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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"

39471 results found.

  1. GRB 140508A: WHT spectroscopy
  2. GRB 140509A: Swift detection of a burst with an optical counterpart
  3. GRB 140508A: NOT photometry and spectroscopy
  4. GRB 140508A: SAO RAS and MASTER photometric and spectroscopic observations
  5. GRB 140508A: 1.23m CAHA BVRI-band observations
  6. GRB 140508A: iPTF optical transient candidate
  7. IPN triangulation of GRB 140508A
  8. GRB 140508A: Fermi GBM detection
  9. Konus-Wind observation of GRB 140506A
  10. GRB 140430A: MITSuME Akeno upper limits
  11. GRB 140502A: ISON-NM early optical limit
  12. GRB 140506A: Fermi GBM Detection
  13. GRB 140506A: Swift/UVOT Detection
  14. GRB 140506A: Swift-BAT refined analysis
  15. GRB 140506A: VLT/X-shooter spectroscopy
  16. GRB 140506A: Swift-XRT refined Analysis
  17. GRB 140506A: Enhanced Swift-XRT position
  18. GRB 140506A: Swift detection of a burst with an optical counterpart
  19. Konus-Wind observation of GRB 140423A
  20. GRB 140430A: iTelescope.Net T16 Optical Observation
  21. GRB 140430A: r'-band STELLA-I observations
  22. GRB 140502A: Swift/UVOT Upper Limits
  23. GRB 140502A: MITSuME Okayama upper limits
  24. GRB 140502A: Swift-BAT refined analysis
  25. GRB 140502A: Swift-XRT refined Analysis
  26. GRB 140502A: Enhanced Swift-XRT position
  27. GRB 140430A: BVR-band IAC80 observations
  28. Swift Trigger 597860 is probably not a GRB
  29. GRB 140502A: Fermi GBM observation
  30. GRB 140502A: Swift detection of a burst
  31. GRB 140430A: Further VATT Optical Observations
  32. GRB 140430A: Swift-BAT refined analysis
  33. GRB 140501A: Fermi GBM detection
  34. GRB 140430A: Swift/UVOT Observations
  35. GRB 140430A: Swift-XRT refined Analysis
  36. GRB 140430A: VATT Optical Observations
  37. GRB 140430A: Enhanced Swift-XRT position
  38. GRB 140430A: VLT/X-shooter redshift
  39. GRB 140430A: NOT optical observations
  40. GRB 140430A : Liverpool Telescope optical afterglow observations
  41. GRB 140428A: GROND observations
  42. GRB140430A: Swift detection of a burst with an optical counterpart
  43. GRB 140428B: Fermi GBM observation
  44. Konus-Wind observation of GRB 140428B
  45. GRB 140428A: Swift/UVOT Upper Limits
  46. GRB 140428A: Swift-BAT refined analysis
  47. GRB 140423A: RTT150 optical observations
  48. IPN Triangulation of GRB 140428B (short/hard)
  49. Trigger 597570: Swift detection of SGR 1806-20
  50. GRB 140428A: 1.5m OSN I-band detection
  51. GRB 140428A: Keck redshift estimate
  52. GRB 140428A: Keck detection of a red optical afterglow candidate
  53. GRB 140428A: NOT observations
  54. GRB 140428A: Swift-XRT detection of a source
  55. GRB 140428A: Swift Detection of a Possible Burst
  56. GRB 140423A: MITSuME Akeno upper limits
  57. GRB 140423A Third epoch pODI photometry
  58. GRB 140423A: Continued RATIR Optical and NIR Observations
  59. GRB 140423A: MITSuME Akeno Optical observation
  60. GRB 140413A: GROND Afterglow Confirmation
  61. DG CVn: optical observations
  62. GRB 140423A: RATIR Optical and NIR Observations
  63. GRB 140423A: NOT Afterglow Observations
  64. GRB 140419A: Continued Mondy optical observations
  65. GRB 140423A: Nishi-Harima NIR Observations
  66. GRB 140423A: TNG NIR observations
  67. GRB 140423A pODI/WIYN afterglow photometry
  68. GRB 140423A, Optical Observations
  69. GRB 140423A: Kanata/HONIR Optical and NIR Observations
  70. GRB 140423A: Swift-XRT refined Analysis
  71. GRB 140423A: Swift-BAT refined analysis
  72. GRB 140423A: MITSuME Okayama Optical Observation
  73. Swift Trigger 596958 is positionally consistent with V* DG CVn/2XMM J133146.4+291635
  74. Swift Trigger 596958 is probably the flare star: DG CVn
  75. GRB 140423A: Further Observations with Swift/UVOT
  76. GRB 140423A: KAIT Optical Detection
  77. GRB 140423A: Enhanced Swift-XRT position
  78. GRB 140423A: Nanshan optical upper limit
  79. GRB 140423A: P60 Observations
  80. GRB 140423A: Fermi GBM observation
  81. GRB 140423A: KWFC z-band photometry
  82. GRB 140423A: Gemini-N redshift
  83. GRB 140419A, LOAO R-band observations
  84. GRB 140423A: ISON-MN early photometry and correction to the GCN circ. 16143
  85. GRB 140423A: Swift/UVOT detection of a possible counterpart
  86. GRB 140423A: Swift-XRT observations
  87. GRB 140423A: ROTSE-III Detection of Optical Counterpart
  88. GRB 140423A optical observations with pODI/WIYN at KPNO
  89. GRB 140423A: optical afterglow candidate
  90. GRB 140423A: Swift detection of a burst
  91. GRB 140419A: Mondy optical observations
  92. GRB 140419A: Refined NOT photometry
  93. GRB 140419A: Continued RATIR Optical and NIR Observations
  94. GRB140419A: NOT optical observations
  95. GRB 140419A: KAIT Refined Analysis
  96. GRB 140419A: Continued RATIR Optical and NIR Observations
  97. Swift Trigger 596641 is not a GRB
  98. Konus-Wind observation of GRB 140419A
  99. GRB 140419A, Optical Observations
  100. GRB 140419A: MITSuME Ishigakijima Optical Observation

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