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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"

41758 results found.

  1. GRB 140428B: Fermi GBM observation
  2. Konus-Wind observation of GRB 140428B
  3. GRB 140428A: Swift/UVOT Upper Limits
  4. GRB 140428A: Swift-BAT refined analysis
  5. GRB 140423A: RTT150 optical observations
  6. IPN Triangulation of GRB 140428B (short/hard)
  7. Trigger 597570: Swift detection of SGR 1806-20
  8. GRB 140428A: 1.5m OSN I-band detection
  9. GRB 140428A: Keck redshift estimate
  10. GRB 140428A: Keck detection of a red optical afterglow candidate
  11. GRB 140428A: NOT observations
  12. GRB 140428A: Swift-XRT detection of a source
  13. GRB 140428A: Swift Detection of a Possible Burst
  14. GRB 140423A: MITSuME Akeno upper limits
  15. GRB 140423A Third epoch pODI photometry
  16. GRB 140423A: Continued RATIR Optical and NIR Observations
  17. GRB 140423A: MITSuME Akeno Optical observation
  18. GRB 140413A: GROND Afterglow Confirmation
  19. DG CVn: optical observations
  20. GRB 140423A: RATIR Optical and NIR Observations
  21. GRB 140423A: NOT Afterglow Observations
  22. GRB 140419A: Continued Mondy optical observations
  23. GRB 140423A: Nishi-Harima NIR Observations
  24. GRB 140423A: TNG NIR observations
  25. GRB 140423A pODI/WIYN afterglow photometry
  26. GRB 140423A, Optical Observations
  27. GRB 140423A: Swift-XRT refined Analysis
  28. GRB 140423A: Swift-BAT refined analysis
  29. GRB 140423A: MITSuME Okayama Optical Observation
  30. Swift Trigger 596958 is positionally consistent with V* DG CVn/2XMM J133146.4+291635
  31. Swift Trigger 596958 is probably the flare star: DG CVn
  32. GRB 140423A: Further Observations with Swift/UVOT
  33. GRB 140423A: KAIT Optical Detection
  34. GRB 140423A: Nanshan optical upper limit
  35. GRB 140423A: P60 Observations
  36. GRB 140423A: Fermi GBM observation
  37. GRB 140423A: KWFC z-band photometry
  38. GRB 140423A: Gemini-N redshift
  39. GRB 140419A, LOAO R-band observations
  40. GRB 140423A: ISON-MN early photometry and correction to the GCN circ. 16143
  41. GRB 140423A: Swift/UVOT detection of a possible counterpart
  42. GRB 140423A: Swift-XRT observations
  43. GRB 140423A: ROTSE-III Detection of Optical Counterpart
  44. GRB 140423A optical observations with pODI/WIYN at KPNO
  45. GRB 140423A: optical afterglow candidate
  46. GRB 140423A: Swift detection of a burst
  47. GRB 140419A: Mondy optical observations
  48. GRB 140419A: Refined NOT photometry
  49. GRB 140419A: Continued RATIR Optical and NIR Observations
  50. GRB140419A: NOT optical observations
  51. GRB 140419A: KAIT Refined Analysis
  52. GRB 140419A: Continued RATIR Optical and NIR Observations
  53. Swift Trigger 596641 is not a GRB
  54. Konus-Wind observation of GRB 140419A
  55. GRB 140419A, Optical Observations
  56. GRB 140419A: MITSuME Ishigakijima Optical Observation
  57. GRB 140419A: MITSuME Okayama Optical Observation
  58. GRB 140419A: Swift UVOT refined analysis
  59. GRB 140419A: P60 Observations
  60. GRB 140419A: Swift-XRT refined Analysis
  61. GRB 140419A: Swift-BAT refined analysis
  62. GRB 140419A: Gemini-N redshift
  63. GRB140419A: UVOT detects fading afterglow in white but not in u filter
  64. GRB 140419A: CARMA early 3mm detection
  65. GRB 140419A: RATIR Optical and NIR Observations
  66. GRB 140419A: ROTSE-III Detection of Optical Counterpart
  67. GRB 140419A (Swift trigger 596426) : KAIT optical candidate
  68. GRB 140419A: Swift detection of a burst with optical afterglow
  69. Konus-Wind observation of GRB 140416A
  70. IPN Triangulation of GRB 140416A (long/very intense)
  71. GRB 140416A: Fermi GBM detection
  72. GRB 140414A: Swift/UVOT Upper Limit
  73. GRB 140414A: Swift-XRT observations
  74. GRB 140414A: TNG optical observations
  75. GRB 140414A: Swift-BAT refined analysis
  76. GRB 140414A: Short burst found in ground analysis of BAT slew data
  77. GRB 140413A: Swift/UVOT Observations of the Optical Afterglow
  78. GRB 140412A: Swift/UVOT Upper Limits
  79. Konus-Wind observation of GRB 140413A
  80. GRB 140413A: Swift-XRT refined Analysis
  81. GRB 140413A: Swift-BAT refined analysis
  82. GRB 140412A: Swift-XRT refined Analysis
  83. GRB 140412A: Swift-BAT refined analysis
  84. GRB 140413A: TAROT La Silla observatory optical observations
  85. GRB 140413A: GROND afterglow candidate
  86. Swift Trigger 595616: a possible GRB
  87. GRB 140412A: Swift detection of a burst
  88. GRB 140408A: 1.5m OSN optical upper limit
  89. Swift Trigger 595345 is not an astrophysical source
  90. Swift-BAT trigger 595162 is noise
  91. GRB 140408A: MITSuME Akeno Optical observation
  92. Fermi418277210: iPTF optical observations
  93. GRB 140408A: RATIR Optical Upper Limits
  94. GRB 140408A: Swift-BAT refined analysis
  95. GRB 140408A: GROND Detection of an Afterglow Candidate
  96. GRB 140408A: Swift/UVOT Upper Limits
  97. GRB 140408A: Swift-XRT refined Analysis
  98. GRB 140408A: MITSuME Okayama upper limits
  99. GRB 140408A: Fermi GBM detection
  100. Swift Trigger 595162: a possible GRB

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