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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"

28199 results found.

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

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