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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"

32705 results found.

  1. GRB 090621A: GRT Optical Observation
  2. PAIRITEL observations of GRB 090618
  3. GRB 090621B: Fermi GBM detection
  4. GRB 090621B: Gemini spectrum of afterglow candidate
  5. GRB 090621B: P60 Observations
  6. GRB 090621: Fermi GBM observation
  7. GRB 090621B: VLA observations
  8. Konus-Wind and Konus-RF observations of GRB 090618
  9. GRB 090621B: Swift/UVOT Upper Limits
  10. GRB 090621B: Swift-BAT refined analysis
  11. GRB 090621B: Swift-XRT refined analysis
  12. GRB 090621B: RTT150 optical observations
  13. GRB 090618: RTT150 optical observations
  14. GRB 090621B: Optical Observations
  15. GRB 090621A: Swift-BAT refined analysis
  16. GRB 090621: Swift/UVOT Upper Limits
  17. GRB 090621: Swift-XRT Team refined analysis
  18. GRB090618: Spectrum and photometry from 6.0m BTA
  19. GRB 090618: BOAO V-band Observation
  20. GRB 090618: ZTSh optical observations
  21. GRB 090618 : WSRT radio detection
  22. GRB090618, underlying supernova search
  23. GRB090618: OAA-OAUV Optical observations
  24. GRB 090618: Fermi GBM observation
  25. GRB 090618, Swift-BAT refined spectral analysis
  26. VLA radio detection of GRB 090618
  27. GRB090618 - Continued optical monitoring and light curve break
  28. GRB 090618: Swift-BAT refined analysis
  29. GRB 090618: SARA observations
  30. GRB090618: Swift-XRT team refined analysis
  31. GRB090618: Swift/UVOT bright afterglow detection
  32. GRB 090618: SDSS host detection
  33. Swift XRT observations of GRB 090531A
  34. GRB 090618: AGILE observations
  35. GRB 090618: LOAO R-band Observation
  36. GRB 090618 Faulkes Telescope North observations
  37. Optical observations of GRB 090618
  38. GRB 090618: OA behavior from KAIT
  39. GRB 090618: ROTSE-III Detection of Optical Counterpart
  40. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  41. GRB 090424: WSRT Radio Observations
  42. GRB 090423: WSRT Radio Observations
  43. RXTE Discovery of Pulsations from SGR 0418+5729
  44. GRB 090531B: Fermi GBM detection
  45. Konus-RF observation of SGR burst 090605A
  46. Discovery of a new soft gamma repeater source, SGR 0418+5729
  47. GRB 090607: XRT Team Refined Analysis
  48. GRB 090607: Swift/UVOT Upper Limits
  49. GRB 090607: Swift-BAT refined analysis of the SHB
  50. GRB 090607: GRAS001 optical observations
  51. GRB 090607: Faulkes Telescope North observations
  52. Ignore GCN/Swift-BAT Lightcurve Notices for trigger 353567
  53. GRB 090530B: Suzaku WAM observation of the prompt emission
  54. GRB 090530: Further NOT optical observations
  55. GRB 090530: RTT150 Optical Observation
  56. GRB 090529A: RTT150 Optical Observations
  57. GMRT observation of GRB 090424 afterglow
  58. GRB 090528: Suzaku WAM observation of the prompt emission
  59. GRB090529: Further NOT optical observations
  60. GRB 090531b, SMARTS optical/IR observations
  61. GRB 090531B: GROND observation
  62. GRB 090530: Early RAPTOR Optical Observations
  63. GRB090529B: ROVOR Upper Limits
  64. GRB 090531A: SARA upper limit
  65. GRB 090531B: Swift/BAT spectral lag results
  66. Corrections to GRB 090531B Swift/UVOT Upper Limits
  67. GRB 090531B, RIMOTS optical upper limits
  68. GRB 090531B: Swift/UVOT Upper Limits
  69. GRB 090528B: MASTER-II Kourovka optical limit
  70. GRB 090529: MITSuME optical observation
  71. GRB 090530: GRT Optical Observation
  72. GRB 090531B: Swift-BAT refined analysis
  73. Initial Swift/UVOT observations of GRB 090531B
  74. GRB 090531B: Swift-XRT candidate afterglow position
  75. GRB 090531B: ROTSE-III Optical Limits
  76. GRB 090531: Swift-BAT refined analysis
  77. GRB090530: R-band Observation
  78. GRB 090530: break in light curve
  79. GRB 090529: VLT spectroscopic redshift
  80. GRB 090531: GROND upper limits
  81. GRB 090531: P60 Observations
  82. GRB 090529: NOT optical observations
  83. GRB 090530: NOT optical observations
  84. GRB090530: Swift XRT refined analysis
  85. GRB090530: Swift/UVOT afterglow detection
  86. GRB 090529: Swift-XRT refined analysis
  87. GRB 090529: OSN optical observations
  88. Strong radio emission from SN 2007bg one year after the explosion - detection of spreading, off-axis GRB jet?
  89. GRB 090530: Swift-BAT refined analysis
  90. GRB 090530: GRAS002 refined OA analysis
  91. GRB 090530: GRAS002 optical observations
  92. GRB 090530: PAIRITEL NIR Detections
  93. GRB 090530A: ROTSE-III Detection of Optical Counterpart
  94. GRB 090529: optical observations
  95. GRB 090529: TLS Afterglow Observations
  96. GRB090529: UVOT/Swift detection of a brightening optical afterglow
  97. GRB 090529: Swift-BAT refined analysis
  98. GRB 090529: Preliminary Swift/UVOT Upper Limit
  99. GRB 090529: Xinglong TNT optical observation
  100. GRB 090520B: Fermi GBM detection

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