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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

21770 results found.

  1. GRB 060323: optical observations at TNG
  2. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  3. GRB 060322: Refined analysis of the Swift-BAT burst
  4. GRB060323, optical observation
  5. GRB060323 - SDSS Pre-Burst Observations
  6. GRB 060323: Swift detection of a burst with a possible optical afterglow
  7. GRB 060218/SN 2006aj, LNA optical observation
  8. GRB060218: Refined photometric calibration of comparison stars
  9. GRB 060319: WHT K-band candidate afterglow
  10. GRB060319: Swift/UVOT upper limits
  11. GRB 060319 optical observations at TNG
  12. GRB060319 : Liverpool Telescope optical limit
  13. GRB060319 - SDSS Pre-burst Observations
  14. GRB060319: Swift/XRT position
  15. GRB060313: Radio Observations
  16. GRB 060313: early afterglow NIR upper limits with REM
  17. Konus-Wind observation of GRB 060313
  18. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  19. GRB 060313: Swift/UVOT Observations
  20. GRB 060313, SMARTS optical/IR observations
  21. GRB060313: optical and near infrared observations with REM
  22. GRB 060313: Swift-BAT detection of a bright short hard burst
  23. GRB060218: SARA Observations of SN2006aj
  24. GRB 060312: Swift XRT team refined analysis
  25. GRB060306: APO Ks-band Imaging Observations
  26. GRB 060312: ROTSE-III Optical Limits
  27. Bright short hard GRB 060303: IPN localization and Konus spectrum
  28. GRB 060306: MAGNUM observations
  29. GRB060218: analysis of the XMM-Newton observation
  30. Swift/UVOT observations of GRB060306
  31. GRB 060306: Swift-XRT team refined analysis
  32. GRB 060306: Swift detection of a bright burst
  33. GRB060218: Ep,i - Eiso correlation
  34. GRB060223b: optical limit
  35. GRB 060223b: Swift/UVOT Upper Limits
  36. GRB 060218/SN 2006aj: K-380 optical observations
  37. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  38. GRB200618: optical polarimetry and photometry
  39. GRB 060223B: Swift XRT possible afterglow
  40. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  41. GRB 060218 : Radio upper limits from GMRT
  42. GRB 060223A:Xinglong optical limits
  43. GRB 060223a: Swift/UVOT refined analysis
  44. GRB 060223B: Swift detection of a bright burst
  45. GRB 060218: rebrightening
  46. GRB 060219: Swift-BAT refined analysis
  47. GRB 060218: Decline in r-band flux
  48. GRB060219: SARA Observations
  49. GRB 060219: Swift/UVOT Upper Limits
  50. GRB 051221B: Swift-XRT Team Refined Analysis
  51. GRB060218: Radio Afterglow Discovery
  52. GRB060219: SDSS pre-burst observations
  53. GRB 060219: Swift-BAT detection of a weak burst
  54. Oddball GRB 060218, transient or GRB?
  55. Brightening of the Optical Counterpart of the Possible GRB 060218
  56. GRB 060218: Pre-burst detection of a possible host galaxy
  57. GRB 060218A: ROTSE-III Possible Optical Flare
  58. GRB 060211B: Swift/UVOT Upper Limits
  59. GRB060218 : SDSS pre-burst observations
  60. GRB 060218: Swift XRT Position
  61. GRB 060213: optical afterglow not confirmed
  62. Swift UVOT observations of GRB060213
  63. GRB060213: Swift XRT observations and possible afterglow candidate
  64. Konus-Wind observation of bright hard GRB 060213
  65. GRB 060213: IPN localization
  66. GRB060211B: REM optical and NIR observations
  67. GRB 060211A: Further refined analysis of the Swift burst
  68. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  69. GRB 060211b: P60 Observations
  70. GRB 060211B: Swift/BAT refined analysis
  71. GRB060210: Swift/UVOT Upper Limits
  72. GRB 060210: Optical Observations
  73. GRB 060211: ROTSE-III Optical Limits
  74. GRB 060211: Swift detection of a long burst
  75. GRB060210: Optical Observations
  76. GRB060210: Early Optical Observations
  77. GRB 060210: optical evolution
  78. GRB 060210: Swift detection of a burst
  79. GRB060210: Optical afterglow
  80. GRB 060209 : TAROT optical observation
  81. GRB 060203: Swift/UVOT upper limits
  82. GRB 060206: TTT Observations
  83. GRB 060121 : WIDGET Pre-trigger limit
  84. GRB060204a: Swift XRT Source is not GRB Afterglow
  85. Orphan GRB Afterglow candidate
  86. GRB 060206: IR Detection of the Afterglow
  87. GRB 060204A: ROSAT Pointing
  88. GRB 060206: Super-LOTIS observations
  89. GRB060204A: Swift/UVOT observations
  90. GRB060206: SDSS Pre-Burst Observations
  91. GRB 060206: High redshift burst
  92. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  93. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  94. GRB060206: Optical afterglow
  95. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  96. GRB060203: WHT Z-band observations
  97. BAT GRB 060204C is probably not a GRB
  98. GRB060204C: optical observation
  99. GRB 060204A: Swift XRT upper limit
  100. GRB 060204A: FRAM optical observations

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