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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"

27168 results found.

  1. GRB 150831B: Swift detection of a probable burst
  2. GRB 150831A: Swift-BAT refined analysis
  3. GRB 150831A: optical upper limit ISON-SSO
  4. GRB 150831A: Swift detection of a short burst
  5. Fermi GBM trigger 150829183 is not a GRB
  6. Fermi GBM trigger 150828520 is not a GRB
  7. Fermi GBM trigger 150827524 is not a GRB
  8. Fermi GBM trigger 150826536 is not a GRB
  9. GRB 150824A: Fermi GBM detection
  10. Konus-Wind observation of GRB 150821A
  11. GRB 150821A: LCOGT Siding Springs early observations
  12. Konus-Wind observation of GRB 150818A
  13. GRB 150821A: LCOGT Sutherland observations
  14. GRB 150821A, Swift-BAT refined analysis
  15. GRB 150821A: GROND afterglow observations
  16. GRB 150821A: Swift-XRT refined Analysis
  17. GRB 150821A: Swift/UVOT Detection
  18. GRB 150821A: Fermi GBM detection
  19. Swift Trigger 652824 is due to noise
  20. GRB 150821A: VLT/X-shooter redshift
  21. GRB 150821A: Swift detection of a burst with an optical afterglow
  22. Swift Trigger 652824: Is most likely a noise fluctuation in the direction of M31
  23. GRB 150819B: Fermi GBM detection
  24. IPN Triangulation of GRB 150819B (short / very intense)
  25. GRB 150818A: Mondy optical observations
  26. GRB 150819A: RATIR Optical Observations
  27. GRB 150819A: Swift-XRT refined Analysis
  28. GRB 150819A: Swift-BAT refined analysis
  29. GRB 150819A: MASTER-IAC early upper limit
  30. GRB 150819A: Swift/UVOT Upper Limits
  31. GRB 150818A: Swift-XRT update, correction to GCN 18162
  32. GRB 150819A: Swift detection of a burst
  33. GRB 150818A: Swift-XRT refined Analysis
  34. GRB 150818A: Swift/UVOT Detection
  35. GRB 150817A: LCOGT observations
  36. GRB 150818A: Swift-BAT refined analysis
  37. GRB 150817A: Continued RATIR Optical Observations - Afterglow Confirmation
  38. GRB 150818A: Swift/UVOT candidate afterglow
  39. GRB 150817A: P60 Observations
  40. GRB 150818A: Swift detection of a burst
  41. MASTER OT inside bright ESO240-010 galaxy detection during FERMI trigger GRB150816.83 inspection
  42. GRB 150817A: Swift/UVOT Upper Limits
  43. GRB 150817A: Fermi GBM observation
  44. GRB 150817A: Swift-BAT refined analysis
  45. GRB 150817A: Swift-XRT refined Analysis
  46. GRB 150817A: Continued RATIR Observations, Revised Candidate
  47. GRB 150817A: RATIR Optical Afterglow Candidate
  48. GRB 150817A: Swift detection of a burst
  49. Fermi GBM Trigger 150815694 is not a GRB
  50. GRB 150811A: Continued RATIR Observations
  51. GRB 150811A: Continued RATIR Observations
  52. GBM Trigger 150813665 is not a GRB
  53. Swift Trigger 652046 is a particle shower event
  54. Swift Trigger 652046 is probably not a GRB
  55. GRB 150811A: Continued RATIR Observations
  56. GRB 150811A: Swift/UVOT further observations
  57. GRB 150811B: Fermi GBM detection
  58. GRB 150811A: Swift-BAT refined analysis
  59. GRB 150811A: SAO RAS optical observations
  60. GRB 150811A: Swift-XRT refined Analysis
  61. GRB 150810A: Fermi GBM detection
  62. GRB 150811A: P60 Observations
  63. GRB 150811A: LCOGT-McDonald afterglow detection
  64. GRB 150811A: Swift/UVOT Detection
  65. GRB 150811A: RATIR Optical Afterglow Detection
  66. GRB 150811A: Swift detection of a burst
  67. Fermi GBM GRB Trigger 460608875: iPTF P48 Observations
  68. Fermi GBM trigger 150807969 is not a GRB
  69. Fermi GBM trigger 150806450 is not a GRB
  70. Fermi GBM trigger 150805556 is not a GRB
  71. GRB 150801B: Swift/UVOT Upper Limits
  72. GRB 150801B: Swift-BAT refined analysis
  73. GRB 150801B: Swift-XRT refined Analysis
  74. Fermi GBM triggers 150730606 150731173 and 150801590 are not due to GRBs
  75. Fermi GBM GRB Trigger 458852670: iPTF P48 Observations
  76. GRB 150721A (Fermi GBM Trigger 459150552): iPTF P48 Observations
  77. GRB 150801B: Swift detection of a burst
  78. GRB 150424A: HST imaging
  79. GRB150724B: Retraction of the uvot detection
  80. GRB 150728A: Continued RATIR Optical Observations
  81. GRB 150728A: RATIR Optical Observations
  82. GRB 150727A: Continued RATIR Optical Observations - Fading
  83. GRB 150728A: Swift-XRT refined Analysis
  84. GRB 150728A: Swift/UVOT Upper Limits
  85. GRB 150728A: Swift-BAT refined analysis
  86. GRB 150728A: FTN observations
  87. GRB 150727A: RATIR Optical Observations
  88. GRB 150728A: Swift detection of a GRB
  89. GRB 150727A: Swift-BAT refined analysis
  90. GRB 150727A: Watcher optical upper limit
  91. GRB 150727A: Swift/UVOT Detection
  92. GRB 150727A: LCOGT-Cerro Tololo observations
  93. GRB 150727A: Swift-XRT refined Analysis
  94. GRB 150727A: Fermi GBM detection
  95. GRB 150724B: Continued RATIR Optical Observations
  96. GRB 150724B: MASTER upper limit
  97. GRB 150727A: Swift detection of a burst with an optical counterpart
  98. GRB 150724B: Swift/UVOT Detection
  99. Konus-Wind observation of GRB 150724B
  100. Konus-Wind observation of GRB 150725A

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