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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"

32725 results found.

  1. GRB 080408A: GAO 150cm telescope Optical Observation
  2. GRB 090422: Liverpool Telescope observations
  3. GRB 090417B: Optical observation
  4. GRB 090418A: optical observations
  5. GRB 090418B: GROND observations
  6. GRB 090419: Swift/UVOT Observations
  7. GRB 090418B: Faulkes Telescope North observations
  8. GRB 090418A: Swift/UVOT Observations
  9. GRB 090417B: Swift/UVOT Upper Limits
  10. GRB 090417B Correction to the BAT refined analysis position
  11. GRB 090419: Swift-XRT refined analysis
  12. Konus-Wind observation of GRB 090418B
  13. GRB 090418: Erratum in GCN 9168
  14. GRB 090419: GROND detection of afterglow candidate
  15. GRB 090418: Optical observations with MITSuME Okayama and Ishigaki 1m telescope
  16. GRB 090419: Swift-BAT refined analysis
  17. VLA radio detection of GRB 090418
  18. VLA radio upper limit on GRB 090417B
  19. GRB 090418: Swift XRT refined analysis
  20. GRB 090418A: ROTSE-III Refined Analysis
  21. VLA observations of short burst GRB 090417A
  22. GRB 090417B: Gemini imaging
  23. GRB 090418: Swift-BAT refined analysis
  24. GRB 090417B: Galaxy redshift
  25. GRB 090417B: Swift-XRT refined analysis
  26. GRB 090417B: Swift-BAT further refined analysis
  27. GRB 090418: PAIRITEL NIR detection
  28. GRB 090418 Lick Redshift
  29. GRB 090418: ROTSE-III Confirmation of Optical Counterpart
  30. GRB 090411B: Suzaku WAM observation of the prompt emission
  31. GRB 090411A: Suzaku WAM observation of the prompt emission
  32. GRB 090417B: Subaru NIR Observations
  33. GRB 090417B: Liverpool Telescope observations
  34. GRB 090417B: MITSuME Okayama optical upper limits
  35. GRB090417B: Xinglong TNT optical upper limit
  36. GRB 090417B: optical observations
  37. GRB090417B: optical observations
  38. GRB 090417B: Swift-BAT refined analysis
  39. GRB 090417A: Swift-BAT refined analysis
  40. GRB 090417A: Early-type nature of the putative host
  41. GRB 090417A: nearby galaxy redshift
  42. GRB 090417: 2MASS galaxy within BAT Localization
  43. GRB 090410: Suzaku WAM observation of the prompt emission
  44. GRB 090410: GROND upper limits
  45. GRB 090410: MITSuME optical upper limits
  46. GRB 090408b: IPN Triangulation
  47. GRB 090328b: IPN Triangulation
  48. GRB 090410: Swift-BAT refined analysis
  49. GRB090408, RIMOTS optical upper limits
  50. GRB 090408: Xinglong TNT optical Upper Limit
  51. GRB 090408B: MASTER II-Kourovka optical observations
  52. GRB 090407: GROND upper limits
  53. GRB 090407: VLT observations
  54. GRB 090407: Swift-XRT refined analysis
  55. GRB 090407: Swift UVOT Upper Limits
  56. GRB 090407: Swift-BAT refined analysis
  57. GRB 090407: ROTSE-III Optical Limits
  58. GRB 090404: GROND upper limits
  59. GRB 090404: further NOT observations
  60. Swift/UVOT observations of GRB090404
  61. GRB 090404: NOT observations
  62. GRB 090404: Swift-XRT Team refined analysis
  63. GRB 090404: Xinglong TNT optical Upper Limit
  64. GRB 090404: Swift-BAT refined analysis
  65. GRB 090401A: Suzaku WAM observation of the prompt emission
  66. GRB 090401B: Suzaku WAM observation of the prompt emission
  67. Konus-Wind observation of GRB 090401B
  68. GRB 090401B: Xinglong TNT optical Upper Limit
  69. GRB 090401B: VLA radio upper limit
  70. GRB 090401B: Upper limits of MITSuME optical observation
  71. GRB090401B, RIMOTS optical upper limits
  72. GRB 090401B: NOT optical observations
  73. GRB 090328: Fermi-LAT refined analysis
  74. Swift/UVOT observations of GRB090401B
  75. GRB 090401B: AGILE refined analysis
  76. Swift/UVOT observations of GRB090401B
  77. GRB 090401B: Swift XRT Refined Analysis
  78. Konus-Wind observation of GRB 090401A
  79. AGILE Gamma-ray detection of GRB 090401B
  80. GRB 090401B: Swift-BAT refined analysis
  81. Swift/UVOT detection of GRB090401B
  82. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  83. GRB 090401, Swift-BAT refined analysis
  84. GRB 090323: Further TLS detections - a break?
  85. GRB 090324: Suzaku WAM observation of the prompt emission
  86. GRB 090328: Radio afterglow detection
  87. GRB 090328: BOOTES-3 optical observations
  88. GRB 090328: Fermi GBM Spectral Analysis
  89. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  90. GRB 090328: Gemini South Redshift
  91. GRB 090328: Swift XRT refined analysis
  92. GRB090323: Optical observations from NOT
  93. Konus-Wind observation of GRB 090328
  94. GRB 090328: IPN Triangulation
  95. GRB 090328: Swift UVOT observations
  96. GRB 090323: WSRT Radio Detection
  97. GRB 090328: Possible Swift/XRT detection
  98. GRB 090323: Radio afterglow detection
  99. GRB 090323: Additional Lick observations
  100. GRB 090323: TLS detection at 5 days, no break

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