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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"

32688 results found.

  1. GRB090618: Spectrum and photometry from 6.0m BTA
  2. GRB 090618: BOAO V-band Observation
  3. GRB 090618: ZTSh optical observations
  4. GRB 090618 : WSRT radio detection
  5. GRB090618, underlying supernova search
  6. GRB090618: OAA-OAUV Optical observations
  7. GRB 090618: Fermi GBM observation
  8. GRB 090618, Swift-BAT refined spectral analysis
  9. VLA radio detection of GRB 090618
  10. GRB090618 - Continued optical monitoring and light curve break
  11. GRB 090618: Swift-BAT refined analysis
  12. GRB 090618: SARA observations
  13. GRB090618: Swift-XRT team refined analysis
  14. GRB090618: Swift/UVOT bright afterglow detection
  15. GRB 090618: SDSS host detection
  16. Swift XRT observations of GRB 090531A
  17. GRB 090618: AGILE observations
  18. GRB 090618: LOAO R-band Observation
  19. GRB 090618 Faulkes Telescope North observations
  20. Optical observations of GRB 090618
  21. GRB 090618: OA behavior from KAIT
  22. GRB 090618: ROTSE-III Detection of Optical Counterpart
  23. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  24. GRB 090424: WSRT Radio Observations
  25. GRB 090423: WSRT Radio Observations
  26. RXTE Discovery of Pulsations from SGR 0418+5729
  27. GRB 090531B: Fermi GBM detection
  28. Konus-RF observation of SGR burst 090605A
  29. Discovery of a new soft gamma repeater source, SGR 0418+5729
  30. GRB 090607: XRT Team Refined Analysis
  31. GRB 090607: Swift/UVOT Upper Limits
  32. GRB 090607: Swift-BAT refined analysis of the SHB
  33. GRB 090607: GRAS001 optical observations
  34. GRB 090607: Faulkes Telescope North observations
  35. Ignore GCN/Swift-BAT Lightcurve Notices for trigger 353567
  36. GRB 090530B: Suzaku WAM observation of the prompt emission
  37. GRB 090530: Further NOT optical observations
  38. GRB 090530: RTT150 Optical Observation
  39. GRB 090529A: RTT150 Optical Observations
  40. GMRT observation of GRB 090424 afterglow
  41. GRB 090528: Suzaku WAM observation of the prompt emission
  42. GRB090529: Further NOT optical observations
  43. GRB 090531b, SMARTS optical/IR observations
  44. GRB 090531B: GROND observation
  45. GRB 090530: Early RAPTOR Optical Observations
  46. GRB090529B: ROVOR Upper Limits
  47. GRB 090531A: SARA upper limit
  48. GRB 090531B: Swift/BAT spectral lag results
  49. Corrections to GRB 090531B Swift/UVOT Upper Limits
  50. GRB 090531B, RIMOTS optical upper limits
  51. GRB 090531B: Swift/UVOT Upper Limits
  52. GRB 090528B: MASTER-II Kourovka optical limit
  53. GRB 090529: MITSuME optical observation
  54. GRB 090530: GRT Optical Observation
  55. GRB 090531B: Swift-BAT refined analysis
  56. Initial Swift/UVOT observations of GRB 090531B
  57. GRB 090531B: Swift-XRT candidate afterglow position
  58. GRB 090531B: ROTSE-III Optical Limits
  59. GRB 090531: Swift-BAT refined analysis
  60. GRB090530: R-band Observation
  61. GRB 090530: break in light curve
  62. GRB 090529: VLT spectroscopic redshift
  63. GRB 090531: GROND upper limits
  64. GRB 090531: P60 Observations
  65. GRB 090529: NOT optical observations
  66. GRB 090530: NOT optical observations
  67. GRB090530: Swift XRT refined analysis
  68. GRB090530: Swift/UVOT afterglow detection
  69. GRB 090529: Swift-XRT refined analysis
  70. GRB 090529: OSN optical observations
  71. Strong radio emission from SN 2007bg one year after the explosion - detection of spreading, off-axis GRB jet?
  72. GRB 090530: Swift-BAT refined analysis
  73. GRB 090530: GRAS002 refined OA analysis
  74. GRB 090530: GRAS002 optical observations
  75. GRB 090530: PAIRITEL NIR Detections
  76. GRB 090530A: ROTSE-III Detection of Optical Counterpart
  77. GRB 090529: optical observations
  78. GRB 090529: TLS Afterglow Observations
  79. GRB090529: UVOT/Swift detection of a brightening optical afterglow
  80. GRB 090529: Swift-BAT refined analysis
  81. GRB 090529: Preliminary Swift/UVOT Upper Limit
  82. GRB 090529: Xinglong TNT optical observation
  83. GRB 090520B: Fermi GBM detection
  84. GRB 090518 - NOT upper limit
  85. GRB 090516A: Konus-Wind and Swift/BAT joint spectral analysis
  86. GRB 090520: GROND upper limits
  87. GRB 090518: Fermi GBM detection
  88. GRB 090423: Fermi GBM T90 follow-up analysis results
  89. GRB 090516: Fermi GBM observation
  90. GRB 090519: Swift-XRT refined analysis
  91. GRB 090519: NOT refined analysis
  92. GRB 090519: VLT spectroscopic redshift
  93. GRB 090519: GROND observation
  94. GRB 090519: Swift/UVOT Upper Limits
  95. GRB 090519, Swift-BAT refined analysis
  96. GRB 090519: NOT afterglow candidate
  97. GRB 090518: Swift/UVOT Upper Limits
  98. GRB 090516: Observations from Stardome Observatory
  99. GRB090518: GROND upper limits
  100. GRB 090518: P60 Observations

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