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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"

42008 results found.

  1. GRB 161214B: MASTER-Kislovodsk early optical observations
  2. GMRT radio detection of GRB 161219B
  3. GRB 161214A: MASTER-IAC early optical observations
  4. GRB 161219B: Spectroscopic detection of the associated SN with OSIRIS/GTC
  5. Fermi GBM trigger 504490076/161227005 is not a GRB
  6. GRB 161224A: TSHAO optical observations
  7. GRB 161224A: Swift/UVOT Upper limits
  8. GRB 161224A: Swift-XRT refined Analysis
  9. GRB 161224A: Swift-BAT refined analysis
  10. Trigger 728094, Swift-BAT refined analysis
  11. Swift Trigger 728268: a possible GRB
  12. Fermi GBM trigger 504233075/161224301 is not a GRB
  13. Swift Trigger 728094: a possible GRB
  14. GRB 161219B: UKIRT near-IR afterglow detection
  15. GRB 161219B: POLAR Observation
  16. GRB161219.78 MASTER-Net OT detection
  17. Fermi GBM trigger 504061556/161222046 is not a GRB
  18. GRB 161219B: Rapid ALMA Observations & Detection
  19. Correction to GCN 20323 "Konus-Wind observation of GRB 161219B"
  20. Fermi GBM trigger 504043585/161221838 is not a GRB
  21. GRB 161220A: Swift-BAT refined analysis
  22. GRB 161218B: Astrosat CZTI detection
  23. Konus-Wind observation of GRB 161219B
  24. GRB 161219B: SALT observations
  25. GRB 161219B: VLT/X-shooter redshift
  26. Fermi GBM trigger 503982114/161221126 is not a GRB
  27. GRB 161214B: optical spectroscopy of the foreground SDSS object
  28. GRB 161202A: 15 GHz upper limits from AMI
  29. GRB 161129A: 15 GHz upper limits from AMI
  30. GRB 161220A: Swift-XRT refined Analysis
  31. GRB 161220A: LCO-FTS observations
  32. GRB 161219B: MITSuME Akeno Optical Observation
  33. GRB 161219B: VLA Detection
  34. GRB 161220A: GROND Upper Limits
  35. GRB 161217C: POLAR observation
  36. GRB 161217B: POLAR Observation
  37. GRB 161219B: ISON/Terskol optical observations
  38. GRB 161219B: Swift-BAT refined analysis
  39. GRB 161220A: Swift/UVOT Upper Limits
  40. GRB 161219B: Swift/UVOT Detection
  41. GRB 161219B: Watcher optical observations
  42. Konus-Wind observation of GRB 161218B
  43. IPN Triangulation of GRB 161218B (long/very bright)
  44. GRB 161220A: Swift detection of a burst
  45. GRB 161212A: POLAR Detection
  46. GRB 161219B: LCO Sutherland observations
  47. GRB 161219B: GROND afterglow observations
  48. GRB 161219B: Swift-XRT refined Analysis
  49. GRB 161219B: Swift detection of a burst with an optical afterglow
  50. GRB 161219A: a long GRB detected by INTEGRAL
  51. GRB 161218A: CALET Gamma-Ray Burst Monitor detection
  52. GRB 161218A: Swift-BAT refined analysis
  53. Konus-Wind observation of GRB 161218A
  54. Swift Trigger 727422 is not an astrophysical event.
  55. GRB 161217A: TAROT Calern observatory optical observations
  56. GRB 161218B: POLAR observation
  57. GRB 161218A: POLAR observation
  58. GRB 161218B: Fermi GBM detection
  59. GRB 161217A: MITSuME Okayama upper limits
  60. GRB 161217A: Swift-BAT refined analysis
  61. GRB 161218A: Swift detection of a burst
  62. GRB 161217A: Swift/UVOT Upper Limits
  63. GRB 161217A: Swift-XRT refined Analysis
  64. GRB 161214B: AbAO and ISON/Terskol optical observations
  65. GRB 161207A: POLAR observation
  66. GRB 161217A: Swift detection of a burst
  67. GRB 161214B: Mondy optical observations
  68. GRB 161213A: POLAR Observation
  69. GRB 161207B: POLAR observation
  70. GRB 161205A: POLAR observation
  71. GRB 161210A: POLAR observation
  72. GRB 161214B: Swift-BAT refined analysis
  73. Fermi-LAT Gamma-ray Observations of IceCube-161210
  74. GRB 161214B: Swift/UVOT Afterglow Confirmation
  75. IceCube-161210: Kanata/HONIR near-infrared follow-up observation
  76. GRB 161214B: RATIR Optical and Near-Infrared Observations
  77. GRB 161214B: Swift-XRT refined Analysis
  78. GRB 161214B: TAROT Calern observatory optical observations
  79. GRB 161214B: Chante-perdrix observatory optical observations
  80. GRB 161214B: Swift/UVOT Observations
  81. GRB 161214B: NOT optical observations, possible counterpart
  82. GRB 161214A: NOT observations of the afterglow
  83. GRB 161214B: Swift detection of a burst
  84. IceCube-161210: Konus-Wind upper limits
  85. GRB 161214A: GROND afterglow observations
  86. GRB 161214A: TAROT Calern observatory optical observations
  87. IceCube-161210: CALET Gamma-Ray Burst Monitor upper limits
  88. GRB 161214A: fading optical afterglow candidate with the LT
  89. GRB 161214A: A long GRB detected by INTEGRAL
  90. HAWC follow-up on IceCube-161210
  91. INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161210
  92. IceCube-161210: MAXI/GSC non-detection
  93. IceCube-161210: IceCube observation of a high-energy neutrino candidate event
  94. GRB 161207A: CALET Gamma-Ray Burst Monitor detection
  95. GRB 161129A: GTC redshift of the likely host galaxy
  96. GRB 161129A: NOT optical observations and candidate host galaxy
  97. GRB 161203A: POLAR Detection
  98. GRB 161129A: KWFC z-band photometry
  99. GRB 161203A: Astrosat CZTI (Veto) detection
  100. GRB 161203A: CALET Gamma-Ray Burst Monitor detection

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