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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"

28200 results found.

  1. GRB 090715B: Swift detection of a burst with a possible optical counterpart
  2. GRB 090715: Swift detection of a short hard burst
  3. Detection of GRB 090618 by RT-2 Experiment onboard the CORONAS-PHOTON Satellite
  4. Swift satellite anomaly
  5. GRB 090713: Fermi GBM detection
  6. GRB 090712: Swift detection of a burst
  7. GRB 090709A: Xinglong TNT optical upper limit
  8. VLA radio observations of GRB 090709A
  9. GRB 090621B: MTM-500 optical observations
  10. GRB 090709A: deep optical observation with the 10.4m GTC
  11. GRB090709A : WSRT Radio observation
  12. GRB 090709A: Swift UVOT upper limits
  13. GRB 090709A: WHT LIRIS observations
  14. GRB 090709B: Fermi GBM detection
  15. GRB 090709A: evidence for a very red afterglow at low z
  16. GRB 090709A: P60 Observations
  17. GRB 090709A: Quasiperiodic variations in the BAT light curve
  18. GRB 090709A: Swift XRT Refined Analysis
  19. GRB090709A: High Energy BAT/XRT Analysis Suggests Low to Moderate Redshift
  20. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  21. GRB 090709A: Enhanced Swift-XRT position
  22. GRB 090709A - PAIRITEL Discovery of a Red Afterglow
  23. GRB 090709A: Subaru NIR observation
  24. GRB 090709B: Swift detection of a burst
  25. GRB 090708 : Fermi GBM detection
  26. GRB 090709: Faulkes Telescope North Upper Limits
  27. GRB 090709: PAIRITEL NIR Upper Limits
  28. GRB 090709: ROTSE-III Optical Limits
  29. GRB 090709: Swift detection of a bright burst
  30. GRB 090708: Swift detection of a burst
  31. GRB 090706: Fermi GBM detection
  32. Possible GRB090705: Swift-XRT observations
  33. GRB 090705: Swift detection of a possible burst
  34. XRF 090702 : RTT150 optical observations
  35. GRB 090618: Mondy optical observations
  36. GRB 090529: CrAO optical upper limit
  37. GRB 090529: MTM-500 optical observations
  38. GRB 090529: Mt.Terskol optical observations
  39. XRF 090702: Swift-XRT refined analysis
  40. GRB 090703: Fermi GBM detection
  41. GRB 090702: UVOT upper limits
  42. XRF 090702: VLT imaging
  43. XRF 090702: Swift-XRT afterglow position
  44. GRB 090404: Deep optical imaging and possible host association
  45. GRB 090701: Fermi GBM detection
  46. GRB 090628: Swift XRT refined analysis
  47. GRB 090630: Fermi GBM detection
  48. GRB 090628: Swift/UVOT Upper Limits
  49. GRB080628: SAO RAS optical observations
  50. GRB 090628: GROND upper limits
  51. GRB 090628: Enhanced Swift-XRT position
  52. GRB 090628: 1.23m CAHA optical observations
  53. GRB 090628: Swift/UVOT Finding Chart Observation
  54. GRB 090628: Swift XRT position
  55. GRB 090628: Swift detection of a burst
  56. GRB 090423: Spitzer observations of the z~8.3 burst
  57. GRB 090625B: Swift/UVOT Upper Limits
  58. GRB 090625B: Swift-XRT refined analysis
  59. GRB 090626: Fermi GBM detection
  60. GRB 090625B: GROND upper limits
  61. GRB090618: HCT optical observations
  62. GRB 090618: SARA Second Epoch Observations
  63. GRB 090625B: Faulkes Telescope South observations
  64. GRB 090625B: Swift observation of the INTEGRAL GRB 090625B
  65. GRB 090625: Fermi GBM detection
  66. GRB 090621A: Enhanced Swift-XRT position
  67. GRB 090623: Fermi GBM detection
  68. GRB 090621B: GRT Optical Observation
  69. GRB 090621A: GRT Optical Observation
  70. PAIRITEL observations of GRB 090618
  71. GRB 090621B: Fermi GBM detection
  72. GRB 090621B: I-band observations from 1.23m CAHA
  73. GRB 090621D: Fermi GBM detection
  74. GRB 090621B: Gemini spectrum of afterglow candidate
  75. GRB 090621C: Fermi GBM detection
  76. GRB 090621B: P60 Observations
  77. GRB 090621B: VLA observations
  78. GRB 090621B: Swift/UVOT Upper Limits
  79. GRB 090621B: Swift-XRT refined analysis
  80. GRB 090621B: RTT150 optical observations
  81. GRB 090621B: Optical Observations
  82. GRB 090621B: Swift detection of a short hard burst
  83. GRB 090621: Swift/UVOT Upper Limits
  84. GRB 090621: Swift-XRT Team refined analysis
  85. GRB090618: Spectrum and photometry from 6.0m BTA
  86. GRB 090618: BOAO V-band Observation
  87. GRB 090621: Swift detection of a burst
  88. GRB 090618: ZTSh optical observations
  89. GRB 090618 : WSRT radio detection
  90. GRB090618, underlying supernova search
  91. GRB090618: OAA-OAUV Optical observations
  92. VLA radio detection of GRB 090618
  93. GRB 090618 15GHz radio detection
  94. GRB 090618: SARA observations
  95. GRB090618: Swift-XRT team refined analysis
  96. GRB090618: Swift/UVOT bright afterglow detection
  97. GRB 090618: SDSS host detection
  98. Swift XRT observations of GRB 090531A
  99. GRB 090617: Fermi GBM detection
  100. GRB 090618: LOAO R-band Observation

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Download all Circulars as a .tar.gz archive (updated once a day):
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