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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"

26330 results found.

  1. GRB060413: Swift/UVOT upper limits
  2. GRB 060413: REM NIR Observations
  3. GRB 060413: Refined analysis of the Swift-BAT burst
  4. GRB 060403: MITSuME optical observation
  5. GRB060403: Optical Limit
  6. GRB060403: XRT refined analysis
  7. GRB 060403: Swift/UVOT upper limits
  8. SGR 1900+14: BAT observations
  9. GRB 060403: Refined analysis of the Swift-BAT burst
  10. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  11. GRB 060403: Swift detection of a burst
  12. HETE trigger H4044: RTT150 optical observations
  13. GRB060331: Swift/UVOT upper limits
  14. Swift XRT observations of the HETE transient H4043
  15. H4043, an unusual high-energy transient observed by HETE
  16. GRB 060322: LNA optical limit
  17. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  18. INTEGRAL and XMM ToO observations of SGR1900+14
  19. SGR 1900+14: Swift-BAT detection of a bright outburst
  20. GRB 060323 : WIDGET simultaneous optical observations
  21. GRB 060323: Early optical observation at Xinglong
  22. GRB 060322: Confirmation of Swift XRT afterglow
  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: Optical Observations
  31. GRB 060323: Refined analysis of the Swift-BAT burst
  32. GRB 060323: optical observations at TNG
  33. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  34. GRB 060322: Refined analysis of the Swift-BAT burst
  35. GRB060323, optical observation
  36. GRB060323 - SDSS Pre-Burst Observations
  37. GRB 060323: Swift detection of a burst with a possible optical afterglow
  38. GRB 060322: Swift-BAT detection of a 200-sec burst
  39. GRB 060218/SN 2006aj, LNA optical observation
  40. GRB060218: Refined photometric calibration of comparison stars
  41. GRB 060319: WHT K-band candidate afterglow
  42. GRB060319: Swift/UVOT upper limits
  43. GRB 060319: Swift-BAT refined analysis
  44. GRB 060319 optical observations at TNG
  45. GRB060319 : Liverpool Telescope optical limit
  46. GRB060319 - SDSS Pre-burst Observations
  47. GRB060313: Radio Observations
  48. GRB 060313: early afterglow NIR upper limits with REM
  49. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  50. GRB 060313: Swift/UVOT Observations
  51. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  52. GRB 060313, SMARTS optical counterpart?
  53. GRB 060313, SMARTS optical/IR observations
  54. GRB060313: optical and near infrared observations with REM
  55. GRB060218: SARA Observations of SN2006aj
  56. GRB 060312: Refined analysis of the Swift-BAT burst
  57. GRB 060218/SN 2006aj, high resolution spectra
  58. GRB 060312: Swift XRT team refined analysis
  59. GRB060306: APO Ks-band Imaging Observations
  60. GRB 060312: ROTSE-III Optical Limits
  61. Bright short hard GRB 060303: IPN localization and Konus spectrum
  62. GRB060219: Liverpool Telescope observations
  63. GRB 060306: MAGNUM observations
  64. GRB060218: analysis of the XMM-Newton observation
  65. Swift/UVOT observations of GRB060306
  66. GRB 060306: Swift-BAT refined analysis
  67. GRB 060306: Swift-XRT team refined analysis
  68. GRB 060306: Swift detection of a bright burst
  69. GRB060218: Ep,i - Eiso correlation
  70. GRB060223b: optical limit
  71. GRB 060223b: Swift/UVOT Upper Limits
  72. GRB 060218/SN 2006aj: K-380 optical observations
  73. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  74. GRB 060223B: Swift XRT possible afterglow
  75. GRB 060218/SN 2006aj: ABT observations
  76. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  77. GRB 060218 : Radio upper limits from GMRT
  78. GRB 060218/SN 2006aj: RBO optical observations
  79. GRB 060204B: GETS early limit
  80. GRB 060223A:Xinglong optical limits
  81. GRB 060223B: Swift-BAT refined analysis
  82. GRB 060223a: Swift/UVOT refined analysis
  83. GRB 060223B: Swift detection of a bright burst
  84. GRB 060223: Swift-BAT refined analysis
  85. GRB 060223: Swift detection of a burst
  86. Spectral properties of GRB060218/SN2006aj
  87. GRB 060219: Swift-BAT refined analysis
  88. GRB 060218: Decline in r-band flux
  89. GRB060218: UV Detection and Light Curves
  90. GRB060219: SARA Observations
  91. GRB 060219: Swift/UVOT Upper Limits
  92. GRB 060219: Swift-XRT Team refined analysis
  93. GRB 051221B: Swift-XRT Team Refined Analysis
  94. GRB060218: Radio Afterglow Discovery
  95. GRB060219: SDSS pre-burst observations
  96. GRB 060219: Swift-BAT detection of a weak burst
  97. Oddball GRB 060218, transient or GRB?
  98. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  99. GRB 060218: Pre-burst detection of a possible host galaxy
  100. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218

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