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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"

27136 results found.

  1. GRB 150818A: Swift-XRT refined Analysis
  2. GRB 150818A: Swift/UVOT Detection
  3. GRB 150817A: LCOGT observations
  4. GRB 150818A: Swift-BAT refined analysis
  5. GRB 150817A: Continued RATIR Optical Observations - Afterglow Confirmation
  6. GRB 150818A: Swift/UVOT candidate afterglow
  7. GRB 150817A: P60 Observations
  8. GRB 150818A: Swift detection of a burst
  9. MASTER OT inside bright ESO240-010 galaxy detection during FERMI trigger GRB150816.83 inspection
  10. GRB 150817A: Swift/UVOT Upper Limits
  11. GRB 150817A: Fermi GBM observation
  12. GRB 150817A: Swift-BAT refined analysis
  13. GRB 150817A: Swift-XRT refined Analysis
  14. GRB 150817A: Continued RATIR Observations, Revised Candidate
  15. GRB 150817A: RATIR Optical Afterglow Candidate
  16. GRB 150817A: Swift detection of a burst
  17. Fermi GBM Trigger 150815694 is not a GRB
  18. GRB 150811A: Continued RATIR Observations
  19. GRB 150811A: Continued RATIR Observations
  20. GBM Trigger 150813665 is not a GRB
  21. Swift Trigger 652046 is a particle shower event
  22. Swift Trigger 652046 is probably not a GRB
  23. GRB 150811A: Continued RATIR Observations
  24. GRB 150811A: Swift/UVOT further observations
  25. GRB 150811B: Fermi GBM detection
  26. GRB 150811A: Swift-BAT refined analysis
  27. GRB 150811A: SAO RAS optical observations
  28. GRB 150811A: Swift-XRT refined Analysis
  29. GRB 150810A: Fermi GBM detection
  30. GRB 150811A: P60 Observations
  31. GRB 150811A: LCOGT-McDonald afterglow detection
  32. GRB 150811A: Swift/UVOT Detection
  33. GRB 150811A: RATIR Optical Afterglow Detection
  34. GRB 150811A: Swift detection of a burst
  35. Fermi GBM GRB Trigger 460608875: iPTF P48 Observations
  36. Fermi GBM trigger 150807969 is not a GRB
  37. Fermi GBM trigger 150806450 is not a GRB
  38. Fermi GBM trigger 150805556 is not a GRB
  39. GRB 150801B: Swift/UVOT Upper Limits
  40. GRB 150801B: Swift-BAT refined analysis
  41. GRB 150801B: Swift-XRT refined Analysis
  42. Fermi GBM triggers 150730606 150731173 and 150801590 are not due to GRBs
  43. Fermi GBM GRB Trigger 458852670: iPTF P48 Observations
  44. GRB 150721A (Fermi GBM Trigger 459150552): iPTF P48 Observations
  45. GRB 150801B: Swift detection of a burst
  46. GRB 150424A: HST imaging
  47. GRB150724B: Retraction of the uvot detection
  48. GRB 150728A: Continued RATIR Optical Observations
  49. GRB 150728A: RATIR Optical Observations
  50. GRB 150727A: Continued RATIR Optical Observations - Fading
  51. GRB 150728A: Swift-XRT refined Analysis
  52. GRB 150728A: Swift/UVOT Upper Limits
  53. GRB 150728A: Swift-BAT refined analysis
  54. GRB 150728A: FTN observations
  55. GRB 150727A: RATIR Optical Observations
  56. GRB 150728A: Swift detection of a GRB
  57. GRB 150727A: Swift-BAT refined analysis
  58. GRB 150727A: Watcher optical upper limit
  59. GRB 150727A: Swift/UVOT Detection
  60. GRB 150727A: LCOGT-Cerro Tololo observations
  61. GRB 150727A: Swift-XRT refined Analysis
  62. GRB 150727A: Fermi GBM detection
  63. GRB 150724B: Continued RATIR Optical Observations
  64. GRB 150724B: MASTER upper limit
  65. GRB 150727A: Swift detection of a burst with an optical counterpart
  66. GRB 150724B: Swift/UVOT Detection
  67. Konus-Wind observation of GRB 150724B
  68. Konus-Wind observation of GRB 150725A
  69. GRB 150724B: RATIR Optical Observations
  70. Swift Trigger 650408 is not a burst
  71. Swift 650221/IGR J00291+5934: Liverpool Telescope observations
  72. IGR J00291+5934, Swift-BAT refined analysis
  73. GRB 150724B: Fermi GBM detection
  74. GRB 150724B: Fermi-LAT detection
  75. Swift Trigger 650221 / IGR J00291+5934: MASTER-IAC OT observations
  76. Fermi GBM trigger 150725291 is not a GRB
  77. Trigger 650221: Swift detection of a IGR J00291+5934
  78. GRB 150724A: Swift-XRT refined Analysis
  79. Swift IGR J00291+5934: MASTER Optical flare detection
  80. GRB 150724A: Swift/UVOT Upper Limits
  81. IGR J00291+5934: Swift-BAT refined analysis
  82. GRB 150724A: Swift-BAT refined analysis
  83. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  84. Trigger 650140: Swift detection of IGR J00291+5934
  85. GRB 150724A: Swift detection of a burst
  86. GRB 150722A: LCOGT-Sutherland observations
  87. GRB 150722A: Swift-BAT refined analysis
  88. GRB 150722A: Swift-XRT refined Analysis
  89. GRB 150722A: Swift/UVOT Upper Limits
  90. GRB 150720A: Swift/UVOT Upper Limits
  91. GRB 150722A: Swift-XRT observations
  92. GRB 150722A: Swift detection of a burst
  93. GRB 150721A: Fermi GBM detection
  94. GRB 150720A: Swift-XRT refined Analysis
  95. GRB 150720A: Swift-BAT refined analysis
  96. Swift Trigger 649706: a possible GRB or bright Galactic transient
  97. GRB 150716A: KAIT Optical Upper Limit
  98. GRB 150711A: Burakan-ISON optical observations
  99. GRB 150716A: Swift-BAT refined analysis
  100. GRB 150716A: Swift/UVOT Upper Limits

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