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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"

45418 results found.

  1. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  2. GRB 080913: Swift detection of a burst
  3. GRB 080906: Watcher observations
  4. Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
  5. GRB 080906B: Fermi GBM detection
  6. GRB 080905C: Fermi GBM detection
  7. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  8. Swift trigger 324362 (LS I +61 303 ?): XRT
  9. GRB 080905B: Photometric Redshift for the 2MASS Galaxy
  10. Swift trigger 324362 (LS I +61 303 ?)
  11. GRB080905A: Swift/UVOT Upper Limits
  12. GRB 080905B: Watcher optical detection
  13. GRB 080904: Fermi Gamma-ray Burst Monitor detection
  14. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  15. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  16. GRB 080905A: Enhanced Swift-XRT position
  17. GRB 080905A: MITSuME Akeno optical upper limits
  18. Swift Trigger 324122 is again known source Swift J1842.5-1124
  19. Swift Trigger 324116 is known source again
  20. Swift Trigger 324112 is known source Swift J1842.5-1124
  21. GRB 080906: Refined Swift/UVOT Observations
  22. GRB 080906: Swift-XRT Refined Analysis
  23. GRB 080906, Swift-BAT refined analysis
  24. GRB 080905A: optical afterglow
  25. GRB 080906: GROND observations of the optical/NIR afterglow
  26. GRB 080905B: Swift-XRT Refined Analysis
  27. GRB 080905B: Refined UVOT Analysis
  28. GRB 080905B: VLT redshift
  29. GRB 080905A: NOT and VLT observations
  30. GRB 080905B: Enhanced Swift-XRT position
  31. GRB 080905B, Swift-BAT refined analysis
  32. GRB 080905A, Swift-BAT refined analysis
  33. GRB 080906: Swift detection of a burst with optical afterglow
  34. GRB 080905A: Swift-XRT Refined Analysis
  35. GRB 080825C: Fermi GBM Spectral Analysis
  36. GRB080825C: Fermi-LAT observations
  37. GRB 080905B: Swift detection of a burst with possible optical counterpart
  38. GRB 080905: R & I-band optical observations
  39. GRB 080905: Swift detection of a probably-short burst
  40. GRB 080903: Swift/UVOT Observations
  41. GRB 080903: Swift-XRT Refined Analysis
  42. GRB 080903: Enhanced Swift-XRT position
  43. GRB 080903, Swift-BAT refined analysis
  44. GRB 080903: optical observations
  45. GRB 080903: Liverpool Telescope observations
  46. GRB 080903: Astrotel-Caucasus optical observations
  47. GRB 080903: Optical afterglow candidate
  48. GRB 080903: TAROT Calern observatory optical observations
  49. GRB 080903: ROTSE-III Optical Limits
  50. GRB 080903: Swift detection of a burst
  51. Recent VLA non-detection of SGR 0501+4516
  52. GRB 080830: Fermi Gamma-ray Burst Monitor detection
  53. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  54. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  55. nIR observations of SGR 0501+4516
  56. INTEGRAL ToO observation of SGR0501+4516
  57. SGR 0501+4516: Confirmation of the NIR counterpart
  58. GRB080828: Swift/UVOT Upper Limits
  59. SGR 0501+4516: Detection of possible optical counterpart
  60. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  61. GRB080825B: Swift/UVOT Upper Limits
  62. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  63. Swift-BAT trigger 322590 is not a GRB
  64. VLA non-detection of SGR 0501+4516
  65. Radio Detection of SGR 0501+4516: Retraction
  66. Swift trigger 322590: BAT detection of a possible burst
  67. SGR 0501+4516: XMM-Newton monitoring schedule
  68. GRB 080828: SuperAGILE GRB Localization
  69. SGR 0501+4516: Decline in Activity
  70. SGR 0501+4516: Proximity to supernova remnant HB9
  71. Enhanced Swift-XRT position of SGR 0501+4516
  72. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  73. SGR 0501+4516: Swift XRT measure of the spin period
  74. GRB080823: Fermi Gamma-ray Burst Monitor detection
  75. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  76. GRB 080825B: pseudo-z= 0.83 from prompt emission spectrum
  77. Konus-Wind observation of GRB 080825B
  78. GRB080825C: GLAST Burst Monitor detection
  79. GRB 080825B: Swift-XRT team analysis
  80. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  81. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  82. GRB080825: Afterglow confirmation and redshift estimate
  83. Suzaku ToO Observation of SGR 0501+4516
  84. GRB 080825B - optical counterpart candidate
  85. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  86. GRB 080825B: GRB Localization by SuperAGILE
  87. Konus-Wind observations of new SGR 0501+4516
  88. INTEGRAL ToO Observation of SGR0501+4516
  89. Radio Detection of SGR 0501+4516
  90. SGR 0501+4516: MDM Optical Observations
  91. GRB 080822B, Swift-BAT refined analysis
  92. SGR 0501+4516: Astrotel-Caucasus optical observations
  93. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  94. SGR 0501+4516: WSRT Radio Observations
  95. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  96. GRB 080822B: MASTER optical observation
  97. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  98. SGR 0501+4516: optical observations
  99. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  100. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events

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