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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"
  1. GRB 140206B: Fermi-LAT detection
  2. GRB 140206B: Fermi GBM detection
  3. GRB 140206A: Nanshan optical observations
  4. GRB 140206A: MASTER OT detection
  5. GRB 140206A: Swift/UVOT optical detection
  6. GRB140206A - Optical afterglow candidate
  7. GRB140206A: a long GRB detected by INTEGRAL
  8. GRB 140206A: Swift detection of a burst
  9. GRB 140129A: 5 GHz VLA observations
  10. GRB 140129A: Continued RATIR Optical and NIR Observations
  11. GRB 140129A: Khureltogot optical limit
  12. GRB 140129B: Swift/UVOT Detection
  13. GRB 140129A: Continued RATIR Optical and NIR Observations
  14. GRB 140102A: MITSuME Akeno Optical observation
  15. GRB 140129B: Swift-XRT refined Analysis
  16. GRB 140129B: MASTER OT early light curve
  17. GRB 140129A: CARMA early observations
  18. GRB 140129B, Swift-BAT refined analysis (probably not a short burst)
  19. GRB 140129A: P200 spectroscopy
  20. GRB140129A: RAPTOR Observations of the Early Afterglow
  21. GRB 140129A: MITSuME Okayama upper limits
  22. GRB 140129B: Enhanced Swift-XRT position
  23. GRB 140129A, Swift-BAT refined analysis
  24. GRB 140129A: Swift/UVOT Observations
  25. GRB 140129A: Swift-XRT refined Analysis
  26. GRB 140129B: MASTER OT confirmation
  27. GRB 140129B: Swift detection of a burst with an optical afterglow
  28. GRB 140129A: Enhanced Swift-XRT position
  29. GRB 140129A: ROTSE-III Detection of Optical Counterpart
  30. GRB 140129A: RATIR Optical and NIR Observations
  31. GRB 140129A: P60 optical afterglow detection
  32. GRB 140129A: Swift detection of a burst with an optical afterglow
  33. GRB 140122A/Fermi412093190: MASTER-Net early optical observations
  34. Fermi412093190: iPTF optical counterpart search
  35. GRB 140110A: Second Follow-up Swift-XRT Observation
  36. GRB 140114A: optical upper limit
  37. Correction: MAXI J1421-613: Skynet PROMPT/R-COP observations
  38. Konus-Wind observation of GRB 131215A
  39. GRB 140118A/MAXI J1421-613: Skynet PROMPT/R-COP observations
  40. GRB 140118A: RATIR Optical and NIR Observations
  41. GRB 140118A: Fermi GBM observation
  42. GRB 140118A, Swift-BAT refined analysis
  43. Swift Trigger 584155 is MAXI J1421-613
  44. GRB 140118A: Swift detection of a burst
  45. GRB 140110A: Further Swift-XRT Observation
  46. GRB 140103A: MASTER-Net early OT detection
  47. GRB 140103A: optical upper limit
  48. GRB 140108A: Mondy optical observations, refined analysis
  49. GRB 140114A: NOT afterglow observations
  50. GRB 140114A: Continued RATIR Optical and NIR Observations
  51. GRB 140114A: MITSuME Okayama upper limits
  52. GRB 140114A: ROTSE-III Optical Limits
  53. GRB 140114A: Swift-XRT refined Analysis
  54. GRB 140114A: Swift-BAT refined analysis
  55. GRB 140114A: Swift/UVOT Upper Limits
  56. GRB 140114A: KAIT Optical Upper Limit
  57. GRB 140103A: AAO optical afterglow candidate
  58. GRB 140104B: Further Swift XRT observations
  59. GRB 140114A: Enhanced Swift-XRT position
  60. GRB 140114A: RATIR Optical and NIR Afterglow Detection
  61. Fermi Gamma-ray Burst Monitor trigger 411362827 is not a GRB
  62. GRB 140102A: AAO optical upper limits
  63. GRB 140114A: P60 Observations
  64. GRB 140114A: Swift detection of a burst
  65. GRB 140108A: Konkoly optical observations
  66. GRB 140110A: Swift/UVOT retraction of UVOT candidates
  67. IPN Triangulation of GRB 140110A
  68. GRB 140110A: Swift/UVOT Observations
  69. GRB 140108A: Suzaku WAM observation of the prompt emission
  70. GRB 140104B: Suzaku WAM observation of the prompt emission
  71. GRB 140110A: Swift XRT observations
  72. GRB 140110A: Reported UVOT OT not GRB afterglow
  73. GRB 140110A: OT detection in Swift/UVOT imaging
  74. GRB 140108A BAT refined analysis update *CORRECTION*
  75. GRB 140108A BAT refined analysis update
  76. GRB 140110A: Fermi GBM observation
  77. GRB 140110A Tiled Swift observations
  78. GRB 140110A: Fermi-LAT detection of a burst
  79. GRB 140108A: Mondy optical upper limit
  80. GRB 140105A: MASTER-Net early optical observations and time correction
  81. GRB 131231A: AAO optical observations
  82. GRB 140108A: Swift-BAT refined analysis
  83. GRB 140108A: Fermi GBM detection
  84. GRB 140108A: Swift/UVOT Detection
  85. GRB 140108A: theoretical prediction of redshift and of supernova occurrence
  86. GRB 140108A: Swift-XRT refined Analysis
  87. GRB 140108A: Enhanced Swift-XRT position
  88. GRB 140108A: Mondy optical observations
  89. GRB 140108A: D50+BART optical candidate detection
  90. GRB 140108A: 1.23m CAHA observations
  91. GRB 140108A: MASTER-Net OT detection
  92. GRB 140108A: Prompt enhanced Swift-XRT position
  93. GRB 140108A: Swift detection of a burst
  94. New Fermi-LAT GRB Table
  95. GRB 140105A: HCT Observations
  96. GRB 140105A: continued iPTF observations and rejection of optical candidates
  97. Swift-BAT triggered on KS 1947+300
  98. GRB 140105A: Swift XRT observations
  99. GRB 140103A: Swift XRT afterglow confirmation
  100. GRB 140105A/Fermi410578384: MASTER-Net early optical observations

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