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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"

23700 results found.

  1. GRB 060403: Swift detection of a burst
  2. HETE trigger H4044: RTT150 optical observations
  3. H4044, a Repeat Outburst From The Source of H4043 (="GRB060331")
  4. H4043, an unusual high-energy transient observed by HETE
  5. GRB 060322: LNA optical limit
  6. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  7. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  8. SGR 1900+14: Swift-BAT detection of a bright outburst
  9. GRB 060323 : WIDGET simultaneous optical observations
  10. GRB 060322: Confirmation of Swift XRT afterglow
  11. GRB 060211A: optical observation
  12. GRB060211B: optical observation
  13. SGR 1900+14: Swift detection of renewed activity
  14. GRB060323: NOT optical observations
  15. GRB 060322: IAC80 optical observations
  16. GRB 060322: Swift XRT afterglow candidate
  17. GRB060323: P60 Observations
  18. GRB 060323: optical afterglow confirmed
  19. GRB060323: NOT observations
  20. GRB 060323: Optical Observations
  21. GRB 060323: optical observations at TNG
  22. GRB 060323: Swift XRT refined analysis
  23. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  24. GRB 060323: Swift/XRT position
  25. GRB 060322: Refined analysis of the Swift-BAT burst
  26. GRB060323 - SDSS Pre-Burst Observations
  27. GRB 060323: Swift detection of a burst with a possible optical afterglow
  28. GRB 060322: Swift-BAT detection of a 200-sec burst
  29. GRB060219: optical observation
  30. GRB060206: optical observation
  31. GRB060218/SN2006aj: optical observations
  32. GRB 060218/SN 2006aj, LNA optical observation
  33. GRB 060319: Re-analysis of TNG data
  34. GRB 060319 optical observations at TNG
  35. GRB060319 : Liverpool Telescope optical limit
  36. GRB060319 - SDSS Pre-burst Observations
  37. GRB 060319: Swift detection of a burst
  38. GRB060313: Radio Observations
  39. GRB 060313: PROMPT Observations
  40. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  41. GRB 060313, SMARTS optical/IR observations
  42. GRB060218: SARA Observations of SN2006aj
  43. GRB060306: APO Ks-band Imaging Observations
  44. GRB 060312: Swift detection of a burst
  45. GRB 060306: SOAR Ks Observations
  46. Bright short hard GRB 060303: IPN localization and Konus spectrum
  47. Swift/UVOT observations of GRB060306
  48. GRB 060306: PROMPT Observations
  49. GRB 060306: Swift detection of a bright burst
  50. GRB 060218: RTT150 optical observations
  51. GRB060223b: optical limit
  52. GRB060218/SN 2006aj: optical observation in V
  53. GRB200618: optical polarimetry and photometry
  54. GRB 060223B: Swift XRT possible afterglow
  55. GRB 060218/SN 2006aj: WIRO optical observations
  56. GRB 060218: Refined analysis of the radio afterglow
  57. GRB 060223B: Swift-BAT refined analysis
  58. GRB 060223: Swift XRT Team preliminary analysis
  59. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  60. GRB 060223B: Swift detection of a bright burst
  61. GRB 060218/SN 2006aj: optical observations
  62. GRB 060223: Keck redshift
  63. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  64. GRB 060223: Swift detection of a burst
  65. GRB 060218: rebrightening
  66. GRB 060218: Decline in r-band flux
  67. GRB 060218: spectroscopic observations
  68. GRB 060218: Likely an underluminous GRB
  69. GRB060218: Optical Spectroscopy of GRB-SN
  70. GRB060218: UV Detection and Light Curves
  71. GRB060219: SARA Observations
  72. GRB060218: Radio Afterglow Discovery
  73. GRB 060218: optical/nIR observations at La Palma
  74. GRB060219: SDSS pre-burst observations
  75. GRB060218 : SDSS pre-burst observations
  76. GRB 060213: optical afterglow not confirmed
  77. Swift UVOT observations of GRB060213
  78. GRB 060211B: Skynet Observations
  79. GRB 060213: optical afterglow candidate
  80. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  81. GRB060213: MASTER final result
  82. GRB 060211b: WIRO NIR Observations
  83. GRB060213:_MASTER_optical_observation
  84. GRB 060213: IPN localization
  85. GRB 060211a: WIRO NIR Observations
  86. GRB060121: optical observations
  87. GRB060110: optical observations
  88. GRB060105: optical observations
  89. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  90. GRB 060211b: P60 Observations
  91. GRB 060206: SOAR Detections
  92. GRB 050826: Optical Afterglow and Host Galaxy
  93. GRB060211b: optical observation
  94. GRB060211B: Swift/XRT position
  95. GRB 060210: Optical Observations
  96. GRB060211: Faulkes North observation
  97. GRB060206, optical observations
  98. GRB 060210 : Xinglong and Lulin optical limit
  99. GRB060210: Optical Observations
  100. GRB060210: Early Optical Observations

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