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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"

3533 results found.

  1. IPN Triangulation of GRB 140308A
  2. GRB 140304A: VLA Detection
  3. GRB 140304A: Swift-BAT refined analysis
  4. GRB 140304A: Enhanced Swift-XRT position
  5. GRB 140304A: Swift detection of a burst
  6. Konus-Wind observation of GRB 140215A
  7. Trigger 586482: Swift detection of GROJ1744-28
  8. GRB 140209A: Swift-BAT Spectral lag analysis
  9. GRB 140209A: Swift detection of a burst
  10. GRB 140129B: MASTER OT early light curve
  11. GRB 140129A: P60 optical afterglow detection
  12. GRB 140103A: AAO optical afterglow candidate
  13. Swift-BAT trigger 582894 is HR 1099 (Flare star)
  14. GRB 140103A: Swift-XRT refined analysis
  15. GRB 140102A: MAXI/GSC detection
  16. GRB 131231A: P60 observations
  17. Konus-Wind observation of GRB 131229A
  18. GRB 131229A: CARMA 3mm observations
  19. GRB 131227A: GROND Upper Limits
  20. GRB 131227A: Enhanced Swift-XRT position
  21. GRB 131227A: OT candidate from KAIT Optical observations
  22. Trigger 581129: Swift-BAT triggered on noise
  23. GRB 131127B: rejection of optical counterpart candidates
  24. GRB 131128A; Fermi GBM observation
  25. GRB 131128A: AROMA-N Optical Observation
  26. GRB 131128A: T100 observations
  27. GRB 131128A: MASTER-Net optical observations
  28. GRB 131127B: Nanshan optical observations
  29. IPN Triangulation of GRB 131127B
  30. Fermi407254341: iPTF optical afterglow candidates
  31. GRB 131122A: Nanshan optical upper limit
  32. GRB 131108A: 1.23m CAHA optical candidate
  33. GRB 131028A: Fermi GBM detection
  34. GRB 131024A: Skynet R-COP optical observations
  35. GRB 131024A: Swift detection of a burst
  36. GRB 131014A: Suzaku WAM observation of the prompt emission
  37. GRB 131002B: Swift detection of a burst
  38. GRB 130925A: continuing Swift/XRT monitoring
  39. GRB 130702A: RTT150 optical observations
  40. GRB 130913A detected in ground analysis of Swift-BAT data
  41. GRB 130912A: P60 Observations
  42. GRB 130912A: Swift detection of a short burst
  43. GRB 130828A: Further Swift XRT observations
  44. GRB 130831A: ISON-Kislovodsk optical observations
  45. GRB 130903A: GROND Afterglow Discovery
  46. GRB 130831A, Swift-BAT refined analysis
  47. IPN triangulation of GRB 130828A - error box
  48. IPN triangulation of GRB 130828A
  49. GRB 130828A: Fermi GBM detection
  50. GRB 130828A: Fermi-LAT detection of a burst
  51. GRB 130816A, Swift-BAT refined analysis
  52. GRB 130816B: Swift detection of a burst
  53. IPN Triangulation of GRB 130812B (long/soft)
  54. IPN localization of GRB 130804A
  55. GRB 130803A: Swift detection of a burst
  56. GRB 130727A: Swift detection of a burst
  57. GRB 130725B: Swift trigger time correction
  58. GRB 130719A: Skynet/PROMPT observations
  59. Swift Trigger 563980 is GRB 130725A
  60. GRB 130702A: CARMA 3mm detection
  61. GRB 130628A: Fermi GBM detection
  62. GRB 130701A: MITSuME Akeno Optical observation
  63. GRB 130701A, Swift-BAT refined analysis
  64. GRB 130701A: optical afterglow from the NOT
  65. Swift trigger 559221 is likely a false trigger coincident with IGR J17544-2619
  66. GRB 130627A: Fermi GBM detection
  67. GRB 130610A: CrAO optical observations
  68. GRB 130610A: iTelescope T21 optical observations
  69. GRB 130612A: ISON-NM optical observations
  70. GRB 130612A: VLT/X-shooter redshift
  71. GRB 130610A: Swift/UVOT Observations
  72. GRB 130610A: Fermi GBM Observation
  73. GRB 130610A: Skynet/PROMPT detection of the optical afterglow
  74. GRB 130610A - Liverpool Telescope Optical Afterglow Confirmation
  75. GRB 130610A: Swift detection of a burst with an optical counterpart
  76. GRB 130603A: AAO optical observations
  77. GRB 130605A: Swift-BAT refined analysis
  78. GRB 130603B: VLT/X-shooter redshift confirmation
  79. GRB 130603B: Afterglow detection from NOT
  80. GRB 130603B: WHT optical afterglow candidate
  81. GRB 130528A: Fermi GBM detection
  82. GRB 130527A: Suzaku WAM observation of the prompt emission
  83. GRB 130528A: optical upper limit
  84. GRB 130527A: NOT optical counterpart
  85. GRB 130521A, Swift-BAT refined analysis
  86. GRB 130521A: TAROT La Silla observatory optical observations
  87. GRB 130518A Swift-BAT position from ground analysis
  88. Refined IPN Triangulation of GRB 130502B
  89. GRB 130504C: Fermi GBM detection
  90. GRB 130505A: Swift detection of a burst with optical afterglow
  91. GRB 130427A: KAIT optical observations
  92. GRB 130427A: Continued Skynet/PROMPT Observations
  93. GRB 130427A: further GMG observations
  94. GRB 130427A: CrAO RT-22 36 GHz observation
  95. GRB 130427B: MITSuME Ishigakijima upper limits
  96. GRB 130427A: MITSuME Okayama and Ishigakijima Optical Observation after 1 day
  97. GRB 130427A: Skynet/PROMPT Observations
  98. GRB 130427A: CARMA 3mm observations
  99. GRB 130427B: Tentative VLT/X-shooter redshift
  100. GRB 130427A : Xinglong TNT optical observation

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