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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"

32693 results found.

  1. GRB 090618: RTT150 optical observations
  2. GRB 090621B: Optical Observations
  3. GRB 090621A: Swift-BAT refined analysis
  4. GRB 090621: Swift/UVOT Upper Limits
  5. GRB 090621: Swift-XRT Team refined analysis
  6. GRB090618: Spectrum and photometry from 6.0m BTA
  7. GRB 090618: BOAO V-band Observation
  8. GRB 090618: ZTSh optical observations
  9. GRB 090618 : WSRT radio detection
  10. GRB090618, underlying supernova search
  11. GRB090618: OAA-OAUV Optical observations
  12. GRB 090618: Fermi GBM observation
  13. GRB 090618, Swift-BAT refined spectral analysis
  14. VLA radio detection of GRB 090618
  15. GRB090618 - Continued optical monitoring and light curve break
  16. GRB 090618: Swift-BAT refined analysis
  17. GRB 090618: SARA observations
  18. GRB090618: Swift-XRT team refined analysis
  19. GRB090618: Swift/UVOT bright afterglow detection
  20. GRB 090618: SDSS host detection
  21. Swift XRT observations of GRB 090531A
  22. GRB 090618: AGILE observations
  23. GRB 090618: LOAO R-band Observation
  24. GRB 090618 Faulkes Telescope North observations
  25. Optical observations of GRB 090618
  26. GRB 090618: OA behavior from KAIT
  27. GRB 090618: ROTSE-III Detection of Optical Counterpart
  28. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  29. GRB 090424: WSRT Radio Observations
  30. GRB 090423: WSRT Radio Observations
  31. RXTE Discovery of Pulsations from SGR 0418+5729
  32. GRB 090531B: Fermi GBM detection
  33. Konus-RF observation of SGR burst 090605A
  34. Discovery of a new soft gamma repeater source, SGR 0418+5729
  35. GRB 090607: XRT Team Refined Analysis
  36. GRB 090607: Swift/UVOT Upper Limits
  37. GRB 090607: Swift-BAT refined analysis of the SHB
  38. GRB 090607: GRAS001 optical observations
  39. GRB 090607: Faulkes Telescope North observations
  40. Ignore GCN/Swift-BAT Lightcurve Notices for trigger 353567
  41. GRB 090530B: Suzaku WAM observation of the prompt emission
  42. GRB 090530: Further NOT optical observations
  43. GRB 090530: RTT150 Optical Observation
  44. GRB 090529A: RTT150 Optical Observations
  45. GMRT observation of GRB 090424 afterglow
  46. GRB 090528: Suzaku WAM observation of the prompt emission
  47. GRB090529: Further NOT optical observations
  48. GRB 090531b, SMARTS optical/IR observations
  49. GRB 090531B: GROND observation
  50. GRB 090530: Early RAPTOR Optical Observations
  51. GRB090529B: ROVOR Upper Limits
  52. GRB 090531A: SARA upper limit
  53. GRB 090531B: Swift/BAT spectral lag results
  54. Corrections to GRB 090531B Swift/UVOT Upper Limits
  55. GRB 090531B, RIMOTS optical upper limits
  56. GRB 090531B: Swift/UVOT Upper Limits
  57. GRB 090528B: MASTER-II Kourovka optical limit
  58. GRB 090529: MITSuME optical observation
  59. GRB 090530: GRT Optical Observation
  60. GRB 090531B: Swift-BAT refined analysis
  61. Initial Swift/UVOT observations of GRB 090531B
  62. GRB 090531B: Swift-XRT candidate afterglow position
  63. GRB 090531B: ROTSE-III Optical Limits
  64. GRB 090531: Swift-BAT refined analysis
  65. GRB090530: R-band Observation
  66. GRB 090530: break in light curve
  67. GRB 090529: VLT spectroscopic redshift
  68. GRB 090531: GROND upper limits
  69. GRB 090531: P60 Observations
  70. GRB 090529: NOT optical observations
  71. GRB 090530: NOT optical observations
  72. GRB090530: Swift XRT refined analysis
  73. GRB090530: Swift/UVOT afterglow detection
  74. GRB 090529: Swift-XRT refined analysis
  75. GRB 090529: OSN optical observations
  76. Strong radio emission from SN 2007bg one year after the explosion - detection of spreading, off-axis GRB jet?
  77. GRB 090530: Swift-BAT refined analysis
  78. GRB 090530: GRAS002 refined OA analysis
  79. GRB 090530: GRAS002 optical observations
  80. GRB 090530: PAIRITEL NIR Detections
  81. GRB 090530A: ROTSE-III Detection of Optical Counterpart
  82. GRB 090529: optical observations
  83. GRB 090529: TLS Afterglow Observations
  84. GRB090529: UVOT/Swift detection of a brightening optical afterglow
  85. GRB 090529: Swift-BAT refined analysis
  86. GRB 090529: Preliminary Swift/UVOT Upper Limit
  87. GRB 090529: Xinglong TNT optical observation
  88. GRB 090520B: Fermi GBM detection
  89. GRB 090518 - NOT upper limit
  90. GRB 090516A: Konus-Wind and Swift/BAT joint spectral analysis
  91. GRB 090520: GROND upper limits
  92. GRB 090518: Fermi GBM detection
  93. GRB 090423: Fermi GBM T90 follow-up analysis results
  94. GRB 090516: Fermi GBM observation
  95. GRB 090519: Swift-XRT refined analysis
  96. GRB 090519: NOT refined analysis
  97. GRB 090519: VLT spectroscopic redshift
  98. GRB 090519: GROND observation
  99. GRB 090519: Swift/UVOT Upper Limits
  100. GRB 090519, Swift-BAT refined analysis

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