: SARA upper limit
  5. GRB 100413A: Enhanced Swift-XRT position
  6. GRB 100413A: Swift detection of a burst
  7. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  8. Trigger 419015 is probably not a GRB
  9. GRB100401A: GROND Upper Limits
  10. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  11. GRB 100331B: GROND Upper limits
  12. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  13. GRB 100331B: BOOTES-3 observations
  14. GRB 100324B: Suzaku WAM observation of the prompt emission
  15. GRB 100331B: Swift/UVOT Upper Limits
  16. GRB 100331B: Swift/XRT possible afterglow candidate
  17. Swift detection of LS V +44 17
  18. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  19. GRB 100331A: BOOTES-3 observations
  20. Konus-Wind observation of GRB 100324B
  21. Konus-Wind observation of GRB 100322A
  22. GRB 100322A: Suzaku WAM observation of the prompt emission
  23. GRB 100325A: Fermi LAT detection
  24. GROND observations of GRB100316D/SN2010bh
  25. GRB 100324A: GROND observations
  26. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  27. SGR 1833-0832: Swift/UVOT Upper Limits
  28. GRB 100322A: Fermi GBM detection
  29. SGR 1833-0832: Archival Chandra Observations
  30. Possible pulsation period in SGR 1833-0832
  31. Discovery of the Spin Period of SGR 1833-0832
  32. GRB 100316D: ATCA radio observations
  33. Probable SGR 1833-0832: Enhanced Swift-XRT position
  34. GRB 100219A: MASTER-Net optical alert observations
  35. GRB 100319A: Swift detection of a burst; possible SGR
  36. GRB 100316D: Possible Supernova
  37. GRB 100219A: optical upper limit
  38. GRB 100316A: optical observations in CrAO
  39. GRB 100316D: Swift/UVOT Observations
  40. GRB 100316D: Swift XRT enhanced position and further refined analysis
  41. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  42. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  43. GRB 100316D: Gemini/GMOS and VLT/X-shooter observations
  44. GRB 100316D: VLT/X-shooter observations
  45. GRB 100316D: Swift-BAT refined analysis
  46. GRB100316C: Swift/UVOT Upper Limits
  47. GRB 100316B: Swift/UVOT observations
  48. GRB 100316C: Enhanced Swift-XRT position
  49. GRB 100316A: TAROT Calern observatory optical observations
  50. GRB 100316B: Enhanced Swift-XRT position
  51. GRB100316A: Swift/UVOT Upper Limits
  52. Trigger 416140 is almost certainly not a GRB
  53. GRB 100316C: BOOTES-3 observations
  54. GRB 100316D: Swift detection of a burst
  55. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  56. GRB 100316C: Swift detection of a burst
  57. GRB 100316A: Enhanced Swift-XRT position
  58. GRB 100316B: Swift detection of a burst with optical counterpart
  59. GRB100305A: Optical upper limits at IAO
  60. GRB 100305A: Super-LOTIS early observations
  61. GRB100302A : LOAO observations and Lulin afterglow analysis
  62. GRB 100305A: Swift/UVOT Upper Limits
  63. GRB 100305A Optical Observations
  64. GRB 100305A: Enhanced Swift-XRT position
  65. GRB 100305A: Gemini-N OT candidate
  66. GRB 100305A: PAIRITEL NIR Upper Limits
  67. GRB 100305A: P60 Observations
  68. GRB 100305A: Swift detection of a burst
  69. GRB 100302A: Swift/UVOT Upper Limits
  70. GRB 100302A: Gemini-N OT confirmation
  71. GRB 100302A: Optical observations at Crni Vrh
  72. GRB 100302A: MASTER-Net optical alert observations
  73. GRB 1000302A : A possible afterglow candidate
  74. GRB 100302A: Enhanced Swift-XRT position
  75. GRB 100302A: Swift detection of a burst
  76. GRB 100224B: Fermi GBM detection
  77. GRB 100206A: optical observations in CrAO
  78. GRB 100206A: optical observations in Terskol
  79. GRB 100213B: Mondy optical observations
  80. GRB 100219A: optical observations
  81. GRB 100219A: GAO 150cm telescope Optical Observation
  82. GRB 100225A: Fermi LAT detection
  83. GRB
  84. GRB100219A Akeno and Okayama MITSuME Optical Observation
  85. GRB 100219A: GROND observations
  86. GRB 100219A: NOT OA observations
  87. GRB 100219A: Enhanced Swift-XRT position
  88. GRB 100219A: Swift/UVOT Detection of the Optical Afterglow
  89. GRB 100216A: XRT Refined Analysis
  90. GRB 100219A: Pre-explosion imaging and host candidate
  91. GRB 100219A: Swift/UVOT Detection of a Source near the XRT Position
  92. GRB 100219A: Swift detection of a burst
  93. GRB 100216A: Keck imaging
  94. GRB 100213A: Swift-BAT lag analysis indicates probably SHB
  95. GRB 100213B: GRT Optical Observation
  96. GRB 100213A: GRT Optical Observation
  97. GRB 100213B: Enhanced Swift-XRT position
  98. GRB 100213B: Gemini-N Observations
  99. GRB 100213B: Swift/UVOT Upper Limits
  100. GRB 100213A: Swift/UVOT Upper Limits

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