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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"

26494 results found.

  1. HETE trigger H4044: RTT150 optical observations
  2. GRB060331: Swift/UVOT upper limits
  3. H4044, a Repeat Outburst From The Source of H4043 (="GRB060331")
  4. Swift XRT observations of the HETE transient H4043
  5. H4043, an unusual high-energy transient observed by HETE
  6. GRB 060322: LNA optical limit
  7. GRB 060323 : WIDGET simultaneous optical observations
  8. GRB 060323: Early optical observation at Xinglong
  9. GRB 060322: Confirmation of Swift XRT afterglow
  10. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  11. GRB060323: NOT optical observations
  12. GRB 060322: IAC80 optical observations
  13. GRB 060322: Swift XRT afterglow candidate
  14. GRB060323: P60 Observations
  15. GRB 060323: Swift/UVOT Observations
  16. GRB 060323: optical afterglow confirmed
  17. GRB060323: NOT observations
  18. GRB 060323: Optical Observations
  19. GRB 060323: Refined analysis of the Swift-BAT burst
  20. GRB 060323: optical observations at TNG
  21. GRB 060323: Swift XRT refined analysis
  22. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  23. GRB060323, optical observation
  24. GRB060323 - SDSS Pre-Burst Observations
  25. GRB 060323: Swift detection of a burst with a possible optical afterglow
  26. GRB 060218/SN 2006aj, LNA optical observation
  27. GRB060218: Refined photometric calibration of comparison stars
  28. GRB 060319: WHT K-band candidate afterglow
  29. GRB060319: Swift XRT refined analysis
  30. GRB060319: Swift/UVOT upper limits
  31. GRB 060319: Swift-BAT refined analysis
  32. GRB 060319 optical observations at TNG
  33. GRB060319 : Liverpool Telescope optical limit
  34. GRB060319 - SDSS Pre-burst Observations
  35. GRB060313: Radio Observations
  36. GRB 060313: early afterglow NIR upper limits with REM
  37. Konus-Wind observation of GRB 060313
  38. GRB 060313: PROMPT Observations
  39. GRB 060313: Swift/UVOT Observations
  40. GRB 060313: Swift-XRT team refined analysis
  41. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  42. GRB 060313, SMARTS optical/IR observations
  43. GRB060313: optical and near infrared observations with REM
  44. GRB060218: SARA Observations of SN2006aj
  45. GRB 060218/SN 2006aj, high resolution spectra
  46. GRB 060312: Swift XRT team refined analysis
  47. GRB060306: APO Ks-band Imaging Observations
  48. GRB 060312: ROTSE-III Optical Limits
  49. Bright short hard GRB 060303: IPN localization and Konus spectrum
  50. GRB 060306: MAGNUM observations
  51. GRB060218: analysis of the XMM-Newton observation
  52. Swift/UVOT observations of GRB060306
  53. GRB 060306: Swift-BAT refined analysis
  54. GRB 060306: Swift-XRT team refined analysis
  55. GRB 060306: Swift detection of a bright burst
  56. GRB060223b: optical limit
  57. GRB 060121: HST observations
  58. GRB 060223b: Swift/UVOT Upper Limits
  59. GRB 060218/SN 2006aj: K-380 optical observations
  60. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  61. GRB 060223B: Swift XRT possible afterglow
  62. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  63. GRB 060218 : Radio upper limits from GMRT
  64. GRB 060223A:Xinglong optical limits
  65. GRB 060223a: Swift/UVOT refined analysis
  66. GRB 060223: Swift XRT Team preliminary analysis
  67. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  68. GRB 060223B: Swift detection of a bright burst
  69. GRB 060223: Swift-BAT refined analysis
  70. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  71. Spectral properties of GRB060218/SN2006aj
  72. GRB 060219: Swift-BAT refined analysis
  73. GRB 060218: Decline in r-band flux
  74. GRB060218: UV Detection and Light Curves
  75. GRB060219: SARA Observations
  76. GRB 060219: Swift/UVOT Upper Limits
  77. GRB 060219: Swift-XRT Team refined analysis
  78. GRB 051221B: Swift-XRT Team Refined Analysis
  79. GRB 060219: Partial refined analysis of the Swift-BAT burst
  80. GRB060218: Radio Afterglow Discovery
  81. GRB 060218: optical/nIR observations at La Palma
  82. GRB060219: SDSS pre-burst observations
  83. GRB 060219: Swift-BAT detection of a weak burst
  84. Oddball GRB 060218, transient or GRB?
  85. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  86. GRB 060218: Pre-burst detection of a possible host galaxy
  87. GRB 060211B: Swift/UVOT Upper Limits
  88. GRB060218 : SDSS pre-burst observations
  89. GRB 060213: optical afterglow not confirmed
  90. Swift UVOT observations of GRB060213
  91. GRB 060211B: Skynet Observations
  92. GRB 060213: optical afterglow candidate
  93. GRB060213: Swift XRT observations and possible afterglow candidate
  94. GRB060213: MASTER final result
  95. GRB060213:_MASTER_optical_observation
  96. Konus-Wind observation of bright hard GRB 060213
  97. GRB 060213: IPN localization
  98. GRB060211B: REM optical and NIR observations
  99. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  100. GRB 060211b: P60 Observations

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