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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"

41749 results found.

  1. GRB 151228A: Swift-XRT refined Analysis
  2. V404Cyg Swift Trigger 668097: CrAO RT-22 radio observations
  3. LIGO/Virgo G211117: MASTER Observations of the 3 iPTF candidates
  4. V404Cyg Swift Trigger 668097: AbAO optical observations
  5. GRB 151228B: Swift/UVOT Detection
  6. GRB 151229A: MITSuME Akeno optical upper limits
  7. LIGO/Virgo G211117: Optical Observations with Kiso Schmidt telescope and KWFC
  8. LIGO/Virgo G211117: List of near-term future observation regions by Project Mini-GWAC of SVOM
  9. LIGO/Virgo G211117: iPTF Optical Transient Candidates
  10. GRB 151229A: MITSuME Okayama upper limits
  11. GRB 151229A Swift-BAT Spectral lag analysis
  12. LIGO/Virgo G211117: La Silla - QUEST observations 2015 Dec 28, 29
  13. GRB 151228B: MITSuME Akeno optical upper limits
  14. GRB 151229A: Swift-XRT refined Analysis
  15. GRB 151229A: Fermi GBM observation
  16. GRB 151228B: Fermi GBM observation
  17. GRB 151228A: Swift-BAT refined analysis
  18. GRB 151229A: Swift/UVOT observations
  19. GRB 151228B: Swift-BAT refined analysis
  20. GRB 151229A: Swift-BAT refined analysis
  21. GRB 151228B: Swift-XRT refined Analysis
  22. LIGO/Virgo G211117: Further Swift-XRT sources
  23. GRB 151228A: MITSuME Akeno optical upper limits
  24. GRB 151228A: T60 observations
  25. GRB 151229A: Swift detection of a short burst
  26. LIGO/Virgo G211117: DESGW program observations with DECam
  27. LIGO/Virgo G211117: Optical NIR observation with Kanata telescope
  28. LIGO/Virgo G211117: Fermi GBM Observations
  29. LIGO/Virgo G211117: Optical follow-up with Kanata telescope
  30. GRB 151228B: Swift detection of a burst with an optical detection
  31. LIGO/Virgo G211117: MASTER Observations and Inspection + OT
  32. GRB 151228A: Fermi GBM observation
  33. LIGO/Virgo G211117: Pan-STARRS1 observations 2015-12-28
  34. LIGO/Virgo G211117: INAF VST-ESO PARANAL observations
  35. LIGO/Virgo G211117: Further Swift-XRT sources
  36. LIGO/Virgo G211117: Swift-XRT sources
  37. GRB 151228A: Swift detection of a short burst
  38. LIGO/Virgo G211117: SWASP optical observations
  39. LIGO/Virgo G211117: MASTER possible OT detection at the begining of inspection
  40. LIGO/Virgo G211117: Identification of a GW CBC Candidate
  41. GRB 151227B: Fermi GBM detection
  42. GRB 151227A: Fermi GBM detection
  43. GRB 151212A iTelescope observation
  44. Konus-Wind observation of GRB 151222A
  45. Fermi GBM trigger 472694170/151224997 is not a GRB
  46. V404Cyg Swift Trigger 668097: TSHAO optical observations
  47. IPN Triangulation of GRB 151222A (short/hard)
  48. Fermi GBM trigger 151221730 is not a GRB
  49. V404Cyg Swift Trigger 668097: MASTER-Tunka optical wake up detection
  50. V404Cyg Swift Trigger 668097:
  51. GRB 151222A: Fermi GBM detection
  52. Fermi GBM trigger 151221690 is not a GRB
  53. Fermi GBM trigger 472271765/151220108 is not a GRB
  54. IBAS Alert 7313 is SGR J1935+2154
  55. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  56. Fermi GBM trigger 472166503/151218890 is not a GRB
  57. LIGO/Virgo G184098: Fermi-LAT search for high-energy gamma-ray counterpart
  58. GRB 151215A: TSHAO optical observations
  59. GRB151215A: Continued P60 Observations
  60. GRB 151212B: CALET Gamma-Ray Burst Monitor detection
  61. GRB 151216A: MAXI/GSC detection
  62. GRB 151210B: Fermi GBM observation
  63. GRB151215A: Early optical light curve from pt5m, La Palma
  64. GRB 151215A: MITSuME Akeno optical upper limits
  65. GRB 151210B: CALET Gamma-Ray Burst Monitor detection
  66. GRB 151215A: Swift-XRT refined Analysis
  67. GRB 151215A: Swift-BAT refined analysis
  68. GRB151215A: Swift/UVOT detection
  69. GRB 151215A: MASTER early OT detection and light curve
  70. GRB 151215A: NOT spectroscopy and redshift
  71. GRB 151215A: GROND Detection of the Optical/NIR Afterglow
  72. GRB151215A: P60 Optical Afterglow Candidate
  73. GRB 151215A: Swift detection of a burst
  74. LIGO/Virgo G184098: LOFAR follow-up
  75. GRB151212A: Swift/UVOT observations
  76. GRB 151212A: GROND Optical Afterglow Candidate
  77. GRB 151212A: Swift-XRT afterglow detection
  78. GRB 151212A: Tiled Swift observations
  79. GRB 151212A: MAXI/GSC detection
  80. GRB 151210A: Swift/UVOT Upper Limits
  81. GRB 151210A: Swift-BAT refined analysis
  82. GRB 151210A: Swift-XRT refined Analysis
  83. GRB 151210A: GROND Afterglow Confirmation
  84. GRB 151210A: Optical afterglow candidate from LCOGT-Cerro Tololo
  85. GRB 151210A: Swift detection of a burst
  86. GRB 151205C: Optical follow-up observations at Kiso
  87. GRB 151205A: Khureltogot upper limit
  88. Swift detection of 4U 1850-03
  89. GRB 151205B: Deep GROND Upper limits
  90. GRB 130831A: MASTER early OT detection and LC
  91. GRB 151205B: further Swift-XRT observations
  92. GRB 151205C: Swift-XRT observations
  93. GRB 151205B, Swift-BAT refined analysis
  94. GRB 151205A: Swift-XRT refined Analysis
  95. GRB 151205A, Swift-BAT refined analysis
  96. GRB 151205C: Tiled Swift observations
  97. GRB 151205C: MAXI/GSC detection
  98. GRB 151205B: MASTER-NET early optical observations
  99. GRB 151205A: Fermi GBM detection
  100. GRB 151205A: Garching Telescope Upper Limit

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