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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"

20392 results found.

  1. GRB 100424A: Swift/UVOT Upper Limits
  2. GRB 100424A: Liverpool Telescope Upper Limits
  3. GRB 100425A: Enhanced Swift-XRT position
  4. GRB 100425A: GROND afterglow observation
  5. GRB 100424A: Gemini/NIRI Candidate Afterglow
  6. GRB 100424A: D50 optical limits
  7. GRB 100425A: candidate optical afterglow from the VLT
  8. GRB100424A: MITSuME optical upper limits
  9. GRB100423A: MITSuME optical upper limits
  10. GRB 100424A : Lulin early z'-band upper limit
  11. GRB 100424A: GROND Upper Limits
  12. GRB 100424A: PAIRITEL NIR Upper Limits
  13. GRB 100425A: Swift detection of a burst
  14. GRB 100424A: NOT optical observations
  15. GRB 100424A: Enhanced Swift-XRT position
  16. GRB 100424A: Swift detection of a burst
  17. GRB 100420A: GRT Optical Observation
  18. Swift Trigger 420256: D50 optical limits
  19. GRB 100423A: Swift-BAT refined analysis
  20. Swift Trigger 420256: IAC80 R-band observations
  21. Swift Trigger 420256: BOOTES-2 observations
  22. Trigger 420256: Swift detection of a possible GRB
  23. GRB 100423A: GROND discovery of afterglow
  24. GRB100418A: REM possible afterglow detection
  25. GRB 100418A: Continuing Swift/UVOT Observations
  26. GRB100420A: MITSuME optical upper limits
  27. GRB 100414A: CFHT optical observations
  28. GRB 100420A: Swift/UVOT Upper Limits
  29. GRB 100420A: XRT refined analysis
  30. GRB 100420A: Enhanced Swift-XRT position
  31. GRB 100418A: SARA second epoch
  32. GRB 100420A: SARA Upper Limits
  33. GRB 100418A: optical observations
  34. GRB 100418A: SMA submm detection
  35. GRB 100420A: Swift detection of a burst
  36. GRB 100418A: Swift/UVOT Observations
  37. GRB 100418A: Gemini-N redshift confirmation
  38. GRB100418A: VLT/X-shooter redshift and photometry
  39. GRB 100418A: SARA observations
  40. GRB 100418A: GROND observations; missing author list added
  41. GRB 100418A: GROND observations
  42. GRB 100418A: Enhanced Swift-XRT position
  43. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  44. GRB 100414A: Swift/UVOT Observations
  45. GRB 100414A: GROND Detection of the Optical Afterglow
  46. GRB 100414A: Gemini-N candidate and redshift
  47. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  48. GRB 100414A: Palomar Transient Factory Observations
  49. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  50. Konus-Wind observation of GRB 100414B
  51. GRB 100415A: MAXI/GSC detection of a probable GRB
  52. GRB 100414A: Fermi GBM detection
  53. GRB100414A: Fermi LAT detection
  54. GRB 100413A: GROND Upper limits
  55. GRB 100413A: Swift/UVOT Upper Limits
  56. Tentative redshift of GRB100413A from X-ray data
  57. GRB 100413A: SARA upper limit
  58. GRB 100413A: Enhanced Swift-XRT position
  59. GRB 100413A: Swift detection of a burst
  60. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  61. Trigger 419015 is probably not a GRB
  62. GRB100401A: GROND Upper Limits
  63. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  64. GRB 100331B: GROND Upper limits
  65. GRB 100401A: Fermi GBM detection
  66. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  67. GRB 100331B: BOOTES-3 observations
  68. GRB 100331B: Swift/UVOT Upper Limits
  69. GRB 100331B: Swift/XRT possible afterglow candidate
  70. Swift detection of LS V +44 17
  71. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  72. GRB 100331A: BOOTES-3 observations
  73. GRB 100331A: A long GRB detected by INTEGRAL
  74. Short X-ray Transient detected by MAXI/GSC
  75. GRB 100325A: Fermi LAT detection
  76. GROND observations of GRB100316D/SN2010bh
  77. GRB 100324A: GROND observations
  78. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  79. SGR 1833-0832: Swift/UVOT Upper Limits
  80. SGR 1833-0832: Archival Chandra Observations
  81. Possible pulsation period in SGR 1833-0832
  82. Discovery of the Spin Period of SGR 1833-0832
  83. GRB 100316D: ATCA radio observations
  84. Probable SGR 1833-0832: Enhanced Swift-XRT position
  85. GRB 100219A: MASTER-Net optical alert observations
  86. GRB 100319A: Swift detection of a burst; possible SGR
  87. GRB 100316D: Possible Supernova
  88. GRB 100219A: optical upper limit
  89. GRB 100316A: optical observations in CrAO
  90. GRB 100316D: Swift/UVOT Observations
  91. GRB 100316D: Swift XRT enhanced position and further refined analysis
  92. GRB 100316B: Swift-XRT refined analysis
  93. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  94. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  95. GRB 100316D: Gemini/GMOS and VLT/X-shooter observations
  96. GRB 100316D: VLT/X-shooter observations
  97. GRB100316C: Swift/UVOT Upper Limits
  98. GRB 100316B: Swift/UVOT observations
  99. GRB 100316C: Enhanced Swift-XRT position
  100. GRB 100316A: TAROT Calern observatory optical observations

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