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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"
  1. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  2. Swift-BAT trigger 322590 is not a GRB
  3. VLA non-detection of SGR 0501+4516
  4. Radio Detection of SGR 0501+4516: Retraction
  5. Swift trigger 322590: BAT detection of a possible burst
  6. SGR 0501+4516: XMM-Newton monitoring schedule
  7. GRB 080828: SuperAGILE GRB Localization
  8. SGR 0501+4516: Decline in Activity
  9. SGR 0501+4516: Proximity to supernova remnant HB9
  10. Enhanced Swift-XRT position of SGR 0501+4516
  11. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  12. SGR 0501+4516: Swift XRT measure of the spin period
  13. GRB080823: Fermi Gamma-ray Burst Monitor detection
  14. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  15. GRB 080825B: pseudo-z= 0.83 from prompt emission spectrum
  16. Konus-Wind observation of GRB 080825B
  17. GRB080825C: GLAST Burst Monitor detection
  18. GRB 080825B: Swift-XRT team analysis
  19. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  20. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  21. GRB080825: Afterglow confirmation and redshift estimate
  22. Suzaku ToO Observation of SGR 0501+4516
  23. GRB 080825B - optical counterpart candidate
  24. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  25. GRB 080825B: GRB Localization by SuperAGILE
  26. Konus-Wind observations of new SGR 0501+4516
  27. INTEGRAL ToO Observation of SGR0501+4516
  28. Radio Detection of SGR 0501+4516
  29. SGR 0501+4516: MDM Optical Observations
  30. GRB 080822B, Swift-BAT refined analysis
  31. SGR 0501+4516: Astrotel-Caucasus optical observations
  32. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  33. SGR 0501+4516: WSRT Radio Observations
  34. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  35. GRB 080822B: MASTER optical observation
  36. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  37. SGR 0501+4516: optical observations
  38. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  39. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  40. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  41. GRB 080822B: Swift detection of a burst
  42. GRB080818B: GLAST Burst Monitor detection
  43. Third event from SGR 0501+4516
  44. GRB 080822 (SGR 0501+4516): archival optical observations
  45. New Soft Gamma Repeater 0501+4516 was GRB 080822
  46. GRB 080822: Swift detection of a short burst
  47. GLAST Burst Monitor detection of a GRB: 080816B
  48. GLAST Burst Monitor detection of GRB 080818
  49. GLAST Burst Monitor detection of GRB080817B
  50. GLAST Burst Monitor detection of GRB 080817
  51. GLAST Burst Monitor detection of GRB080816
  52. GRB080810 - optical observations
  53. GRB080810: optical observations
  54. GLAST Burst Monitor detection of GRB 080812
  55. Radio detection of GRB 080810 with the VLA
  56. GRB 080810: RTT150 optical observations
  57. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  58. GLAST Burst Monitor detection of GRB 080810
  59. GRB 080810: Liverpool and Faulkes North observations
  60. GRB 080810: RTT150 optical observations
  61. GRB080810: MITSuME optical observation
  62. First GLAST Burst Monitor GRB Circulars
  63. GRB 080810: Swift/UVOT Refined Analysis
  64. GRB 080810: optical observations
  65. GRB 080810: Liverpool Telescope observations
  66. GRB 080810: D50 optical observation
  67. GRB 080810: Kanazawa optical observation
  68. GRB 080810: OSN follow-up
  69. GRB 080810: Observations from NOT
  70. GRB 080810: RTT150 optical observations
  71. GRB 080810: Swift-XRT Team refined analysis
  72. GRB 080810: Enhanced Swift-XRT position
  73. GRB 080810: KANATA optical-NIR observation, update
  74. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  75. GRB 080810: Keck/HIRES Spectroscopy
  76. GRB 080810, Swift-BAT refined analysis
  77. GRB 080810 : optical observation with KANATA
  78. GRB 080810: Swift detection of a burst with a bright optical afterglow
  79. GRB 080723B: GROND upper limits
  80. GRB 080723B: XMM-Newton observation
  81. GRB 080805: VLT redshift update
  82. GRB 080805: Faulkes Telescope South optical observations
  83. GRB 080804: GROND observations
  84. GRB 080727B: Late VLT imaging
  85. GRB 080804: ATCA Radio Observations
  86. GRB 080805: Swift-XRT Refined Analysis
  87. GRB 080805: Swift/UVOT Upper Limits
  88. GRB 080804: Swift-XRT Refined Analysis
  89. GRB 080804: Swift/UVOT Refined Analysis
  90. GRB 080805, Swift-BAT refined analysis
  91. GRB 080804, Swift-BAT refined analysis
  92. GRB 080804: Enhanced Swift-XRT position
  93. GRB080804: Gemini South redshift confirmation
  94. GRB 080804: Faulkes Telescope South observations
  95. GRB080805 optical limit by "Pi of the Sky"
  96. GRB 080805: VLT redshift
  97. GRB 080805: Afterglow confirmation
  98. GRB 080805: GROND detection of possible afterglow
  99. GRB 080805: Swift detection of a burst
  100. GRB 080804: UVES redshift

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