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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"

26329 results found.

  1. GRB 060413: REM NIR Observations
  2. GRB 060413: Refined analysis of the Swift-BAT burst
  3. GRB 060403: MITSuME optical observation
  4. GRB060403: Optical Limit
  5. GRB060403: XRT refined analysis
  6. GRB 060403: Swift/UVOT upper limits
  7. SGR 1900+14: BAT observations
  8. GRB 060403: Refined analysis of the Swift-BAT burst
  9. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  10. GRB 060403: Swift detection of a burst
  11. HETE trigger H4044: RTT150 optical observations
  12. GRB060331: Swift/UVOT upper limits
  13. Swift XRT observations of the HETE transient H4043
  14. H4043, an unusual high-energy transient observed by HETE
  15. GRB 060322: LNA optical limit
  16. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  17. INTEGRAL and XMM ToO observations of SGR1900+14
  18. SGR 1900+14: Swift-BAT detection of a bright outburst
  19. GRB 060323 : WIDGET simultaneous optical observations
  20. GRB 060323: Early optical observation at Xinglong
  21. GRB 060322: Confirmation of Swift XRT afterglow
  22. GRB060323: NOT optical observations
  23. GRB 060322: IAC80 optical observations
  24. GRB 060322: Swift XRT afterglow candidate
  25. GRB060323: P60 Observations
  26. GRB 060323: Swift/UVOT Observations
  27. GRB 060323: optical afterglow confirmed
  28. GRB060323: NOT observations
  29. GRB 060323: Optical Observations
  30. GRB 060323: Refined analysis of the Swift-BAT burst
  31. GRB 060323: optical observations at TNG
  32. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  33. GRB 060322: Refined analysis of the Swift-BAT burst
  34. GRB060323, optical observation
  35. GRB060323 - SDSS Pre-Burst Observations
  36. GRB 060323: Swift detection of a burst with a possible optical afterglow
  37. GRB 060322: Swift-BAT detection of a 200-sec burst
  38. GRB 060218/SN 2006aj, LNA optical observation
  39. GRB060218: Refined photometric calibration of comparison stars
  40. GRB 060319: WHT K-band candidate afterglow
  41. GRB060319: Swift/UVOT upper limits
  42. GRB 060319: Swift-BAT refined analysis
  43. GRB 060319 optical observations at TNG
  44. GRB060319 : Liverpool Telescope optical limit
  45. GRB060319 - SDSS Pre-burst Observations
  46. GRB060313: Radio Observations
  47. GRB 060313: early afterglow NIR upper limits with REM
  48. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  49. GRB 060313: Swift/UVOT Observations
  50. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  51. GRB 060313, SMARTS optical counterpart?
  52. GRB 060313, SMARTS optical/IR observations
  53. GRB060313: optical and near infrared observations with REM
  54. GRB060218: SARA Observations of SN2006aj
  55. GRB 060312: Refined analysis of the Swift-BAT burst
  56. GRB 060218/SN 2006aj, high resolution spectra
  57. GRB 060312: Swift XRT team refined analysis
  58. GRB060306: APO Ks-band Imaging Observations
  59. GRB 060312: ROTSE-III Optical Limits
  60. Bright short hard GRB 060303: IPN localization and Konus spectrum
  61. GRB060219: Liverpool Telescope observations
  62. GRB 060306: MAGNUM observations
  63. GRB060218: analysis of the XMM-Newton observation
  64. Swift/UVOT observations of GRB060306
  65. GRB 060306: Swift-BAT refined analysis
  66. GRB 060306: Swift-XRT team refined analysis
  67. GRB 060306: Swift detection of a bright burst
  68. GRB060218: Ep,i - Eiso correlation
  69. GRB060223b: optical limit
  70. GRB 060223b: Swift/UVOT Upper Limits
  71. GRB 060218/SN 2006aj: K-380 optical observations
  72. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  73. GRB 060223B: Swift XRT possible afterglow
  74. GRB 060218/SN 2006aj: ABT observations
  75. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  76. GRB 060218 : Radio upper limits from GMRT
  77. GRB 060218/SN 2006aj: RBO optical observations
  78. GRB 060204B: GETS early limit
  79. GRB 060223A:Xinglong optical limits
  80. GRB 060223B: Swift-BAT refined analysis
  81. GRB 060223a: Swift/UVOT refined analysis
  82. GRB 060223B: Swift detection of a bright burst
  83. GRB 060223: Swift-BAT refined analysis
  84. GRB 060223: Swift detection of a burst
  85. Spectral properties of GRB060218/SN2006aj
  86. GRB 060219: Swift-BAT refined analysis
  87. GRB 060218: Decline in r-band flux
  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. GRB060218: Radio Afterglow Discovery
  94. GRB060219: SDSS pre-burst observations
  95. GRB 060219: Swift-BAT detection of a weak burst
  96. Oddball GRB 060218, transient or GRB?
  97. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  98. GRB 060218: Pre-burst detection of a possible host galaxy
  99. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  100. GRB 060211B: Swift/UVOT Upper Limits

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