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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"

32723 results found.

  1. GRB 090628: GROND upper limits
  2. GRB 090628: 1.23m CAHA optical observations
  3. GRB 090626: IPN localization
  4. GRB 090628: Swift XRT position
  5. GRB 090628: Swift detection of a burst
  6. Fermi LAT observations of GRB 090626
  7. GRB 090625B: Fermi GBM observation
  8. GRB 090423: Spitzer observations of the z~8.3 burst
  9. GRB 090625B: Swift/UVOT Upper Limits
  10. GRB 090625B: Swift-XRT refined analysis
  11. GRB 090625B: GROND upper limits
  12. GRB 090623: Suzaku WAM observation of the prompt emission
  13. GRB090618: HCT optical observations
  14. GRB 090618: SARA Second Epoch Observations
  15. GRB 090625B: Faulkes Telescope South observations
  16. GRB 090618: Correction to GCN 9568
  17. GRB 090617: Suzaku WAM observation of the prompt emission
  18. GRB 090621B: GRT Optical Observation
  19. GRB 090621A: GRT Optical Observation
  20. PAIRITEL observations of GRB 090618
  21. GRB 090621B: Fermi GBM detection
  22. GRB 090621B: Gemini spectrum of afterglow candidate
  23. GRB 090621B: P60 Observations
  24. GRB 090621: Fermi GBM observation
  25. GRB 090621B: VLA observations
  26. Konus-Wind and Konus-RF observations of GRB 090618
  27. GRB 090621B: Swift/UVOT Upper Limits
  28. GRB 090621B: Swift-BAT refined analysis
  29. GRB 090621B: Swift-XRT refined analysis
  30. GRB 090621B: RTT150 optical observations
  31. GRB 090618: RTT150 optical observations
  32. GRB 090621B: Optical Observations
  33. GRB 090621A: Swift-BAT refined analysis
  34. GRB 090621: Swift/UVOT Upper Limits
  35. GRB 090621: Swift-XRT Team refined analysis
  36. GRB090618: Spectrum and photometry from 6.0m BTA
  37. GRB 090618: BOAO V-band Observation
  38. GRB 090618: ZTSh optical observations
  39. GRB 090618 : WSRT radio detection
  40. GRB090618, underlying supernova search
  41. GRB090618: OAA-OAUV Optical observations
  42. GRB 090618: Fermi GBM observation
  43. GRB 090618, Swift-BAT refined spectral analysis
  44. VLA radio detection of GRB 090618
  45. GRB090618 - Continued optical monitoring and light curve break
  46. GRB 090618: Swift-BAT refined analysis
  47. GRB 090618: SARA observations
  48. GRB090618: Swift-XRT team refined analysis
  49. GRB090618: Swift/UVOT bright afterglow detection
  50. GRB 090618: SDSS host detection
  51. Swift XRT observations of GRB 090531A
  52. GRB 090618: AGILE observations
  53. GRB 090618: LOAO R-band Observation
  54. GRB 090618 Faulkes Telescope North observations
  55. Optical observations of GRB 090618
  56. GRB 090618: OA behavior from KAIT
  57. GRB 090618: ROTSE-III Detection of Optical Counterpart
  58. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  59. GRB 090424: WSRT Radio Observations
  60. GRB 090423: WSRT Radio Observations
  61. RXTE Discovery of Pulsations from SGR 0418+5729
  62. GRB 090531B: Fermi GBM detection
  63. Konus-RF observation of SGR burst 090605A
  64. Discovery of a new soft gamma repeater source, SGR 0418+5729
  65. GRB 090607: XRT Team Refined Analysis
  66. GRB 090607: Swift/UVOT Upper Limits
  67. GRB 090607: Swift-BAT refined analysis of the SHB
  68. GRB 090607: GRAS001 optical observations
  69. GRB 090607: Faulkes Telescope North observations
  70. Ignore GCN/Swift-BAT Lightcurve Notices for trigger 353567
  71. GRB 090530B: Suzaku WAM observation of the prompt emission
  72. GRB 090530: Further NOT optical observations
  73. GRB 090530: RTT150 Optical Observation
  74. GRB 090529A: RTT150 Optical Observations
  75. GMRT observation of GRB 090424 afterglow
  76. GRB 090528: Suzaku WAM observation of the prompt emission
  77. GRB090529: Further NOT optical observations
  78. GRB 090531b, SMARTS optical/IR observations
  79. GRB 090531B: GROND observation
  80. GRB 090530: Early RAPTOR Optical Observations
  81. GRB090529B: ROVOR Upper Limits
  82. GRB 090531A: SARA upper limit
  83. GRB 090531B: Swift/BAT spectral lag results
  84. Corrections to GRB 090531B Swift/UVOT Upper Limits
  85. GRB 090531B, RIMOTS optical upper limits
  86. GRB 090531B: Swift/UVOT Upper Limits
  87. GRB 090528B: MASTER-II Kourovka optical limit
  88. GRB 090529: MITSuME optical observation
  89. GRB 090530: GRT Optical Observation
  90. GRB 090531B: Swift-BAT refined analysis
  91. Initial Swift/UVOT observations of GRB 090531B
  92. GRB 090531B: Swift-XRT candidate afterglow position
  93. GRB 090531B: ROTSE-III Optical Limits
  94. GRB 090531: Swift-BAT refined analysis
  95. GRB090530: R-band Observation
  96. GRB 090530: break in light curve
  97. GRB 090529: VLT spectroscopic redshift
  98. GRB 090531: GROND upper limits
  99. GRB 090531: P60 Observations
  100. GRB 090529: NOT optical observations

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