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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"

32689 results found.

  1. GRB080913: Swift-BAT spectral lag
  2. GRB 080916A: GROND lightcurve
  3. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  4. GRB 080916A: Rapid PROMPT Observations
  5. GRB 080916A: Fermi GBM detection
  6. GRB 080916C: Swift UVOT Refined Analysis
  7. GRB 080916C: Swift XRT refined analysis
  8. GRB 080916B: Swift-XRT refined analysis
  9. Konus-Wind observation of GRB 080916A
  10. Konus-Wind observation of GRB 080916C
  11. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  12. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  13. GRB080916A: Spectroscopic redshift
  14. GRB 080916C: Swift/XRT detection of possible afterglow
  15. GRB 080916B: Swift UVOT Refined Analysis
  16. IPN Triangulation and Energy Spectrum of GRB080916C
  17. GRB 080916B, Swift-BAT refined analysis
  18. GRB080916A: Refined Swift/UVOT Observations
  19. GRB 080915a, SMARTS optical/IR observations
  20. GRB 080916C: Fermi LAT observation
  21. GRB 080916A: Swift XRT refined analysis
  22. GRB 080916A, Swift-BAT refined analysis
  23. GRB 080916: REM detection of the NIR afterglow
  24. GRB 080916: REM candidate afterglow
  25. GRB 080915B, Swift-BAT refined analysis
  26. GRB 080915: REM NIR early observations
  27. GRB 080915: Swift/UVOT Upper Limits
  28. GRB 080915: Swift-XRT afterglow detection and analysis
  29. GRB 080915, Swift-BAT refined analysis
  30. SGR 0501+4516 : P200 i-band observations
  31. GRB 080915: ROTSE-III Optical Limits
  32. GRB 080913: Swift-XRT refined analysis
  33. GRB 080913: VLT/FORS spectrum
  34. GRB080913: Swift/UVOT Upper Limits
  35. GRB 080913: GROND photo-z
  36. GRB 080913, Swift-BAT refined analysis
  37. GRB 080913: VLT/FORS2 observations
  38. GRB 080913: REM NIR early observations
  39. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  40. GRB 080906: Watcher observations
  41. Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
  42. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  43. Swift trigger 324362 (LS I +61 303 ?): XRT
  44. GRB080905A: Swift/UVOT Upper Limits
  45. GRB 080905B: Watcher optical detection
  46. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  47. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  48. GRB 080905A: Enhanced Swift-XRT position
  49. GRB 080905A: MITSuME Akeno optical upper limits
  50. Swift Trigger 324122 is again known source Swift J1842.5-1124
  51. Swift Trigger 324116 is known source again
  52. GRB 080906: Swift-XRT Refined Analysis
  53. GRB 080906, Swift-BAT refined analysis
  54. GRB 080905A: optical afterglow
  55. GRB 080906: GROND observations of the optical/NIR afterglow
  56. GRB 080905B: Swift-XRT Refined Analysis
  57. GRB 080905B: VLT redshift
  58. GRB 080905A: NOT and VLT observations
  59. GRB 080905B, Swift-BAT refined analysis
  60. GRB 080905A, Swift-BAT refined analysis
  61. GRB 080905A: Swift-XRT Refined Analysis
  62. GRB 080825C: Fermi GBM Spectral Analysis
  63. GRB080825C: Fermi-LAT observations
  64. GRB 080903: Swift/UVOT Observations
  65. GRB 080903: Swift-XRT Refined Analysis
  66. GRB 080903, Swift-BAT refined analysis
  67. GRB 080903: optical observations
  68. GRB 080903: Liverpool Telescope observations
  69. GRB 080903: Astrotel-Caucasus optical observations
  70. GRB 080903: Optical afterglow candidate
  71. GRB 080903: ROTSE-III Optical Limits
  72. Recent VLA non-detection of SGR 0501+4516
  73. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  74. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  75. nIR observations of SGR 0501+4516
  76. INTEGRAL ToO observation of SGR0501+4516
  77. SGR 0501+4516: Confirmation of the NIR counterpart
  78. GRB080828: Swift/UVOT Upper Limits
  79. SGR 0501+4516: Detection of possible optical counterpart
  80. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  81. GRB080825B: Swift/UVOT Upper Limits
  82. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  83. Swift-BAT trigger 322590 is not a GRB
  84. VLA non-detection of SGR 0501+4516
  85. Radio Detection of SGR 0501+4516: Retraction
  86. SGR 0501+4516: Decline in Activity
  87. SGR 0501+4516: Proximity to supernova remnant HB9
  88. Enhanced Swift-XRT position of SGR 0501+4516
  89. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  90. GRB 080825B: pseudo-z= 0.83 from prompt emission spectrum
  91. Konus-Wind observation of GRB 080825B
  92. GRB 080825B: Swift-XRT team analysis
  93. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  94. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  95. GRB080825: Afterglow confirmation and redshift estimate
  96. Suzaku ToO Observation of SGR 0501+4516
  97. GRB 080825B - optical counterpart candidate
  98. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  99. Konus-Wind observations of new SGR 0501+4516
  100. Radio Detection of SGR 0501+4516

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