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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"

24385 results found.

  1. Swift satellite anomaly
  2. GRB 090712: Fermi GBM observation
  3. GRB 090713: Fermi GBM detection
  4. GRB 090712: Swift-BAT refined analysis
  5. GRB 090709A: Xinglong TNT optical upper limit
  6. GRB 090621B: MTM-500 optical observations
  7. GRB 090709A: Suzaku WAM observation of the prompt emission
  8. GRB 090709A: WHT LIRIS observations
  9. GRB 090709B: Fermi GBM detection
  10. GRB 090709A: evidence for a very red afterglow at low z
  11. Konus-Wind and Konus-RF observations of GRB 090709A
  12. GRB 090709A: P60 Observations
  13. GRB 090709A: Quasiperiodic variations in the BAT light curve
  14. GRB 090709A: NOT optical observations
  15. GRB 090709B, Swift-BAT refined analysis
  16. GRB 090709A: Swift-BAT refined analysis
  17. GRB090709A: High Energy BAT/XRT Analysis Suggests Low to Moderate Redshift
  18. GRB 090708 : Fermi GBM detection
  19. GRB 090626: Suzaku WAM observation of the prompt emission
  20. GRB 090709: PAIRITEL NIR Upper Limits
  21. GRB 090704: Fermi GBM observation
  22. GRB 090709: ROTSE-III Optical Limits
  23. GRB 090708: Early RAPTOR Optical Limits
  24. GRB 090708, Swift-BAT refined analysis
  25. GRB 090708: ROTSE-III Optical Limits
  26. GRB 090704: a long GRB found in INTEGRAL off-line analysis
  27. GRB 090706: Fermi GBM detection
  28. Swift-BAT trigger 356516 is not a GRB
  29. GRB 090705: PAIRITEL NIR Observations
  30. GRB 090705: Swift detection of a possible burst
  31. GRB 090703: Fermi GBM detection
  32. GRB 090313: optical observations
  33. XRF 090702: VLT imaging
  34. XRF 090702: a long soft GRB localized with INTEGRAL
  35. GRB 090701: Fermi GBM detection
  36. GRB 090628: Swift XRT refined analysis
  37. GRB 090630: Fermi GBM detection
  38. Konus-Wind observation of GRB 090626
  39. GRB080628: SAO RAS optical observations
  40. GRB 090628: Swift-BAT refined analysis
  41. GRB 090628: GROND upper limits
  42. GRB 090628: 1.23m CAHA optical observations
  43. GRB 090626: IPN localization
  44. Fermi LAT observations of GRB 090626
  45. GRB 090625B: Fermi GBM observation
  46. GRB 090423: Spitzer observations of the z~8.3 burst
  47. GRB 090626: Fermi GBM detection
  48. GRB 090625B: GROND upper limits
  49. GRB 090623: Suzaku WAM observation of the prompt emission
  50. GRB 090618: SARA Second Epoch Observations
  51. GRB 090625B: Faulkes Telescope South observations
  52. GRB 090625B: a long GRB localized by INTEGRAL
  53. GRB 090625: Fermi GBM detection
  54. GRB 090618: Correction to GCN 9568
  55. GRB 090617: Suzaku WAM observation of the prompt emission
  56. GRB 090618: Suzaku WAM observation of the prompt emission
  57. GRB 090623: Fermi GBM detection
  58. PAIRITEL observations of GRB 090618
  59. GRB 090621B: Fermi GBM detection
  60. GRB 090621B: I-band observations from 1.23m CAHA
  61. GRB 090621D: Fermi GBM detection
  62. GRB 090621C: Fermi GBM detection
  63. GRB 090621B: P60 Observations
  64. GRB 090621: Fermi GBM observation
  65. GRB 090620: Fermi GBM detecion
  66. Konus-Wind and Konus-RF observations of GRB 090618
  67. GRB 090621B: Swift-BAT refined analysis
  68. GRB 090621B: Optical Observations
  69. GRB 090621B: Swift detection of a short hard burst
  70. GRB 090621: Swift-XRT Team refined analysis
  71. GRB 090618: BOAO V-band Observation
  72. GRB090618, underlying supernova search
  73. GRB 090618: Fermi GBM observation
  74. GRB 090618, Swift-BAT refined spectral analysis
  75. GRB 090618: Swift-BAT refined analysis
  76. GRB 090618: SARA observations
  77. GRB 090618: AGILE observations
  78. GRB 090617: Fermi GBM detection
  79. GRB 090618 Faulkes Telescope North observations
  80. GRB 090618: ROTSE-III Detection of Optical Counterpart
  81. GRB 090616: Fermi GBM detection
  82. GRB 090612: Fermi GBM detection
  83. GRB 090610C: Fermi GBM detection
  84. GRB 090610B: Fermi GBM detection
  85. GRB 090610: Fermi GBM detection
  86. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  87. GRB 090602: Suzaku WAM observation of the prompt emission
  88. GRB 090531B: Fermi GBM detection
  89. Konus-RF observation of SGR burst 090605A
  90. Discovery of a new soft gamma repeater source, SGR 0418+5729
  91. GRB 090608: Fermi GBM detection
  92. GRB 090606: Fermi GBM detection
  93. GRB 090607: XRT Team Refined Analysis
  94. GRB 090607: Swift-BAT refined analysis of the SHB
  95. GRB 090607: Faulkes Telescope North observations
  96. GRB 090530B: Suzaku WAM observation of the prompt emission
  97. GRB 090602: Fermi GBM detection
  98. GMRT observation of GRB 090424 afterglow
  99. GRB 090528: Suzaku WAM observation of the prompt emission
  100. GRB090529: Further NOT optical observations

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