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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"

32688 results found.

  1. GRB 090313 optical observations
  2. GRB 090313: Ongoing plateau phase
  3. GRB 090313: Swift-XRT refined analysis
  4. GRB 090313: Swift/UVOT upper limits
  5. GRB 090313: Faulkes Telescope North observations
  6. GRB 090313: Sustained optical brightness (correction)
  7. GRB 090306B: Confirmation of the X-ray afterglow
  8. GRB 090313: Swift-BAT refined analysis
  9. GRB 090313: Sustained optical brightness
  10. GRB 090313: SDSS object underlying the optical afterglow position
  11. GRB 090313, GROND observations
  12. GRB 090309, Swift-BAT lag analysis
  13. GRB 090205: Zadko Telescope late-time observations
  14. GRB 090309A: GROND upper limits
  15. GRB 090309: Swift/UVOT Upper Limits
  16. GRB 090309: Swift-XRT refined analysis
  17. GRB 090306B: INTEGRAL SPI-ACS light curve
  18. GRB 090309, Swift-BAT refined analysis
  19. GRB 090308: GROND observations
  20. GRB 090308: Gemini GMOS Observations
  21. GRB 090308: Swift/UVOT Upper Limits
  22. GRB 090307: GROND Upper Limits
  23. GRB 090306B: GROND Upper Limits
  24. GRB 090305C: Suzaku WAM observation of the prompt emission
  25. GRB 090308: Swift-XRT refined analysis
  26. Radio observation of GRB 090201 with ATCA
  27. Radio observation of GRB 090117 with ATCA
  28. Radio observation of GRB 081226b with ATCA
  29. Radio observation of GRB 081226a with ATCA
  30. Radio observation of GRB 081007 with ATCA
  31. ATCA observation of SGR J1550-5418
  32. GRB 090308: Swift-BAT refined analysis
  33. GRB 090306B: Possible XRT afterglow
  34. GRB 090307: Swift-XRT afterglow confirmation and analysis
  35. GRB 090307: Swift-BAT refined analysis of trigger 345551
  36. Swift Trigger 345551 is probably not a GRB
  37. GRB 090305: Swift/UVOT Upper Limits
  38. GRB 090305: Swift-XRT refined analysis
  39. GRB 090305, Swift-BAT refined analysis
  40. GRB 090227A: Suzaku WAM observation of the prompt emission
  41. GRB 090305: Magellan confirmation of the optical afterglow
  42. GRB090305: GMOS-S Candidate Optical Afterglow
  43. GRB 090301A: Suzaku WAM observation of the prompt emission
  44. Konus-RF catches first GRB and SGR bursts
  45. Konus-Wind observation of bright short GRB 090227B
  46. IPN localization of short bright GRB 090227B
  47. Konus-Wind observation of GRB 090301A
  48. GRB 090301A: Swift-BAT refined analysis
  49. SGR J1550-5418
  50. GRB 081211B: Nearby cluster
  51. GRB 090217: Suzaku WAM observation of the prompt emission
  52. GRB090217: XRT analysis
  53. Konus-Wind observation of GRB 090217
  54. IPN localization of GRB 090217
  55. GRB090217: Fermi-LAT Detection
  56. SGR activity seen by BAT during ICSP Ionospheric Events
  57. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  58. VLA radio upper limit on GRB 090205
  59. GRB 090205: VLT optical decay
  60. GRB 090205: Swift/UVOT Upper Limits
  61. GRB 090205: VLT refined redshift
  62. GRB 090205: Swift-XRT refined analysis
  63. GRB 090205: VLT spectroscopic redshift
  64. GRB 090205: GROND observations and photometric redshift estimate
  65. GRB 090205: VLT candidate afterglow
  66. GRB 090205: Swift-BAT refined analysis
  67. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  68. GRB 090131: Suzaku WAM observation of the prompt emission
  69. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  70. GRB 090126A: Swift-XRT afterglow confirmation
  71. Konus-Wind observation of GRB 090201
  72. GRB 090201: Swift-XRT refined analysis
  73. GRB090201: Swift UVOT upper limits
  74. GRB 090201: object inside the enhanced XRT error circle
  75. GRB 090201: VLT NIR observations
  76. GRB 090201: Swift-BAT refined analysis
  77. GRB 090201: VLT afterglow candidate
  78. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  79. GRB090113: MAGIC telescope GeV observation
  80. GRB 090201: ROTSE-III Optical Limits
  81. GRB 090126A: Swift/UVOT Upper Limits
  82. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  83. GRB 090129: Swift-BAT refined analysis
  84. Suzaku ToO Observation of AXP 1E 1547.0-5408
  85. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  86. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  87. GRB 090102: HST observations and host galaxy
  88. GRB 090126A: Swift-XRT Refined Analysis
  89. GRB 090118: no afterglow candidate
  90. GRB 090123: GROND detection
  91. 1E1547.0-5408: Swift detection of dust halo
  92. GRB 090123: Swift XRT refined analysis
  93. GRB 090123: Swift/UVOT Observations
  94. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  95. GRB 090123: Swift-BAT refined analysis
  96. AXP 1E1547.0-5408: long bursts with INTEGRAL SPI-ACS
  97. GRB 090118: Swift XRT Observations - Confirmation of an Afterglow
  98. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  99. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  100. AXP 1E1547.0-5408: Fermi GBM observations

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