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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"

28099 results found.

  1. GRB 150902A: Swift-XRT afterglow detection
  2. ANTARES neutrino detection: ANU 2.3m and Kepler K2 Observations of the Swift x-ray source
  3. GRB 150902A: Swift/UVOT Upper Limits
  4. GRB 150902A: Swift-XRT observations
  5. GRB 150831A: 9.8 GHz VLA upper limits
  6. GRB 150901A, Swift-BAT refined analysis
  7. ANTARES neutrino detection and possible Swift X-ray counterpart
  8. GRB 150902A: Fermi-LAT detection
  9. GRB 150831B: Swift/UVOT Upper Limits
  10. Konus-Wind observation of GRB 150831A
  11. GRB 150901A: Swift detection of a burst
  12. GRB 150821A: Flattening in the UVOT light curve
  13. GRB 150831B: Swift-BAT refined analysis
  14. GRB 150831B: Swift-XRT refined Analysis
  15. GRB 150831B: Fermi GBM detection
  16. GRB 150831A: GROND Upper Limits
  17. GRB 150831A: Swift/UVOT Upper Limits
  18. GRB 150831B: Swift-XRT observations
  19. GRB 150831A: Swift-XRT refined Analysis
  20. GRB 150831A: Swift-BAT refined analysis
  21. GRB 150831A: Enhanced Swift-XRT position
  22. GRB 150831A: optical upper limit ISON-SSO
  23. GRB 150831A: Swift detection of a short burst
  24. GRB 150824A: Fermi GBM detection
  25. GRB 150821A: LCOGT Siding Springs early observations
  26. Konus-Wind observation of GRB 150818A
  27. GRB 150821A: LCOGT Sutherland observations
  28. GRB 150821A, Swift-BAT refined analysis
  29. GRB 150821A: GROND afterglow observations
  30. GRB 150821A: Swift-XRT refined Analysis
  31. GRB 150819A: Mondy and TSHAO optical upper limits
  32. GRB 150821A: Swift/UVOT Detection
  33. GRB 150821A: Enhanced Swift-XRT position
  34. GRB 150821A: Swift detection of a burst with an optical afterglow
  35. GRB150819A: NOT imaging
  36. GRB 150818A: Continued NOT monitoring - afterglow confirmation
  37. GRB 150819B: Fermi GBM detection
  38. GRB 150818A: 10.4m GTC spectroscopy and host galaxy
  39. GRB 150818A: Mondy optical observations
  40. GRB 150818A: MITSuME Ishigakijima upper limits
  41. GRB 150819A: RATIR Optical Observations
  42. GRB 150819A: Swift-XRT refined Analysis
  43. GRB 150819A: Swift-BAT refined analysis
  44. GRB 150819A: MASTER-IAC early upper limit
  45. GRB 150819A: Swift/UVOT Upper Limits
  46. GRB 150819A: Enhanced Swift-XRT position
  47. GRB150818A: NOT imaging
  48. GRB 150819A: Swift detection of a burst
  49. GRB 150818A: Swift-XRT refined Analysis
  50. GRB 150818A: Swift/UVOT Detection
  51. GRB 150817A: AAO optical observations
  52. GRB 150818A: Enhanced Swift-XRT position
  53. GRB 150817A: LCOGT observations
  54. GRB 150818A: Swift-BAT refined analysis
  55. GRB 150817A: Continued RATIR Optical Observations - Afterglow Confirmation
  56. GRB 150818A: Swift/UVOT candidate afterglow
  57. GRB 150818A: Swift detection of a burst
  58. GRB 150817A: Swift/UVOT Upper Limits
  59. GRB 150817A: Swift-BAT refined analysis
  60. GRB 150817A: Swift-XRT refined Analysis
  61. GRB 150817A: Enhanced Swift-XRT position
  62. GRB 150817A: Continued RATIR Observations, Revised Candidate
  63. GRB 150817A: RATIR Optical Afterglow Candidate
  64. GRB 150817A: Swift detection of a burst
  65. GRB 150811A: Continued RATIR Observations
  66. GRB 150811A: Continued RATIR Observations
  67. Swift Trigger 652046 is probably not a GRB
  68. GRB 150811A: Continued RATIR Observations
  69. GRB 150811B: Fermi GBM detection
  70. GRB 150811A: Swift-BAT refined analysis
  71. GRB 150811A: SAO RAS optical observations
  72. GRB 150811A: Swift-XRT refined Analysis
  73. GRB 150810A: Fermi GBM detection
  74. GRB 150811A: Enhanced Swift-XRT position
  75. GRB 150811A: LCOGT-McDonald afterglow detection
  76. GRB 150811A: Swift/UVOT Detection
  77. GRB 150811A: RATIR Optical Afterglow Detection
  78. GRB 150811A: Swift detection of a burst
  79. Fermi GBM GRB Trigger 460608875: iPTF P48 Observations
  80. GRB 150728A: TNG optical observations
  81. GRB 150727A: IRSF NIR observation
  82. GRB 150801A: Swift-XRT observations
  83. GRB 150801B: Swift/UVOT Upper Limits
  84. GRB 150801B: Swift-BAT refined analysis
  85. GRB 150801B: Swift-XRT refined Analysis
  86. GRB 150801B: Enhanced Swift-XRT position
  87. Fermi GBM GRB Trigger 458852670: iPTF P48 Observations
  88. GRB 150721A (Fermi GBM Trigger 459150552): iPTF P48 Observations
  89. GRB 150801B: Swift detection of a burst
  90. GRB 150801A: MAXI/GSC detection
  91. GRB 150724B: Swift-XRT afterglow detection
  92. GRB 150424A: HST imaging
  93. GRB 150728A: Continued RATIR Optical Observations
  94. GRB 150728A: TSHAO optical observations
  95. GRB 150728A: RATIR Optical Observations
  96. GRB 150727A: Continued RATIR Optical Observations - Fading
  97. GRB 150728A: AAO optical observations
  98. GRB 150728A: Swift/UVOT Upper Limits
  99. GRB 150728A: Swift-BAT refined analysis
  100. GRB 150728A: FTN observations

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