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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

27554 results found.

  1. GRB 081011: Swift/XRT detection
  2. GRB 081008, SMARTS optical/IR afterglow observations
  3. GRB 081011: Swift detection of a burst
  4. GRB 081007: Radio Detection
  5. GRB 081007: Rapid PROMPT Detections
  6. GRB 081008: VLT redshift confirmation
  7. GRB 081008: Swift-XRT Refined Analysis
  8. GRB081008: Swift/UVOT observations
  9. GRB 081008: Enhanced Swift-XRT position
  10. GRB 081008: VLT/FORS2 spectroscopy
  11. GRB 081008: Swift detection of a burst with optical afterglow
  12. GRB 081008: ROTSE-III Detection of Optical Counterpart
  13. GRB081006B: Fermi GBM detection
  14. GRB081006: Fermi GBM detection
  15. GRB081007: Swift/UVOT Observations
  16. GRB 081007, SMARTS optical afterglow observations
  17. GRB 081007: Swift-XRT Team refined analysis
  18. GRB 081007: Enhanced Swift-XRT position
  19. GRB 081007, Faulkes Telescope North optical observations
  20. GRB 081007, SMARTS optical/IR afterglow observations
  21. GRB 081007: Swift detection of a burst with optical afterglow
  22. GRB081003C: GLAST Burst Monitor detection
  23. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  24. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  25. GRB 081003B: Swift-XRT upper limit
  26. GRB 081003A: OSN optical observations
  27. GRB 081001: Further observations from OSN
  28. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  29. GRB081003B: Optical limits from Spain
  30. GRB 081003A: Swift-XRT Team position and analysis
  31. GRB 080928: Fermi GBM detection
  32. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  33. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  34. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  35. Trigger 330353: Swift detection of a Galactic short soft burst
  36. GRB 081001: Observations from OSN
  37. GRB 081001: Swift UVOT Observations
  38. GRB 081001: Swift-XRT position
  39. GRB080928: redshift retraction
  40. GRB 080928: Watcher observations
  41. GRB 080927: Fermi GBM detection
  42. GRB 080928: VLT redshift
  43. GRB 080928: Swift-XRT refined analysis
  44. GRB 080928: GROND DETECTION
  45. GRB 080928: Enhanced Swift-XRT position
  46. GRB 080928, Swift-BAT initial refined analysis
  47. GRB 080928: Swift detection of a burst with an optical counterpart
  48. GRB 080925: Fermi GBM Detection
  49. GRB 080920: Fermi GBM detection
  50. Swift trigger 325707: Swift-XRT upper limit
  51. Swift detection of a possible GRB (trigger 325707)
  52. GRB 080922: Swift/UVOT Upper Limits
  53. GRB080922: Swift-XRT upper limit
  54. GRB 080913B: Fermi GBM detection
  55. Trigger 324561: IGR J08408-4503 detected by Swift
  56. GRB 080919: Swift/UVOT Refined Analysis
  57. GRB 080919: Swift-XRT refined analysis
  58. GRB 080916C: IRSF/SIRUS NIR Observation
  59. GRB 080916C: GROND Confirmation of the Optical Afterglow
  60. GRB 080916C: GROND Confirmation of the Optical Afterglow
  61. GRB 080919: REM NIR observations
  62. GRB 080919: Swift detection of a short burst
  63. GRB 080915A: GROND upper limits
  64. GRB 080916A: GROND lightcurve
  65. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  66. GRB 080916A: Rapid PROMPT Observations
  67. GRB 080916A: Fermi GBM detection
  68. GRB 080916C: Swift UVOT Refined Analysis
  69. GRB 080916C: Swift XRT refined analysis
  70. GRB 080916B: Swift-XRT refined analysis
  71. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  72. GRB 080916C: Enhanced XRT position
  73. GRB 080916C: Swift/XRT detection of possible afterglow
  74. GRB 080916B: Swift UVOT Refined Analysis
  75. GRB080916A: Refined Swift/UVOT Observations
  76. GRB 080915a, SMARTS optical/IR observations
  77. GRB 080916B: Enhanced Swift-XRT position
  78. GRB 080916C: Fermi LAT observation
  79. GRB 080916C: Fermi GBM Detection
  80. GRB 080916A: Swift XRT refined analysis
  81. GRB 080916B: Swift-XRT afterglow detection
  82. GRB 080916A: Enhanced Swift-XRT position
  83. GRB 080916B: Swift detection of a burst
  84. GRB 080916: REM detection of the NIR afterglow
  85. GRB 080916: REM candidate afterglow
  86. GRB 080916: Swift detection of a burst with optical afterglow
  87. GRB 080912 : Fermi GBM detection
  88. GRB 080915B: Swift detection of a burst
  89. GRB 080915: REM NIR early observations
  90. GRB 080915: Swift/UVOT Upper Limits
  91. GRB 080915: Swift-XRT afterglow detection and analysis
  92. GRB 080915: Swift detection of a burst
  93. GRB 080913: Swift-XRT refined analysis
  94. GRB 080913: VLT/FORS spectrum
  95. GRB080913: Swift/UVOT Upper Limits
  96. GRB 080913: GROND photo-z
  97. GRB 080913: VLT/FORS2 observations
  98. GRB 080913: REM NIR early observations
  99. GRB 080913: Enhanced Swift-XRT position
  100. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate

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