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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"

43854 results found.

  1. GRB 090817: Swift/UVOT Upper Limits
  2. GRB 090812: Konus-Wind and Swift/BAT joint spectral analysis
  3. GRB 090813: I-band observations from 1.5m OSN telescope
  4. GRB 090817: Swift-XRT observations
  5. GRB 090814A: optical observations
  6. GRB 090813: Suzaku WAM observation of the prompt emission
  7. GRB 090812: Suzaku WAM observation of the prompt emission
  8. GRB 090817: a long GRB localized by INTEGRAL
  9. VLA radio non-detection of GRB 090812
  10. GRB 090815B: Fermi GBM detection
  11. GRB 090815: Fermi GBM detection
  12. GRB 090813: CrAO optical obsevations
  13. GRB 090814B: Confirmation of the X-ray afterglow
  14. GRB090814A: NOT optical follow-ups
  15. GRB 090814B: I-band observations from 1.23m CAHA telescope
  16. GRB 090814B: Swift/UVOT Upper Limits
  17. GRB 090814B: Liverpool Telescope Observations
  18. Fermi Gamma-ray Burst Monitor trigger 271934815 is not a GRB
  19. GRB 090814C: Fermi GBM detection
  20. GRB 090814B: Swift-XRT detection of a possible afterglow.
  21. GRB 090814A: Swift-XRT Team Refined Analysis
  22. GRB 090814A: Swift-BAT refined analysis
  23. GRB090814A: VLT spectroscopy
  24. GRB 090814: Enhanced Swift-XRT position
  25. GRB 090814B: a long GRB localized by INTEGRAL
  26. GRB 090814: GROND Detection of an Optical Afterglow Candidate
  27. GRB 090814: Swift detection of a burst
  28. GRB 090813: Fermi GBM observation
  29. Fermi Gamma-ray Burst Monitor trigger 271446248 is not a GRB
  30. GRB 090813: Swift-XRT refined analysis
  31. Fermi Gamma-ray Burst Monitor trigger 271833016 is not a GRB
  32. GRB 090813, Swift-BAT refined analysis
  33. Konus-Wind observations of GRB090813
  34. GRB090813: Swift/UVOT upper limits
  35. GRB 090813: Enhanced Swift-XRT position
  36. GRB 090813: Liverpool Telescope afterglow confirmation
  37. GRB 090813: P60 Optical Afterglow Confirmation
  38. GRB 090813: optical candidate from 1.23m CAHA telescope
  39. GRB 090813: Swift detection of a burst
  40. GRB 090812: WIRO NIR upper limit
  41. GRB 090812: Faulkes Telescope South Continued Optical Monitoring
  42. GRB 090812: RAPTOR detections during the burst
  43. GRB 090812: Swift XRT refined analysis
  44. GRB 090812 Swift-BAT Refined Analysis
  45. GRB090812: Swift/UVOT observations
  46. GRB 090812: GROND Observations of the Optical/NIR Afterglow
  47. GRB 090812: Enhanced Swift-XRT position
  48. GRB 090812 VLT redshift
  49. GRB 090812: Liverpool Telescope afterglow confirmation
  50. GRB 090812: P60 Confirmation of Optical Afterglow
  51. GRB 090812: Swift detection of a burst with an optical counterpart
  52. GRB 090807B: Fermi GBM detection
  53. GRB 090809: Further NOT optical observations
  54. VLA radio upper limit on GRB 090809
  55. GRB 090621B: MAGIC telescope GeV observation
  56. GRB 090621A: MAGIC telescope GeV observation
  57. GRB 090809: WHT observations
  58. GRB 090809 X-shooter redshift
  59. GRB 090809B: Fermi GBM detection
  60. GRB 090809: Swift-XRT refined analysis
  61. GRB090809: Swift/UVOT observations
  62. GRB 090809: Enhanced Swift-XRT position
  63. GRB 090809: Swift-BAT refined analysis
  64. GRB 090809: afterglow confirmation at the NOT
  65. GRB 090809: Swift detection of a burst with a possible optical counterpart
  66. GRB 090807: Liverpool Telescope observations
  67. GRB 090807: Swift/UVOT Upper Limits
  68. GRB 090807: Swift-XRT refined analysis
  69. GRB 090807, Swift-BAT refined analysis
  70. GRB 090807: Enhanced Swift-XRT position
  71. GRB 090807: Swift detection of a burst
  72. Fermi Gamma-ray Burst Monitor trigger 271275771 is not a GRB
  73. GRB 090802B: Fermi GBM detection
  74. IPN Triangulation and Konus-Wind observaions of GRB090727B
  75. GRB 090802: Fermi GBM detection
  76. GRB 090726: optical observation
  77. Swift-BAT trigger 358760 is most likely not a GRB
  78. Swift trigger 358760 is probably a noise event
  79. GRB 090717A: Suzaku WAM observation of the prompt emission
  80. GRB 090709A : Quick look analysis of the Suzaku observation
  81. GRB 090728: Swift-BAT refined analysis
  82. GRB 090727: GRT Optical Observation
  83. GRB 090728: Swift XRT refined analysis
  84. GRB 090727: optical observations
  85. GRB 090726: GRT Optical Observation
  86. GRB 090727: Swift/UVOT Upper Limits
  87. GRB 090728: Enhanced Swift-XRT position
  88. GRB 090727: I-band observations from 1.23m CAHA
  89. GRB 090728A: Faulkes Telescope North Optical Afterglow Candidate
  90. GRB 090728: Swift detection of a burst
  91. GRB 090727: Swift-BAT refined analysis
  92. GRB 090727: Swift-XRT refined analysis
  93. GRB 090727: Liverpool Telescope Afterglow Confirmation and Optical Flare
  94. GRB 090727: Enhanced Swift-XRT position
  95. GRB 090715B: Late-time Lick 3m observations
  96. GRB 090727: Liverpool Telescope possible OT candidate
  97. GRB 090727: Swift detection of a burst
  98. GRB 090726, Swift-BAT refined analysis
  99. GRB 090726: Afterglow candidate photometryfrom Crni Vrh
  100. GRB 090711: Fermi GBM detection

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