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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"

37679 results found.

  1. GRB 160419A, Swift-BAT refined analysis
  2. GRB 160419A: Fermi GBM detection
  3. GRB 160419A: Swift detection of a burst
  4. Fermi GBM trigger 482632364/160418023 is not a GRB
  5. GRB 160417A: GMG observations
  6. GRB 160417A: Swift-BAT refined analysis
  7. GRB 160417A: Swift/UVOT Detection
  8. GRB 160417A: iTelescope T11 optical observations
  9. GRB 160417A: Swift-XRT refined Analysis
  10. GRB 160417A: MITSuME Okayama upper limits
  11. GRB 160417A: Enhanced Swift-XRT position
  12. GRB 160417A: KAIT optical afterglow confirmation
  13. GRB 160417A: Swift detection of a burst with an optical counterpart
  14. GRB 160412A: GROND upper limits
  15. GRB 160411A - Gemini-S afterglow candidate
  16. Konus-Wind observation of GRB 160409A
  17. GRB 160410A: SMARTS optical/IR observations
  18. GRB 160410A: TLS Tautenburg observations
  19. GRB 160412A: Swift/UVOT Upper Limits
  20. Swift Trigger 682614 is not a GRB
  21. GRB 160410A: JCMT SCUBA-2 sub-mm observation
  22. GRB 160409A: Swift-XRT observations
  23. GRB 160409A found in Swift BAT ground analysis
  24. GRB 160412A: Swift-XRT refined Analysis
  25. GRB 160411A: Swift-BAT refined analysis of the short burst
  26. GRB 160412A: Swift-BAT refined analysis
  27. GRB 160410A: further NOT optical observations
  28. GRB 160412A: Enhanced Swift-XRT position
  29. GRB 160412A: Swift detection of a burst
  30. GRB 160408A: CALET Gamma-Ray Burst Monitor detection
  31. GRB 160409A: Swift ToO observations
  32. GRB 160410A: NOT observations of the afterglow
  33. GRB 160408A: 6.0 GHz VLA upper limit
  34. GRB 160411A: Gemini-S optical observations
  35. GRB 160411A: GROND Optical/NIR upper limits
  36. GRB 160411A: Swift/UVOT Upper Limits
  37. GRB 160410A: UKIRT near-IR upper limits
  38. GRB 160411A: Fermi GBM detection
  39. Konus-Wind observation of GRB 160410A (short/hard)
  40. GRB 160410A: TAROT La Silla observatory early optical observations
  41. GRB 160411A: Swift-XRT refined Analysis
  42. GRB 160410A: MITSuME Akeno optical upper limits
  43. GRB 160411A: MASTER-NET early optical observations.
  44. GRB 160411A: Enhanced Swift-XRT position
  45. GRB 160410A: Swift-XRT refined Analysis
  46. GRB 160411A: Swift-XRT observations
  47. GRB 160410A: GMG observation
  48. GRB 160411A: Swift detection of a short burst
  49. GRB 160410A: Keck-I/LRIS redshift
  50. GRB 160410A: Skynet PROMPT-CTIO observations of the optical afterglow
  51. GRB 160410A: Swift-BAT refined analysis of the short GRB
  52. GRB 160410A: Swift/UVOT Detection
  53. GRB 160410A: VLT/X-shooter redshift
  54. GRB 160410A: Enhanced Swift-XRT position
  55. GRB 160410A: GROND optical detection
  56. GRB 160410A: Swift detection of a (possibly-short) burst with an optical counterpart
  57. GRB 160408A: GMG observation limit
  58. GRB 160408A: Gemini afterglow confirmation
  59. GRB 160408A: TLS Tautenburg observations
  60. GRB 160408A: Swift/UVOT Upper Limits
  61. GRB 160408A: Swift-XRT refined Analysis
  62. GRB 160408A: Fermi GBM detection
  63. GRB 160406A: Fermi GBM observation
  64. GRB 160408A: Swift-BAT refined analysis
  65. GRB 160408A: Gemini optical observations
  66. GRB 160408A: Enhanced Swift-XRT position
  67. GRB 160408A: Swift detection of a short burst
  68. IPN Triangulation of GRB 160406A (short/hard)
  69. GRB 160401A: Swift-XRT observations
  70. GRB 160401A: Swift/UVOT Upper Limits
  71. GRB 160401A: Zadko observatory - Gingin optical observations
  72. GRB 160401A: LT observations
  73. GRB 160401A: Swift ToO observations
  74. GRB 160401A: MASTER-IAC prompt optical observations
  75. GRB 160401A: a long GRB detected by INTEGRAL
  76. GRB 160327A: Continued RATIR Optical and NIR Observations
  77. GRB 160324A: CALET Gamma-Ray Burst Monitor detection
  78. GRB 160327A: Early RAPTOR Limits
  79. GRB 160327A: JCMT SCUBA-2 sub-mm observation
  80. GRB 160327A: Imaging and spectroscopy from GTC
  81. Konus-Wind observation of GRB 160325A
  82. GRB 160327A: Continued RATIR Optical and NIR Observations
  83. GRB 160327A: KAIT optical afterglow confirmation
  84. GRB 160327A: Mondy optical upper limit
  85. GRB 160327A: Swift-BAT refined analysis
  86. GRB 160327A: Swift/UVOT Upper Limits
  87. GRB 160327A: Swift-XRT refined Analysis
  88. GRB 160327A: Enhanced Swift-XRT position
  89. GRB 160327A: RATIR Optical and NIR Afterglow Detection
  90. GRB 160327A: Swift detection of a burst
  91. GRB 160325A, Swift-BAT refined analysis
  92. GRB 160325A: GROND Upper Limits
  93. GRB 160325A: Swift-XRT refined Analysis
  94. GRB 160325A: Further Swift/UVOT Observations
  95. GRB 160325A: afterglow confirmation
  96. GRB 160325A: Enhanced Swift-XRT position
  97. GRB 160325A: Fermi-LAT detection
  98. Swift Trigger 680457 is not a GRB
  99. GRB 160325A: Fermi GBM detection
  100. GRB160325A: REM NIR observations

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