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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"

21009 results found.

  1. Konus-Wind observations of short/hard GRB 090715A
  2. Konus-Wind and Konus-RF observations of GRB 090715B
  3. GRB 090715B: Swift/UVOT followup observations
  4. GRB 090715B: break in the optical afterglow decay
  5. GRB 090715B: Observation of the optical afterglow
  6. GRB 090715B: NOT optical observations
  7. GRB 090715B - Liverpool Telescope Optical Afterglow Candidate
  8. GRB 090709A: Xinglong TNT optical upper limit
  9. VLA radio observations of GRB 090709A
  10. GRB 090621B: MTM-500 optical observations
  11. GRB 090709A: deep optical observation with the 10.4m GTC
  12. GRB090709A : WSRT Radio observation
  13. GRB 090709A: WHT LIRIS observations
  14. Konus-Wind and Konus-RF observations of GRB 090709A
  15. GRB 090709A: P60 Observations
  16. GRB 090709A: NOT optical observations
  17. GRB 090709A: RAPTOR Limits During Gamma-Ray Emission
  18. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  19. GRB 090709A: Subaru NIR observation
  20. GRB 090709: PAIRITEL NIR Upper Limits
  21. GRB 090708: Early RAPTOR Optical Limits
  22. Possible GRB090705: Swift-XRT observations
  23. GRB 090705: PAIRITEL NIR Observations
  24. XRF 090702 : RTT150 optical observations
  25. GRB 090618: Mondy optical observations
  26. GRB 090529: MTM-500 optical observations
  27. GRB 090529: Mt.Terskol optical observations
  28. GRB 090313: optical observations
  29. GRB 090618: RTT150 optical observations
  30. GRB080628: SAO RAS optical observations
  31. GRB 090628: GROND upper limits
  32. GRB 090628: 1.23m CAHA optical observations
  33. GRB 090626: IPN localization
  34. Fermi LAT observations of GRB 090626
  35. GRB 090423: Spitzer observations of the z~8.3 burst
  36. GRB 090625B: Swift-XRT refined analysis
  37. GRB 090625B: GROND upper limits
  38. GRB090618: HCT optical observations
  39. GRB 090618: SARA Second Epoch Observations
  40. GRB 090625B: Faulkes Telescope South observations
  41. GRB 090625B: Swift observation of the INTEGRAL GRB 090625B
  42. PAIRITEL observations of GRB 090618
  43. GRB 090621B: I-band observations from 1.23m CAHA
  44. GRB 090621B: Gemini spectrum of afterglow candidate
  45. GRB 090621B: P60 Observations
  46. GRB 090621B: VLA observations
  47. Konus-Wind and Konus-RF observations of GRB 090618
  48. GRB 090621B: Swift/UVOT Upper Limits
  49. GRB 090621B: RTT150 optical observations
  50. GRB 090618: RTT150 optical observations
  51. GRB 090621B: Optical Observations
  52. GRB 090621: Swift/UVOT Upper Limits
  53. GRB090618: Spectrum and photometry from 6.0m BTA
  54. GRB 090618: ZTSh optical observations
  55. GRB 090618 : WSRT radio detection
  56. GRB090618, underlying supernova search
  57. GRB090618: OAA-OAUV Optical observations
  58. VLA radio detection of GRB 090618
  59. GRB090618 - Continued optical monitoring and light curve break
  60. GRB 090618: SARA observations
  61. GRB090618: Swift/UVOT bright afterglow detection
  62. Swift XRT observations of GRB 090531A
  63. GRB 090618: AGILE observations
  64. GRB 090618 Faulkes Telescope North observations
  65. Optical observations of GRB 090618
  66. GRB 090618: Lick/KAST Spectroscopy
  67. GRB 090618: OA behavior from KAIT
  68. GRB 090618: planned XMM-Newton observation
  69. GRB 090618: ROTSE-III Detection of Optical Counterpart
  70. GRB090618: P60 Optical Afterglow
  71. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  72. GRB 090424: WSRT Radio Observations
  73. GRB 090423: WSRT Radio Observations
  74. RXTE Discovery of Pulsations from SGR 0418+5729
  75. GRB 090607: Swift/UVOT Upper Limits
  76. GRB 090607: GRAS001 optical observations
  77. GRB 090607: Faulkes Telescope North observations
  78. GRB 090530: Further NOT optical observations
  79. GRB 090529A: RTT150 Optical Observations
  80. GRB090529: Further NOT optical observations
  81. GRB 090531b, SMARTS optical/IR observations
  82. GRB 090531B: GROND observation
  83. GRB 090530: Early RAPTOR Optical Observations
  84. GRB 090531A: SARA upper limit
  85. Corrections to GRB 090531B Swift/UVOT Upper Limits
  86. Initial Swift/UVOT observations of GRB 090531B
  87. GRB 090530: break in light curve
  88. GRB 090531: GROND upper limits
  89. GRB 090531: P60 Observations
  90. GRB 090531: Swift detection of a burst
  91. GRB 090529: NOT optical observations
  92. GRB 090530: NOT optical observations
  93. GRB090530: Swift XRT refined analysis
  94. GRB090530: Swift/UVOT afterglow detection
  95. GRB 090529: Swift-XRT refined analysis
  96. GRB 090529: OSN optical observations
  97. Strong radio emission from SN 2007bg one year after the explosion - detection of spreading, off-axis GRB jet?
  98. GRB 090530: GRAS002 refined OA analysis
  99. GRB 090530: GRAS002 optical observations
  100. GRB 090530: PAIRITEL NIR Detections

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