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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"

32509 results found.

  1. GRB 090625B: Faulkes Telescope South observations
  2. GRB 090618: Correction to GCN 9568
  3. GRB 090617: Suzaku WAM observation of the prompt emission
  4. GRB 090621B: GRT Optical Observation
  5. GRB 090621A: GRT Optical Observation
  6. PAIRITEL observations of GRB 090618
  7. GRB 090621B: Fermi GBM detection
  8. GRB 090621B: Gemini spectrum of afterglow candidate
  9. GRB 090621B: P60 Observations
  10. GRB 090621: Fermi GBM observation
  11. GRB 090621B: VLA observations
  12. Konus-Wind and Konus-RF observations of GRB 090618
  13. GRB 090621B: Swift/UVOT Upper Limits
  14. GRB 090621B: Swift-BAT refined analysis
  15. GRB 090621B: Swift-XRT refined analysis
  16. GRB 090621B: RTT150 optical observations
  17. GRB 090618: RTT150 optical observations
  18. GRB 090621B: Optical Observations
  19. GRB 090621A: Swift-BAT refined analysis
  20. GRB 090621: Swift/UVOT Upper Limits
  21. GRB 090621: Swift-XRT Team refined analysis
  22. GRB090618: Spectrum and photometry from 6.0m BTA
  23. GRB 090618: BOAO V-band Observation
  24. GRB 090618: ZTSh optical observations
  25. GRB 090618 : WSRT radio detection
  26. GRB090618, underlying supernova search
  27. GRB090618: OAA-OAUV Optical observations
  28. GRB 090618: Fermi GBM observation
  29. GRB 090618, Swift-BAT refined spectral analysis
  30. VLA radio detection of GRB 090618
  31. GRB090618 - Continued optical monitoring and light curve break
  32. GRB 090618: Swift-BAT refined analysis
  33. GRB 090618: SARA observations
  34. GRB090618: Swift-XRT team refined analysis
  35. GRB090618: Swift/UVOT bright afterglow detection
  36. GRB 090618: SDSS host detection
  37. Swift XRT observations of GRB 090531A
  38. GRB 090618: AGILE observations
  39. GRB 090618: LOAO R-band Observation
  40. GRB 090618 Faulkes Telescope North observations
  41. Optical observations of GRB 090618
  42. GRB 090618: OA behavior from KAIT
  43. GRB 090618: ROTSE-III Detection of Optical Counterpart
  44. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  45. GRB 090424: WSRT Radio Observations
  46. GRB 090423: WSRT Radio Observations
  47. RXTE Discovery of Pulsations from SGR 0418+5729
  48. GRB 090531B: Fermi GBM detection
  49. Konus-RF observation of SGR burst 090605A
  50. Discovery of a new soft gamma repeater source, SGR 0418+5729
  51. GRB 090607: XRT Team Refined Analysis
  52. GRB 090607: Swift/UVOT Upper Limits
  53. GRB 090607: Swift-BAT refined analysis of the SHB
  54. GRB 090607: GRAS001 optical observations
  55. GRB 090607: Faulkes Telescope North observations
  56. Ignore GCN/Swift-BAT Lightcurve Notices for trigger 353567
  57. GRB 090530B: Suzaku WAM observation of the prompt emission
  58. GRB 090530: Further NOT optical observations
  59. GRB 090530: RTT150 Optical Observation
  60. GRB 090529A: RTT150 Optical Observations
  61. GMRT observation of GRB 090424 afterglow
  62. GRB 090528: Suzaku WAM observation of the prompt emission
  63. GRB090529: Further NOT optical observations
  64. GRB 090531b, SMARTS optical/IR observations
  65. GRB 090531B: GROND observation
  66. GRB 090530: Early RAPTOR Optical Observations
  67. GRB090529B: ROVOR Upper Limits
  68. GRB 090531A: SARA upper limit
  69. GRB 090531B: Swift/BAT spectral lag results
  70. Corrections to GRB 090531B Swift/UVOT Upper Limits
  71. GRB 090531B, RIMOTS optical upper limits
  72. GRB 090531B: Swift/UVOT Upper Limits
  73. GRB 090528B: MASTER-II Kourovka optical limit
  74. GRB 090529: MITSuME optical observation
  75. GRB 090530: GRT Optical Observation
  76. GRB 090531B: Swift-BAT refined analysis
  77. Initial Swift/UVOT observations of GRB 090531B
  78. GRB 090531B: Swift-XRT candidate afterglow position
  79. GRB 090531B: ROTSE-III Optical Limits
  80. GRB 090531: Swift-BAT refined analysis
  81. GRB090530: R-band Observation
  82. GRB 090530: break in light curve
  83. GRB 090529: VLT spectroscopic redshift
  84. GRB 090531: GROND upper limits
  85. GRB 090531: P60 Observations
  86. GRB 090529: NOT optical observations
  87. GRB 090530: NOT optical observations
  88. GRB090530: Swift XRT refined analysis
  89. GRB090530: Swift/UVOT afterglow detection
  90. GRB 090529: Swift-XRT refined analysis
  91. GRB 090529: OSN optical observations
  92. Strong radio emission from SN 2007bg one year after the explosion - detection of spreading, off-axis GRB jet?
  93. GRB 090530: Swift-BAT refined analysis
  94. GRB 090530: GRAS002 refined OA analysis
  95. GRB 090530: GRAS002 optical observations
  96. GRB 090530: PAIRITEL NIR Detections
  97. GRB 090530A: ROTSE-III Detection of Optical Counterpart
  98. GRB 090529: optical observations
  99. GRB 090529: TLS Afterglow Observations
  100. GRB090529: UVOT/Swift detection of a brightening optical afterglow

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