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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"

26664 results found.

  1. GRB 090309, Swift-BAT refined analysis
  2. GRB 090308: GROND observations
  3. GRB 090308: Gemini GMOS Observations
  4. GRB 090309: Swift detection of a burst
  5. GRB 090308B: Fermi GBM detection
  6. GRB 090308: Swift/UVOT Upper Limits
  7. GRB 090307B: Fermi GBM detection
  8. GRB 090306C: Fermi GBM detection
  9. GRB 090307: GROND Upper Limits
  10. GRB 090306B: GROND Upper Limits
  11. GRB 090305C: Suzaku WAM observation of the prompt emission
  12. GRB 090308: Swift-XRT refined analysis
  13. GRB 090308: Swift detection of a burst
  14. GRB 090306B: Possible XRT afterglow
  15. GRB 090307: Swift-XRT afterglow confirmation and analysis
  16. GRB 090306B: Burst detection from Swift-BAT slew data
  17. Swift Trigger 345551 is probably not a GRB
  18. IPN localization of short GRB 090305C
  19. GRB 090306: Swift detection of a possible burst
  20. GRB 090305: Swift/UVOT Upper Limits
  21. GRB 090305: Swift-XRT refined analysis
  22. GRB 090227A: Suzaku WAM observation of the prompt emission
  23. GRB090305: GMOS-S Candidate Optical Afterglow
  24. GRB 090305: Swift detection of a short burst
  25. GRB 090303: Fermi GBM detection
  26. GRB 090304: Fermi GBM detection
  27. GRB 090301A: Suzaku WAM observation of the prompt emission
  28. GRB 090228B: Fermi GBM detection
  29. Konus-Wind observation of bright short GRB 090227B
  30. GRB 090301B: Fermi GBM detection
  31. GRB 090227B: Fermi GBM detection
  32. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  33. GRB 090228: Fermi GBM detection
  34. GRB 090227: Fermi GBM detection
  35. GRB 090206: Fermi GBM detection
  36. SGR J1550-5418
  37. GRB 081211B: Nearby cluster
  38. GRB 090222: Fermi GBM detection
  39. GRB 090219: Fermi GBM detection
  40. GRB 090217: Suzaku WAM observation of the prompt emission
  41. GRB090217: XRT analysis
  42. Konus-Wind observation of GRB 090217
  43. GRB 090213: Fermi GBM detection
  44. GRB 090217: Fermi GBM detection
  45. SGR activity seen by BAT during ICSP Ionospheric Events
  46. GRB 090207 - Fermi GBM Observations
  47. GRB 090129: Fermi GBM detection
  48. VLA radio upper limit on GRB 090205
  49. GRB 090205: Swift/UVOT Upper Limits
  50. GRB 090205: Swift-XRT refined analysis
  51. GRB 090205: GROND observations and photometric redshift estimate
  52. GRB 090205: VLT candidate afterglow
  53. GRB 090205: Enhanced Swift-XRT position
  54. GRB 090205: Swift detection of a burst
  55. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  56. GRB 090131: Suzaku WAM observation of the prompt emission
  57. Konus-Wind observation of GRB 090201
  58. GRB 090202: Fermi GBM detection
  59. GRB 090131: Fermi GBM detection
  60. GRB 090201: Swift-XRT refined analysis
  61. GRB090201: Swift UVOT upper limits
  62. GRB 090201: object inside the enhanced XRT error circle
  63. GRB 090201: Enhanced Swift-XRT position
  64. GRB 090201: VLT NIR observations
  65. GRB 090201: VLT afterglow candidate
  66. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  67. GRB090113: MAGIC telescope GeV observation
  68. GRB 090201: ROTSE-III Optical Limits
  69. GRB 090126A: Swift/UVOT Upper Limits
  70. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  71. Suzaku ToO Observation of AXP 1E 1547.0-5408
  72. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  73. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  74. GRB 090102: HST observations and host galaxy
  75. GRB 090126C: Fermi GBM detection
  76. GRB 090126A: Swift-XRT Refined Analysis
  77. GRB 090126B: Fermi GBM detection
  78. GRB 090126: SuperAGILE Localization of a Long GRB
  79. GRB 090118: no afterglow candidate
  80. GRB 090123: GROND detection
  81. GRB 090123: Swift XRT refined analysis
  82. GRB 090123: Swift/UVOT Observations
  83. GRB090123: Enhanced Swift-XRT position
  84. GRB 090123: Swift detection of a burst
  85. AXP 1E1547.0-5408: long bursts with INTEGRAL SPI-ACS
  86. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  87. GRB 090117C: Suzaku WAM observation of the prompt emission
  88. Trigger 340734: Swift detection of a possible short burst
  89. GRB 090118: Subaru NIR Observation
  90. GRB 090118: KPNO 4m 2nd Epoch Observations
  91. GRB 090118 (BATSS): GRT Optical Observation
  92. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  93. GRB 090118: Swift-XRT observations
  94. GRB090118 Swift/UVOT upper limits
  95. GRB 090118: GROND Upper Limits
  96. GRB 090118: Possible burst detection from Swift-BAT slew data
  97. GRB 090117B : Fermi GBM detection
  98. GRB 090117C - Fermi GRB Detection
  99. GRB 090117 - Fermi GBM Observations
  100. GRB 090117: GROND Upper Limits

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