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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"

21986 results found.

  1. GRB 080805: VLT redshift
  2. GRB 080805: GROND detection of possible afterglow
  3. GRB 080804: UVES redshift
  4. GRB 080804: ROTSE-III Detection of Optical Counterpart
  5. GRB 080802: Swift/UVOT Upper Limits
  6. GRB 080802: UVI Telescope Upper Limit
  7. GRB 080727B: IR photometry
  8. GRB 080727A: Early IR observations
  9. GRB 080727C: TAROT Calern observatory optical observations
  10. GRB 080727B: KAIT photometry and an early lightcurve break
  11. GRB 080727B: GROND redshift limit
  12. GRB 080727C: Liverpool Telescope observations
  13. GRB 080727A: VLT upper limits
  14. GRB080727C: RTT150 optical observations
  15. GRB 080727B: Swift/UVOT Upper Limits
  16. GRB080727A: Swift/UVOT Upper Limits
  17. GRB 080727B: KAIT observations
  18. GRB 080727B: REM prompt observations
  19. GRB080723B: Swift/UVOT Upper Limits
  20. GRB 080725: REM prompt observations
  21. GRB 080723A: Swift/UVOT Upper Limits
  22. GRB 080721 : Lulin 2nd optical follow-ups
  23. TNG/DOLORES redshift for GRB080721
  24. GRB 080721: UVOT Follow-Up Observations
  25. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  26. GRB 080603A: CrAO optical observations
  27. GRB 080603B: optical observations in MAO
  28. GRB 080603B: optical observations in CrAO
  29. GRB 080710: TLS observations, steepening afterglow decay
  30. GRB 0800707: optical observations
  31. GRB 080710: Rapid PROMPT Observations
  32. GRB 080710: Swift-XRT refined analysis
  33. GRB080710: Swift/UVOT observations
  34. GRB 080710: Faulkes Telescope North observations
  35. GRB 080710: Gemini spectroscopy and probable redshift
  36. UVOT white band observations of GRB080710
  37. GRB 080710: REM afterglow confirmation & brightening
  38. GRB 080710: KAIT OA candidate
  39. GRB 080707: possible break in the X-rays
  40. GRB 080707: GROND Confirmation of the Optical Afterglow
  41. UVOT observations of GRB080707
  42. GRB 080707: Swift XRT refined analysis
  43. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  44. GRB 080703: GROND Upper Limits
  45. GRB 080702B: GROND Upper Limits
  46. GRB 080703: VLT observations of the afterglow
  47. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  48. GRB 080702b: LCO optical observations
  49. GRB 080702B: Swift XRT and UVOT observations
  50. GRB 080701A: Early RAPTOR optical limits
  51. Swift Trigger 315630: Swift/UVOT Upper Limits
  52. Swift Trigger 315630: Probably not a GRB
  53. GRB 080701A: Swift/UVOT Upper Limits
  54. GRB 080701A: Early Super-LOTIS Observations
  55. GRB 080701: Swift detection of a burst
  56. GRB 080625: Swift/UVOT Follow-Up Observations
  57. GRB 080625: Further observations from OSN
  58. GRB 080625:Swift-XRT detection of the afterglow
  59. GRB 080625: Observations at OSN
  60. GRB080623: Swift UVOT followup observations
  61. GRB 080623: TAROT La Silla observatory optical observations
  62. GRB 080623: Swift detection of a burst
  63. Swift-BAT trigger 314975 possible burst
  64. GRB080607: optical observation
  65. GRB 070809: Putative host galaxy and redshift
  66. GRB 080603A: optical observations on June 04
  67. GRB080613A: Swift/UVOT Upper Limits
  68. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  69. GRB 080613B: GROND Upper Limits
  70. GRB 080613B - NOT optical and IR nondetections
  71. GRB080613B: Swift/UVOT Upper Limits
  72. GRB 080514B: Spectroscopic constraints and probable host galaxy
  73. GRB 080613: Faulkes Telescope North optical candidate
  74. GRB 080603A: Late-time Keck imaging and spectroscopy
  75. Swift observations of BAT Slew Survey event (Trigger=010)
  76. GRB 080603A: final Swift-XRT observations.
  77. GRB080607: RTT150 optical observations
  78. GRB 080603A: optical observations
  79. GRB 080607: Swift-XRT refined analysis
  80. Swift/UVOT Observations of GRB080607
  81. GRB 080605: optical observations
  82. GRB 080607 KAIT observations
  83. GRB 080605: GROND 2nd epoch observations
  84. GRB 080607 - PAIRITEL NIR detection
  85. GRB 080607: Keck/LRIS spectroscopy and redshift
  86. GRB 080607: Super-LOTIS early observations
  87. GRB 080607: ROTSE-III Detection of Optical Counterpart
  88. GRB 080605: TLS RRM Analysis, Plateau/Rebrightening, Red OT
  89. GRB 080605: Swift-UVOT refined analysis
  90. GRB 080605: Swift-XRT refined analysis
  91. GRB080605: observation by BOOTES
  92. GRB 080605: GROND detection of the optical afterglow candidate
  93. GRB080605: optical observations
  94. GRB 080604: Xinglong R band observation
  95. GRB 080603A: Xinglong R band observation
  96. GRB 080603B: TLS Afterglow Observation
  97. GRB 080603A: TLS Afterglow Observation
  98. Swift/UVOT observations of GRB080604
  99. GRB 080604: Gemini-North spectroscopy
  100. GRB 080603B : Xinglong EST observations

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