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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"

27471 results found.

  1. GRB 150527A: Swift-XRT refined Analysis
  2. GRB 150527A: Swift/UVOT Upper Limits
  3. GRB150527A: REM - NIR afterglow
  4. GRB 150527A: Swift-BAT refined analysis
  5. GRB 150527A: Fermi GBM observation
  6. GRB 150527A: LCOGT McDonald observations
  7. GRB 150527A: RATIR Afterglow Detection
  8. GRB 150523A: Suzaku WAM observation of the prompt emission
  9. GRB 150527A: Swift detection of a burst
  10. GRB 150523A: Swift/UVOT Detection
  11. GRB 150523A: LCOGT Cerro-Tololo optical afterglow candidate
  12. Confirmation that Swift Trigger 641332 is not astrophysical
  13. GRB 150523A: Fermi-LAT detection
  14. GRB 150523A: Fermi GBM detection
  15. Swift trigger 641332 is probably not an astrophysical source
  16. GRB 150518A: Continued RATIR optical observations
  17. GRB 150518A: MASTER-net before, early and after optical stereoscopic observations with possible MP discovery inside MAXI error box
  18. Konus-Wind observation of GRB 150518A
  19. GRB 150518A : Xinglong TNT upper limit
  20. GRB 150518A: RATIR optical observations
  21. GRB 150518A: GMG observation
  22. Swift/UVOT observations of GRB150518A
  23. GRB 150514A: GROND Bright Afterglow Confirmation
  24. GRB 150514A: Swift/UVOT Detection
  25. GRB 150514A: Fermi GBM Detection
  26. GRB 150514A: Fermi-LAT detection
  27. GRB 150513A: Swift-BAT refined analysis
  28. GRB 150513A: Fermi GBM detection
  29. GRB 150513A: Fermi-LAT detection
  30. GRB 150512A: Fermi GBM detection
  31. GRB 150513A: Swift detection of a burst
  32. GRB 150512A: iPTF Optical Observations
  33. GRB 150510A: Fermi GBM detection
  34. GRB 150510A: Fermi-LAT Refined Analysis
  35. GRB 150510A: Fermi-LAT detection
  36. GRB 150423A: GMG observation limit
  37. Konus-Wind observation of GRB 150428A
  38. Confirmation that Swift Trigger 639636 is not astrophysical
  39. Swift Trigger 639636: a possible GRB
  40. GRB 150423A: JCMT SCUBA-2 sub-mm observation
  41. GRB 150430A: GROND Upper Limits
  42. GRB 150430A: Swift-BAT refined analysis
  43. Konus-Wind observation of GRB 150430A
  44. GRB 150430A: Fermi GBM Detection
  45. GRB 150430A: Swift-XRT refined Analysis
  46. GRB 150430A: MAXI/GSC detection
  47. GRB 150430A: Swift/UVOT Upper Limits
  48. GRB 150430A: Swift detection of a burst
  49. GRB 150428B: Swift/UVOT Upper Limits
  50. GRB 150428A: Swift/UVOT Upper Limits
  51. GRB 150426A: Fermi GBM detection
  52. GRB 150428C: MASTER-net automatic optical inspection
  53. GRB 150428B: Swift-XRT refined Analysis
  54. GRB 150428B: MASTER-net prompt optical observation
  55. Fermi GBM trigger 150424722 is not a GRB
  56. GRB 150428A: MASTER-net early optical observation
  57. GRB 150428A: Swift-XRT refined Analysis
  58. GRB 150428B: Swift-BAT refined analysis
  59. GRB 150428A: Swift-BAT refined analysis
  60. GRB 150428A: RATIR optical observations
  61. GRB 150428A: P60 observations
  62. GRB 150428A: GROND Dark Burst Host Candidate
  63. GRB 150428B: Swift detection of a burst
  64. GRB 150428A: Swift detection of a burst
  65. Trigger 639199: Swift detection of IGRJ16418-4532
  66. GRB 150424A: RATIR Observations
  67. GRB 150424A: Swift-BAT refined analysis
  68. GRB 150424A: Swift-XRT refined Analysis
  69. GRB 150424A: spectral lag, extended-time emission
  70. GRB 150424A: 10.4m GTC spectroscopy
  71. GRB 150424A: GROND detects strong fading
  72. GRB 150424A: NOT optical observations
  73. GRB 150423A: VLT/X-shooter spectroscopy and tentative redshift
  74. GRB 150423A: Continued RATIR optical afterglow monitoring
  75. GRB 150424B: Fermi GBM detection
  76. Konus-Wind observation of GRB 150424A
  77. GRB 150424A: Swift/UVOT Observations
  78. GRB 150424A: Keck detection of optical afterglow
  79. GRB 150424A: Swift detection of a short burst
  80. GRB 150423A: Swift-BAT refined analysis
  81. GRB 150423A: Swift/UVOT Upper Limits
  82. GRB 150423A: Swift-XRT refined Analysis
  83. GRB 150423A: RATIR optical afterglow monitoring
  84. GRB 150422A: Fermi GBM detection
  85. GRB 150423A: Keck optical afterglow confirmation
  86. GRB 150423A: GROND afterglow candidate
  87. GRB 150413A: Konus-Wind and Swift/BAT joint spectral analysis
  88. GRB 150423A: GROND observation
  89. GRB 150423A: Swift detection of a short burst
  90. GRB150418A: Swift/UVOT did not detect a new source
  91. Swift trigger 638589 is probably not an astrophysical source
  92. GRB 150413A: Swift-XRT observations
  93. GRB 150416A: Fermi GBM detection
  94. Confirmation that Swift trigger 638217 is not an astrophysical source
  95. LOAO B, R Observations of GRB150413A
  96. Swift Trigger 638217 is probably not an astrophysical source
  97. GRB 150416A: Fermi-LAT detection
  98. GRB 150413A: GMG observation
  99. GRB 150413A: Bassano Bresciano Observatory optical observations
  100. Konus-Wind observation of a bright burst from SGR 1935+2154

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