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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"

26196 results found.

  1. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  2. Suzaku ToO Observation of SGR 0501+4516
  3. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  4. GRB 080825B: GRB Localization by SuperAGILE
  5. Radio Detection of SGR 0501+4516
  6. GRB 080822B, Swift-BAT refined analysis
  7. SGR 0501+4516: Astrotel-Caucasus optical observations
  8. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  9. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  10. SGR 0501+4516: optical observations
  11. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  12. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  13. GRB080818B: GLAST Burst Monitor detection
  14. GRB 080822: Swift detection of a short burst
  15. GLAST Burst Monitor detection of a GRB: 080816B
  16. GLAST Burst Monitor detection of GRB 080818
  17. GLAST Burst Monitor detection of GRB080817B
  18. GLAST Burst Monitor detection of GRB 080817
  19. GLAST Burst Monitor detection of GRB080816
  20. GRB080810 - optical observations
  21. GLAST Burst Monitor detection of GRB 080812
  22. Radio detection of GRB 080810 with the VLA
  23. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  24. GLAST Burst Monitor detection of GRB 080810
  25. First GLAST Burst Monitor GRB Circulars
  26. GRB 080810: Swift/UVOT Refined Analysis
  27. GRB 080810: Liverpool Telescope observations
  28. GRB 080810: Kanazawa optical observation
  29. GRB 080810: OSN follow-up
  30. GRB 080810: Swift-XRT Team refined analysis
  31. GRB 080810: Enhanced Swift-XRT position
  32. GRB 080810: KANATA optical-NIR observation, update
  33. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  34. GRB 080810, Swift-BAT refined analysis
  35. GRB 080810 : optical observation with KANATA
  36. GRB 080810: Swift detection of a burst with a bright optical afterglow
  37. GRB 080723B: GROND upper limits
  38. GRB 080723B: XMM-Newton observation
  39. GRB 080805: Faulkes Telescope South optical observations
  40. GRB 080804: GROND observations
  41. GRB 080727B: Late VLT imaging
  42. GRB 080805: Swift-XRT Refined Analysis
  43. GRB 080805: Swift/UVOT Upper Limits
  44. GRB 080804: Swift-XRT Refined Analysis
  45. GRB 080804: Swift/UVOT Refined Analysis
  46. GRB 080805, Swift-BAT refined analysis
  47. GRB 080804, Swift-BAT refined analysis
  48. GRB 080804: Enhanced Swift-XRT position
  49. GRB 080804: Faulkes Telescope South observations
  50. GRB080805 optical limit by "Pi of the Sky"
  51. GRB 080805: Afterglow confirmation
  52. GRB 080805: GROND detection of possible afterglow
  53. GRB 080805: Swift detection of a burst
  54. GRB 080804: Swift detection of a burst with optical afterglow
  55. GRB 080804: ROTSE-III Detection of Optical Counterpart
  56. GRB 080802: Swift/UVOT Upper Limits
  57. GRB 080802: UVI Telescope Upper Limit
  58. GRB 080802, Swift-BAT refined analysis
  59. GRB 080802: Swift detection of a probable burst
  60. GRB 080727C: Suzaku WAM observation of the prompt emission
  61. GRB 080727B: IR photometry
  62. GRB 080727C: TAROT Calern observatory optical observations
  63. GRB 080727B: KAIT photometry and an early lightcurve break
  64. GRB 080727C, Swift-BAT refined analysis
  65. GRB 080727C: Swift/UVOT Upper Limits
  66. GRB 080727C: Swift XRT refined analysis
  67. GRB 080727C: Liverpool Telescope observations
  68. GRB 080727A: VLT upper limits
  69. GRB 080727C: Enhanced Swift-XRT position
  70. GRB080727C: RTT150 optical observations
  71. GRB 080727C: Swift detection of a burst
  72. Swift detection of XTE J1701-407
  73. GRB 080727B: Swift/UVOT Upper Limits
  74. BAT Trigger 318150 is not a GRB
  75. GRB 080727B: Swift-XRT refined analysis
  76. GRB 080727B, Swift-BAT refined analysis
  77. GRB 080727A, Swift-BAT refined analysis
  78. GRB 080727A: Swift-XRT refined analysis
  79. GRB080727A: Swift/UVOT Upper Limits
  80. GRB 080727B: Enhanced Swift-XRT position
  81. GRB 080727A: Enhanced Swift-XRT position
  82. GRB 080727B: REM prompt observations
  83. GRB 080727B: Swift detection of a bright burst
  84. GRB 080727: Swift detection of a burst
  85. GRB 080726: GRB Localization by SuperAGILE
  86. GRB 080725, Swift-BAT refined analysis
  87. GRB 080723A: optical upper limit
  88. GRB080723B: Swift/UVOT Upper Limits
  89. GRB 080725: REM prompt observations
  90. GRB 080723A: Swift/UVOT Upper Limits
  91. VLA radio upper limit on GRB 080721
  92. GRB 080723B - correction to flux conversion factor
  93. GRB 080723B - Swift-XRT refined analysis
  94. GRB 080723, Swift-BAT refined analysis
  95. GRB 080723B: AGILE GRID and MCAL results
  96. GRB 080723A: Swift-XRT refined analysis
  97. GRB 080723B: Detection and Localization by SuperAGILE
  98. GRB 080723: Enhanced Swift-XRT position
  99. GRB 080723: Swift detection of a burst
  100. GRB 080721 : Lulin 2nd optical follow-ups

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