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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"

32687 results found.

  1. GRB090715B: WHT redshift
  2. GRB 090715B: Swift-BAT refined analysis
  3. GRB 090715B: NOT optical observations
  4. GRB 090715B - Liverpool Telescope Optical Afterglow Candidate
  5. GRB 090715A: ROTSE-III Optical Limits
  6. GRB 090715: Swift detection of a short hard burst
  7. Detection of GRB 090618 by RT-2 Experiment onboard the CORONAS-PHOTON Satellite
  8. Swift satellite anomaly
  9. GRB 090712: Fermi GBM observation
  10. GRB 090712: Swift-BAT refined analysis
  11. GRB 090709A: Xinglong TNT optical upper limit
  12. VLA radio observations of GRB 090709A
  13. GRB 090621B: MTM-500 optical observations
  14. GRB 090709A: deep optical observation with the 10.4m GTC
  15. GRB090709A : WSRT Radio observation
  16. GRB 090709A: Suzaku WAM observation of the prompt emission
  17. GRB 090709A: Swift UVOT upper limits
  18. GRB 090709A: WHT LIRIS observations
  19. GRB 090709B: Fermi GBM detection
  20. GRB 090709A: confirmation of the periodicity in the SPI-ACS data
  21. GRB 090709A: evidence for a very red afterglow at low z
  22. Konus-Wind and Konus-RF observations of GRB 090709A
  23. GRB 090709A: P60 Observations
  24. GRB 090709A: Quasiperiodic variations in the BAT light curve
  25. GRB 090709A: NOT optical observations
  26. GRB 090709A: RAPTOR Limits During Gamma-Ray Emission
  27. GRB 090709A: Swift XRT Refined Analysis
  28. GRB 090709B, Swift-BAT refined analysis
  29. GRB 090709A: Swift-BAT refined analysis
  30. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  31. GRB 090709A, RIMOTS optical upper limits
  32. GRB 090709A - PAIRITEL Discovery of a Red Afterglow
  33. GRB 090709A: Subaru NIR observation
  34. GRB 090709 : planned Suzaku-ToO observation
  35. GRB 090708 : Fermi GBM detection
  36. GRB 090709: Faulkes Telescope North Upper Limits
  37. GRB 090626: Suzaku WAM observation of the prompt emission
  38. GRB 090709: PAIRITEL NIR Upper Limits
  39. GRB 090704: Fermi GBM observation
  40. GRB 090709: ROTSE-III Optical Limits
  41. GRB 090708: Early RAPTOR Optical Limits
  42. GRB 090708, Swift-BAT refined analysis
  43. GRB 090708: ROTSE-III Optical Limits
  44. Possible GRB090705: Swift-XRT observations
  45. GRB 090705: PAIRITEL NIR Observations
  46. XRF 090702 : RTT150 optical observations
  47. GRB 090618: Mondy optical observations
  48. GRB 090529: CrAO optical upper limit
  49. GRB 090529: MTM-500 optical observations
  50. GRB 090529: Mt.Terskol optical observations
  51. XRF 090702: Swift-XRT refined analysis
  52. GRB 090702: UVOT upper limits
  53. GRB 090313: optical observations
  54. XRF 090702: VLT imaging
  55. XRF 090702: Swift-XRT afterglow position
  56. GRB 090404: Deep optical imaging and possible host association (correction)
  57. GRB 090404: Deep optical imaging and possible host association
  58. GRB 090628: Swift XRT refined analysis
  59. GRB 090618: RTT150 optical observations
  60. GRB 090628: Swift/UVOT Upper Limits
  61. Konus-Wind observation of GRB 090626
  62. GRB080628: SAO RAS optical observations
  63. GRB 090628: Swift-BAT refined analysis
  64. GRB090618: 15GHz radio emission faded
  65. GRB 090628: GROND upper limits
  66. GRB 090628: 1.23m CAHA optical observations
  67. GRB 090626: IPN localization
  68. GRB 090628: Swift XRT position
  69. GRB 090628: Swift detection of a burst
  70. Fermi LAT observations of GRB 090626
  71. GRB 090625B: Fermi GBM observation
  72. GRB 090423: Spitzer observations of the z~8.3 burst
  73. GRB 090625B: Swift/UVOT Upper Limits
  74. GRB 090625B: Swift-XRT refined analysis
  75. GRB 090625B: GROND upper limits
  76. GRB 090623: Suzaku WAM observation of the prompt emission
  77. GRB090618: HCT optical observations
  78. GRB 090618: SARA Second Epoch Observations
  79. GRB 090625B: Faulkes Telescope South observations
  80. GRB 090618: Correction to GCN 9568
  81. GRB 090617: Suzaku WAM observation of the prompt emission
  82. GRB 090621B: GRT Optical Observation
  83. GRB 090621A: GRT Optical Observation
  84. PAIRITEL observations of GRB 090618
  85. GRB 090621B: Fermi GBM detection
  86. GRB 090621B: Gemini spectrum of afterglow candidate
  87. GRB 090621B: P60 Observations
  88. GRB 090621: Fermi GBM observation
  89. GRB 090621B: VLA observations
  90. Konus-Wind and Konus-RF observations of GRB 090618
  91. GRB 090621B: Swift/UVOT Upper Limits
  92. GRB 090621B: Swift-BAT refined analysis
  93. GRB 090621B: Swift-XRT refined analysis
  94. GRB 090621B: RTT150 optical observations
  95. GRB 090618: RTT150 optical observations
  96. GRB 090621B: Optical Observations
  97. GRB 090621A: Swift-BAT refined analysis
  98. GRB 090621: Swift/UVOT Upper Limits
  99. GRB 090621: Swift-XRT Team refined analysis
  100. GRB090618: Spectrum and photometry from 6.0m BTA

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