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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"

37576 results found.

  1. IPN Triangulation of GRB 150811B
  2. GRB 150811A: Continued RATIR Observations
  3. GRB 150811A: Swift/UVOT further observations
  4. GRB 150811B: Fermi GBM detection
  5. GRB 150811A: Swift-BAT refined analysis
  6. GRB 150811A: SAO RAS optical observations
  7. GRB 150811A: Swift-XRT refined Analysis
  8. GRB 150810A: Fermi GBM detection
  9. GRB 150811A: P60 Observations
  10. GRB 150811A: Enhanced Swift-XRT position
  11. GRB 150811A: LCOGT-McDonald afterglow detection
  12. GRB 150811A: Swift/UVOT Detection
  13. GRB 150811A: KAIT optical candidate
  14. GRB 150811A: RATIR Optical Afterglow Detection
  15. GRB 150811A: Swift detection of a burst
  16. Fermi GBM GRB Trigger 460608875: iPTF P48 Observations
  17. Fermi GBM trigger 150807969 is not a GRB
  18. Fermi GBM trigger 150806450 is not a GRB
  19. GRB 150728A: TNG optical observations
  20. Fermi GBM trigger 150805556 is not a GRB
  21. GRB 150727A: IRSF NIR observation
  22. GRB 150801A: Swift-XRT observations
  23. GRB 150801B: Swift/UVOT Upper Limits
  24. GRB 150801B: Swift-BAT refined analysis
  25. GRB 150801B: Swift-XRT refined Analysis
  26. GRB 150801B: Enhanced Swift-XRT position
  27. Fermi GBM triggers 150730606 150731173 and 150801590 are not due to GRBs
  28. Fermi GBM GRB Trigger 458852670: iPTF P48 Observations
  29. GRB 150721A (Fermi GBM Trigger 459150552): iPTF P48 Observations
  30. GRB 150801B: Swift detection of a burst
  31. GRB 150801A: Tiled Swift observations
  32. GRB 150801A: MAXI/GSC detection
  33. GRB 150724B: Swift-XRT afterglow detection
  34. GRB 150424A: HST imaging
  35. GRB 150728A: Continued RATIR Optical Observations
  36. GRB 150728A: TSHAO optical observations
  37. GRB 150728A: RATIR Optical Observations
  38. GRB 150727A: Continued RATIR Optical Observations - Fading
  39. GRB 150728A: AAO optical observations
  40. GRB 150728A: Swift-XRT refined Analysis
  41. GRB 150728A: Swift/UVOT Upper Limits
  42. GRB 150728A: Swift-BAT refined analysis
  43. GRB 150728A: FTN observations
  44. GRB 150727A: RATIR Optical Observations
  45. GRB 150728A: Enhanced Swift-XRT position
  46. GRB 150728A: Swift detection of a GRB
  47. GRB 150727A: Swift-BAT refined analysis
  48. GRB 150727A: Watcher optical upper limit
  49. GRB 150727A: Swift/UVOT Detection
  50. GRB 150727A: LCOGT-Cerro Tololo observations
  51. GRB 150727A: Swift-XRT refined Analysis
  52. GRB 150727A: Fermi GBM detection
  53. GRB 150727A: VLT/X-shooter redshift
  54. GRB 150727A: Enhanced Swift-XRT position
  55. GRB 150724B: Continued RATIR Optical Observations
  56. GRB 150724B: MASTER upper limit
  57. GRB 150727A: Swift detection of a burst with an optical counterpart
  58. GRB 150724B: Swift/UVOT Detection
  59. Konus-Wind observation of GRB 150724B
  60. Konus-Wind observation of GRB 150725A
  61. GRB 150724B: RATIR Optical Observations
  62. GRB 150724B: Swift-XRT observations
  63. GRB 150724B: Swift ToO observations
  64. GRB 150724B: Fermi GBM detection
  65. GRB 150724B: Fermi-LAT detection
  66. Fermi GBM trigger 150725291 is not a GRB
  67. GRB 150725A: MAXI/GSC detection
  68. GRB 150724A: Swift-XRT refined Analysis
  69. GRB 150724A: Swift/UVOT Upper Limits
  70. GRB 150724A: Swift-BAT refined analysis
  71. GRB 150724A: Enhanced Swift-XRT position
  72. GRB 150724A: Prompt enhanced Swift-XRT position
  73. Trigger 650140: Swift detection of IGR J00291+5934
  74. GRB 150724A: Swift detection of a burst
  75. GRB 150722A: LCOGT-Sutherland observations
  76. GRB 150722A: Swift-BAT refined analysis
  77. GRB 150722A: Swift-XRT refined Analysis
  78. GRB 150722A: Swift/UVOT Upper Limits
  79. GRB 150720A: Swift/UVOT Upper Limits
  80. GRB 150722A: Enhanced Swift-XRT position
  81. GRB 150722A: Swift-XRT observations
  82. GRB 150722A: Swift detection of a burst
  83. GRB 150721A: Fermi GBM detection
  84. GRB 150720A: Enhanced Swift-XRT position
  85. GRB 150720A: Swift-XRT refined Analysis
  86. GRB 150720A: Swift-BAT refined analysis
  87. Swift Trigger 649706: a possible GRB or bright Galactic transient
  88. GRB 150716A: KAIT Optical Upper Limit
  89. GRB 150711A: Burakan-ISON optical observations
  90. GRB 150716A: Swift-BAT refined analysis
  91. GRB 150716A: Swift/UVOT Upper Limits
  92. GRB 150716A: Continued RATIR Optical Observations
  93. GRB 150716A: Swift-XRT refined Analysis
  94. GRB 150716A: P60 Candidate Optical Afterglow
  95. GRB 150716A: RATIR Optical Observations
  96. GRB 150716A: Swift detection of a burst
  97. Fermi GBM triggers bn150715759 and bn150715817 are not due to GRBs
  98. Fermi Gamma-ray Burst Monitor triggers that are not GRBs
  99. GRB 150710B: Swift-XRT afterglow detection
  100. Fermi GBM trigger 458312518/150711543 is not a GRB

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