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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"

32551 results found.

  1. GRB 060323: optical observations at TNG
  2. GRB 060323: Swift XRT refined analysis
  3. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  4. GRB 060323: Swift/XRT position
  5. GRB 060322: Refined analysis of the Swift-BAT burst
  6. GRB060323, optical observation
  7. GRB060206: optical observation
  8. GRB060218/SN2006aj: optical observations
  9. GRB 060218/SN 2006aj, LNA optical observation
  10. GRB060218: Refined photometric calibration of comparison stars
  11. GRB 060319: WHT K-band candidate afterglow
  12. GRB060319: Swift XRT refined analysis
  13. GRB060319: Swift/UVOT upper limits
  14. GRB 060319: Re-analysis of TNG data
  15. GRB060319: MASTER limit
  16. GRB 060319: Swift-BAT refined analysis
  17. GRB 060319 optical observations at TNG
  18. GRB060319 : Liverpool Telescope optical limit
  19. GRB060319 - SDSS Pre-burst Observations
  20. GRB060319: Swift/XRT position
  21. GRB060313: Radio Observations
  22. GRB 060313: early afterglow NIR upper limits with REM
  23. Konus-Wind observation of GRB 060313
  24. GRB060313: SSO 40inch Observations
  25. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  26. GRB 060313: PROMPT Observations
  27. GRB 060313: Swift/UVOT Observations
  28. GRB060313:Gemini South Observations
  29. GRB 060313: Swift-XRT team refined analysis
  30. GRB060313: optical observations of the afterglow candidate
  31. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  32. GRB 060313, SMARTS optical counterpart?
  33. GRB 060313: Possible optical counterpart
  34. GRB 060313: Swift XRT position
  35. GRB 060313, SMARTS optical/IR observations
  36. GRB060313: optical and near infrared observations with REM
  37. GRB060218: SARA Observations of SN2006aj
  38. GRB 060312: Refined analysis of the Swift-BAT burst
  39. GRB 060312: Swift XRT team refined analysis
  40. GRB060306: APO Ks-band Imaging Observations
  41. GRB 060312: ROTSE-III Optical Limits
  42. GRB 060306: SOAR Ks Observations
  43. GRB 060306: MAGNUM observations
  44. Swift/UVOT observations of GRB060306
  45. GRB 060306: Swift-BAT refined analysis
  46. GRB 060306: Swift-XRT team refined analysis
  47. GRB 060306: PROMPT Observations
  48. GRB 060218: RTT150 optical observations
  49. GRB060218: Ep,i - Eiso correlation
  50. GRB060223b: optical limit
  51. GRB060218/SN 2006aj: optical observation in V
  52. GRB060218/SN 2006aj: optical observation
  53. GRB 060121: HST observations
  54. GRB 060218 : GMRT observation [Correction and Improvement]
  55. GRB 060223b: Swift/UVOT Upper Limits
  56. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  57. GRB 060223B: Swift XRT possible afterglow
  58. GRB 060218/SN 2006aj: ABT observations
  59. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  60. GRB 060218 : Radio upper limits from GMRT
  61. GRB 060218/SN 2006aj: WIRO optical observations
  62. GRB 060218/SN 2006aj: RBO optical observations
  63. GRB 060204B: GETS early limit
  64. GRB 060218: Refined analysis of the radio afterglow
  65. GRB 060223B: ART optical limits
  66. GRB 060223B: Swift-BAT refined analysis
  67. GRB 060223a: Swift/UVOT refined analysis
  68. GRB 060223: Swift XRT Team preliminary analysis
  69. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  70. GRB 060223B: Swift detection of a bright burst
  71. GRB 060223: Swift-BAT refined analysis
  72. Correction to GCN 4816 on GRB060218
  73. GRB 060218/SN 2006aj: optical observations
  74. GRB060218: Optical brightening in V and R
  75. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  76. Spectral properties of GRB060218/SN2006aj
  77. GRB 060219: Swift-BAT refined analysis
  78. GRB 060218: rebrightening
  79. GRB 060218: emergence of the underlying SN spectrum
  80. GRB 060218: Decline in r-band flux
  81. GRB 060218: spectroscopic observations
  82. GRB 060218: Further refined analysis of the Swift-BAT burst
  83. GRB 060218: Likely an underluminous GRB
  84. GRB060218: Optical Spectroscopy of GRB-SN
  85. GRB060218: VLT spectroscopy
  86. GRB 060218: Optical Observations at Xinglong Obs.
  87. GRB 060219: SDSS galaxy inside XRT error circle
  88. GRB060218: UV Detection and Light Curves
  89. GRB060219: SARA Observations
  90. GRB 060219: Swift/UVOT Upper Limits
  91. GRB 060219: Swift-XRT Team refined analysis
  92. GRB 051221B: Swift-XRT Team Refined Analysis
  93. GRB 060219: Partial refined analysis of the Swift-BAT burst
  94. GRB060218: Radio Afterglow Discovery
  95. GRB 060219: Swift-XRT position typo correction
  96. GRB 060219: Swift-XRT position
  97. GRB 060218: optical/nIR observations at La Palma
  98. GRB060219: SDSS pre-burst observations
  99. Oddball GRB 060218, transient or GRB?
  100. GRB060218: Swift/XRT Team preliminary analysis of the possible burst

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