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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"

27220 results found.

  1. Trigger 668879: Swift detection of V 404 Cyg again
  2. Trigger 668877: Swift detection of V 404 Cyg
  3. LIGO/Virgo G211117: MAGIC very-high energy gamma-ray observations
  4. GRB 151228A: Correction to GCN 18770
  5. LIGO/Virgo G211117: SkyMapper observations and transient candidate
  6. GRB 151228A: Swift-XRT refined Analysis
  7. V404Cyg Swift Trigger 668097: CrAO RT-22 radio observations
  8. LIGO/Virgo G211117: MASTER Observations of the 3 iPTF candidates
  9. V404Cyg Swift Trigger 668097: AbAO optical observations
  10. GRB 151228B: Swift/UVOT Detection
  11. LIGO/Virgo G211117: List of near-term future observation regions by Project Mini-GWAC of SVOM
  12. LIGO/Virgo G211117: iPTF Optical Transient Candidates
  13. GRB 151229A: Swift-XRT refined Analysis
  14. GRB 151229A: Fermi GBM observation
  15. GRB 151228B: Fermi GBM observation
  16. GRB 151228A: Swift-BAT refined analysis
  17. GRB 151229A: Swift/UVOT observations
  18. GRB 151228B: Swift-BAT refined analysis
  19. GRB 151229A: Swift-BAT refined analysis
  20. GRB 151228B: Swift-XRT refined Analysis
  21. LIGO/Virgo G211117: Further Swift-XRT sources
  22. GRB 151228A: T60 observations
  23. GRB 151229A: Swift detection of a short burst
  24. LIGO/Virgo G211117: DESGW program observations with DECam
  25. GRB 151228B: Swift detection of a burst with an optical detection
  26. LIGO/Virgo G211117: MASTER Observations and Inspection + OT
  27. LIGO/Virgo G211117: INTEGRAL was inactive at the time of the event
  28. GRB 151228A: Fermi GBM observation
  29. LIGO/Virgo G211117: INAF VST-ESO PARANAL observations
  30. LIGO/Virgo G211117: Further Swift-XRT sources
  31. LIGO/Virgo G211117: Swift-XRT sources
  32. GRB 151228A: Swift detection of a short burst
  33. GRB 151227B: Fermi GBM detection
  34. GRB 151227A: Fermi GBM detection
  35. GRB 151212A iTelescope observation
  36. GRB 151225A: CALET Gamma-Ray Burst Monitor detection of a possible short GRB
  37. Konus-Wind observation of GRB 151222A
  38. Fermi GBM trigger 472694170/151224997 is not a GRB
  39. V404Cyg Swift Trigger 668097: TSHAO optical observations
  40. Fermi GBM trigger 151221730 is not a GRB
  41. V404Cyg Swift Trigger 668097: MASTER-Tunka optical wake up detection
  42. V404Cyg Swift Trigger 668097:
  43. Trigger 668097: Swift detection of V 404 Cyg
  44. GRB 151222A: Fermi GBM detection
  45. Fermi GBM trigger 151221690 is not a GRB
  46. Fermi GBM trigger 472271765/151220108 is not a GRB
  47. Fermi GBM trigger 472166503/151218890 is not a GRB
  48. LIGO/Virgo G184098: Fermi-LAT search for high-energy gamma-ray counterpart
  49. GRB151215A: Continued P60 Observations
  50. GRB 151212B: CALET Gamma-Ray Burst Monitor detection
  51. GRB 151210B: Fermi GBM observation
  52. GRB 151210B: CALET Gamma-Ray Burst Monitor detection
  53. GRB 151215A: Swift-XRT refined Analysis
  54. GRB 151215A: Swift-BAT refined analysis
  55. GRB151215A: Swift/UVOT detection
  56. GRB 151215A: MASTER early OT detection and light curve
  57. GRB 151215A: NOT spectroscopy and redshift
  58. GRB 151215A: GROND Detection of the Optical/NIR Afterglow
  59. GRB151215A: P60 Optical Afterglow Candidate
  60. GRB 151215A: Swift detection of a burst
  61. LIGO/Virgo G184098: LOFAR follow-up
  62. GRB151212A: Swift/UVOT observations
  63. GRB 151212A: GROND Optical Afterglow Candidate
  64. GRB 151210A: Swift/UVOT Upper Limits
  65. GRB 151210A: Swift-BAT refined analysis
  66. GRB 151210A: Swift-XRT refined Analysis
  67. GRB 151210A: GROND Afterglow Confirmation
  68. GRB 151210A: Swift detection of a burst
  69. GRB 151205A: Khureltogot upper limit
  70. Swift detection of 4U 1850-03
  71. GRB 151205B: Deep GROND Upper limits
  72. GRB 130831A: MASTER early OT detection and LC
  73. GRB 151205B, Swift-BAT refined analysis
  74. GRB 151205A: Swift-XRT refined Analysis
  75. GRB 151205A, Swift-BAT refined analysis
  76. GRB 151205B: MASTER-NET early optical observations
  77. GRB 151205A: Fermi GBM detection
  78. GRB 151205A: Garching Telescope Upper Limit
  79. GRB151205B: Initial UVOT observations
  80. GRB 151205B: Swift-XRT observations
  81. GRB 151205A: Swift/UVOT Upper Limits
  82. GRB 151205B: Swift detection of a burst
  83. GRB 151205A: Swift detection of a burst
  84. GRB 151127A iTelescope observation
  85. Fermi GBM trigger 470712580/151202062 is not a GRB
  86. Fermi GBM trigger 470290196/151127174 is not a GRB
  87. Fermi GBM trigger 470375959/151128166 is not a GRB
  88. GRB 151127A: Swift/UVOT Upper Limits
  89. GRB 151127A: Swift-XRT refined Analysis
  90. GRB 151127A: Swift-BAT refined analysis
  91. GRB 151127A: GROND K-band upper limit
  92. GRB 151127A: Swift detection of a short burst
  93. GRB 151118A iTelescope observation
  94. GRB 151122A: Swift/UVOT Observations
  95. GRB 151122A: Fermi GBM detection
  96. GRB 151122A: Swift detection of a burst
  97. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  98. Swift Trigger 664610 is not astrophysical
  99. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  100. Swift Trigger 664610: is unlikely a GRB

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