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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"

28231 results found.

  1. GRB130725B: REM-ROS2 optical observations
  2. GRB 130725B - UVOT-enhanced XRT position
  3. GRB 130725A: Swift/UVOT Upper Limits
  4. GRB 130725A - Faulkes Telescope South Observations
  5. GRB 130725B: GROND Detection of the Optical/NIR Afterglow
  6. GRB 130725A: MITSuME Ishigakijima Optical Observation
  7. GRB 130725B: Swift/UVOT Detection of an Optical Counterpart
  8. GRB 130725A, Swift-BAT refined analysis
  9. GRB 130719A: Skynet/PROMPT observations
  10. Swift Trigger 563980 is GRB 130725A
  11. Konus-Wind observation of GRB 130722A
  12. GRB 130722A: Swift/UVOT Detection
  13. GRB 130722A: MITSuME Okayama upper limits
  14. GRB 130722A: Enhanced Swift-XRT position
  15. GRB 130722A: Swift-XRT refined Analysis
  16. GRB 130722A: Skynet/GORT observations
  17. GRB 130719A, Swift-BAT refined analysis
  18. GRB 130715A: Suzaku WAM observation of the prompt emission
  19. GRB 130722A: Swift detection of a burst
  20. GRB 130719A: Swift detection of a burst
  21. GRB 130716A: Gemini-North imaging
  22. GRB 130716A: UVOT Upper Limits
  23. GRB 130716A: Probable short-hard burst with delayed Swift data
  24. GRB 130715A: Fermi GBM detection
  25. GRB 130626A: Retraction of possible X-ray afterglow
  26. GRB 130708A: Swift XRT and UVOT Observations
  27. GRB 130708A: Fermi GBM observation
  28. GRB 130708A found in ground analysis of Swift-BAT data
  29. GRB 130628A: Suzaku WAM observation of the prompt emission
  30. GRB130702A: NOT observation - the detection of an emerging supernova
  31. GRB 130702A: Continued RATIR Optical and NIR Observations
  32. GRB 130702A: Continued UVOT Observations
  33. GRB 130702Ð
  34. Konus-Wind observation of GRB 130702A
  35. GRB 130702A: NOT spectroscopy and redshift of the nearby bright galaxy
  36. GRB 130702A: RATIR Optical and NIR Observations
  37. GRB 130702A: NOT optical observations
  38. GRB 130702A / Fermi394416326 : Nanshan optical observations
  39. Fermi GRB 130702A: Swift XRT and UVOT observations
  40. GRB 130702A / Fermi394416326: Fermi GBM detection
  41. GRB 130702A / Fermi394416326 : Fermi-LAT detection of a burst
  42. Fermi GBM trigger 394416326: MASTER early optical limit
  43. GRB 130628A: Fermi GBM detection
  44. Fermi394416326: FTN detection
  45. Fermi394416326: iPTF detection of a possible optical afterglow
  46. GRB 130623A: Second Swift-XRT observation
  47. GRB 130701A: MITSuME Akeno Optical observation
  48. GRB 130701B: Fermi GBM detection
  49. GRB 130701A: Swift-XRT refined Analysis
  50. GRB 130701A: P60 Observations
  51. GRB 130701A, Swift-BAT refined analysis
  52. GRB 130701A: Swift/UVOT Detection
  53. GRB 130701A: Enhanced Swift-XRT position
  54. GRB 130701A: optical afterglow from the NOT
  55. GRB 130701A: Swift detection of a burst
  56. GRB 130627B, Swift-BAT refined analysis
  57. GRB 130627A, Swift-BAT refined analysis
  58. GRB 130627B: Swift/UVOT Upper Limits
  59. GRB 130627A: Swift/UVOT Upper Limits
  60. GRB 130627A: Swift-XRT refined Analysis
  61. Swift trigger 559221 is likely a false trigger coincident with IGR J17544-2619
  62. GRB 130627A: Enhanced Swift-XRT position
  63. GRB 130626A: RATIR Optical Observations
  64. GRB 130626A, Swift-BAT refined analysis
  65. GRB 130627B: Swift-XRT observations
  66. GRB 130626A: Swift-XRT possible detection and UVOT upper limits
  67. GRB 130627A: Swift-XRT observations
  68. GRB 130626A: Swift detection of a short burst
  69. GRB 130625A: Swift-XRT refined Analysis
  70. GRB 130625A: Swift/UVOT Upper Limits
  71. GRB 130625A: Nanshan optical upper limit
  72. GRB 130623A: Swift-XRT and UVOT observations
  73. GRB 130625A: Swift-BAT refined analysis
  74. GRB 130625A: Enhanced Swift-XRT position
  75. GRB 130625A: Swift detection of a burst
  76. GRB 130623A detected in ground analysis of Swift-BAT data
  77. GRB 130614A: Suzaku WAM observation of the prompt emission
  78. Swift Trigger 558631 is not a real source
  79. GRB 130612A: Swift-BAT refined analysis
  80. GRB 130609B: Suzaku WAM observation of the prompt emission
  81. GRB 130612A: Continued Skynet/PROMPT/GORT/DSO observations
  82. Trigger 558399: Swift detection of the Soft Gamma Repeater AXP 1E1547.0-5408
  83. GRB 130615A: Continued Skynet/PROMPT Observations
  84. GRB 130610A: TAROT La Silla observatory optical observations
  85. GRB 130610A: CrAO optical observations
  86. GRB 130615A: Zadko observatory - Gingin optical observations
  87. GRB 130615A: TAROT La Silla observatory optical observations
  88. GRB 130615A: Swift-XRT refined Analysis
  89. GRB 130614A: Fermi GBM detection
  90. GRB 130615A: Swift/UVOT Upper Limits
  91. GRB 130615A: Skynet/PROMPT Observations
  92. GRB 130615A: Enhanced Swift-XRT position
  93. GRB 130615A: Swift-BAT refined analysis
  94. GRB 130615A: GROND afterglow candidate
  95. GRB 130615A: Swift detection of a burst
  96. GRB 130612A: Fermi GBM observation
  97. GRB 130603B: Detection of possible afterglow/kilonova in HST observations
  98. GRB 130606B: Suzaku WAM observation of the prompt emission
  99. GRB 130612A: ISON-NM optical observations
  100. GRB 130612A: MITSuME Okayama upper limits

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