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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"

28113 results found.

  1. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  2. nIR observations of SGR 0501+4516
  3. SGR 0501+4516: Confirmation of the NIR counterpart
  4. GRB080828: Swift/UVOT Upper Limits
  5. SGR 0501+4516: Detection of possible optical counterpart
  6. GRB080825B: Swift/UVOT Upper Limits
  7. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  8. VLA non-detection of SGR 0501+4516
  9. Swift trigger 322590: BAT detection of a possible burst
  10. GRB 080828: SuperAGILE GRB Localization
  11. Enhanced Swift-XRT position of SGR 0501+4516
  12. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  13. GRB080823: Fermi Gamma-ray Burst Monitor detection
  14. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  15. Konus-Wind observation of GRB 080825B
  16. GRB080825C: GLAST Burst Monitor detection
  17. GRB 080825B: Swift-XRT team analysis
  18. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  19. Suzaku ToO Observation of SGR 0501+4516
  20. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  21. GRB 080825B: GRB Localization by SuperAGILE
  22. Radio Detection of SGR 0501+4516
  23. GRB 080822B, Swift-BAT refined analysis
  24. SGR 0501+4516: Astrotel-Caucasus optical observations
  25. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  26. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  27. SGR 0501+4516: optical observations
  28. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  29. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  30. GRB080818B: GLAST Burst Monitor detection
  31. GRB 080822: Swift detection of a short burst
  32. GLAST Burst Monitor detection of a GRB: 080816B
  33. GLAST Burst Monitor detection of GRB 080818
  34. GLAST Burst Monitor detection of GRB080817B
  35. GLAST Burst Monitor detection of GRB 080817
  36. GLAST Burst Monitor detection of GRB080816
  37. GRB080810 - optical observations
  38. GLAST Burst Monitor detection of GRB 080812
  39. Radio detection of GRB 080810 with the VLA
  40. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  41. GLAST Burst Monitor detection of GRB 080810
  42. First GLAST Burst Monitor GRB Circulars
  43. GRB 080810: Swift/UVOT Refined Analysis
  44. GRB 080810: Liverpool Telescope observations
  45. GRB 080810: Kanazawa optical observation
  46. GRB 080810: OSN follow-up
  47. GRB 080810: Swift-XRT Team refined analysis
  48. GRB 080810: Enhanced Swift-XRT position
  49. GRB 080810: KANATA optical-NIR observation, update
  50. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  51. GRB 080810, Swift-BAT refined analysis
  52. GRB 080810 : optical observation with KANATA
  53. GRB 080810: Swift detection of a burst with a bright optical afterglow
  54. GRB 080723B: GROND upper limits
  55. GRB 080723B: XMM-Newton observation
  56. GRB 080805: Faulkes Telescope South optical observations
  57. GRB 080804: GROND observations
  58. GRB 080727B: Late VLT imaging
  59. GRB 080805: Swift-XRT Refined Analysis
  60. GRB 080805: Swift/UVOT Upper Limits
  61. GRB 080804: Swift-XRT Refined Analysis
  62. GRB 080804: Swift/UVOT Refined Analysis
  63. GRB 080805, Swift-BAT refined analysis
  64. GRB 080804, Swift-BAT refined analysis
  65. GRB 080804: Enhanced Swift-XRT position
  66. GRB 080804: Faulkes Telescope South observations
  67. GRB080805 optical limit by "Pi of the Sky"
  68. GRB 080805: Afterglow confirmation
  69. GRB 080805: GROND detection of possible afterglow
  70. GRB 080805: Swift detection of a burst
  71. GRB 080804: Swift detection of a burst with optical afterglow
  72. GRB 080804: ROTSE-III Detection of Optical Counterpart
  73. GRB 080802: Swift/UVOT Upper Limits
  74. GRB 080802: UVI Telescope Upper Limit
  75. GRB 080802, Swift-BAT refined analysis
  76. GRB 080802: Swift detection of a probable burst
  77. GRB 080727C: Suzaku WAM observation of the prompt emission
  78. GRB 080727B: IR photometry
  79. GRB 080727C: TAROT Calern observatory optical observations
  80. GRB 080727B: KAIT photometry and an early lightcurve break
  81. GRB 080727C, Swift-BAT refined analysis
  82. GRB 080727C: Swift/UVOT Upper Limits
  83. GRB 080727C: Swift XRT refined analysis
  84. GRB 080727C: Liverpool Telescope observations
  85. GRB 080727A: VLT upper limits
  86. GRB 080727C: Enhanced Swift-XRT position
  87. GRB080727C: RTT150 optical observations
  88. GRB 080727C: Swift detection of a burst
  89. Swift detection of XTE J1701-407
  90. GRB 080727B: Swift/UVOT Upper Limits
  91. BAT Trigger 318150 is not a GRB
  92. GRB 080727B: Swift-XRT refined analysis
  93. GRB 080727B, Swift-BAT refined analysis
  94. GRB 080727A, Swift-BAT refined analysis
  95. GRB 080727A: Swift-XRT refined analysis
  96. GRB080727A: Swift/UVOT Upper Limits
  97. GRB 080727B: Enhanced Swift-XRT position
  98. GRB 080727A: Enhanced Swift-XRT position
  99. GRB 080727B: REM prompt observations
  100. GRB 080727B: Swift detection of a bright burst

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