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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"

6828 results found.

  1. LIGO/Virgo G211117: Swift-XRT sources
  2. GRB 151227B: Fermi GBM detection
  3. GRB 151227A: Fermi GBM detection
  4. GRB 151222A: Fermi GBM detection
  5. LIGO/Virgo G184098: Fermi-LAT search for high-energy gamma-ray counterpart
  6. GRB 151215A: TSHAO optical observations
  7. GRB 151210B: Fermi GBM observation
  8. GRB 151215A: Swift-XRT refined Analysis
  9. GRB 151212A: Swift-XRT afterglow detection
  10. GRB 151210A: Swift-XRT refined Analysis
  11. GRB 151205B: further Swift-XRT observations
  12. GRB 151205C: Swift-XRT observations
  13. GRB 151205A: Swift-XRT refined Analysis
  14. GRB 151205A: Fermi GBM detection
  15. LIGO/Virgo G184098: Results of of 2nd epoch of ASKAP follow-up
  16. GRB 151122A: Further Swift-XRT observations, no afterglow detected.
  17. GRB 151127A: Swift-XRT refined Analysis
  18. GRB 151122A: Swift-XRT observations
  19. GRB 151122A: Fermi GBM detection
  20. GRB 151027A: Maidanak optical observations
  21. Swift Trigger 664610 is not astrophysical
  22. GRB 151120A: Swift-XRT afterglow detection
  23. GRB 151120A: Fermi GBM observation
  24. GRB 151118A: Swift-XRT refined Analysis
  25. GRB 151114A: Swift-XRT refined Analysis
  26. GRB 151112A: Swift-XRT refined Analysis
  27. GRB 151111A: Swift-XRT refined Analysis
  28. GRB 151111A: Fermi GBM observation
  29. GRB 151107B
  30. LIGO/Virgo G194575: Swift observations if iPTF15dld
  31. GRB 151030A: Fermi GBM observation
  32. GRB 151031A: Swift-XRT refined Analysis
  33. GRB 151029A: Swift-XRT refined Analysis
  34. GRB 151027A: SAO RAS optical observations
  35. GRB 151027B: Swift-XRT refined Analysis
  36. GRB 151027A: THO optical observations
  37. GRB 151027A: Fermi GBM observation
  38. GRB 151027A: Swift-XRT refined Analysis
  39. LIGO/Virgo G194575: ASKAP followup
  40. GRB 151023A: Swift-XRT refined Analysis
  41. Possible Fermi-LAT Gamma-ray counterpart for LIGO/Virgo G194575
  42. GRB 151022A: Swift-XRT refined Analysis
  43. LIGO/Virgo G194575: Identification of a GW CBC Candidate
  44. GRB 151022A: MITSuME Okayama Ks-band upper-limit
  45. GRB 151022A: Swift detection of a burst
  46. GRB 151021A: MITSuME Okayama Ks-band upper-limit
  47. GRB 151021B: Fermi GBM detection
  48. GRB 151021A: Swift-XRT refined Analysis
  49. GRB 151004A: Swift-XRT follow-up observations
  50. GRB 151006A: MITSuME Okayama Ks-band upper-limit
  51. GRB 151006A: Swift-XRT refined Analysis
  52. GRB 151006A: Fermi-LAT detection
  53. GRB 151006A: Fermi GBM detection
  54. Trigger 657564 / GRB 151004A: Swift BAT and XRT refined analysis
  55. Swift Trigger 657564: XRT prompt analysis
  56. GRB 151001B: Swift-XRT refined Analysis
  57. GRB 151001A: Swift-XRT refined Analysis
  58. GRB 151001A: Fermi GBM detection
  59. GRB 150925A: Swift-XRT refined Analysis
  60. LIGO/Virgo G184098: ASKAP followup
  61. GRB 150922A: Fermi GBM observation
  62. LIGO/Virgo G184098: INTEGRAL search of temporally coincident prompt hard X-ray emission
  63. ANTARES neutrino detection: Fermi GBM Observations
  64. LIGO/Virgo G184098: SkyMapper observations
  65. LIGO/Virgo G184098: Swift follow-up observations
  66. GRB 150915A: Swift-XRT refined Analysis
  67. GRB150915A : IRSF NIR upper limits
  68. GRB 150906B: Further analysis of the Konus-Wind data
  69. GRB 150910A: TSHAO optical observations
  70. GRB 150910A: T100 observations
  71. GRB 150907A: Swift-XRT afterglow detection
  72. GRB 150912A: Swift-XRT and UVOT observations
  73. GRB 150912A: Fermi GBM observation
  74. GRB 150911A: Swift-XRT refined Analysis
  75. GRB 150910A: continued SAO RAS optical observations
  76. GRB150911A MITSuME Okayama Ks-band upper-limit
  77. GRB 150910A: TSHAO optical observations
  78. GRB 150910A: MITSuME Okayama Ks-band Observation
  79. GRB 150910A: SAO RAS optical photometry
  80. GRB 150910A: Swift-XRT refined Analysis
  81. GRB 150910A: Swift/UVOT Detection of a Brightening Afterglow
  82. GRB 150907B: Swift-XRT refined Analysis
  83. GRB 150907A: Swift-XRT observations
  84. GRB 150906A: Fermi GBM detection
  85. GRB 150902A: Swift-XRT afterglow detection
  86. GRB 150902A: Swift-XRT observations
  87. GRB 150902A: Fermi GBM detection
  88. GRB 150902A: Fermi-LAT detection
  89. GRB 150821A: Flattening in the UVOT light curve
  90. GRB 150831B: Swift-XRT refined Analysis
  91. GRB 150831B: Fermi GBM detection
  92. GRB 150831A: Swift/UVOT Upper Limits
  93. GRB 150831A: Swift-XRT refined Analysis
  94. GRB 150824A: Fermi GBM detection
  95. GRB 150821A: Swift-XRT refined Analysis
  96. GRB 150819A: Mondy and TSHAO optical upper limits
  97. GRB 150821A: Fermi GBM detection
  98. GRB150819A: NOT imaging
  99. GRB 150818A: Continued NOT monitoring - afterglow confirmation
  100. GRB 150819B: Fermi GBM detection

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