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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"

42942 results found.

  1. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  2. GRB 060403: Swift detection of a burst
  3. GRB060331: Swift/UVOT upper limits
  4. H4044, a Repeat Outburst From The Source of H4043 (="GRB060331")
  5. Swift XRT observations of the HETE transient H4043
  6. HETE Trigger 4043: ROTSE-III Optical Limits
  7. H4043, an unusual high-energy transient observed by HETE
  8. GRB 060322: LNA optical limit
  9. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  10. INTEGRAL and XMM ToO observations of SGR1900+14
  11. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  12. SGR 1900+14: Swift-BAT detection of a bright outburst
  13. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  14. GRB 060323 : WIDGET simultaneous optical observations
  15. GRB 060323: Early optical observation at Xinglong
  16. GRB060218, optical observations
  17. GRB 060322: Confirmation of Swift XRT afterglow
  18. GRB 060211A: optical observation
  19. GRB060323: optical limit
  20. GRB060211B: optical observation
  21. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  22. SGR 1900+14: Swift detection of renewed activity
  23. GRB060323: NOT optical observations
  24. GRB 060322: IAC80 optical observations
  25. GRB 060322: Swift XRT afterglow candidate
  26. GRB060323: P60 Observations
  27. GRB 060323: Swift/UVOT Observations
  28. GRB 060323: optical afterglow confirmed
  29. GRB060323: NOT observations
  30. GRB 060323: Tautenburg OT candidate retraction
  31. GRB 060323: Refined analysis of the Swift-BAT burst
  32. GRB 060323: optical observations at TNG
  33. GRB 060323: Swift XRT refined analysis
  34. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  35. GRB 060323: Swift/XRT position
  36. GRB 060322: Refined analysis of the Swift-BAT burst
  37. GRB060323 - SDSS Pre-Burst Observations
  38. GRB 060323: Swift detection of a burst with a possible optical afterglow
  39. GRB 060322: Swift-BAT detection of a 200-sec burst
  40. GRB060219: optical observation
  41. GRB060206: optical observation
  42. GRB060218/SN2006aj: optical observations
  43. GRB 060218/SN 2006aj, LNA optical observation
  44. GRB060218: Refined photometric calibration of comparison stars
  45. GRB 060319: WHT K-band candidate afterglow
  46. GRB 060319: IAC-80 optical observations
  47. GRB060319: Swift XRT refined analysis
  48. GRB060319: MASTER limit
  49. GRB 060319: Swift-BAT refined analysis
  50. GRB060319 : Liverpool Telescope optical limit
  51. GRB060319: MASTER optical observation
  52. GRB060319 - SDSS Pre-burst Observations
  53. GRB060319: Swift/XRT position
  54. GRB 060319: Swift detection of a burst
  55. GRB060313: Radio Observations
  56. GRB 060313: early afterglow NIR upper limits with REM
  57. IBAS Alert n. 3221: not a GRB
  58. Konus-Wind observation of GRB 060313
  59. GRB060313: SSO 40inch Observations
  60. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  61. GRB 060313: PROMPT Observations
  62. GRB 060313: Swift/UVOT Observations
  63. GRB060313:Gemini South Observations
  64. GRB 060313: Swift-XRT team refined analysis
  65. GRB060313: optical observations of the afterglow candidate
  66. GRB 060313, SMARTS optical counterpart?
  67. GRB 060313: Possible optical counterpart
  68. GRB 060313, SMARTS optical/IR observations
  69. GRB060313: optical and near infrared observations with REM
  70. GRB 060313: Swift-BAT detection of a bright short hard burst
  71. GRB060218: SARA Observations of SN2006aj
  72. GRB060312: Swift UVOT observation
  73. GRB 060312: Refined analysis of the Swift-BAT burst
  74. GRB 060218/SN 2006aj, high resolution spectra
  75. GRB 060312: Swift XRT team refined analysis
  76. GRB060306: APO Ks-band Imaging Observations
  77. GRB 060312: ROTSE-III Optical Limits
  78. GRB 060312: Swift detection of a burst
  79. IBAS Alert n. 3218 : not a real GRB
  80. GRB 060306: SOAR Ks Observations
  81. Bright short hard GRB 060303: IPN localization and Konus spectrum
  82. GRB060219: Liverpool Telescope observations
  83. GRB 060306: MAGNUM observations
  84. GRB060218: analysis of the XMM-Newton observation
  85. GRB 060306: Swift-BAT refined analysis
  86. GRB 060306: Swift-XRT team refined analysis
  87. GRB 060306: PROMPT Observations
  88. GRB 060306: Swift detection of a bright burst
  89. GRB 060218: RTT150 optical observations
  90. GRB060218: Ep,i - Eiso correlation
  91. GRB060223b: optical limit
  92. GRB060218/SN 2006aj: optical observation in V
  93. GRB060218/SN 2006aj: optical observation
  94. GRB 060121: HST observations
  95. GRB 060218 : GMRT observation [Correction and Improvement]
  96. GRB 060218/SN 2006aj: K-380 optical observations
  97. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  98. GRB200618: optical polarimetry and photometry
  99. GRB 060223B: Swift XRT possible afterglow
  100. GRB 060218/SN 2006aj: ABT observations

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