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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"

21090 results found.

  1. GRB 090709: PAIRITEL NIR Upper Limits
  2. GRB 090708: Early RAPTOR Optical Limits
  3. Possible GRB090705: Swift-XRT observations
  4. GRB 090705: PAIRITEL NIR Observations
  5. XRF 090702 : RTT150 optical observations
  6. GRB 090618: Mondy optical observations
  7. GRB 090529: MTM-500 optical observations
  8. GRB 090529: Mt.Terskol optical observations
  9. GRB 090313: optical observations
  10. GRB 090618: RTT150 optical observations
  11. GRB080628: SAO RAS optical observations
  12. GRB 090628: GROND upper limits
  13. GRB 090628: 1.23m CAHA optical observations
  14. GRB 090626: IPN localization
  15. Fermi LAT observations of GRB 090626
  16. GRB 090423: Spitzer observations of the z~8.3 burst
  17. GRB 090625B: Swift-XRT refined analysis
  18. GRB 090625B: GROND upper limits
  19. GRB090618: HCT optical observations
  20. GRB 090618: SARA Second Epoch Observations
  21. GRB 090625B: Faulkes Telescope South observations
  22. GRB 090625B: Swift observation of the INTEGRAL GRB 090625B
  23. PAIRITEL observations of GRB 090618
  24. GRB 090621B: I-band observations from 1.23m CAHA
  25. GRB 090621B: Gemini spectrum of afterglow candidate
  26. GRB 090621B: P60 Observations
  27. GRB 090621B: VLA observations
  28. Konus-Wind and Konus-RF observations of GRB 090618
  29. GRB 090621B: Swift/UVOT Upper Limits
  30. GRB 090621B: RTT150 optical observations
  31. GRB 090618: RTT150 optical observations
  32. GRB 090621B: Optical Observations
  33. GRB 090621: Swift/UVOT Upper Limits
  34. GRB090618: Spectrum and photometry from 6.0m BTA
  35. GRB 090618: ZTSh optical observations
  36. GRB 090618 : WSRT radio detection
  37. GRB090618, underlying supernova search
  38. GRB090618: OAA-OAUV Optical observations
  39. VLA radio detection of GRB 090618
  40. GRB090618 - Continued optical monitoring and light curve break
  41. GRB 090618: SARA observations
  42. GRB090618: Swift/UVOT bright afterglow detection
  43. Swift XRT observations of GRB 090531A
  44. GRB 090618: AGILE observations
  45. GRB 090618 Faulkes Telescope North observations
  46. Optical observations of GRB 090618
  47. GRB 090618: Lick/KAST Spectroscopy
  48. GRB 090618: OA behavior from KAIT
  49. GRB 090618: planned XMM-Newton observation
  50. GRB 090618: ROTSE-III Detection of Optical Counterpart
  51. GRB090618: P60 Optical Afterglow
  52. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  53. GRB 090424: WSRT Radio Observations
  54. GRB 090423: WSRT Radio Observations
  55. RXTE Discovery of Pulsations from SGR 0418+5729
  56. GRB 090607: Swift/UVOT Upper Limits
  57. GRB 090607: GRAS001 optical observations
  58. GRB 090607: Faulkes Telescope North observations
  59. GRB 090530: Further NOT optical observations
  60. GRB 090529A: RTT150 Optical Observations
  61. GRB090529: Further NOT optical observations
  62. GRB 090531b, SMARTS optical/IR observations
  63. GRB 090531B: GROND observation
  64. GRB 090530: Early RAPTOR Optical Observations
  65. GRB 090531A: SARA upper limit
  66. Corrections to GRB 090531B Swift/UVOT Upper Limits
  67. Initial Swift/UVOT observations of GRB 090531B
  68. GRB 090530: break in light curve
  69. GRB 090531: GROND upper limits
  70. GRB 090531: P60 Observations
  71. GRB 090531: Swift detection of a burst
  72. GRB 090529: NOT optical observations
  73. GRB 090530: NOT optical observations
  74. GRB090530: Swift XRT refined analysis
  75. GRB090530: Swift/UVOT afterglow detection
  76. GRB 090529: Swift-XRT refined analysis
  77. GRB 090529: OSN optical observations
  78. Strong radio emission from SN 2007bg one year after the explosion - detection of spreading, off-axis GRB jet?
  79. GRB 090530: GRAS002 refined OA analysis
  80. GRB 090530: GRAS002 optical observations
  81. GRB 090530: PAIRITEL NIR Detections
  82. GRB 090530A: ROTSE-III Detection of Optical Counterpart
  83. GRB 090529: optical observations
  84. GRB 090529: TLS Afterglow Observations
  85. GRB090529: UVOT/Swift detection of a brightening optical afterglow
  86. GRB 090529: Xinglong TNT optical observation
  87. GRB 090518 - NOT upper limit
  88. GRB 090520: GROND upper limits
  89. GRB 090516: Fermi GBM observation
  90. GRB 090519: GROND observation
  91. GRB 090519: FARO Chante Perdrix Observatory optical observations
  92. GRB 090519: TAROT Calern observatory optical observations
  93. GRB 090516: Observations from Stardome Observatory
  94. GRB090518: GROND upper limits
  95. GRB 090518: P60 Observations
  96. GRB 090516: GROND OBSERVATIONS
  97. GRB 090516: VLT redshift
  98. GRB 090516 - Zadko Telescope observations
  99. GRB 090516: NOT optical observations
  100. GRB 090516: Swift/UVOT Observations

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