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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"

37730 results found.

  1. GRB 090305: Magellan confirmation of the optical afterglow
  2. GRB090305: GMOS-S Candidate Optical Afterglow
  3. GRB 090305: Swift detection of a short burst
  4. GRB 090303: Fermi GBM detection
  5. GRB 090304: Fermi GBM detection
  6. GRB 090301A: Suzaku WAM observation of the prompt emission
  7. Konus-RF catches first GRB and SGR bursts
  8. GRB 090228B: Fermi GBM detection
  9. Konus-Wind observation of bright short GRB 090227B
  10. IPN localization of short bright GRB 090227B
  11. Konus-Wind observation of GRB 090301A
  12. GRB 090301A: Swift-BAT refined analysis
  13. GRB 090301B: Fermi GBM detection
  14. GRB 090227B: Fermi GBM detection
  15. GRB 090301: Swift detection of a burst
  16. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  17. GRB 090228: Fermi GBM detection
  18. GRB 090227: Fermi GBM detection
  19. GRB 090206: Fermi GBM detection
  20. SGR J1550-5418
  21. GRB 081211B: Nearby cluster
  22. Ongoing activity of AXP/SGR 1E1547.0-5408
  23. GRB 090222: Fermi GBM detection
  24. GRB 090219: Fermi GBM detection
  25. Swift Trigger 343319 is not a GRB
  26. GRB 090217: Suzaku WAM observation of the prompt emission
  27. GRB090217: XRT analysis
  28. Konus-Wind observation of GRB 090217
  29. IPN localization of GRB 090217
  30. GRB 090213: Fermi GBM detection
  31. GRB090217: Fermi-LAT Detection
  32. GRB 090217: Fermi GBM detection
  33. SGR activity seen by BAT during ICSP Ionospheric Events
  34. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  35. GRB 090207 - Fermi GBM Observations
  36. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  37. GRB 090129: Fermi GBM detection
  38. VLA radio upper limit on GRB 090205
  39. GRB 090205: VLT optical decay
  40. Fermi Gamma-ray Burst Monitor trigger 255541748 cannot be classified
  41. GRB 090205: Swift/UVOT Upper Limits
  42. GRB 090205: VLT refined redshift
  43. GRB 090205: Swift-XRT refined analysis
  44. GRB 090205: Swift burst of interest
  45. GRB 090205: VLT spectroscopic redshift
  46. GRB 090205: GROND observations and photometric redshift estimate
  47. GRB 090205: VLT candidate afterglow
  48. GRB 090205: Swift-BAT refined analysis
  49. GRB 090205: Enhanced Swift-XRT position
  50. GRB 090205: Swift detection of a burst
  51. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  52. GRB 090131: Suzaku WAM observation of the prompt emission
  53. GRB 090126A: Swift-XRT afterglow confirmation
  54. Fermi Gamma-ray Burst Monitor trigger 255342766 is not a GRB
  55. Konus-Wind observation of GRB 090201
  56. GRB 090202: Fermi GBM detection
  57. GRB 090131: Fermi GBM detection
  58. GRB 090201: Swift-XRT refined analysis
  59. GRB090201: Swift UVOT upper limits
  60. GRB 090201: object inside the enhanced XRT error circle
  61. GRB 090201: Enhanced Swift-XRT position
  62. GRB 090201: VLT NIR observations
  63. GRB 090201: Swift-BAT refined analysis
  64. GRB 090201: VLT afterglow candidate
  65. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  66. GRB090113: MAGIC telescope GeV observation
  67. GRB 090201: ROTSE-III Optical Limits
  68. GRB 090201: Swift detection of a burst
  69. GRB 090126A: Swift/UVOT Upper Limits
  70. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  71. GRB 090129: Swift-BAT refined analysis
  72. GRB 090129: Swift detection of a burst
  73. IBAS Alert N. 5442 is not a GRB
  74. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  75. GRB 090102: HST observations and host galaxy
  76. GRB 090126C: Fermi GBM detection
  77. GRB 090126A: Swift-XRT Refined Analysis
  78. GRB 090126B: Fermi GBM detection
  79. GRB 090126: SuperAGILE Localization of a Long GRB
  80. GRB 090118: no afterglow candidate
  81. GRB 090123: GROND detection
  82. GRB 090123: Swift XRT refined analysis
  83. GRB 090123: Swift/UVOT Observations
  84. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  85. GRB 090123: Swift-BAT refined analysis
  86. GRB 090123: Swift detection of a burst
  87. AXP 1E1547.0-5408: long bursts with INTEGRAL SPI-ACS
  88. GRB 090118: Swift XRT Observations - Confirmation of an Afterglow
  89. Swift-BAT trigger 340734 is not a GRB
  90. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  91. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  92. GRB 090117C: Suzaku WAM observation of the prompt emission
  93. AXP 1E1547.0-5408: Fermi GBM observations
  94. Trigger 340734: Swift detection of a possible short burst
  95. AXP 1E1547.0-5408 activity with SGR bursts
  96. GRB 090118: Subaru NIR Observation
  97. GRB 090118: KPNO 4m 2nd Epoch Observations
  98. GRB 090118 (BATSS): GRT Optical Observation
  99. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  100. GRB 090118: Swift-XRT observations

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