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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"

18379 results found.

  1. H4043, an unusual high-energy transient observed by HETE
  2. GRB 060322: LNA optical limit
  3. GRB 060323 : WIDGET simultaneous optical observations
  4. GRB 060323: Early optical observation at Xinglong
  5. GRB 060322: Confirmation of Swift XRT afterglow
  6. GRB060323: NOT optical observations
  7. GRB 060322: IAC80 optical observations
  8. GRB 060322: Swift XRT afterglow candidate
  9. GRB060323: P60 Observations
  10. GRB 060323: Swift/UVOT Observations
  11. GRB 060323: optical afterglow confirmed
  12. GRB060323: NOT observations
  13. GRB 060323: Optical Observations
  14. GRB 060323: optical observations at TNG
  15. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  16. GRB060323, optical observation
  17. GRB060323 - SDSS Pre-Burst Observations
  18. GRB 060323: Swift detection of a burst with a possible optical afterglow
  19. GRB 060218/SN 2006aj, LNA optical observation
  20. GRB060218: Refined photometric calibration of comparison stars
  21. GRB 060319: WHT K-band candidate afterglow
  22. GRB060319: Swift/UVOT upper limits
  23. GRB 060319 optical observations at TNG
  24. GRB060319 : Liverpool Telescope optical limit
  25. GRB060319 - SDSS Pre-burst Observations
  26. GRB060313: Radio Observations
  27. GRB 060313: early afterglow NIR upper limits with REM
  28. GRB 060313: Swift/UVOT Observations
  29. GRB 060313, SMARTS optical/IR observations
  30. GRB060313: optical and near infrared observations with REM
  31. GRB060218: SARA Observations of SN2006aj
  32. GRB 060312: Swift XRT team refined analysis
  33. GRB060306: APO Ks-band Imaging Observations
  34. GRB 060312: ROTSE-III Optical Limits
  35. GRB 060312: Swift detection of a burst
  36. Bright short hard GRB 060303: IPN localization and Konus spectrum
  37. GRB 060306: MAGNUM observations
  38. GRB060218: analysis of the XMM-Newton observation
  39. Swift/UVOT observations of GRB060306
  40. GRB 060306: Swift-BAT refined analysis
  41. GRB 060306: Swift-XRT team refined analysis
  42. GRB 060306: Swift detection of a bright burst
  43. GRB060223b: optical limit
  44. GRB 060223b: Swift/UVOT Upper Limits
  45. GRB 060218/SN 2006aj: K-380 optical observations
  46. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  47. GRB 060223B: Swift XRT possible afterglow
  48. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  49. GRB 060218 : Radio upper limits from GMRT
  50. GRB 060223A:Xinglong optical limits
  51. GRB 060223a: Swift/UVOT refined analysis
  52. GRB 060223B: Swift detection of a bright burst
  53. GRB 060218: Decline in r-band flux
  54. GRB060219: SARA Observations
  55. GRB 060219: Swift/UVOT Upper Limits
  56. GRB 051221B: Swift-XRT Team Refined Analysis
  57. GRB060218: Radio Afterglow Discovery
  58. GRB060219: SDSS pre-burst observations
  59. GRB 060219: Swift-BAT detection of a weak burst
  60. Oddball GRB 060218, transient or GRB?
  61. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  62. GRB 060218: Pre-burst detection of a possible host galaxy
  63. GRB 060211B: Swift/UVOT Upper Limits
  64. GRB060218 : SDSS pre-burst observations
  65. GRB 060213: optical afterglow not confirmed
  66. Swift UVOT observations of GRB060213
  67. GRB060213: Swift XRT observations and possible afterglow candidate
  68. GRB 060213: IPN localization
  69. GRB060211B: REM optical and NIR observations
  70. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  71. GRB 060211b: P60 Observations
  72. GRB060210: Swift/UVOT Upper Limits
  73. GRB 060210: Optical Observations
  74. GRB 060211A: Swift XRT Team Refined Analysis
  75. GRB 060211: Swift detection of a long burst
  76. GRB 060210: optical evolution
  77. GRB 060210: Swift detection of a burst
  78. GRB060210: Optical afterglow
  79. GRB060209: RTT150 optical observations
  80. GRB 060209 : TAROT optical observation
  81. GRB 060203: Swift/UVOT upper limits
  82. GRB 060121 : WIDGET Pre-trigger limit
  83. GRB060204a: Swift XRT Source is not GRB Afterglow
  84. GRB 060206: IR Detection of the Afterglow
  85. GRB 060206: Super-LOTIS observations
  86. GRB060204A: Swift/UVOT observations
  87. GRB060206: SDSS Pre-Burst Observations
  88. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  89. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  90. GRB060204C: optical observation
  91. GRB 060204A: Swift XRT upper limit
  92. GRB 060204A: FRAM optical observations
  93. GRB060204B: Swift/UVOT refined analysis
  94. GRB 060204C: optical observations
  95. Swift XRT Observation of GRB 060204C
  96. GRB 060204B: ART early limit
  97. GRB 060204b: Keck/LRIS Afterglow Confirmation
  98. GRB 060204C: Liverpool Telescopes optical limit
  99. GRB 060204C: Swift-BAT detection of a burst
  100. GRB 060204A: further INTEGRAL results

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