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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"

6805 results found.

  1. GRB 100425A: Swift XRT refined analysis
  2. GRB 100424A: PAIRITEL NIR Upper Limits
  3. GRB 100424A: Prompt enhanced Swift-XRT position.
  4. GRB 100418A: Continued PAIRITEL NIR Observations
  5. GRB 100418A: Continuing Swift/UVOT Observations
  6. GRB 100418A: further GROND observations and light curve fit
  7. GRB 100418A: RTT150 optical observations
  8. GRB 100420A: XRT refined analysis
  9. GRB 100418A: RTT150 observations during the optical afterglow maximum
  10. GRB 100418A PAIRITEL NIR Observations
  11. GRB 100418A: Swift-XRT Refined Analysis
  12. GRB100414A: SAO RAS optical observations
  13. GRB 100413B: Swift Confirmation of Burst
  14. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  15. GRB 100414A: Fermi GBM detection
  16. GRB100414A: Fermi LAT detection
  17. GRB 100413A: Swift/UVOT Upper Limits
  18. GRB 100413A: Swift-XRT Refined Analysis
  19. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  20. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  21. GRB 100316A: R-band limit
  22. GRB 100331B: Swift/XRT possible afterglow candidate
  23. GRB 100325A: Fermi LAT detection
  24. GRB 100322A: Fermi GBM detection
  25. SGR 1833-0832: Archival Chandra Observations
  26. Possible pulsation period in SGR 1833-0832
  27. Discovery of the Spin Period of SGR 1833-0832
  28. Probable SGR 1833-0832: Swift-XRT refined analysis
  29. Swift-XRT refined position of the probable new SGR 1833-0832
  30. GRB 100316D: Pre-burst emission measured by BAT
  31. GRB 100316D: Swift XRT enhanced position and further refined analysis
  32. GRB 100316B: Swift-XRT refined analysis
  33. GRB 100316D: Swift-BAT refined analysis
  34. GRB 100316C: Swift-XRT team refined analysis
  35. GRB 100316A: Swift-XRT refined analysis
  36. GRB 100305A: Swift-XRT refined analysis
  37. GRB 100305A: PAIRITEL NIR Upper Limits
  38. GRB 100302A: Swift-XRT refined analysis
  39. GRB 100224B: Fermi GBM detection
  40. GRB 100225A: Fermi LAT detection
  41. GRB 100225A: Fermi GBM detection
  42. GRB 100223A: Fermi GBM detection
  43. GRB 100219A: XRT refined analysis
  44. GRB 100216A: Swift/UVOT Observations
  45. GRB 100216A: XRT Refined Analysis
  46. GRB 100213B: PAIRITEL NIR Upper Limits
  47. GRB 100213B: Swift XRT refined analysis
  48. GRB 100212A: Swift XRT refined analysis
  49. GRB 100206A: PAIRITEL Photometry of Host Candidate
  50. GRB 100206A: NOT NIR observations
  51. GRB 100206A: Swift-XRT refined analysis
  52. GRB 100205A: Swift XRT refined analysis
  53. GRB 100203A: Swift XRT and UVOT refined analyses
  54. Short X-ray Transient detected by MAXI/GSC
  55. GRB 100115A: Swift-XRT refined analysis
  56. GRB 100117A: Swift-XRT refined analysis
  57. GRB 100116A: Fermi LAT detection
  58. GRB 100115A: Swift-XRT candidate afterglow
  59. GRB 100111A: PAIRITEL NIR Upper Limits
  60. GRB 100103A: Swift-XRT team refined analysis
  61. GRB 100103A: Swift/XRT position
  62. Swift Trigger 381591 is probably not a burst
  63. GRB 091230: Swift-XRT observation
  64. Swift Trigger 381434 is not a GRB
  65. GRB 091221 : IRSF NIR upper limit
  66. GRB 091117: Swift-XRT late time observations
  67. GRB 091221: Swift-XRT refined analysis
  68. GRB 091221: Enhanced Swift-XRT position
  69. Swift trigger 379449 (possible GRB) is not a burst
  70. GRB091208A: Swift/UVOT refined analysis
  71. GRB 091208A: Swift-XRT observations
  72. GRB 091208B: Swift-XRT refined analysis
  73. GRB091202: Swift-XRT refined analysis
  74. GRB 091130B: Swift-XRT team refined analysis
  75. Swift trigger 377436 (possible GRB 091130A) is not a burst
  76. GRB 091127: Radio observations
  77. GRB 091127: Swift-XRT afterglow detection and analysis
  78. GRB 091117: Swift-XRT observations
  79. GRB 091117: Evidence for Variability of XRT Source #1
  80. GRB 091117: Swift XRT refined analysis
  81. GRB091111: Swift XRT refined analysis
  82. GRB 091031: Fermi LAT detection of a faint burst
  83. GRB 091109B: Swift-XRT Team refined analysis
  84. GRB 091109: Swift-XRT refined analysis
  85. GRB 091104: Swift XRT Refined Analysis
  86. GRB091026 : IRSF NIR upper limit
  87. Fermi LAT Upper Limits on GRB 091010
  88. GRB 091102: Swift-XRT refined analysis
  89. GRB 091024: Fermi LAT upper limits
  90. GRB 091029: Swift XRT refined analysis
  91. GRB091024 optical observations
  92. GRB 091026: Swift/UVOT Upper Limits
  93. GRB 091026: Swift-XRT refined analysis
  94. GRB 091020: Early TLS Multicolor detections, red afterglow
  95. GRB091024: VRcIc Afterglow Observations
  96. GRB 091024: Fermi GBM Observations
  97. GRB 091024: Swift-XRT team refined analysis
  98. GRB 091020: Swift-XRT refined analysis
  99. GRB 091018: Swift XRT refined analysis
  100. GRB 091018: miniTAO/ANIR Observations

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