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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"

21908 results found.

  1. GRB 130812A: Enhanced Swift-XRT position
  2. GRB 130812A: Swift detection of a burst
  3. GRB130807A: Swift/UVOT observations
  4. GRB 130806A: Swift/UVOT Upper Limits
  5. GRB 130807A: Swift detection of a GRB or Galactic transient
  6. Konus-Wind observation of GRB 130804A
  7. GRB 130623A: GROND detection of the optical/NIR afterglow
  8. GRB 130806A: MITSuME Akeno Optical observation
  9. GRB 130806A: MITSuME Okayama upper limits
  10. GRB 130806A, Swift-BAT refined analysis
  11. IPN localization of GRB 130804A
  12. GRB130803A: GROND observations
  13. GRB 130806A: Enhanced Swift-XRT position
  14. GRB 130806A: Swift detection of a burst
  15. Trigger 565443: Swift detection of a burst from SGR J1745-29
  16. GRB 130803A: RATIR Optical and NIR Observations
  17. GRB130803A: GROND detection of possible host
  18. GRB 130803A: Swift/UVOT Upper Limits
  19. GRB 130803A: Enhanced Swift-XRT position
  20. GRB 130803A: Faulkes Telescope South Observations
  21. GRB 130803A: Swift detection of a burst
  22. GRB 130727A: Watcher optical limit
  23. GRB 130722A: RATIR Optical Observations
  24. GRB 130727A: Swift/UVOT Detection
  25. GRB 130727A: GROND observations
  26. GRB 130727A: Enhanced Swift-XRT position
  27. GRB 130727A: Swift-BAT refined analysis
  28. GRB 130727A: Swift-XRT observations
  29. GRB 130727A: Swift-XRT and Swift-UVOT prompt observations
  30. GRB 130725B: Swift/UVOT Observations
  31. GRB 130725A: Swift-XRT refined Analysis
  32. GRB 130725B: Swift-XRT refined Analysis
  33. GRB130725B: REM-ROS2 optical observations
  34. GRB 130725B - UVOT-enhanced XRT position
  35. GRB 130725A: Swift/UVOT Upper Limits
  36. GRB 130725A - Faulkes Telescope South Observations
  37. GRB 130725B: GROND Detection of the Optical/NIR Afterglow
  38. GRB 130725A: MITSuME Ishigakijima Optical Observation
  39. GRB 130725B: Swift/UVOT Detection of an Optical Counterpart
  40. GRB 130725A, Swift-BAT refined analysis
  41. GRB 130719A: Skynet/PROMPT observations
  42. Swift Trigger 563980 is GRB 130725A
  43. Konus-Wind observation of GRB 130722A
  44. GRB 130722A: Swift/UVOT Detection
  45. GRB 130722A: MITSuME Okayama upper limits
  46. GRB 130722A: Enhanced Swift-XRT position
  47. GRB 130722A: Skynet/GORT observations
  48. GRB 130715A: Suzaku WAM observation of the prompt emission
  49. GRB 130722A: Swift detection of a burst
  50. GRB 130716A: Gemini-North imaging
  51. GRB 130716A: UVOT Upper Limits
  52. GRB 130716A: Probable short-hard burst with delayed Swift data
  53. GRB 130626A: Retraction of possible X-ray afterglow
  54. GRB 130708A: Swift XRT and UVOT Observations
  55. GRB 130702A: TNG spectroscopic observations of the emerging supernova
  56. GRB 130702A: P200 Spectroscopic Confirmation of Associated Supernova
  57. GRB 130628A: Suzaku WAM observation of the prompt emission
  58. GRB130702A: NOT observation - the detection of an emerging supernova
  59. GRB 130702A: Continued RATIR Optical and NIR Observations
  60. GRB 130702A: Xinglong TNT optical observation
  61. GRB 130702A: Continued UVOT Observations
  62. GRB 130702Ð
  63. GRB 130702A: WSRT radio detection
  64. GRB 130702A: NOT spectroscopy and redshift of the nearby bright galaxy
  65. GRB 130702A: RATIR Optical and NIR Observations
  66. GRB 130702A: NOT optical observations
  67. GRB 130702A / Fermi394416326 : Nanshan optical observations
  68. Fermi GRB 130702A: Swift XRT and UVOT observations
  69. GRB 130702A / Fermi394416326 : Fermi-LAT detection of a burst
  70. Fermi GBM trigger 394416326: MASTER early optical limit
  71. GRB 130628A: Fermi GBM detection
  72. Fermi394416326: FTN detection
  73. Fermi394416326: iPTF detection of a possible optical afterglow
  74. GRB 130623A: Second Swift-XRT observation
  75. GRB 130701A: MITSuME Akeno Optical observation
  76. GRB 130701A, Swift-BAT refined analysis
  77. Konus-Wind observation of GRB 130701A
  78. GRB 130701A: Swift/UVOT Detection
  79. GRB 130701A: Enhanced Swift-XRT position
  80. GRB 130701A: optical afterglow from the NOT
  81. GRB 130701A: Swift detection of a burst
  82. GRB 130627B: Swift/UVOT Upper Limits
  83. GRB 130627A: Swift/UVOT Upper Limits
  84. Swift trigger 559221 is likely a false trigger coincident with IGR J17544-2619
  85. GRB 130627A: Enhanced Swift-XRT position
  86. GRB 130626A: RATIR Optical Observations
  87. GRB 130627B: Swift-XRT observations
  88. GRB 130626A: Swift-XRT possible detection and UVOT upper limits
  89. GRB 130627A: Swift-XRT observations
  90. GRB 130626A: Swift detection of a short burst
  91. GRB 130625A: Swift-XRT refined Analysis
  92. GRB 130625A: MASTER afterglow limit
  93. GRB 130625A: Swift/UVOT Upper Limits
  94. GRB 130625A: Nanshan optical upper limit
  95. GRB 130623A: Swift-XRT and UVOT observations
  96. GRB 130625A: Enhanced Swift-XRT position
  97. GRB 130625A: Swift detection of a burst
  98. GRB 130614A: Suzaku WAM observation of the prompt emission
  99. Swift Trigger 558631 is not a real source
  100. GRB 130609B: Suzaku WAM observation of the prompt emission

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