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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"

32757 results found.

  1. GRB 090401B: VLA radio upper limit
  2. GRB 090401B: Upper limits of MITSuME optical observation
  3. GRB090401B, RIMOTS optical upper limits
  4. GRB 090401B: NOT optical observations
  5. GRB 090328: Fermi-LAT refined analysis
  6. Swift/UVOT observations of GRB090401B
  7. GRB 090401B: AGILE refined analysis
  8. Swift/UVOT observations of GRB090401B
  9. GRB 090401B: Swift XRT Refined Analysis
  10. Konus-Wind observation of GRB 090401A
  11. AGILE Gamma-ray detection of GRB 090401B
  12. GRB 090401B: Swift-BAT refined analysis
  13. Swift/UVOT detection of GRB090401B
  14. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  15. GRB 090401, Swift-BAT refined analysis
  16. GRB 090323: Further TLS detections - a break?
  17. GRB 090324: Suzaku WAM observation of the prompt emission
  18. GRB 090328: Radio afterglow detection
  19. GRB 090328: BOOTES-3 optical observations
  20. GRB 090328: Fermi GBM Spectral Analysis
  21. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  22. GRB 090328: Gemini South Redshift
  23. GRB 090328: Swift XRT refined analysis
  24. GRB090323: Optical observations from NOT
  25. Konus-Wind observation of GRB 090328
  26. GRB 090328: IPN Triangulation
  27. GRB 090328: Swift UVOT observations
  28. GRB 090323: WSRT Radio Detection
  29. GRB 090328: Possible Swift/XRT detection
  30. GRB 090323: Radio afterglow detection
  31. GRB 090323: Additional Lick observations
  32. GRB 090323: TLS detection at 5 days, no break
  33. GRB 090323: Faulkes Telescope South Observations
  34. GRB 090320B: MASTER-Net prompt optical observations
  35. GRB 090323: RTT150 optical observations
  36. GRB 090323: Lick observations
  37. GRB 090323: Fermi GBM Spectral Analysis
  38. GRB 090323: Optical observation of xinglong TNT
  39. GRB 090323 TLS detection - still bright
  40. GRB 090323: UVOT Detection of Afterglow
  41. GRB 090323: Swift-XRT refined analysis
  42. Konus-Wind observation of GRB 090323
  43. GRB 090323 Gemini-South Redshift
  44. GRB 090323: P60 Afterglow Confirmation
  45. GRB 090323: GROND Detection of the Afterglow and Photo-z
  46. SGR J1550-5418: two Fermi GBM triggers on March 22
  47. GRB 090323: Possible XRT Counterpart
  48. IPN triangulation of GRB090323
  49. Further 15GHz observations of GRB090313
  50. GRB 090313: WSRT Radio Detection
  51. X-shooter observations of GRB 090313
  52. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  53. GRB 090315: Suzaku WAM observation of the prompt emission
  54. GRB 090313: VLT spectroscopy
  55. GRB090313: radio detection with the VLA
  56. Konus-Wind observation of GRB 090315
  57. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  58. GRB 090313, SMARTS optical/IR observations
  59. Further Swift/UVOT observations of GRB 090313
  60. GRB 090313: detection with CARMA in 3mm band
  61. GRB090305B: MASTER-net prompt optical short burst observations
  62. Radio detection of GRB090313
  63. GRB 090313: MITSuME Okayama observation
  64. GRB 090313: Additional Gemini-S photometry
  65. GRB 090313: WSRT Radio Observations
  66. GRB 090313: Gemini-S photometry
  67. GRB 090313: Zadko Telescope observations
  68. GRB 090313 - PAIRITEL NIR detections
  69. GRB 090313: Gemini-S redshift
  70. GRB 090313 optical observations
  71. GRB 090313: Ongoing plateau phase
  72. GRB 090313: Swift-XRT refined analysis
  73. GRB 090313: Swift/UVOT upper limits
  74. GRB 090313: Faulkes Telescope North observations
  75. GRB 090313: Sustained optical brightness (correction)
  76. GRB 090306B: Confirmation of the X-ray afterglow
  77. GRB 090313: Swift-BAT refined analysis
  78. GRB 090313: Sustained optical brightness
  79. GRB 090313: SDSS object underlying the optical afterglow position
  80. GRB 090313, GROND observations
  81. GRB 090309, Swift-BAT lag analysis
  82. GRB 090205: Zadko Telescope late-time observations
  83. GRB 090309A: GROND upper limits
  84. GRB 090309: Swift/UVOT Upper Limits
  85. GRB 090309: Swift-XRT refined analysis
  86. GRB 090306B: INTEGRAL SPI-ACS light curve
  87. GRB 090309, Swift-BAT refined analysis
  88. GRB 090308: GROND observations
  89. GRB 090308: Gemini GMOS Observations
  90. GRB 090308: Swift/UVOT Upper Limits
  91. GRB 090307: GROND Upper Limits
  92. GRB 090306B: GROND Upper Limits
  93. GRB 090305C: Suzaku WAM observation of the prompt emission
  94. GRB 090308: Swift-XRT refined analysis
  95. Radio observation of GRB 090201 with ATCA
  96. Radio observation of GRB 090117 with ATCA
  97. Radio observation of GRB 081226b with ATCA
  98. Radio observation of GRB 081226a with ATCA
  99. Radio observation of GRB 081007 with ATCA
  100. ATCA observation of SGR J1550-5418

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