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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"

35341 results found.

  1. GRB 081003A: OSN optical observations
  2. GRB 081001: Further observations from OSN
  3. GRB081003B: Optical limits from Spain
  4. GRB 081003A: Swift-XRT Team position and analysis
  5. GRB 081003B: a long GRB detected with INTEGRAL
  6. GRB 080928: Fermi GBM detection
  7. GRB 081003: A long GRB discovered by INTEGRAL
  8. GRB 081001: Observations from OSN
  9. GRB 080925: Suzaku WAM observation of the prompt emission
  10. GRB 081001: Swift UVOT Observations
  11. GRB 081001: Swift-XRT position
  12. GRB081001: optical limit from ASH-Centurion
  13. GRB081001: SuperAGILE Localization of a long GRB
  14. GRB080928: redshift retraction
  15. GRB 080928: Watcher observations
  16. GRB 080927: Fermi GBM detection
  17. GRB 080928: VLT redshift
  18. GRB080928: Gemini-South Absorption Redshift
  19. GRB 080928: Swift-XRT refined analysis
  20. GRB 080928: Swift/UVOT observations
  21. GRB 080928, Swift-BAT final refined analysis
  22. GRB 080928: GROND DETECTION
  23. GRB 080928: Enhanced Swift-XRT position
  24. GRB 080928, Swift-BAT initial refined analysis
  25. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  26. GRB 080928: Swift detection of a burst with an optical counterpart
  27. GRB 080925: Fermi GBM Detection
  28. GRB 080920: Fermi GBM detection
  29. Swift-BAT trigger 325707 is not a GRB
  30. Swift trigger 325707: Swift/UVOT Upper Limits
  31. Swift detection of a possible GRB (trigger 325707)
  32. GRB080916A: Suzaku WAM observation of the prompt emission
  33. GRB 080922: Swift/UVOT Upper Limits
  34. GRB080922: Swift-XRT upper limit
  35. GRB080922: A long GRB detected by INTEGRAL
  36. GRB 080913B: Fermi GBM detection
  37. GRB 080916C: Fermi GBM Spectral Analysis
  38. GRB 080919: Swift/UVOT Refined Analysis
  39. GRB 080919: Swift-XRT refined analysis
  40. GRB 080919, Swift-BAT refined analysis
  41. GRB 080916C: IRSF/SIRUS NIR Observation
  42. GRB 080916C: GROND Confirmation of the Optical Afterglow
  43. GRB 080916C: GROND Confirmation of the Optical Afterglow
  44. GRB 080919: REM NIR observations
  45. GRB 080919: Swift detection of a short burst
  46. GRB 080915A: GROND upper limits
  47. GRB 080916A: GROND lightcurve
  48. GRB 080916A: Rapid PROMPT Observations
  49. GRB 080916A: Fermi GBM detection
  50. GRB 080916C: Swift UVOT Refined Analysis
  51. GRB 080916C: Swift XRT refined analysis
  52. GRB 080916B: Swift-XRT refined analysis
  53. Konus-Wind observation of GRB 080916A
  54. Konus-Wind observation of GRB 080916C
  55. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  56. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  57. GRB 080916C: Enhanced XRT position
  58. GRB080916A: Spectroscopic redshift
  59. GRB 080916C: Swift/XRT detection of possible afterglow
  60. GRB 080916B: Swift UVOT Refined Analysis
  61. IPN Triangulation and Energy Spectrum of GRB080916C
  62. GRB 080916B, Swift-BAT refined analysis
  63. GRB080916A: Refined Swift/UVOT Observations
  64. GRB 080915a, SMARTS optical/IR observations
  65. GRB 080916B: Enhanced Swift-XRT position
  66. GRB 080916C: Fermi LAT observation
  67. GRB 080916C: Fermi GBM Detection
  68. GRB 080916A: Swift XRT refined analysis
  69. GRB 080916A, Swift-BAT refined analysis
  70. GRB 080916B: Swift-XRT afterglow detection
  71. GRB 080916A: Enhanced Swift-XRT position
  72. GRB 080916B: Swift detection of a burst
  73. GRB 080916: REM detection of the NIR afterglow
  74. GRB 080916: REM candidate afterglow
  75. GRB 080916: Swift detection of a burst with optical afterglow
  76. GRB 080915B, Swift-BAT refined analysis
  77. GRB 080912 : Fermi GBM detection
  78. GRB 080915B: Swift detection of a burst
  79. GRB 080915: REM NIR early observations
  80. GRB 080915: Swift/UVOT Upper Limits
  81. GRB 080915: Swift-XRT afterglow detection and analysis
  82. GRB 080915, Swift-BAT refined analysis
  83. GRB 080915: ROTSE-III Optical Limits
  84. GRB 080915: Swift detection of a burst
  85. GRB 080913: Swift-XRT refined analysis
  86. GRB 080913: VLT/FORS spectrum
  87. GRB080913: Swift/UVOT Upper Limits
  88. GRB 080913: GROND photo-z
  89. GRB 080913, Swift-BAT refined analysis
  90. GRB 080913: VLT/FORS2 observations
  91. GRB 080913: REM NIR early observations
  92. GRB 080913: Enhanced Swift-XRT position
  93. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  94. GRB 080913: Swift detection of a burst
  95. GRB 080906: Watcher observations
  96. Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
  97. GRB 080906B: Fermi GBM detection
  98. GRB 080905C: Fermi GBM detection
  99. GRB 080905B: Photometric Redshift for the 2MASS Galaxy
  100. GRB080905A: Swift/UVOT Upper Limits

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