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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"

27320 results found.

  1. GRB 140213A: Continued Skynet R-COP/PROMPT Observations of the Optical Afterglow
  2. GRB 140215A: RAPTOR Observations During Gamma-Ray Emitting Interval
  3. GRB 140213A: Continued Skynet R-COP/PROMPT Detections of a Rebrightening Optical Afterglow
  4. GRB 140215A: Continued Skynet PROMPT Observations of the Optical Afterglow
  5. GRB 140211A: Khureltogot optical upper limits
  6. GRB 140215A: Continued RATIR Optical and NIR Observations
  7. Konus-Wind observation of GRB 140213A
  8. GRB 140215A: Swift/UVOT Detection
  9. GRB 140215A: Continued RATIR Optical and NIR Observations
  10. GRB 140215A: MITSuME Okayama Optical Observation
  11. GRB 140215A: Swift-BAT refined analysis
  12. GRB 140215A: ISON-NM optical observations
  13. GRB 140215A: Swift-XRT refined Analysis
  14. GRB 140215A: Enhanced Swift-XRT position
  15. GRB 140215A: RATIR Optical and NIR Observations
  16. GRB 140215A: Swift detection of a burst with optical counterpart
  17. GRB 140213A: Swift-BAT refined analysis
  18. GRB140206A: Discovery Channel Telescope Optical Detection
  19. GRB 140213A: Swift-XRT refined Analysis
  20. GRB 140213A: Enhanced Swift-XRT position
  21. GRB 140213A: GROND Detection of the Optical/NIR Afterglow
  22. GRB 140213A: Skynet R-COP Detection of Optical Afterglow
  23. GRB 140213A: Swift-XRT observations
  24. GRB 140213A: Swift/UVOT Detection
  25. GRB 140213A: Swift detection of a burst
  26. Trigger 586482: Swift detection of GROJ1744-28
  27. GRB 140211A: Swift-BAT refined analysis
  28. GRB 140209A: Swift-XRT observations
  29. Konus-Wind observation of GRB 140209A
  30. GRB 140211A: MITSuME Okayama upper limits
  31. GRB 140211A: Swift detection of a burst
  32. GRB 140209A: Early RAPTOR Optical Detection
  33. GRB 140206A: Bassano Bresciano Observatory optical upper limit
  34. GRB 140209A, Swift-BAT refined analysis
  35. GRB 140209A: optical observations
  36. GRB 140206A, Swift-BAT refined analysis
  37. GRB 140206A: MITSuME Akeno detection of the optical counterpart
  38. GRB 140206A: TNG redshift confirmation
  39. GRB 140206A: Optical Observations via Virtual Telescope
  40. GRB 140206A: NOT redshift
  41. GRB 140206A: TNG optical observations
  42. GRB 140206A: Swift-XRT refined Analysis
  43. GRB 140206A: T100 observations
  44. GRB 140206A: Fermi GBM detection
  45. GRB 140206A: Swift/UVOT Detection
  46. GRB 140206A: theoretical prediction of redshift and of supernova occurrence
  47. GRB 140206A: Enhanced Swift-XRT position
  48. GRB 140206A: ISON-Ussuriysk optical observations
  49. GRB 140206B: Fermi-LAT detection
  50. GRB 140206B: Fermi GBM detection
  51. GRB 140206A: Nanshan optical observations
  52. GRB 140206A: Swift/UVOT optical detection
  53. GRB 140206A: Swift detection of a burst
  54. GRB 140129A: 5 GHz VLA observations
  55. GRB 140129A: Continued RATIR Optical and NIR Observations
  56. GRB 140129A: Khureltogot optical limit
  57. GRB 140129B: Swift/UVOT Detection
  58. GRB 140129A: Continued RATIR Optical and NIR Observations
  59. GRB 140102A: MITSuME Akeno Optical observation
  60. GRB 140129B: Swift-XRT refined Analysis
  61. GRB 140129B: MASTER OT early light curve
  62. GRB 140129B, Swift-BAT refined analysis (probably not a short burst)
  63. GRB140129A: RAPTOR Observations of the Early Afterglow
  64. GRB 140129A: MITSuME Okayama upper limits
  65. GRB 140129B: Enhanced Swift-XRT position
  66. GRB 140129A, Swift-BAT refined analysis
  67. GRB 140129A: Swift/UVOT Observations
  68. GRB 140129A: Swift-XRT refined Analysis
  69. GRB 140129B: Swift detection of a burst with an optical afterglow
  70. GRB 140129A: Enhanced Swift-XRT position
  71. GRB 140129A: RATIR Optical and NIR Observations
  72. GRB 140129A: Swift detection of a burst with an optical afterglow
  73. GRB 140122A/Fermi412093190: MASTER-Net early optical observations
  74. Fermi412093190: iPTF optical counterpart search
  75. GRB 140110A: Second Follow-up Swift-XRT Observation
  76. GRB 140114A: optical upper limit
  77. Correction: MAXI J1421-613: Skynet PROMPT/R-COP observations
  78. Konus-Wind observation of GRB 131215A
  79. GRB 140118A/MAXI J1421-613: Skynet PROMPT/R-COP observations
  80. GRB 140118A: RATIR Optical and NIR Observations
  81. GRB 140118A: Fermi GBM observation
  82. GRB 140118A, Swift-BAT refined analysis
  83. Swift Trigger 584155 is MAXI J1421-613
  84. GRB 140110A: Further Swift-XRT Observation
  85. GRB 140103A: optical upper limit
  86. GRB 140114A: NOT afterglow observations
  87. GRB 140114A: Continued RATIR Optical and NIR Observations
  88. GRB 140114A: MITSuME Okayama upper limits
  89. GRB 140114A: ROTSE-III Optical Limits
  90. GRB 140114A: Swift-XRT refined Analysis
  91. GRB 140114A: Swift-BAT refined analysis
  92. GRB 140114A: Swift/UVOT Upper Limits
  93. GRB 140103A: AAO optical afterglow candidate
  94. GRB 140104B: Further Swift XRT observations
  95. GRB 140114A: Enhanced Swift-XRT position
  96. GRB 140114A: RATIR Optical and NIR Afterglow Detection
  97. GRB 140102A: AAO optical upper limits
  98. GRB 140114A: Swift detection of a burst
  99. GRB 140108A: Konkoly optical observations
  100. GRB 140110A: Swift/UVOT retraction of UVOT candidates

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