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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"

28259 results found.

  1. GRB 130806A: MITSuME Okayama upper limits
  2. GRB130803A: GROND observations
  3. GRB 130806A: Enhanced Swift-XRT position
  4. GRB 130806A: Swift detection of a burst
  5. Trigger 565443: Swift detection of a burst from SGR J1745-29
  6. GRB 130803A: Swift-XRT refined Analysis
  7. GRB 130803A: RATIR Optical and NIR Observations
  8. GRB130803A: GROND detection of possible host
  9. GRB 130803A: Swift/UVOT Upper Limits
  10. GRB 130803A; Fermi GBM observation
  11. GRB 130803A: Enhanced Swift-XRT position
  12. GRB 130803A: Faulkes Telescope South Observations
  13. GRB 130603B: Second epoch of HST WFC/F160W imaging
  14. GRB 130803A: Swift detection of a burst
  15. GRB 130727A: Watcher optical limit
  16. GRB 130727A: Swift/UVOT Detection
  17. GRB 130727A: Swift-XRT refined Analysis
  18. GRB 130727A: Fermi GBM detection
  19. GRB 130727A: GROND observations
  20. GRB 130727A: Enhanced Swift-XRT position
  21. GRB 130727A: Faulkes Telescope South optical afterglow
  22. GRB 130727A: Swift-XRT observations
  23. GRB 130727A: Swift-XRT and Swift-UVOT prompt observations
  24. GRB 130727A: Swift detection of a burst
  25. GRB 130725B: Swift/UVOT Observations
  26. GRB 130725A: Swift-XRT refined Analysis
  27. GRB 130725B: Swift-XRT refined Analysis
  28. GRB130725B: REM-ROS2 optical observations
  29. GRB 130725B - UVOT-enhanced XRT position
  30. GRB 130725A: Swift/UVOT Upper Limits
  31. GRB 130725A - Faulkes Telescope South Observations
  32. GRB 130725B: GROND Detection of the Optical/NIR Afterglow
  33. GRB 130725A: MITSuME Ishigakijima Optical Observation
  34. GRB 130725B: Swift/UVOT Detection of an Optical Counterpart
  35. GRB 130719A: Skynet/PROMPT observations
  36. GRB 130725B: Swift detection of a burst
  37. Swift Trigger 563980 is GRB 130725A
  38. Retraction of GCN Circ. 15020 (GRB 130722C Tiled Swift observations)
  39. GRB 130722A: Swift/UVOT Detection
  40. GRB 130722A: MITSuME Okayama upper limits
  41. GRB 130722C Tiled Swift observations
  42. GRB 130722A: Enhanced Swift-XRT position
  43. GRB 130722A: Swift-XRT refined Analysis
  44. GRB 130722A: Skynet/GORT observations
  45. GRB 130722A: Swift detection of a burst
  46. GRB 130719A: Swift detection of a burst
  47. GRB 130702A : Xinglong TNT continue optical observation
  48. GRB 130716A: Gemini-North imaging
  49. GRB 130716A: UVOT Upper Limits
  50. GRB 130716A: Probable short-hard burst with delayed Swift data
  51. GRB 130715A: Fermi GBM detection
  52. GRB 130626A: Retraction of possible X-ray afterglow
  53. GRB 130702A: Maidanak optical observations
  54. GMRT radio detection of GRB 130702A
  55. GRB 130708A: Swift XRT and UVOT Observations
  56. GRB 130702A: P200 Spectroscopic Confirmation of Associated Supernova
  57. GRB 130708A found in ground analysis of Swift-BAT data
  58. GRB 130702A: Maidanak optical observations
  59. GRB130702A: NOT observation - the detection of an emerging supernova
  60. GRB 130702A: VLA detection
  61. GRB 130702A: WSRT radio detection
  62. Konus-Wind observation of GRB 130702A
  63. GRB130702A: Redshift of Afterglow Candidate iPTF13bxl
  64. GRB 130702A: further TNG observations
  65. GRB 130702A: NOT spectroscopy and redshift of the nearby bright galaxy
  66. GRB 130702A: further Swift-XRT observations
  67. GRB 130702A: Continued P60 observations
  68. GRB 130702A: CARMA 3mm detection
  69. GRB 130702A: NOT optical observations
  70. GRB 130702A: TNG optical observations
  71. Fermi GRB 130702A: Swift XRT and UVOT observations
  72. GRB 130702A / Fermi394416326: Fermi GBM detection
  73. GRB 130702A / Fermi394416326 : Fermi-LAT detection of a burst
  74. GRB 130628A: Fermi GBM detection
  75. Fermi394416326: FTN detection
  76. Fermi394416326: iPTF detection of a possible optical afterglow
  77. GRB 130627B: Swift afterglow confirmation
  78. GRB 130623A: Second Swift-XRT observation
  79. GRB 130701A: MITSuME Akeno Optical observation
  80. GRB 130701B: Fermi GBM detection
  81. GRB 130701A: Swift-XRT refined Analysis
  82. GRB 130701A: P60 Observations
  83. GRB 130701A: Swift/UVOT Detection
  84. GRB 130701A: VLT/X-shooter redshift
  85. GRB 130701A: Enhanced Swift-XRT position
  86. GRB 130701A: optical afterglow from the NOT
  87. GRB 130701A: Swift detection of a burst
  88. GRB 130627B: Swift/UVOT Upper Limits
  89. GRB 130627A: Swift/UVOT Upper Limits
  90. GRB 130627A: Swift-XRT refined Analysis
  91. GRB 130627B: Possible Swift-XRT afterglow detection
  92. Swift trigger 559221 is likely a false trigger coincident with IGR J17544-2619
  93. GRB 130627A: Enhanced Swift-XRT position
  94. GRB 130626A: KAIT Optical Observations
  95. GRB 130626A: RATIR Optical Observations
  96. GRB 130627A: Fermi GBM detection
  97. GRB 130623A: Fermi GBM detection
  98. GRB130627B: Swift/UVOT Observations
  99. GRB 130627B: Swift-XRT observations
  100. GRB 130626A: Swift-XRT possible detection and UVOT upper limits

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