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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"

20554 results found.

  1. GRB130807A: Swift/UVOT observations
  2. GRB 130807A: Swift-XRT refined analysis
  3. GRB 130806A: Swift/UVOT Upper Limits
  4. GRB 130807A: Swift detection of a GRB or Galactic transient
  5. GRB 130623A: GROND detection of the optical/NIR afterglow
  6. GRB 130806A: MITSuME Akeno Optical observation
  7. GRB 130806A: MITSuME Okayama upper limits
  8. IPN localization of GRB 130804A
  9. GRB130803A: GROND observations
  10. GRB 130806A: Enhanced Swift-XRT position
  11. GRB 130806A: Swift detection of a burst
  12. Trigger 565443: Swift detection of a burst from SGR J1745-29
  13. GRB 130803A: RATIR Optical and NIR Observations
  14. GRB130803A: GROND detection of possible host
  15. GRB 130803A: Swift/UVOT Upper Limits
  16. GRB 130803A: Enhanced Swift-XRT position
  17. GRB 130803A: Faulkes Telescope South Observations
  18. GRB 130803A: Swift detection of a burst
  19. GRB 130727A: Watcher optical limit
  20. GRB 130722A: RATIR Optical Observations
  21. GRB 130727A: Swift/UVOT Detection
  22. GRB 130727A: GROND observations
  23. GRB 130727A: Enhanced Swift-XRT position
  24. GRB 130727A: Swift-XRT observations
  25. GRB 130727A: Swift-XRT and Swift-UVOT prompt observations
  26. GRB 130725B: Swift/UVOT Observations
  27. GRB 130725A: Swift-XRT refined Analysis
  28. GRB 130725B: Swift-XRT refined Analysis
  29. GRB130725B: REM-ROS2 optical observations
  30. GRB 130725B - UVOT-enhanced XRT position
  31. GRB 130725A: Swift/UVOT Upper Limits
  32. GRB 130725A - Faulkes Telescope South Observations
  33. GRB 130725B: GROND Detection of the Optical/NIR Afterglow
  34. GRB 130725A: MITSuME Ishigakijima Optical Observation
  35. GRB 130725B: Swift/UVOT Detection of an Optical Counterpart
  36. GRB 130725A, Swift-BAT refined analysis
  37. GRB 130719A: Skynet/PROMPT observations
  38. Swift Trigger 563980 is GRB 130725A
  39. GRB 130722A: Swift/UVOT Detection
  40. GRB 130722A: MITSuME Okayama upper limits
  41. GRB 130722A: Enhanced Swift-XRT position
  42. GRB 130722A: Skynet/GORT observations
  43. GRB 130722A: Swift detection of a burst
  44. GRB 130716A: Gemini-North imaging
  45. GRB 130716A: UVOT Upper Limits
  46. GRB 130716A: Probable short-hard burst with delayed Swift data
  47. GRB 130626A: Retraction of possible X-ray afterglow
  48. GRB 130708A: Swift XRT and UVOT Observations
  49. GRB 130702A: TNG spectroscopic observations of the emerging supernova
  50. GRB 130702A: Maidanak optical observations
  51. GRB130702A: NOT observation - the detection of an emerging supernova
  52. GRB 130702A: Continued RATIR Optical and NIR Observations
  53. GRB 130702A: Continued UVOT Observations
  54. GRB 130702Ð
  55. GRB 130702A: WSRT radio detection
  56. GRB 130702A: NOT spectroscopy and redshift of the nearby bright galaxy
  57. GRB 130702A: RATIR Optical and NIR Observations
  58. GRB 130702A: NOT optical observations
  59. GRB 130702A / Fermi394416326 : Nanshan optical observations
  60. Fermi GRB 130702A: Swift XRT and UVOT observations
  61. GRB 130702A / Fermi394416326 : Fermi-LAT detection of a burst
  62. Fermi GBM trigger 394416326: MASTER early optical limit
  63. GRB 130628A: Fermi GBM detection
  64. Fermi394416326: FTN detection
  65. Fermi394416326: iPTF detection of a possible optical afterglow
  66. GRB 130623A: Second Swift-XRT observation
  67. GRB 130701A: MITSuME Akeno Optical observation
  68. Konus-Wind observation of GRB 130701A
  69. GRB 130701A: Swift/UVOT Detection
  70. GRB 130701A: Enhanced Swift-XRT position
  71. GRB 130701A: optical afterglow from the NOT
  72. GRB 130701A: Swift detection of a burst
  73. GRB 130627A, Swift-BAT refined analysis
  74. GRB 130627B: Swift/UVOT Upper Limits
  75. GRB 130627A: Swift/UVOT Upper Limits
  76. Swift trigger 559221 is likely a false trigger coincident with IGR J17544-2619
  77. GRB 130627A: Enhanced Swift-XRT position
  78. GRB 130626A: RATIR Optical Observations
  79. GRB 130623A: Fermi GBM detection
  80. GRB 130627B: Swift-XRT observations
  81. GRB 130626A: Swift-XRT possible detection and UVOT upper limits
  82. GRB 130627A: Swift-XRT observations
  83. GRB 130626A: Swift detection of a short burst
  84. GRB 130625A: Swift/UVOT Upper Limits
  85. GRB 130625A: Nanshan optical upper limit
  86. GRB 130623A: Swift-XRT and UVOT observations
  87. GRB 130625A: Enhanced Swift-XRT position
  88. GRB 130625A: Swift detection of a burst
  89. GRB 130623A detected in ground analysis of Swift-BAT data
  90. Swift Trigger 558631 is not a real source
  91. GRB 130612A: Continued Skynet/PROMPT/GORT/DSO observations
  92. Trigger 558399: Swift detection of the Soft Gamma Repeater AXP 1E1547.0-5408
  93. GRB 130615A: Continued Skynet/PROMPT Observations
  94. GRB 130610A: TAROT La Silla observatory optical observations
  95. GRB 130610A: CrAO optical observations
  96. GRB 130615A: Zadko observatory - Gingin optical observations
  97. GRB 130615A: TAROT La Silla observatory optical observations
  98. GRB 130615A: Swift/UVOT Upper Limits
  99. GRB 130615A: Skynet/PROMPT Observations
  100. GRB 130615A: Enhanced Swift-XRT position

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