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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"

32718 results found.

  1. Fermi LAT observations of GRB 090626
  2. GRB 090625B: Fermi GBM observation
  3. GRB 090423: Spitzer observations of the z~8.3 burst
  4. GRB 090625B: Swift/UVOT Upper Limits
  5. GRB 090625B: Swift-XRT refined analysis
  6. GRB 090625B: GROND upper limits
  7. GRB 090623: Suzaku WAM observation of the prompt emission
  8. GRB090618: HCT optical observations
  9. GRB 090618: SARA Second Epoch Observations
  10. GRB 090625B: Faulkes Telescope South observations
  11. GRB 090618: Correction to GCN 9568
  12. GRB 090617: Suzaku WAM observation of the prompt emission
  13. GRB 090621B: GRT Optical Observation
  14. GRB 090621A: GRT Optical Observation
  15. PAIRITEL observations of GRB 090618
  16. GRB 090621B: Fermi GBM detection
  17. GRB 090621B: Gemini spectrum of afterglow candidate
  18. GRB 090621B: P60 Observations
  19. GRB 090621: Fermi GBM observation
  20. GRB 090621B: VLA observations
  21. Konus-Wind and Konus-RF observations of GRB 090618
  22. GRB 090621B: Swift/UVOT Upper Limits
  23. GRB 090621B: Swift-BAT refined analysis
  24. GRB 090621B: Swift-XRT refined analysis
  25. GRB 090621B: RTT150 optical observations
  26. GRB 090618: RTT150 optical observations
  27. GRB 090621B: Optical Observations
  28. GRB 090621A: Swift-BAT refined analysis
  29. GRB 090621: Swift/UVOT Upper Limits
  30. GRB 090621: Swift-XRT Team refined analysis
  31. GRB090618: Spectrum and photometry from 6.0m BTA
  32. GRB 090618: BOAO V-band Observation
  33. GRB 090618: ZTSh optical observations
  34. GRB 090618 : WSRT radio detection
  35. GRB090618, underlying supernova search
  36. GRB090618: OAA-OAUV Optical observations
  37. GRB 090618: Fermi GBM observation
  38. GRB 090618, Swift-BAT refined spectral analysis
  39. VLA radio detection of GRB 090618
  40. GRB090618 - Continued optical monitoring and light curve break
  41. GRB 090618: Swift-BAT refined analysis
  42. GRB 090618: SARA observations
  43. GRB090618: Swift-XRT team refined analysis
  44. GRB090618: Swift/UVOT bright afterglow detection
  45. GRB 090618: SDSS host detection
  46. Swift XRT observations of GRB 090531A
  47. GRB 090618: AGILE observations
  48. GRB 090618: LOAO R-band Observation
  49. GRB 090618 Faulkes Telescope North observations
  50. Optical observations of GRB 090618
  51. GRB 090618: OA behavior from KAIT
  52. GRB 090618: ROTSE-III Detection of Optical Counterpart
  53. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  54. GRB 090424: WSRT Radio Observations
  55. GRB 090423: WSRT Radio Observations
  56. RXTE Discovery of Pulsations from SGR 0418+5729
  57. GRB 090531B: Fermi GBM detection
  58. Konus-RF observation of SGR burst 090605A
  59. Discovery of a new soft gamma repeater source, SGR 0418+5729
  60. GRB 090607: XRT Team Refined Analysis
  61. GRB 090607: Swift/UVOT Upper Limits
  62. GRB 090607: Swift-BAT refined analysis of the SHB
  63. GRB 090607: GRAS001 optical observations
  64. GRB 090607: Faulkes Telescope North observations
  65. Ignore GCN/Swift-BAT Lightcurve Notices for trigger 353567
  66. GRB 090530B: Suzaku WAM observation of the prompt emission
  67. GRB 090530: Further NOT optical observations
  68. GRB 090530: RTT150 Optical Observation
  69. GRB 090529A: RTT150 Optical Observations
  70. GMRT observation of GRB 090424 afterglow
  71. GRB 090528: Suzaku WAM observation of the prompt emission
  72. GRB090529: Further NOT optical observations
  73. GRB 090531b, SMARTS optical/IR observations
  74. GRB 090531B: GROND observation
  75. GRB 090530: Early RAPTOR Optical Observations
  76. GRB090529B: ROVOR Upper Limits
  77. GRB 090531A: SARA upper limit
  78. GRB 090531B: Swift/BAT spectral lag results
  79. Corrections to GRB 090531B Swift/UVOT Upper Limits
  80. GRB 090531B, RIMOTS optical upper limits
  81. GRB 090531B: Swift/UVOT Upper Limits
  82. GRB 090528B: MASTER-II Kourovka optical limit
  83. GRB 090529: MITSuME optical observation
  84. GRB 090530: GRT Optical Observation
  85. GRB 090531B: Swift-BAT refined analysis
  86. Initial Swift/UVOT observations of GRB 090531B
  87. GRB 090531B: Swift-XRT candidate afterglow position
  88. GRB 090531B: ROTSE-III Optical Limits
  89. GRB 090531: Swift-BAT refined analysis
  90. GRB090530: R-band Observation
  91. GRB 090530: break in light curve
  92. GRB 090529: VLT spectroscopic redshift
  93. GRB 090531: GROND upper limits
  94. GRB 090531: P60 Observations
  95. GRB 090529: NOT optical observations
  96. GRB 090530: NOT optical observations
  97. GRB090530: Swift XRT refined analysis
  98. GRB090530: Swift/UVOT afterglow detection
  99. GRB 090529: Swift-XRT refined analysis
  100. GRB 090529: OSN optical observations

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