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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"

16004 results found.

  1. GRB 081007, SMARTS optical afterglow observations
  2. GRB 081007: Early RAPTOR measurements of optical counterpart
  3. GRB 081007: Gemini-south redshift
  4. GRB 081007, Faulkes Telescope North optical observations
  5. GRB 081007, SMARTS optical/IR afterglow observations
  6. GRB 081007: REM NIR and optical counterpart
  7. GRB 081007: Swift detection of a burst with optical afterglow
  8. GRB 081003B: TAROT Calern observatory optical observations
  9. GRB 081003A: OSN optical observations
  10. GRB081003B: Optical limits from Spain
  11. GRB081001: optical limit from ASH-Centurion
  12. GRB 080928: Watcher observations
  13. GRB080928: Gemini-South Absorption Redshift
  14. GRB 080928: Swift/UVOT observations
  15. GRB 080928: GROND DETECTION
  16. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  17. GRB 080928: Swift detection of a burst with an optical counterpart
  18. GRB080922, optical upper limit
  19. GRB 080919: Swift/UVOT Refined Analysis
  20. GRB 080916C: IRSF/SIRUS NIR Observation
  21. GRB 080916C: GROND Confirmation of the Optical Afterglow
  22. GRB 080916C: GROND Confirmation of the Optical Afterglow
  23. GRB 080916A: GROND lightcurve
  24. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  25. GRB 080915a, SMARTS optical/IR observations
  26. GRB 080916: Swift detection of a burst with optical afterglow
  27. GRB 080915: ROTSE-III Optical Limits
  28. GRB 080913: VLT/FORS2 observations
  29. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  30. GRB 080905B: Photometric Redshift for the 2MASS Galaxy
  31. GRB080905A: Swift/UVOT Upper Limits
  32. GRB 080905B: Watcher optical detection
  33. GRB 080905A: Enhanced Swift-XRT position
  34. GRB 080905A: MITSuME Akeno optical upper limits
  35. GRB 080906: Refined Swift/UVOT Observations
  36. GRB 080905A: optical afterglow
  37. GRB 080906: GROND observations of the optical/NIR afterglow
  38. GRB 080905B: Refined UVOT Analysis
  39. GRB 080906: Swift detection of a burst with optical afterglow
  40. GRB 080905B: Swift detection of a burst with possible optical counterpart
  41. GRB 080905: R & I-band optical observations
  42. GRB 080903: Swift/UVOT Observations
  43. GRB 080903: optical observations
  44. GRB 080903: Liverpool Telescope observations
  45. GRB 080903: Astrotel-Caucasus optical observations
  46. GRB 080903: Optical afterglow candidate
  47. GRB 080903: TAROT Calern observatory optical observations
  48. GRB 080903: ROTSE-III Optical Limits
  49. SGR 0501+4516: Confirmation of the NIR counterpart
  50. SGR 0501+4516: Detection of possible optical counterpart
  51. GRB080825B: Swift/UVOT Upper Limits
  52. GRB 080825B: Swift-XRT team analysis
  53. GRB080825: Afterglow confirmation and redshift estimate
  54. GRB 080825B - optical counterpart candidate
  55. SGR 0501+4516: MDM Optical Observations
  56. SGR 0501+4516: Astrotel-Caucasus optical observations
  57. GRB 080822B: MASTER optical observation
  58. SGR 0501+4516: optical observations
  59. GRB 080822 (SGR 0501+4516): archival optical observations
  60. GRB080810 - optical observations
  61. GRB080810: optical observations
  62. GRB 080810: RTT150 optical observations
  63. GRB 080810: Liverpool and Faulkes North observations
  64. GRB 080810: RTT150 optical observations
  65. GRB080810: MITSuME optical observation
  66. GRB 080810: Swift/UVOT Refined Analysis
  67. GRB 080810: optical observations
  68. GRB 080810: Liverpool Telescope observations
  69. GRB 080810: D50 optical observation
  70. GRB 080810: Kanazawa optical observation
  71. GRB 080810: Observations from NOT
  72. GRB 080810: RTT150 optical observations
  73. GRB 080810: KANATA optical-NIR observation, update
  74. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  75. GRB 080810 : optical observation with KANATA
  76. GRB 080810: Swift detection of a burst with a bright optical afterglow
  77. GRB 080805: Faulkes Telescope South optical observations
  78. GRB 080804: GROND observations
  79. GRB 080727B: Late VLT imaging
  80. GRB 080804: ATCA Radio Observations
  81. GRB 080804: Swift/UVOT Refined Analysis
  82. GRB080804: Gemini South redshift confirmation
  83. GRB 080804: Faulkes Telescope South observations
  84. GRB080805 optical limit by "Pi of the Sky"
  85. GRB 080805: VLT redshift
  86. GRB 080805: GROND detection of possible afterglow
  87. GRB 080804: Swift detection of a burst with optical afterglow
  88. GRB 080804: ROTSE-III Detection of Optical Counterpart
  89. GRB 080727B: IR photometry
  90. GRB 080727A: Early IR observations
  91. GRB 080727C: TAROT Calern observatory optical observations
  92. GRB 080727B: KAIT photometry and an early lightcurve break
  93. GRB 080727B: REM NIR afterglow prompt detection
  94. GRB080727C: RTT150 optical observations
  95. Swift detection of XTE J1701-407
  96. GRB 080727B: KAIT observations
  97. GRB 080723A: optical upper limit
  98. GRB 080721 : Lulin 2nd optical follow-ups
  99. GRB 080721: OA fading and redshift
  100. GRB 080721: UVOT Follow-Up Observations

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