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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"

21957 results found.

  1. GRB 060218/SN 2006aj, high resolution spectra
  2. GRB060306: APO Ks-band Imaging Observations
  3. GRB 060306: SOAR Ks Observations
  4. GRB060219: Liverpool Telescope observations
  5. GRB 060306: MAGNUM observations
  6. Swift/UVOT observations of GRB060306
  7. GRB 060306: PROMPT Observations
  8. GRB 060218: RTT150 optical observations
  9. GRB060218/SN 2006aj: optical observation in V
  10. GRB060218/SN 2006aj: optical observation
  11. GRB 060121: HST observations
  12. GRB 060223b: Swift/UVOT Upper Limits
  13. GRB 060218/SN 2006aj: K-380 optical observations
  14. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  15. GRB200618: optical polarimetry and photometry
  16. GRB 060218/SN 2006aj: ABT observations
  17. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  18. GRB 060218/SN 2006aj: WIRO optical observations
  19. GRB 060218/SN 2006aj: RBO optical observations
  20. GRB 060218: Refined analysis of the radio afterglow
  21. GRB 060223A:Xinglong optical limits
  22. Correction to GCN 4816 on GRB060218
  23. GRB 060218/SN 2006aj: optical observations
  24. GRB060218: Optical brightening in V and R
  25. GRB 060223: Keck redshift
  26. GRB 060218: rebrightening
  27. GRB 060218: emergence of the underlying SN spectrum
  28. GRB 060218: Decline in r-band flux
  29. GRB 060218: spectroscopic observations
  30. GRB 060218: Likely an underluminous GRB
  31. GRB060218: Optical Spectroscopy of GRB-SN
  32. GRB 060218: Optical Observations at Xinglong Obs.
  33. GRB 060219: SDSS galaxy inside XRT error circle
  34. GRB060218: UV Detection and Light Curves
  35. GRB060219: SARA Observations
  36. GRB 051221B: Swift-XRT Team Refined Analysis
  37. GRB060218: Radio Afterglow Discovery
  38. GRB 060218: MDM Redshift
  39. GRB 060218: optical/nIR observations at La Palma
  40. GRB060219: SDSS pre-burst observations
  41. Oddball GRB 060218, transient or GRB?
  42. Brightening of the Optical Counterpart of the Possible GRB 060218
  43. GRB 060218: MDM Observations
  44. GRB 060218: Pre-burst detection of a possible host galaxy
  45. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  46. GRB060218 : SDSS pre-burst observations
  47. GRB 060213: optical afterglow not confirmed
  48. Swift UVOT observations of GRB060213
  49. GRB 060211B: Skynet Observations
  50. GRB 060213: optical afterglow candidate
  51. GRB060213: Swift XRT observations and possible afterglow candidate
  52. GRB 060211b: WIRO NIR Observations
  53. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  54. GRB 060210: Radio Observations
  55. GRB 060211a: WIRO NIR Observations
  56. GRB060211B: REM optical and NIR observations
  57. GRB060121: optical observations
  58. GRB060110: optical observations
  59. GRB060105: optical observations
  60. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  61. GRB 060211b: P60 Observations
  62. GRB 050826: Optical Afterglow and Host Galaxy
  63. GRB 060210: Optical Observations
  64. GRB060206, optical observations
  65. GRB060210: Optical Observations
  66. GRB060210: Early Optical Observations
  67. GRB 060210: optical evolution
  68. GRB060210:Faulkes Telescope North Afterglow Confirmation
  69. GRB 060210: candidate afterglow
  70. GRB 060206: Swift/UVOT Observations
  71. GRB060209: RTT150 optical observations
  72. GRB 060206: near-infrared observations (JK' imaging)
  73. GRB 060206: WSRT Radio Observations
  74. GRB 060206: TTT Observations
  75. GRB 060206: Tenagra II Observations
  76. GRB060204a: Swift XRT Source is not GRB Afterglow
  77. GRB 060206: optical observations at Asiago
  78. Orphan GRB Afterglow candidate
  79. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  80. GRB 060206: Lick 3m Spectroscopy
  81. GRB 060206: Super-LOTIS observations
  82. GRB060204A: Swift/UVOT observations
  83. GRB 060206 : Lulin optical observations
  84. GRB060206: SDSS Pre-Burst Observations
  85. GRB060206: Swift XRT Refined Analysis
  86. GRB060206: P60 Optical Observations
  87. GRB 060206: KAIT observations
  88. GRB060206: SARA Detection
  89. GRB 060206: RAPTOR observations of afterglow candidate variability.
  90. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  91. GRB060206: Optical afterglow
  92. GRB060203: WHT Z-band observations
  93. GRB060204C: optical observation
  94. GRB 060204A: FRAM optical observations
  95. GRB 060204C: optical observations
  96. GRB 060204C: OSN limits
  97. GRB 060204b: Keck/LRIS Afterglow Confirmation
  98. GRB 060124: Radio Observations
  99. GRB060204B - SDSS pre-burst observations
  100. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation

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