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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"

32551 results found.

  1. GRB 090626: Suzaku WAM observation of the prompt emission
  2. GRB 090709: PAIRITEL NIR Upper Limits
  3. GRB 090704: Fermi GBM observation
  4. GRB 090709: ROTSE-III Optical Limits
  5. GRB 090708: Early RAPTOR Optical Limits
  6. GRB 090708, Swift-BAT refined analysis
  7. GRB 090708: ROTSE-III Optical Limits
  8. Possible GRB090705: Swift-XRT observations
  9. GRB 090705: PAIRITEL NIR Observations
  10. XRF 090702 : RTT150 optical observations
  11. GRB 090618: Mondy optical observations
  12. GRB 090529: CrAO optical upper limit
  13. GRB 090529: MTM-500 optical observations
  14. GRB 090529: Mt.Terskol optical observations
  15. XRF 090702: Swift-XRT refined analysis
  16. GRB 090702: UVOT upper limits
  17. GRB 090313: optical observations
  18. XRF 090702: VLT imaging
  19. XRF 090702: Swift-XRT afterglow position
  20. GRB 090404: Deep optical imaging and possible host association (correction)
  21. GRB 090404: Deep optical imaging and possible host association
  22. GRB 090628: Swift XRT refined analysis
  23. GRB 090618: RTT150 optical observations
  24. GRB 090628: Swift/UVOT Upper Limits
  25. Konus-Wind observation of GRB 090626
  26. GRB080628: SAO RAS optical observations
  27. GRB 090628: Swift-BAT refined analysis
  28. GRB090618: 15GHz radio emission faded
  29. GRB 090628: GROND upper limits
  30. GRB 090628: 1.23m CAHA optical observations
  31. GRB 090626: IPN localization
  32. GRB 090628: Swift XRT position
  33. GRB 090628: Swift detection of a burst
  34. Fermi LAT observations of GRB 090626
  35. GRB 090625B: Fermi GBM observation
  36. GRB 090423: Spitzer observations of the z~8.3 burst
  37. GRB 090625B: Swift/UVOT Upper Limits
  38. GRB 090625B: Swift-XRT refined analysis
  39. GRB 090625B: GROND upper limits
  40. GRB 090623: Suzaku WAM observation of the prompt emission
  41. GRB090618: HCT optical observations
  42. GRB 090618: SARA Second Epoch Observations
  43. GRB 090625B: Faulkes Telescope South observations
  44. GRB 090618: Correction to GCN 9568
  45. GRB 090617: Suzaku WAM observation of the prompt emission
  46. GRB 090621B: GRT Optical Observation
  47. GRB 090621A: GRT Optical Observation
  48. PAIRITEL observations of GRB 090618
  49. GRB 090621B: Fermi GBM detection
  50. GRB 090621B: Gemini spectrum of afterglow candidate
  51. GRB 090621B: P60 Observations
  52. GRB 090621: Fermi GBM observation
  53. GRB 090621B: VLA observations
  54. Konus-Wind and Konus-RF observations of GRB 090618
  55. GRB 090621B: Swift/UVOT Upper Limits
  56. GRB 090621B: Swift-BAT refined analysis
  57. GRB 090621B: Swift-XRT refined analysis
  58. GRB 090621B: RTT150 optical observations
  59. GRB 090618: RTT150 optical observations
  60. GRB 090621B: Optical Observations
  61. GRB 090621A: Swift-BAT refined analysis
  62. GRB 090621: Swift/UVOT Upper Limits
  63. GRB 090621: Swift-XRT Team refined analysis
  64. GRB090618: Spectrum and photometry from 6.0m BTA
  65. GRB 090618: BOAO V-band Observation
  66. GRB 090618: ZTSh optical observations
  67. GRB 090618 : WSRT radio detection
  68. GRB090618, underlying supernova search
  69. GRB090618: OAA-OAUV Optical observations
  70. GRB 090618: Fermi GBM observation
  71. GRB 090618, Swift-BAT refined spectral analysis
  72. VLA radio detection of GRB 090618
  73. GRB090618 - Continued optical monitoring and light curve break
  74. GRB 090618: Swift-BAT refined analysis
  75. GRB 090618: SARA observations
  76. GRB090618: Swift-XRT team refined analysis
  77. GRB090618: Swift/UVOT bright afterglow detection
  78. GRB 090618: SDSS host detection
  79. Swift XRT observations of GRB 090531A
  80. GRB 090618: AGILE observations
  81. GRB 090618: LOAO R-band Observation
  82. GRB 090618 Faulkes Telescope North observations
  83. Optical observations of GRB 090618
  84. GRB 090618: OA behavior from KAIT
  85. GRB 090618: ROTSE-III Detection of Optical Counterpart
  86. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  87. GRB 090424: WSRT Radio Observations
  88. GRB 090423: WSRT Radio Observations
  89. RXTE Discovery of Pulsations from SGR 0418+5729
  90. GRB 090531B: Fermi GBM detection
  91. Konus-RF observation of SGR burst 090605A
  92. Discovery of a new soft gamma repeater source, SGR 0418+5729
  93. GRB 090607: XRT Team Refined Analysis
  94. GRB 090607: Swift/UVOT Upper Limits
  95. GRB 090607: Swift-BAT refined analysis of the SHB
  96. GRB 090607: GRAS001 optical observations
  97. GRB 090607: Faulkes Telescope North observations
  98. Ignore GCN/Swift-BAT Lightcurve Notices for trigger 353567
  99. GRB 090530B: Suzaku WAM observation of the prompt emission
  100. GRB 090530: Further NOT optical observations

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