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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"

28123 results found.

  1. SGR 1900+14: BAT observations
  2. GRB 060403: Refined analysis of the Swift-BAT burst
  3. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  4. GRB 060403: Swift detection of a burst
  5. HETE trigger H4044: RTT150 optical observations
  6. GRB060331: Swift/UVOT upper limits
  7. Swift XRT observations of the HETE transient H4043
  8. H4043, an unusual high-energy transient observed by HETE
  9. GRB 060322: LNA optical limit
  10. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  11. INTEGRAL and XMM ToO observations of SGR1900+14
  12. SGR 1900+14: Swift-BAT detection of a bright outburst
  13. GRB 060323 : WIDGET simultaneous optical observations
  14. GRB 060323: Early optical observation at Xinglong
  15. GRB 060322: Confirmation of Swift XRT afterglow
  16. GRB060323: NOT optical observations
  17. GRB 060322: IAC80 optical observations
  18. GRB 060322: Swift XRT afterglow candidate
  19. GRB060323: P60 Observations
  20. GRB 060323: Swift/UVOT Observations
  21. GRB 060323: optical afterglow confirmed
  22. GRB060323: NOT observations
  23. GRB 060323: Optical Observations
  24. GRB 060323: Refined analysis of the Swift-BAT burst
  25. GRB 060323: optical observations at TNG
  26. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  27. GRB 060322: Refined analysis of the Swift-BAT burst
  28. GRB060323, optical observation
  29. GRB060323 - SDSS Pre-Burst Observations
  30. GRB 060323: Swift detection of a burst with a possible optical afterglow
  31. GRB 060322: Swift-BAT detection of a 200-sec burst
  32. GRB 060218/SN 2006aj, LNA optical observation
  33. GRB060218: Refined photometric calibration of comparison stars
  34. GRB 060319: WHT K-band candidate afterglow
  35. GRB060319: Swift/UVOT upper limits
  36. GRB 060319: Swift-BAT refined analysis
  37. GRB 060319 optical observations at TNG
  38. GRB060319 : Liverpool Telescope optical limit
  39. GRB060319 - SDSS Pre-burst Observations
  40. GRB060313: Radio Observations
  41. GRB 060313: early afterglow NIR upper limits with REM
  42. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  43. GRB 060313: Swift/UVOT Observations
  44. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  45. GRB 060313, SMARTS optical counterpart?
  46. GRB 060313, SMARTS optical/IR observations
  47. GRB060313: optical and near infrared observations with REM
  48. GRB060218: SARA Observations of SN2006aj
  49. GRB 060312: Refined analysis of the Swift-BAT burst
  50. GRB 060218/SN 2006aj, high resolution spectra
  51. GRB 060312: Swift XRT team refined analysis
  52. GRB060306: APO Ks-band Imaging Observations
  53. GRB 060312: ROTSE-III Optical Limits
  54. Bright short hard GRB 060303: IPN localization and Konus spectrum
  55. GRB060219: Liverpool Telescope observations
  56. GRB 060306: MAGNUM observations
  57. GRB060218: analysis of the XMM-Newton observation
  58. Swift/UVOT observations of GRB060306
  59. GRB 060306: Swift-BAT refined analysis
  60. GRB 060306: Swift-XRT team refined analysis
  61. GRB 060306: Swift detection of a bright burst
  62. GRB060218: Ep,i - Eiso correlation
  63. GRB060223b: optical limit
  64. GRB 060223b: Swift/UVOT Upper Limits
  65. GRB 060218/SN 2006aj: K-380 optical observations
  66. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  67. GRB 060223B: Swift XRT possible afterglow
  68. GRB 060218/SN 2006aj: ABT observations
  69. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  70. GRB 060218 : Radio upper limits from GMRT
  71. GRB 060218/SN 2006aj: RBO optical observations
  72. GRB 060204B: GETS early limit
  73. GRB 060223A:Xinglong optical limits
  74. GRB 060223B: Swift-BAT refined analysis
  75. GRB 060223a: Swift/UVOT refined analysis
  76. GRB 060223B: Swift detection of a bright burst
  77. GRB 060223: Swift-BAT refined analysis
  78. GRB 060223: Swift detection of a burst
  79. Spectral properties of GRB060218/SN2006aj
  80. GRB 060219: Swift-BAT refined analysis
  81. GRB 060218: Decline in r-band flux
  82. GRB060218: UV Detection and Light Curves
  83. GRB060219: SARA Observations
  84. GRB 060219: Swift/UVOT Upper Limits
  85. GRB 060219: Swift-XRT Team refined analysis
  86. GRB 051221B: Swift-XRT Team Refined Analysis
  87. GRB060218: Radio Afterglow Discovery
  88. GRB060219: SDSS pre-burst observations
  89. GRB 060219: Swift-BAT detection of a weak burst
  90. Oddball GRB 060218, transient or GRB?
  91. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  92. GRB 060218: Pre-burst detection of a possible host galaxy
  93. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  94. GRB 060211B: Swift/UVOT Upper Limits
  95. GRB060218 : SDSS pre-burst observations
  96. GRB 060218: Swift-BAT detection of a possible burst
  97. GRB 060213: optical afterglow not confirmed
  98. Swift UVOT observations of GRB060213
  99. GRB 060211B: Skynet Observations
  100. GRB060213: Swift XRT observations and possible afterglow candidate

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