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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"

20501 results found.

  1. GRB 100427A: Swift XRT and UVOT Upper Limits
  2. GRB 100414A : EVLA Radio Detection
  3. GRB 100414A : WSRT Radio Detection
  4. GRB 100423A: CrAO optical observations
  5. GRB 100418A: Terskol optical observations
  6. GRB 100424A: CrAO optical observations
  7. GRB 100424A: NIR Afterglow Confirmation
  8. GRB 100424A: Gemini/NIRI H-band observations
  9. GRB100425A: Swift/UVOT Upper Limits
  10. GRB 100424A: Swift/UVOT Upper Limits
  11. GRB 100424A: Liverpool Telescope Upper Limits
  12. GRB 100425A: Enhanced Swift-XRT position
  13. GRB 100425A: GROND afterglow observation
  14. GRB 100424A: Gemini/NIRI Candidate Afterglow
  15. GRB 100424A: D50 optical limits
  16. GRB 100425A: candidate optical afterglow from the VLT
  17. GRB100424A: MITSuME optical upper limits
  18. GRB100423A: MITSuME optical upper limits
  19. GRB 100424A : Lulin early z'-band upper limit
  20. GRB 100424A: GROND Upper Limits
  21. GRB 100424A: PAIRITEL NIR Upper Limits
  22. GRB 100425A: Swift detection of a burst
  23. GRB 100424A: NOT optical observations
  24. GRB 100424A: Enhanced Swift-XRT position
  25. GRB 100424A: Swift detection of a burst
  26. GRB 100420A: GRT Optical Observation
  27. Swift Trigger 420256: D50 optical limits
  28. GRB 100423A: Swift-BAT refined analysis
  29. Swift Trigger 420256: IAC80 R-band observations
  30. Swift Trigger 420256: BOOTES-2 observations
  31. Trigger 420256: Swift detection of a possible GRB
  32. GRB 100423A: GROND discovery of afterglow
  33. GRB100418A: REM possible afterglow detection
  34. GRB 100418A: Continuing Swift/UVOT Observations
  35. GRB100420A: MITSuME optical upper limits
  36. GRB 100414A: CFHT optical observations
  37. GRB 100420A: Swift/UVOT Upper Limits
  38. GRB 100420A: XRT refined analysis
  39. GRB 100420A: Enhanced Swift-XRT position
  40. GRB 100418A: SARA second epoch
  41. GRB 100420A: SARA Upper Limits
  42. GRB 100418A: optical observations
  43. GRB 100418A: SMA submm detection
  44. GRB 100420A: Swift detection of a burst
  45. GRB 100418A: Swift/UVOT Observations
  46. GRB 100418A: Gemini-N redshift confirmation
  47. GRB100418A: VLT/X-shooter redshift and photometry
  48. GRB 100418A: SARA observations
  49. GRB 100418A: GROND observations; missing author list added
  50. GRB 100418A: GROND observations
  51. GRB 100418A: Enhanced Swift-XRT position
  52. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  53. GRB 100414A: Swift/UVOT Observations
  54. GRB 100414A: GROND Detection of the Optical Afterglow
  55. GRB 100414A: Gemini-N candidate and redshift
  56. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  57. GRB 100414A: Palomar Transient Factory Observations
  58. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  59. Konus-Wind observation of GRB 100414B
  60. GRB 100415A: MAXI/GSC detection of a probable GRB
  61. GRB 100414A: Fermi GBM detection
  62. GRB100414A: Fermi LAT detection
  63. GRB 100413A: GROND Upper limits
  64. GRB 100413A: Swift/UVOT Upper Limits
  65. Tentative redshift of GRB100413A from X-ray data
  66. GRB 100413A: SARA upper limit
  67. GRB 100413A: Enhanced Swift-XRT position
  68. GRB 100413A: Swift detection of a burst
  69. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  70. Trigger 419015 is probably not a GRB
  71. GRB100401A: GROND Upper Limits
  72. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  73. GRB 100331B: GROND Upper limits
  74. GRB 100401A: Fermi GBM detection
  75. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  76. GRB 100331B: BOOTES-3 observations
  77. GRB 100331B: Swift/UVOT Upper Limits
  78. GRB 100331B: Swift/XRT possible afterglow candidate
  79. Swift detection of LS V +44 17
  80. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  81. GRB 100331A: BOOTES-3 observations
  82. GRB 100331A: A long GRB detected by INTEGRAL
  83. Short X-ray Transient detected by MAXI/GSC
  84. GRB 100325A: Fermi LAT detection
  85. GROND observations of GRB100316D/SN2010bh
  86. GRB 100324A: GROND observations
  87. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  88. SGR 1833-0832: Swift/UVOT Upper Limits
  89. SGR 1833-0832: Archival Chandra Observations
  90. Possible pulsation period in SGR 1833-0832
  91. Discovery of the Spin Period of SGR 1833-0832
  92. GRB 100316D: ATCA radio observations
  93. Probable SGR 1833-0832: Enhanced Swift-XRT position
  94. GRB 100219A: MASTER-Net optical alert observations
  95. GRB 100319A: Swift detection of a burst; possible SGR
  96. GRB 100316D: Possible Supernova
  97. GRB 100219A: optical upper limit
  98. GRB 100316A: optical observations in CrAO
  99. GRB 100316D: Swift/UVOT Observations
  100. GRB 100316D: Swift XRT enhanced position and further refined analysis

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