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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"

26767 results found.

  1. GRB 140129A: CARMA early observations
  2. GRB 140129B, Swift-BAT refined analysis (probably not a short burst)
  3. GRB 140129A: P200 spectroscopy
  4. GRB140129A: RAPTOR Observations of the Early Afterglow
  5. GRB 140129A, Swift-BAT refined analysis
  6. GRB 140129A: Swift/UVOT Observations
  7. GRB 140129A: Swift-XRT refined Analysis
  8. GRB 140129B: MASTER OT confirmation
  9. GRB 140129B: Swift detection of a burst with an optical afterglow
  10. GRB 140129A: ROTSE-III Detection of Optical Counterpart
  11. GRB 140129A: RATIR Optical and NIR Observations
  12. GRB 140129A: P60 optical afterglow detection
  13. GRB 140129A: Swift detection of a burst with an optical afterglow
  14. GRB 140122A/Fermi412093190: MASTER-Net early optical observations
  15. Fermi412093190: iPTF optical counterpart search
  16. GRB 140110A: Second Follow-up Swift-XRT Observation
  17. Correction: MAXI J1421-613: Skynet PROMPT/R-COP observations
  18. GRB 140118A/MAXI J1421-613: Skynet PROMPT/R-COP observations
  19. GRB 140118A: RATIR Optical and NIR Observations
  20. GRB 140118A: Fermi GBM observation
  21. GRB 140118A, Swift-BAT refined analysis
  22. Swift Trigger 584155 is MAXI J1421-613
  23. GRB 140118A: Swift detection of a burst
  24. GRB 140110A: Further Swift-XRT Observation
  25. GRB 140103A: MASTER-Net early OT detection
  26. GRB 140103A: optical upper limit
  27. GRB 140108A: Mondy optical observations, refined analysis
  28. GRB 140114A: Continued RATIR Optical and NIR Observations
  29. GRB 140114A: ROTSE-III Optical Limits
  30. GRB 140114A: Swift-XRT refined Analysis
  31. GRB 140114A: Swift-BAT refined analysis
  32. GRB 140114A: Swift/UVOT Upper Limits
  33. GRB 140104B: Further Swift XRT observations
  34. GRB 140114A: RATIR Optical and NIR Afterglow Detection
  35. Fermi Gamma-ray Burst Monitor trigger 411362827 is not a GRB
  36. GRB 140114A: P60 Observations
  37. GRB 140114A: Swift detection of a burst
  38. IPN Triangulation of GRB 140110A
  39. GRB 140110A: Swift/UVOT Observations
  40. GRB 140108A: Suzaku WAM observation of the prompt emission
  41. GRB 140110A: Swift XRT observations
  42. GRB 140108A BAT refined analysis update *CORRECTION*
  43. GRB 140108A BAT refined analysis update
  44. GRB 140110A: Fermi GBM observation
  45. GRB 140110A: Fermi-LAT detection of a burst
  46. GRB 140105A: MASTER-Net early optical observations and time correction
  47. GRB 140108A: Swift-BAT refined analysis
  48. GRB 140108A: Fermi GBM detection
  49. GRB 140108A: Swift/UVOT Detection
  50. GRB 140108A: theoretical prediction of redshift and of supernova occurrence
  51. GRB 140108A: Swift-XRT refined Analysis
  52. GRB 140108A: Mondy optical observations
  53. GRB 140108A: D50+BART optical candidate detection
  54. GRB 140108A: MASTER-Net OT detection
  55. GRB 140108A: Swift detection of a burst
  56. New Fermi-LAT GRB Table
  57. Swift-BAT triggered on KS 1947+300
  58. GRB 140103A: Swift XRT afterglow confirmation
  59. GRB 140105A/Fermi410578384: MASTER-Net early optical observations
  60. GRB 140104B: Swift XRT observations
  61. GRB 140102A: Swift/UVOT Detection
  62. LOAO R-band Observation of GRB 140102A
  63. GRB 140105A: Fermi GBM detection
  64. GRB 140104B: Fermi GBM observation
  65. Fermi410578384: iPTF optical afterglow candidates for a possible short GRB
  66. GRB 140102A: BOOTES-4 early optical observations
  67. GRB 140104B: Fermi-LAT detection of a burst
  68. GRB 140103A: Lulin Optical r-band Observations
  69. Swift-BAT trigger 582894 is HR 1099 (Flare star)
  70. GRB140104A : Xinglong TNT observation. A bright star is located nearby
  71. GRB 140102A, Optical Observations
  72. GRB 140103A: P60 Observations
  73. GRB 140102A: P60 observations
  74. GRB 131231A: Swift/UVOT Observations of the Optical Afterglow
  75. GRB 140103A: Swift/UVOT Upper Limits
  76. GRB 140102A: Fermi/GBM Observation
  77. GRB 131229A: Suzaku WAM observation of the prompt emission
  78. Konus-Wind observation of GRB 140102A
  79. GRB 140103A: Swift-XRT refined analysis
  80. GRB 140102A: GROND observations
  81. GRB 140103A, Swift-BAT refined analysis
  82. GRB 140102A: MAXI/GSC detection
  83. GRB 140102A, Swift-BAT refined analysis
  84. GRB 140102A: Swift-XRT refined Analysis
  85. GRB 140103A: MASTER-Net optical observations
  86. GRB 140102A: Fermi-LAT detection of a burst
  87. GRB 140103A: Swift detection of a burst
  88. GRB 140102A: Early optical observations from Nanshan
  89. GRB 131224B detected in ground analysis of Swift-BAT data
  90. GRB 140102A: Swift detection of a burst with optical counterpart
  91. GRB 131231A: Gemini-South Redshift
  92. GRB 131229A: Fermi GBM detection
  93. GRB 131231A: Swift-XRT observations
  94. GRB 131231A: Fermi GBM detection
  95. GRB 131231A: iPTF optical afterglow candidate coincident with Nanshan detection
  96. GRB 131231A: afterglow confirmation from the NOT
  97. GRB 131231A: Nanshan afterglow candidate
  98. GRB 131231A: Fermi-LAT detection of a burst
  99. Konus-Wind observation of GRB 131229A
  100. GRB 131229A: Magellan upper limit

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