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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"

37622 results found.

  1. GRB 160104A: MITSuME Okayama Ks-band upper-limit
  2. GRB 160104B: MAXI/GSC detection
  3. GRB 160104A: MITSuME Akeno Optical Observation
  4. GRB 160104A: LCOGT-FTN afterglow candidate
  5. GRB 160104A: Swift detection of a burst
  6. GRB 160101A: CALET Gamma-Ray Burst Monitor detection
  7. LIGO/Virgo G211117: Fermi/LAT observations
  8. GRB 151231A: CALET Gamma-Ray Burst Monitor detection
  9. GRB 160102A: Swift-XRT observations
  10. GRB 160101A: MITSuME Akeno optical upper limits
  11. GRB 160102A: Tiled Swift observations
  12. GRB 160102A: MAXI/GSC detection
  13. GRB 160101B: Fermi-LAT detection
  14. GRB 160101B: Fermi GBM detection
  15. GRB 160101A: Swift/UVOT Detection
  16. GRB 160101A: Fermi GBM observation
  17. GRB 160101A: Swift-XRT afterglow detection
  18. GRB 160101A: Tiled Swift observations
  19. GRB 160101A: MAXI/GSC detection
  20. GRB 151227B: CALET Gamma-Ray Burst Monitor detection
  21. GRB 151231B: Fermi GBM observation
  22. GRB 151231A: Fermi GBM observation
  23. Konus-Wind observation of GRB 151227B
  24. IPN Triangulation of GRB 151227B
  25. GRB 151228A: Correction to GCN 18770
  26. GRB 151228A: Swift-XRT refined Analysis
  27. V404Cyg Swift Trigger 668097: CrAO RT-22 radio observations
  28. V404Cyg Swift Trigger 668097: AbAO optical observations
  29. GRB 151228B: Swift/UVOT Detection
  30. GRB 151229A: MITSuME Akeno optical upper limits
  31. GRB 151229A: MITSuME Okayama upper limits
  32. GRB 151229A Swift-BAT Spectral lag analysis
  33. GRB 151228B: MITSuME Akeno optical upper limits
  34. GRB 151229A: Swift-XRT refined Analysis
  35. GRB 151229A: Fermi GBM observation
  36. GRB 151228B: Fermi GBM observation
  37. GRB 151228A: Swift-BAT refined analysis
  38. GRB 151229A: Swift/UVOT observations
  39. GRB 151228B: Swift-BAT refined analysis
  40. GRB 151229A: Swift-BAT refined analysis
  41. GRB 151229A: Enhanced Swift-XRT position
  42. GRB 151228B: Swift-XRT refined Analysis
  43. GRB 151228A: MITSuME Akeno optical upper limits
  44. GRB 151228A: T60 observations
  45. GRB 151229A: Swift detection of a short burst
  46. LIGO/Virgo G211117: DESGW program observations with DECam
  47. GRB 151228B: Enhanced Swift-XRT position
  48. LIGO/Virgo G211117: Fermi GBM Observations
  49. GRB 151228B: Swift detection of a burst with an optical detection
  50. GRB 151228A: Fermi GBM observation
  51. GRB 151228A: Swift detection of a short burst
  52. GRB 151227B: Fermi GBM detection
  53. GRB 151227A: Fermi GBM detection
  54. GRB 151212A iTelescope observation
  55. GRB 151225A: CALET Gamma-Ray Burst Monitor detection of a possible short GRB
  56. Konus-Wind observation of GRB 151222A
  57. Fermi GBM trigger 472694170/151224997 is not a GRB
  58. V404Cyg Swift Trigger 668097: TSHAO optical observations
  59. IPN Triangulation of GRB 151222A (short/hard)
  60. Fermi GBM trigger 151221730 is not a GRB
  61. GRB 151222A: Fermi GBM detection
  62. Fermi GBM trigger 151221690 is not a GRB
  63. Fermi GBM trigger 472271765/151220108 is not a GRB
  64. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  65. Fermi GBM trigger 472166503/151218890 is not a GRB
  66. LIGO/Virgo G184098: Fermi-LAT search for high-energy gamma-ray counterpart
  67. GRB 151215A: TSHAO optical observations
  68. GRB 151212B: CALET Gamma-Ray Burst Monitor detection
  69. GRB 151216A: MAXI/GSC detection
  70. GRB 151210B: Fermi GBM observation
  71. GRB151215A: Early optical light curve from pt5m, La Palma
  72. GRB 151215A: MITSuME Akeno optical upper limits
  73. GRB 151210B: CALET Gamma-Ray Burst Monitor detection
  74. GRB 151215A: Swift-XRT refined Analysis
  75. GRB 151215A: Swift-BAT refined analysis
  76. GRB151215A: Swift/UVOT detection
  77. GRB 151215A: MASTER early OT detection and light curve
  78. GRB 151215A: NOT spectroscopy and redshift
  79. GRB 151215A: Enhanced Swift-XRT position
  80. GRB 151215A: GROND Detection of the Optical/NIR Afterglow
  81. GRB 151215A: Prompt enhanced Swift-XRT position
  82. GRB 151215A: Swift detection of a burst
  83. GRB151212A: Swift/UVOT observations
  84. GRB 151212A: GROND Optical Afterglow Candidate
  85. GRB 151212A: Swift-XRT afterglow detection
  86. GRB 151212A: Tiled Swift observations
  87. GRB 151212A: MAXI/GSC detection
  88. GRB 151210A: Swift/UVOT Upper Limits
  89. GRB 151210A: Swift-BAT refined analysis
  90. GRB 151210A: Swift-XRT refined Analysis
  91. GRB 151210A: Enhanced Swift-XRT position
  92. GRB 151210A: GROND Afterglow Confirmation
  93. GRB 151210A: Optical afterglow candidate from LCOGT-Cerro Tololo
  94. GRB 151210A: Swift detection of a burst
  95. GRB 151205C: Optical follow-up observations at Kiso
  96. GRB 151205A: Khureltogot upper limit
  97. GRB 151205B: Deep GROND Upper limits
  98. GRB 130831A: MASTER early OT detection and LC
  99. GRB 151205B: further Swift-XRT observations
  100. GRB 151205C: Swift-XRT observations

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