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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"

19610 results found.

  1. GRB 150907B: Swift-BAT refined analysis
  2. GRB150907A: Swift/UVOT observations
  3. GRB 150907B: MASTER-SAAO early optical observations
  4. GRB 150907B: Enhanced Swift-XRT position
  5. GRB 150907B: GROND Upper Limits
  6. GRB 150907B: Swift-XRT observations
  7. GRB 150907A: Swift-XRT observations
  8. GRB 150907B: Swift detection of a burst
  9. GRB 150907A: Tiled Swift observations
  10. GRB 150818A: TSHAO and SAO RAS optical observations
  11. GRB 150902A: Swift-XRT afterglow detection
  12. ANTARES neutrino detection: ANU 2.3m and Kepler K2 Observations of the Swift x-ray source
  13. ANTARES neutrino detection: CAHA photometry & spectroscopy of the Swift source
  14. ANTARES neutrino Alert150901.32 alert and Swift XRT counterpart: MASTER optical observations and new possible candidate
  15. ANTARES neutrino detection and Swift/XRT counterpart: GMG observation
  16. GRB 150902A: Swift/UVOT Upper Limits
  17. GRB 150902A: Swift-XRT observations
  18. ANTARES neutrino detection: Optical/NIR spectroscopy of the Swift/XRT counterpart candidate from NOT
  19. GRB 150901A, Swift-BAT refined analysis
  20. ANTARES neutrino detection and possible Swift X-ray counterpart
  21. GRB 150902A: Swift ToO observations
  22. GRB 150902A: Fermi-LAT detection
  23. GRB 150831B: Swift/UVOT Upper Limits
  24. Konus-Wind observation of GRB 150831A
  25. GRB 150901A: Swift detection of a burst
  26. GRB 150821A: Flattening in the UVOT light curve
  27. GRB 150831B: Swift-BAT refined analysis
  28. GRB 150831B: Swift-XRT refined Analysis
  29. GRB 150831B: MASTER-IAC early optical observations
  30. GRB 150831B: Fermi GBM detection
  31. GRB 150831A: GROND Upper Limits
  32. GRB 150831A: Swift/UVOT Upper Limits
  33. GRB 150831B: Swift-XRT observations
  34. GRB 150831A: Swift-XRT refined Analysis
  35. GRB 150831B: Swift detection of a probable burst
  36. GRB 150831A: Swift-BAT refined analysis
  37. GRB 150831A: Enhanced Swift-XRT position
  38. GRB 150831A: optical upper limit ISON-SSO
  39. GRB 150831A: Swift detection of a short burst
  40. GRB 150818A: possible SN rise in light curve of Mondy observations
  41. Konus-Wind observation of GRB 150821A
  42. GRB 150821A: LCOGT Siding Springs early observations
  43. Konus-Wind observation of GRB 150818A
  44. GRB 150821A: LCOGT Sutherland observations
  45. GRB 150821A, Swift-BAT refined analysis
  46. GRB 150821A: GROND afterglow observations
  47. GRB 150821A: Swift-XRT refined Analysis
  48. GRB 150819A: Mondy and TSHAO optical upper limits
  49. GRB 150821A: Swift/UVOT Detection
  50. GRB 150821A: Enhanced Swift-XRT position
  51. GRB 150821A: Fermi GBM detection
  52. GRB 150818A: continued Mondy optical observations
  53. Swift Trigger 652824 is due to noise
  54. GRB 150821A: Swift detection of a burst with an optical afterglow
  55. Swift Trigger 652824: Is most likely a noise fluctuation in the direction of M31
  56. GRB 120729A: KAIT Optical Observations
  57. KAIT Optical Upper Limits for GRB 120422A, 120724A, 120803B, 120911A, and 120923A
  58. GRB 150818A: Mondy optical observations
  59. GRB 150818A: 10.4m GTC spectroscopy and host galaxy
  60. GRB 150818A: Mondy optical observations
  61. GRB 150819A: RATIR Optical Observations
  62. GRB 150819A: Swift-XRT refined Analysis
  63. GRB 150819A: Swift-BAT refined analysis
  64. GRB 150819A: MASTER-IAC early upper limit
  65. GRB 150819A: Swift/UVOT Upper Limits
  66. GRB 150819A: Enhanced Swift-XRT position
  67. GRB 150818A: Swift-XRT update, correction to GCN 18162
  68. GRB 150819A: Prompt enhanced Swift-XRT position
  69. GRB 150819A: Swift detection of a burst
  70. GRB 150818A: Swift-XRT refined Analysis
  71. GRB 150818A: Swift/UVOT Detection
  72. GRB 150817A: AAO optical observations
  73. GRB 150818A: Enhanced Swift-XRT position
  74. GRB 150817A: LCOGT observations
  75. GRB 150818A: Swift-BAT refined analysis
  76. GRB 150817A: Continued RATIR Optical Observations - Afterglow Confirmation
  77. GRB 150818A: Swift/UVOT candidate afterglow
  78. GRB 150817A: P60 Observations
  79. GRB 150818A: Swift detection of a burst
  80. GRB 150817A: Swift/UVOT Upper Limits
  81. GRB 150817A: Fermi GBM observation
  82. GRB 150817A: Swift-BAT refined analysis
  83. GRB 150817A: Swift-XRT refined Analysis
  84. GRB 150817A: Enhanced Swift-XRT position
  85. GRB 150817A: RATIR Optical Afterglow Candidate
  86. GRB 150817A: Swift detection of a burst
  87. Swift Trigger 652046 is a particle shower event
  88. Swift Trigger 652046 is probably not a GRB
  89. GRB 150811A: KAIT Refined Analysis
  90. GRB 150811A: Swift/UVOT further observations
  91. GRB 150811A: Swift-BAT refined analysis
  92. GRB 150811A: Swift-XRT refined Analysis
  93. GRB 150811A: Enhanced Swift-XRT position
  94. GRB 150811A: Swift/UVOT Detection
  95. GRB 150811A: KAIT optical candidate
  96. GRB 150811A: RATIR Optical Afterglow Detection
  97. GRB 150811A: Swift detection of a burst
  98. GRB 150727A: IRSF NIR observation
  99. GRB 150801A: Swift-XRT observations
  100. GRB 150801B: Swift/UVOT Upper Limits

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