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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"

28245 results found.

  1. GRB 151228A: Swift-BAT refined analysis
  2. GRB 151229A: Swift/UVOT observations
  3. GRB 151228B: Swift-BAT refined analysis
  4. GRB 151229A: Swift-BAT refined analysis
  5. GRB 151229A: Enhanced Swift-XRT position
  6. GRB 151228B: Swift-XRT refined Analysis
  7. LIGO/Virgo G211117: Further Swift-XRT sources
  8. GRB 151228A: T60 observations
  9. GRB 151229A: Swift detection of a short burst
  10. LIGO/Virgo G211117: DESGW program observations with DECam
  11. GRB 151228B: Enhanced Swift-XRT position
  12. LIGO/Virgo G211117: Optical NIR observation with Kanata telescope
  13. GRB 151228B: Swift detection of a burst with an optical detection
  14. LIGO/Virgo G211117: MASTER Observations and Inspection + OT
  15. LIGO/Virgo G211117: INTEGRAL was inactive at the time of the event
  16. LIGO/Virgo G211117: INAF VST-ESO PARANAL observations
  17. LIGO/Virgo G211117: Further Swift-XRT sources
  18. LIGO/Virgo G211117: Swift-XRT sources
  19. LIGO/Virgo G211117: Identification of a GW CBC Candidate
  20. GRB 151227B: Fermi GBM detection
  21. GRB 151227A: Fermi GBM detection
  22. GRB 151212A iTelescope observation
  23. Konus-Wind observation of GRB 151222A
  24. V404Cyg Swift Trigger 668097: TSHAO optical observations
  25. GRB 151222A: Fermi GBM detection
  26. LIGO/Virgo G184098: Fermi-LAT search for high-energy gamma-ray counterpart
  27. GRB 151215A: TSHAO optical observations
  28. GRB151215A: Continued P60 Observations
  29. GRB 151212B: CALET Gamma-Ray Burst Monitor detection
  30. GRB 151216A: MAXI/GSC detection
  31. GRB 151210B: Fermi GBM observation
  32. GRB151215A: Early optical light curve from pt5m, La Palma
  33. GRB 151215A: Swift-XRT refined Analysis
  34. GRB 151215A: Swift-BAT refined analysis
  35. GRB151215A: Swift/UVOT detection
  36. GRB 151215A: Enhanced Swift-XRT position
  37. GRB 151215A: GROND Detection of the Optical/NIR Afterglow
  38. GRB 151215A: Swift detection of a burst
  39. LIGO/Virgo G184098: LOFAR follow-up
  40. GRB151212A: Swift/UVOT observations
  41. GRB 151212A: GROND Optical Afterglow Candidate
  42. GRB 151212A: MAXI/GSC detection
  43. GRB 151210A: Swift/UVOT Upper Limits
  44. GRB 151210A: Swift-BAT refined analysis
  45. GRB 151210A: Swift-XRT refined Analysis
  46. GRB 151210A: Enhanced Swift-XRT position
  47. GRB 151210A: GROND Afterglow Confirmation
  48. GRB 151210A: Optical afterglow candidate from LCOGT-Cerro Tololo
  49. GRB 151210A: Swift detection of a burst
  50. GRB 151205C: Optical follow-up observations at Kiso
  51. GRB 151205A: Khureltogot upper limit
  52. GRB 151205B: Deep GROND Upper limits
  53. GRB 130831A: MASTER early OT detection and LC
  54. GRB 151205B: further Swift-XRT observations
  55. GRB 151205C: Swift-XRT observations
  56. GRB 151205B, Swift-BAT refined analysis
  57. GRB 151205A: Swift-XRT refined Analysis
  58. GRB 151205A, Swift-BAT refined analysis
  59. GRB 151205C: MAXI/GSC detection
  60. GRB 151205B: MASTER-NET early optical observations
  61. GRB 151205A: Fermi GBM detection
  62. GRB 151205A: Garching Telescope Upper Limit
  63. GRB 151205B: Swift-XRT observations
  64. GRB 151205A: Swift/UVOT Upper Limits
  65. GRB 151205A: Enhanced Swift-XRT position
  66. GRB 151205A: Swift detection of a burst
  67. GRB 151127A iTelescope observation
  68. LIGO/Virgo G184098: Results of of 2nd epoch of ASKAP follow-up
  69. GRB 151122A: Further Swift-XRT observations, no afterglow detected.
  70. GRB 151127A: Swift/UVOT Upper Limits
  71. GRB 151127A: Swift-XRT refined Analysis
  72. GRB 151127A: Swift-BAT refined analysis
  73. GRB 151127A: Enhanced Swift-XRT position
  74. GRB 151127A: GROND K-band upper limit
  75. GRB 151127A: LCOGT-SSO optical upper limits
  76. GRB 151127A: Swift detection of a short burst
  77. GRB 151118A iTelescope observation
  78. GRB 151122A: Swift/UVOT Observations
  79. GRB 151122A: Swift-XRT observations
  80. GRB 151122A: Fermi GBM detection
  81. GRB 151122A: Swift detection of a burst
  82. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  83. Swift Trigger 664610 is not astrophysical
  84. Swift Trigger 664610: is unlikely a GRB
  85. GRB 151120A: Swift-XRT afterglow detection
  86. GRB 151118A: AAO optical upper limit
  87. LIGO/Virgo G194575: Updated significance from offline GW analysis
  88. GRB 151120A: GROND optical/NIR afterglow
  89. GRB 151118A, Swift-BAT refined analysis
  90. GRB 151118A: Early optical limit from pt5m, La Palma
  91. GRB 151118A: ISON-NM early optical limit
  92. GRB 151118A: Swift-XRT refined Analysis
  93. GRB 151027A: SAO RAS and Mt. Terskol observations
  94. GRB 151118A: Swift/UVOT Upper Limits
  95. GRB 151118A: Enhanced Swift-XRT position
  96. GRB GRB 151118A: MASTER-NET optical observations
  97. GRB 151118A: Optical observations from OSN
  98. GRB 151118A: Swift detection of a burst
  99. GRB151027A; Optical observations
  100. GRB 151114A: GROND Detection of the Optical/NIR Afterglow Candidate

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