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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"

16096 results found.

  1. GRB 120923A: RAPTOR Limits During Gamma-Ray Emitting Interval
  2. GRB 120922A: GROND photometric redshift
  3. GRB 120922A: Swift/UVOT Detection
  4. GRB 120923A: Swift/UVOT Upper Limit
  5. GRB 120923A: Gemini afterglow detection, high-z candidate
  6. GRB 120922A: TAROT La Silla observatory optical observations
  7. GRB 120923A: TAROT La Silla observatory optical observations
  8. GRB 120923A: ROTSE-III Optical Limits
  9. GRB 120919B: MASTER prompt optical observations
  10. GRB 120919A: Swift/UVOT Upper Limits
  11. GRB 120913B: FRAM early follow up and detection
  12. GRB 120913B: REM NIR early time detection
  13. GRB 120913B: TAROT La Silla observatory optical photometry
  14. GRB 120913B: TAROT La Silla observatory optical detection
  15. GRB 120907A: optical observations of ISON-Kislovodsk
  16. GRB 120911A: optical upper limit CrAO
  17. GRB 120911A: optical upper limit ISON-NM
  18. GRB120911A: MITSuME Okayama Optical upper limits
  19. GRB 120911A: Swift/UVOT Upper Limits
  20. GRB 120911A: ROTSE-III Optical Limits
  21. GRB 120907A: SMA upper limits
  22. GRB 120908A: Swift Observations
  23. GRB 120909A: TAROT La Silla observatory optical observations
  24. GRB 120909A: Swift/UVOT Detection
  25. GRB 120909A: X-Shooter redshift 3.93
  26. GRB 120907A: EVLA observations
  27. GRB 120907A: NOT optical observations
  28. GRB 120907A MASTER optical observations
  29. GRB 120907A: ROTSE-III Optical Limits
  30. GRB 120907A: Swift detection of a burst with optical counterpart
  31. GRB 120819A: optical upper limit
  32. GRB 120802A: optical observations in CrAO
  33. GRB 120830A: early MASTER optical limit
  34. Fermi trigger 368003226 : MASTER optical observations
  35. GRB 120819A: Swift/UVOT Upper Limits
  36. GRB 120817A: Swift/UVOT Upper Limits
  37. GRB 120817B: Deep limit on the optical afterglow from du Pont and Magellan observations
  38. GRB 120821A: Swift/UVOT Upper Limits
  39. GRB 120811C: optical observations
  40. GRB 120819A: Bassano Bresciano Observatory optical observations
  41. GRB 120819A: MITSuME Ishigakijima upper limits
  42. GRB 120819A: MITSuME Okayama Optical upper limits
  43. GRB 120819A: MASTER optical observations
  44. GRB 120811C: optical observations
  45. GRB 120816A: Swift/UVOT Detection of the Optical Afterglow
  46. GRB 120815A: MASTER-ICATE observations
  47. GRB 120817B: LCO Optical Observations
  48. GRB 120816A: optical upper limit
  49. GRB 120815A: Swift/UVOT Detection of the Optical Afterglow
  50. GRB 120816A: Bassano Bresciano Observatory optical observations
  51. GRB 120816A: BOOTES-2 observations
  52. GRB120816A: OPTIMA discovery of optical counterpart
  53. GRB 120816A: TAROT Calern observatory optical observations
  54. GRB 120816A: ROTSE-III Optical Limits
  55. GRB 120805A: Liverpool Telescope optical candidate detection
  56. GRB 120815A: TAROT La Silla observatory optical observations
  57. GRB 120811A: Swift/XRT-UVOT Obseravations
  58. GRB 120805A: optical afterglow confirmation from the NOT
  59. GRB 120805A: Enhanced Swift-XRT position
  60. GRB 120811C: EVLA Observations
  61. GRB 120811C: RTT150 optical observations
  62. GRB 120811C: MASTER-Tunka OT observations
  63. GRB 120811C: NOT redshift
  64. GRB 120811C: Bassano Bresciano Observatory optical observations
  65. GRB 120811C: RTT150 optical observations
  66. GRB 120811C: TAROT Calern observatory optical observations
  67. GRB 120811C: MASTER-Amur observations of fading OT
  68. GRB 120811C: Swift detection of a burst with an optical counterpart
  69. GRB 120803A: optical upper limit
  70. GRB 120807A: Swift/UVOT Upper Limits
  71. GRB 120714B: GROND/FORS2 detection of a supernova
  72. GRB 120802A: optical observations
  73. GRB 120804A: Gemini-North detection of an optical afterglow and putative host galaxy
  74. GRB 120807A: TAROT La Silla observatory optical observations
  75. GRB 120805A: Swift/UVOT Upper Limits
  76. GRB 120805A: 1.23m CAHA observations
  77. GRB 120805A: TAROT Calern observatory optical observations
  78. GRB 120804A: MITSuME Okayama Optical upper limits
  79. GRB 120804A: Swift/UVOT Upper Limits
  80. GRB 120803B: MITSuME Okayama Optical upper limits
  81. GRB 120803A: MITSuME Okayama Optical upper limits
  82. GRB 120803B: MITSuME Akeno Optical upper limits
  83. GRB 120802A: GRT Optical Observation
  84. GRB 120802A: MASTER optical observations
  85. GRB 120802A: optical uper limit in ISON-NM observatory
  86. GRB 120729A: break in the optical light curve
  87. GRB 120729A: Optical observations from OSN, BOOTES1/2 and IAC80
  88. GRB 120729A: RTT150 optical observations
  89. GRB 120729A: EVLA Observations
  90. GRB 120729A: Early RAPTOR Observations
  91. T100 observations of GRB 120729A
  92. GRB 120728A: GROND Afterglow discovery
  93. GRB 120729A: Swift/UVOT Detection
  94. GRB 120729A: Xinglong TNT optical upper limit
  95. GRB 120728A: Swift/UVOT Upper Limits
  96. GRB120729A - Faulkes Telescope North Optical Afterglow Candidate
  97. GRB 120729A: Swift detection of a burst with an optical afterglow
  98. GRB 120728A: GROND observations
  99. GRB 120716A: optical observation in Maidanak observatory
  100. GRB 120722A: optical upper limit

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