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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"

32490 results found.

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

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