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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

32537 results found.

  1. XRF 090702: Swift-XRT refined analysis
  2. GRB 090702: UVOT upper limits
  3. GRB 090313: optical observations
  4. XRF 090702: VLT imaging
  5. XRF 090702: Swift-XRT afterglow position
  6. GRB 090404: Deep optical imaging and possible host association (correction)
  7. GRB 090404: Deep optical imaging and possible host association
  8. GRB 090628: Swift XRT refined analysis
  9. GRB 090618: RTT150 optical observations
  10. GRB 090628: Swift/UVOT Upper Limits
  11. Konus-Wind observation of GRB 090626
  12. GRB080628: SAO RAS optical observations
  13. GRB 090628: Swift-BAT refined analysis
  14. GRB090618: 15GHz radio emission faded
  15. GRB 090628: GROND upper limits
  16. GRB 090628: 1.23m CAHA optical observations
  17. GRB 090626: IPN localization
  18. GRB 090628: Swift XRT position
  19. GRB 090628: Swift detection of a burst
  20. Fermi LAT observations of GRB 090626
  21. GRB 090625B: Fermi GBM observation
  22. GRB 090423: Spitzer observations of the z~8.3 burst
  23. GRB 090625B: Swift/UVOT Upper Limits
  24. GRB 090625B: Swift-XRT refined analysis
  25. GRB 090625B: GROND upper limits
  26. GRB 090623: Suzaku WAM observation of the prompt emission
  27. GRB090618: HCT optical observations
  28. GRB 090618: SARA Second Epoch Observations
  29. GRB 090625B: Faulkes Telescope South observations
  30. GRB 090618: Correction to GCN 9568
  31. GRB 090617: Suzaku WAM observation of the prompt emission
  32. GRB 090621B: GRT Optical Observation
  33. GRB 090621A: GRT Optical Observation
  34. PAIRITEL observations of GRB 090618
  35. GRB 090621B: Fermi GBM detection
  36. GRB 090621B: Gemini spectrum of afterglow candidate
  37. GRB 090621B: P60 Observations
  38. GRB 090621: Fermi GBM observation
  39. GRB 090621B: VLA observations
  40. Konus-Wind and Konus-RF observations of GRB 090618
  41. GRB 090621B: Swift/UVOT Upper Limits
  42. GRB 090621B: Swift-BAT refined analysis
  43. GRB 090621B: Swift-XRT refined analysis
  44. GRB 090621B: RTT150 optical observations
  45. GRB 090618: RTT150 optical observations
  46. GRB 090621B: Optical Observations
  47. GRB 090621A: Swift-BAT refined analysis
  48. GRB 090621: Swift/UVOT Upper Limits
  49. GRB 090621: Swift-XRT Team refined analysis
  50. GRB090618: Spectrum and photometry from 6.0m BTA
  51. GRB 090618: BOAO V-band Observation
  52. GRB 090618: ZTSh optical observations
  53. GRB 090618 : WSRT radio detection
  54. GRB090618, underlying supernova search
  55. GRB090618: OAA-OAUV Optical observations
  56. GRB 090618: Fermi GBM observation
  57. GRB 090618, Swift-BAT refined spectral analysis
  58. VLA radio detection of GRB 090618
  59. GRB090618 - Continued optical monitoring and light curve break
  60. GRB 090618: Swift-BAT refined analysis
  61. GRB 090618: SARA observations
  62. GRB090618: Swift-XRT team refined analysis
  63. GRB090618: Swift/UVOT bright afterglow detection
  64. GRB 090618: SDSS host detection
  65. Swift XRT observations of GRB 090531A
  66. GRB 090618: AGILE observations
  67. GRB 090618: LOAO R-band Observation
  68. GRB 090618 Faulkes Telescope North observations
  69. Optical observations of GRB 090618
  70. GRB 090618: OA behavior from KAIT
  71. GRB 090618: ROTSE-III Detection of Optical Counterpart
  72. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  73. GRB 090424: WSRT Radio Observations
  74. GRB 090423: WSRT Radio Observations
  75. RXTE Discovery of Pulsations from SGR 0418+5729
  76. GRB 090531B: Fermi GBM detection
  77. Konus-RF observation of SGR burst 090605A
  78. Discovery of a new soft gamma repeater source, SGR 0418+5729
  79. GRB 090607: XRT Team Refined Analysis
  80. GRB 090607: Swift/UVOT Upper Limits
  81. GRB 090607: Swift-BAT refined analysis of the SHB
  82. GRB 090607: GRAS001 optical observations
  83. GRB 090607: Faulkes Telescope North observations
  84. Ignore GCN/Swift-BAT Lightcurve Notices for trigger 353567
  85. GRB 090530B: Suzaku WAM observation of the prompt emission
  86. GRB 090530: Further NOT optical observations
  87. GRB 090530: RTT150 Optical Observation
  88. GRB 090529A: RTT150 Optical Observations
  89. GMRT observation of GRB 090424 afterglow
  90. GRB 090528: Suzaku WAM observation of the prompt emission
  91. GRB090529: Further NOT optical observations
  92. GRB 090531b, SMARTS optical/IR observations
  93. GRB 090531B: GROND observation
  94. GRB 090530: Early RAPTOR Optical Observations
  95. GRB090529B: ROVOR Upper Limits
  96. GRB 090531A: SARA upper limit
  97. GRB 090531B: Swift/BAT spectral lag results
  98. Corrections to GRB 090531B Swift/UVOT Upper Limits
  99. GRB 090531B, RIMOTS optical upper limits
  100. GRB 090531B: Swift/UVOT Upper Limits

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