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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"

43854 results found.

  1. IPN triangulation of GRB 140508A
  2. GRB 140508A: Fermi GBM detection
  3. Konus-Wind observation of GRB 140506A
  4. GRB 140502A: ISON-NM early optical limit
  5. GRB 140506A: Fermi GBM Detection
  6. GRB 140506A: Swift/UVOT Detection
  7. GRB 140506A: Swift-BAT refined analysis
  8. GRB 140506A: VLT/X-shooter spectroscopy
  9. GRB 140506A: Swift-XRT refined Analysis
  10. GRB 140506A: Enhanced Swift-XRT position
  11. GRB 140506A: Swift detection of a burst with an optical counterpart
  12. Konus-Wind observation of GRB 140423A
  13. GRB 140430A: iTelescope.Net T16 Optical Observation
  14. GRB 140430A: r'-band STELLA-I observations
  15. GRB 140502A: Swift/UVOT Upper Limits
  16. GRB 140502A: Swift-BAT refined analysis
  17. GRB 140502A: Swift-XRT refined Analysis
  18. GRB 140502A: Enhanced Swift-XRT position
  19. GRB 140430A: BVR-band IAC80 observations
  20. Swift Trigger 597860 is probably not a GRB
  21. GRB 140502A: Fermi GBM observation
  22. GRB 140502A: Swift detection of a burst
  23. GRB 140430A: Swift-BAT refined analysis
  24. GRB 140501A: Fermi GBM detection
  25. GRB 140430A: Swift/UVOT Observations
  26. GRB 140430A: Swift-XRT refined Analysis
  27. GRB 140430A: VATT Optical Observations
  28. GRB 140430A: Enhanced Swift-XRT position
  29. GRB 140430A: VLT/X-shooter redshift
  30. GRB 140430A: NOT optical observations
  31. GRB 140430A : Liverpool Telescope optical afterglow observations
  32. GRB 140428A: GROND observations
  33. GRB140430A: Swift detection of a burst with an optical counterpart
  34. GRB 140428B: Fermi GBM observation
  35. Konus-Wind observation of GRB 140428B
  36. GRB 140428A: Swift-BAT refined analysis
  37. GRB 140423A: RTT150 optical observations
  38. IPN Triangulation of GRB 140428B (short/hard)
  39. Trigger 597570: Swift detection of SGR 1806-20
  40. GRB 140428A: 1.5m OSN I-band detection
  41. GRB 140428A: Keck redshift estimate
  42. GRB 140428A: Keck detection of a red optical afterglow candidate
  43. GRB 140428A: NOT observations
  44. GRB 140428A: Swift-XRT detection of a source
  45. GRB 140428A: Swift Detection of a Possible Burst
  46. GRB 140423A Third epoch pODI photometry
  47. GRB 140423A: Continued RATIR Optical and NIR Observations
  48. GRB 140413A: GROND Afterglow Confirmation
  49. DG CVn: optical observations
  50. GRB 140423A: RATIR Optical and NIR Observations
  51. GRB 140423A: NOT Afterglow Observations
  52. GRB 140419A: Continued Mondy optical observations
  53. GRB 140423A: Nishi-Harima NIR Observations
  54. GRB 140423A: TNG NIR observations
  55. GRB 140423A pODI/WIYN afterglow photometry
  56. GRB 140423A: Swift-XRT refined Analysis
  57. GRB 140423A: Swift-BAT refined analysis
  58. Swift Trigger 596958 is positionally consistent with V* DG CVn/2XMM J133146.4+291635
  59. Swift Trigger 596958 is probably the flare star: DG CVn
  60. GRB 140423A: KAIT Optical Detection
  61. GRB 140423A: Enhanced Swift-XRT position
  62. GRB 140423A: Nanshan optical upper limit
  63. GRB 140423A: P60 Observations
  64. GRB 140423A: Fermi GBM observation
  65. GRB 140423A: Gemini-N redshift
  66. GRB 140419A, LOAO R-band observations
  67. GRB 140423A: ISON-MN early photometry and correction to the GCN circ. 16143
  68. GRB 140423A: Swift/UVOT detection of a possible counterpart
  69. GRB 140423A: Swift-XRT observations
  70. GRB 140423A: ROTSE-III Detection of Optical Counterpart
  71. GRB 140423A optical observations with pODI/WIYN at KPNO
  72. GRB 140423A: optical afterglow candidate
  73. GRB 140423A: Swift detection of a burst
  74. GRB 140419A: Mondy optical observations
  75. GRB 140419A: Refined NOT photometry
  76. GRB 140419A: Continued RATIR Optical and NIR Observations
  77. GRB140419A: NOT optical observations
  78. GRB 140419A: KAIT Refined Analysis
  79. GRB 140419A: Continued RATIR Optical and NIR Observations
  80. Swift Trigger 596641 is not a GRB
  81. Konus-Wind observation of GRB 140419A
  82. GRB 140419A: Swift UVOT refined analysis
  83. GRB 140419A: P60 Observations
  84. GRB 140419A: Swift-XRT refined Analysis
  85. GRB 140419A: Swift-BAT refined analysis
  86. GRB 140419A: T24 optical observations
  87. GRB 140419A: Gemini-N redshift
  88. GRB 140419A: Enhanced Swift-XRT position
  89. GRB140419A: UVOT detects fading afterglow in white but not in u filter
  90. GRB 140419A: CARMA early 3mm detection
  91. GRB 140419A: RATIR Optical and NIR Observations
  92. GRB 140419A: ROTSE-III Detection of Optical Counterpart
  93. GRB 140419A (Swift trigger 596426) : KAIT optical candidate
  94. GRB 140419A: Swift detection of a burst with optical afterglow
  95. Konus-Wind observation of GRB 140416A
  96. IPN Triangulation of GRB 140416A (long/very intense)
  97. GRB 140416A: Fermi GBM detection
  98. GRB 140414A: Swift/UVOT Upper Limit
  99. GRB 140414A: Swift-XRT observations
  100. GRB 140414A: TNG optical observations

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