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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"

5186 results found.

  1. LIGO/Virgo G298048: GROND photometry of candidate optical counterpart reveals brightening in the NIR
  2. LIGO/Virgo G298048: Rapid Evolution of Possible Counterpart
  3. LIGO/Virgo G298048: New MASTER observations of the OT in NGC 4993
  4. LIGO/Virgo G298048: REM optical/NIR observations
  5. LIGO/Virgo G298048: Subaru HSC follow-up observations
  6. LIGO/Virgo G297595: Subaru Hyper Suprime-Cam follow-up observations
  7. LIGO/Virgo G297595: REM optical/NIR observations
  8. GRB 170813A: Swift-XRT refined Analysis
  9. GRB 170810A: Swift-XRT refined Analysis
  10. LIGO/Virgo G296853: no INTEGRAL data at the time of the event
  11. LIGO/Virgo G296853: Fermi-LAT search for high-energy gamma-ray counterpart
  12. GRB 170804A: Swift-XRT refined Analysis
  13. GRB 170803A: Swift-XRT refined Analysis
  14. GRB 170728A: Swift-XRT refined Analysis
  15. GRB 170728B: Swift-XRT refined Analysis
  16. GRB 170714A: z-band afterglow candidate for OSIRIS/GTC
  17. Fermi GBM Detection of possible burst from AXP 4U 0142+61
  18. GRB 170711A: Swift-XRT refined Analysis
  19. GRB 170710A: Swift-XRT refined Analysis
  20. GRB 170705A: Swift-XRT refined Analysis
  21. GRB 170705A: MASTER-OAFA early OT observations
  22. GRB 170629A: Swift-XRT refined Analysis
  23. GRB 170629A: Fermi GBM observation
  24. GRB 170626A: Swift-XRT refined Analysis
  25. LIGO/Virgo G288732: Fermi GBM Upper Limits for the LIGO Trigger and LAT Candidate
  26. GRB 170610A: MAXI/GSC detection
  27. LIGO/Virgo G288732 : MAXI/GSC observations
  28. GRB 170607A: Swift-XRT refined Analysis
  29. GRB 170519A: TShAO and AbAO optical observations
  30. GRB 170604A: Swift/UVOT Observations
  31. GRB 170604A: Swift-XRT refined Analysis
  32. GRB 170604A: Enhanced Swift-XRT position
  33. GRB 170604A: Swift-BAT refined analysis
  34. GRB 170604A: optical observations
  35. GRB 170604A: Swift detection of a burst
  36. GRB 170531B: Swift-BAT refined analysis
  37. GRB 170531B: Swift-XRT refined Analysis
  38. GRB 170531A: Swift-XRT refined Analysis
  39. GRB 170531B: MASTER Net optical counterpart refind position and magnitude
  40. LIGO/Virgo G268556: optical observations and classification of Pan-STARRS1 transients
  41. GRB 170526A: Swift-XRT refined Analysis
  42. Konus-Wind observation of GRB 170524B
  43. GRB 170524A: TSHAO and CrAO optical observations
  44. GRB 170524B: Swift detection of a burst
  45. Konus-Wind observation of GRB 170522B
  46. GRB 170519A: KAIT Optical Observations
  47. GRB 170519A: Swift-XRT refined Analysis
  48. GRB 170519A: iTelescope T11 optical observations
  49. LIGO/Virgo G277583: UH88/SNIFS classification of ATLAS and PS1 transients
  50. GRB 170510A: Swift-XRT afterglow detection
  51. GRB 170516A: Swift-XRT refined Analysis
  52. Swift Trigger AXP CXOU J164710.2-455216: MASTER-OAFA observations
  53. Swift XRT observations of GRB 170424A
  54. LIGO/Virgo G284239:SVOM/Mini-GWAC observations of the initial skymap
  55. LIGO/VIRGO G284239: Fermi GBM Upper Limits
  56. LIGO/Virgo G284239: MASTER automatic follow up and synchronous observations
  57. LIGO/Virgo G284239: TZAC TAROT network observations with TRE/TCA/TCH
  58. Short GRB 170428A: MASTER-OAFA final reduction of the optical observations
  59. GRB 170428A: Swift-XRT refined Analysis
  60. GRB 170424A: Fermi GBM detection
  61. GRB 170424A: Fermi-LAT detection
  62. GRB 170419A: Swift-XRT refined Analysis
  63. GRB 170419B: Fermi GBM observation
  64. GRB 170419A: Swift detection of a burst
  65. GRB 170405A: Swift-XRT refined Analysis
  66. LIGO/Virgo G275404: European VLBI Network (EVN) follow-up of the near-IR transient in the AGL J1914+1043 field
  67. IPN Triangulation of GRB 170403A (short)
  68. Fermi-LAT Gamma-ray Observations of IceCube-170321
  69. GRB 170331A: Swift-BAT refined analysis
  70. GRB 170330A: Swift-XRT refined Analysis
  71. GRB 170331A: Swift-XRT refined Analysis
  72. GRB 170331A: Prompt enhanced Swift-XRT position
  73. GRB 170331A: Swift detection of a burst
  74. LIGO/Virgo G277583: Fermi GBM Observations
  75. Konus-Wind observation of GRB 170320A
  76. GRB 170318B: Swift-XRT refined Analysis
  77. GRB 170318A: Swift-XRT refined Analysis
  78. GRB 170318A: Swift-BAT refined analysis
  79. GRB 170318A: Enhanced Swift-XRT position
  80. GRB 170318A: Prompt enhanced Swift-XRT position
  81. GRB 170318A: Swift detection of a burst
  82. IceCube-170312A: MASTER follow-up observations
  83. LIGO/Virgo G277583: Asiago spectroscopic classification of ATLAS17byo and ATLAS17cgg
  84. GRB 170317A: Swift-XRT refined Analysis
  85. LIGO/Virgo G277583: ATLAS coverage and transients over the first 2 days
  86. LIGO/Virgo G277583: ATLAS17cck is likely a minor planet
  87. LIGO/Virgo G277583: GROND follow up of ATLAS17cck
  88. LIGO/Virgo G277583: ATLAS17cck - a fast declining transient
  89. LIGO/Virgo G277583: ERRATUM LV GCN 20871: TAROT Calern (TCA) observations
  90. LIGO/Virgo G277583: TAROT Calern (TCA) observations
  91. LIGO/Virgo G277583: SVOM/Mini-GWAC observations of the initial skymap
  92. LIGO/Virgo G270580: optical observations and classification of PS and MASTER sources
  93. GRB 170311A: Swift-XRT refined Analysis
  94. Swift Trigger 741528: a possible GRB
  95. Konus-Wind observation of GRB 170306B
  96. GRB 170306A: Swift-XRT refined Analysis
  97. LIGO/Virgo G275697: Further Swift-XRT sources
  98. GRB 170306A: LCO Cerro Tololo observations
  99. GRB170305A: Fermi GBM detection
  100. LIGO/Virgo G275697: Further Swift-XRT sources

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