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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"

27581 results found.

  1. GRB 150817A: P60 Observations
  2. GRB 150818A: Swift detection of a burst
  3. MASTER OT inside bright ESO240-010 galaxy detection during FERMI trigger GRB150816.83 inspection
  4. GRB 150817A: Swift/UVOT Upper Limits
  5. GRB 150817A: Fermi GBM observation
  6. GRB 150817A: Swift-BAT refined analysis
  7. GRB 150817A: Swift-XRT refined Analysis
  8. GRB 150817A: Continued RATIR Observations, Revised Candidate
  9. GRB 150817A: RATIR Optical Afterglow Candidate
  10. GRB 150817A: Swift detection of a burst
  11. Fermi GBM Trigger 150815694 is not a GRB
  12. GRB 150811A: Continued RATIR Observations
  13. GRB 150811A: Continued RATIR Observations
  14. GBM Trigger 150813665 is not a GRB
  15. Swift Trigger 652046 is a particle shower event
  16. Swift Trigger 652046 is probably not a GRB
  17. GRB 150811A: Continued RATIR Observations
  18. GRB 150811A: Swift/UVOT further observations
  19. GRB 150811B: Fermi GBM detection
  20. GRB 150811A: Swift-BAT refined analysis
  21. GRB 150811A: SAO RAS optical observations
  22. GRB 150811A: Swift-XRT refined Analysis
  23. GRB 150810A: Fermi GBM detection
  24. GRB 150811A: P60 Observations
  25. GRB 150811A: LCOGT-McDonald afterglow detection
  26. GRB 150811A: Swift/UVOT Detection
  27. GRB 150811A: RATIR Optical Afterglow Detection
  28. GRB 150811A: Swift detection of a burst
  29. Fermi GBM GRB Trigger 460608875: iPTF P48 Observations
  30. Fermi GBM trigger 150807969 is not a GRB
  31. Fermi GBM trigger 150806450 is not a GRB
  32. Fermi GBM trigger 150805556 is not a GRB
  33. GRB 150801B: Swift/UVOT Upper Limits
  34. GRB 150801B: Swift-BAT refined analysis
  35. GRB 150801B: Swift-XRT refined Analysis
  36. Fermi GBM GRB Trigger 458852670: iPTF P48 Observations
  37. GRB 150721A (Fermi GBM Trigger 459150552): iPTF P48 Observations
  38. GRB 150801B: Swift detection of a burst
  39. GRB 150424A: HST imaging
  40. GRB150724B: Retraction of the uvot detection
  41. GRB 150728A: Continued RATIR Optical Observations
  42. GRB 150728A: RATIR Optical Observations
  43. GRB 150727A: Continued RATIR Optical Observations - Fading
  44. GRB 150728A: Swift-XRT refined Analysis
  45. GRB 150728A: Swift/UVOT Upper Limits
  46. GRB 150728A: Swift-BAT refined analysis
  47. GRB 150728A: FTN observations
  48. GRB 150727A: RATIR Optical Observations
  49. GRB 150728A: Swift detection of a GRB
  50. GRB 150727A: Swift-BAT refined analysis
  51. GRB 150727A: Watcher optical upper limit
  52. GRB 150727A: Swift/UVOT Detection
  53. GRB 150727A: LCOGT-Cerro Tololo observations
  54. GRB 150727A: Swift-XRT refined Analysis
  55. GRB 150727A: Fermi GBM detection
  56. GRB 150724B: Continued RATIR Optical Observations
  57. GRB 150724B: MASTER upper limit
  58. GRB 150727A: Swift detection of a burst with an optical counterpart
  59. GRB 150724B: Swift/UVOT Detection
  60. Konus-Wind observation of GRB 150724B
  61. Konus-Wind observation of GRB 150725A
  62. GRB 150724B: RATIR Optical Observations
  63. Swift Trigger 650408 is not a burst
  64. Swift 650221/IGR J00291+5934: Liverpool Telescope observations
  65. IGR J00291+5934, Swift-BAT refined analysis
  66. GRB 150724B: Fermi GBM detection
  67. GRB 150724B: Fermi-LAT detection
  68. Swift Trigger 650221 / IGR J00291+5934: MASTER-IAC OT observations
  69. Fermi GBM trigger 150725291 is not a GRB
  70. Trigger 650221: Swift detection of a IGR J00291+5934
  71. GRB 150724A: Swift-XRT refined Analysis
  72. Swift IGR J00291+5934: MASTER Optical flare detection
  73. GRB 150724A: Swift/UVOT Upper Limits
  74. IGR J00291+5934: Swift-BAT refined analysis
  75. GRB 150724A: Swift-BAT refined analysis
  76. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  77. Trigger 650140: Swift detection of IGR J00291+5934
  78. GRB 150724A: Swift detection of a burst
  79. GRB 150722A: LCOGT-Sutherland observations
  80. GRB 150722A: Swift-BAT refined analysis
  81. GRB 150722A: Swift-XRT refined Analysis
  82. GRB 150722A: Swift/UVOT Upper Limits
  83. GRB 150720A: Swift/UVOT Upper Limits
  84. GRB 150722A: Swift-XRT observations
  85. GRB 150722A: Swift detection of a burst
  86. GRB 150721A: Fermi GBM detection
  87. GRB 150720A: Swift-XRT refined Analysis
  88. GRB 150720A: Swift-BAT refined analysis
  89. Swift Trigger 649706: a possible GRB or bright Galactic transient
  90. GRB 150716A: KAIT Optical Upper Limit
  91. GRB 150711A: Burakan-ISON optical observations
  92. GRB 150716A: Swift-BAT refined analysis
  93. GRB 150716A: Swift/UVOT Upper Limits
  94. GRB 150716A: Continued RATIR Optical Observations
  95. Swift trigger 649143 is not AX J1619.4-4945 or other astrophysical source
  96. GRB 150716A: Swift-XRT refined Analysis
  97. GRB 150716A: P60 Candidate Optical Afterglow
  98. GRB 150716A: RATIR Optical Observations
  99. GRB 150716A: Swift detection of a burst
  100. Trigger 649143: Swift detection of AX J1619.4-4945

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