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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"

18365 results found.

  1. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  2. GRB060323, optical observation
  3. GRB060323 - SDSS Pre-Burst Observations
  4. GRB 060323: Swift detection of a burst with a possible optical afterglow
  5. GRB 060218/SN 2006aj, LNA optical observation
  6. GRB060218: Refined photometric calibration of comparison stars
  7. GRB 060319: WHT K-band candidate afterglow
  8. GRB060319: Swift/UVOT upper limits
  9. GRB 060319 optical observations at TNG
  10. GRB060319 : Liverpool Telescope optical limit
  11. GRB060319 - SDSS Pre-burst Observations
  12. GRB060313: Radio Observations
  13. GRB 060313: early afterglow NIR upper limits with REM
  14. GRB 060313: Swift/UVOT Observations
  15. GRB 060313, SMARTS optical/IR observations
  16. GRB060313: optical and near infrared observations with REM
  17. GRB060218: SARA Observations of SN2006aj
  18. GRB 060312: Swift XRT team refined analysis
  19. GRB060306: APO Ks-band Imaging Observations
  20. GRB 060312: ROTSE-III Optical Limits
  21. GRB 060312: Swift detection of a burst
  22. Bright short hard GRB 060303: IPN localization and Konus spectrum
  23. GRB 060306: MAGNUM observations
  24. GRB060218: analysis of the XMM-Newton observation
  25. Swift/UVOT observations of GRB060306
  26. GRB 060306: Swift-BAT refined analysis
  27. GRB 060306: Swift-XRT team refined analysis
  28. GRB 060306: Swift detection of a bright burst
  29. GRB060223b: optical limit
  30. GRB 060223b: Swift/UVOT Upper Limits
  31. GRB 060218/SN 2006aj: K-380 optical observations
  32. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  33. GRB 060223B: Swift XRT possible afterglow
  34. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  35. GRB 060218 : Radio upper limits from GMRT
  36. GRB 060223A:Xinglong optical limits
  37. GRB 060223a: Swift/UVOT refined analysis
  38. GRB 060223B: Swift detection of a bright burst
  39. GRB 060218: Decline in r-band flux
  40. GRB060219: SARA Observations
  41. GRB 060219: Swift/UVOT Upper Limits
  42. GRB 051221B: Swift-XRT Team Refined Analysis
  43. GRB060218: Radio Afterglow Discovery
  44. GRB060219: SDSS pre-burst observations
  45. GRB 060219: Swift-BAT detection of a weak burst
  46. Oddball GRB 060218, transient or GRB?
  47. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  48. GRB 060218: Pre-burst detection of a possible host galaxy
  49. GRB 060211B: Swift/UVOT Upper Limits
  50. GRB060218 : SDSS pre-burst observations
  51. GRB 060213: optical afterglow not confirmed
  52. Swift UVOT observations of GRB060213
  53. GRB060213: Swift XRT observations and possible afterglow candidate
  54. GRB 060213: IPN localization
  55. GRB060211B: REM optical and NIR observations
  56. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  57. GRB 060211b: P60 Observations
  58. GRB060210: Swift/UVOT Upper Limits
  59. GRB 060210: Optical Observations
  60. GRB 060211A: Swift XRT Team Refined Analysis
  61. GRB 060211: Swift detection of a long burst
  62. GRB 060210: optical evolution
  63. GRB 060210: Swift detection of a burst
  64. GRB060210: Optical afterglow
  65. GRB060209: RTT150 optical observations
  66. GRB 060209 : TAROT optical observation
  67. GRB 060203: Swift/UVOT upper limits
  68. GRB 060121 : WIDGET Pre-trigger limit
  69. GRB060204a: Swift XRT Source is not GRB Afterglow
  70. GRB 060206: IR Detection of the Afterglow
  71. GRB 060206: Super-LOTIS observations
  72. GRB060204A: Swift/UVOT observations
  73. GRB060206: SDSS Pre-Burst Observations
  74. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  75. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  76. GRB060204C: optical observation
  77. GRB 060204A: Swift XRT upper limit
  78. GRB 060204A: FRAM optical observations
  79. GRB060204B: Swift/UVOT refined analysis
  80. GRB 060204C: optical observations
  81. Swift XRT Observation of GRB 060204C
  82. GRB 060204B: ART early limit
  83. GRB 060204b: Keck/LRIS Afterglow Confirmation
  84. GRB 060204C: Liverpool Telescopes optical limit
  85. GRB 060204C: Swift-BAT detection of a burst
  86. GRB 060204A: further INTEGRAL results
  87. GRB060204B, optical observation
  88. GRB060204B - SDSS pre-burst observations
  89. GRB 060204B: Swift detection of a burst
  90. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  91. GRB 060203: RTT150 optical observations
  92. GRB 060203: IR Counterpart
  93. Possible GRB 060203: optical observations at Asiago
  94. GRB 060202: Gemini-N J, H, K_s observations
  95. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  96. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  97. GRB060202, optical observation
  98. GRB 060202: Swift/UVOT upper limits
  99. GRB 060202: Swift XRT Team Refined Analysis
  100. GRB 060121: Gemini Late-time Observations

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