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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

32495 results found.

  1. GRB 080319A: UVOT Observations
  2. GRB 080320: Swift XRT refined analysis
  3. GRB 080319B - CARMA mm Observations
  4. GRB 080320: Early Super-LOTIS Observations
  5. GRB 080320: J detection with FLAMINGOS
  6. GRB 080319D: Swift XRT refined analysis
  7. GRB 080320: optical limit
  8. GRB 080320: Gemini-N optical afterglow
  9. Konus-Wind observation of GRB 080319C
  10. GRB 080319B: Gemini-South photometry
  11. GRB 080319B: Allen Telescope Array Observations
  12. GRB 080319B optical observations
  13. GRB 080319C, Swift-BAT refined analysis
  14. Konus-Wind observation of GRB 080319B
  15. GRB 080319B: WSRT Radio Observations
  16. GRB 080320: SDSS source and Gemini-N observations
  17. GRB 080320: optical limit from IAC80
  18. GRB 080319C: Early RAPTOR Observations
  19. GRB 080319B: second epoch imaging from Canarias (correction to GCN7469)
  20. GRB 080319C: KAIT OA observations
  21. GRB 080320: ROTSE-III Optical Limits
  22. GRB 080319B : Lulin observation of temporal break at 0.2 days
  23. GRB 080319B: ROTSE-III Observations of Optical Counterpart
  24. GRB 080319B: optical observations
  25. GRB 080319C - SDSS Pre-Burst Observations
  26. GRB 080319A SDSS Pre-Burst Observations
  27. Swift-BAT trigger 306829 is IGR J16479-4514
  28. GRB080319B - SDSS Pre-Burst Observations
  29. GRB 080319B: RAPTOR observations of a naked eye burst
  30. GRB 080319A: Swift-XRT Team Refined Analysis
  31. GRB 080319B, Swift-BAT refined analysis
  32. GRB080319B: Prompt PROMPT Detections
  33. GRB 080319C: Swift-XRT Team Refined Analysis
  34. GRB 080319B: Swift-XRT Team Refined Analysis
  35. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  36. GRB 080319C: AGILE-MCAL observation of the prompt emission
  37. GRB 080319B: Hobby-Eberly Telescope Spectroscopy
  38. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  39. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  40. GRB 080319B: TORTORA synchronous observation
  41. VLT/UVES redshift of GRB 080319B from FeII fine-structure lines
  42. GRB 080319A/B/C: INTEGRAL SPI-ACS light curves available
  43. GRB 080319A, Swift-BAT refined analysis
  44. GRB 080319B: REM early data
  45. GRB 080319b light curve by Pi-of-the-Sky
  46. VLT/UVES redshift of GRB 080319B
  47. GRB 080319C: Early Super-LOTIS Observations
  48. GRB 080319A: REM observations
  49. GRB 080319B: Change in power law decay index
  50. GRB 080319B: Gemini-South Spectroscopy
  51. GRB 080319A: optical observations at the NOT
  52. GRB0 080319B : LOAO optical observation
  53. GRB 080319B: Super-LOTIS Detection of a Bright OT
  54. GRB 080319B: REM observations
  55. GRB080319A: P60 Optical Afterglow Observations
  56. GRB 080319B: UVOT Position
  57. GRB080310, LBT and MDM photometry
  58. GRB080315: Bok Optical Observations
  59. Swift/UVOT observations of GRB 080315
  60. Swift trigger 306323: Swift-BAT/XRT refined analysis
  61. GRB 080315: Optical observations
  62. GRB080310 : Lulin Optical observations
  63. GRB080310, unusual slow decay in the optical
  64. GRB 080310: GAO 150cm telescope Optical Observation
  65. GRB080310 : Optical observations by LOAO and Lulin
  66. GRB 080310: ROTSE-III Observations of Optical Counterpart
  67. GRB080310: Optical observation by MITSuME telescope
  68. GRB080310, optical observations with the LBT
  69. GRB 080307: GAO 150cm telescope Optical Observation
  70. GRB 080229A: GAO 150cm telescope Optical Observation
  71. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  72. GRB 080307: NIR upper limit
  73. GRB 080229: NIR upper limit
  74. GRB 080310: early RAPTOR multicolor observations
  75. GRB 080310, Swift-BAT refined analysis
  76. GRB080210: optical observations
  77. GRB080307: optical upper limit
  78. GRB 080310: Swift-XRT refined analysis
  79. GRB 080310: Swift/UVOT Refined Analysis
  80. GRB 080310: Redshift from Keck/DEIMOS Spectra
  81. GRB080310 : Lulin optical observation
  82. GRB 080310: RRM optical photometry with the VLT
  83. GRB080310, detection of break in optical
  84. GRB 080310: VLT/UVES spectroscopy
  85. GRB080310, optical observations with LBT
  86. GRB 080310: Magellan redshift revision
  87. GRB 080310: Lick/Kast Spectroscopy
  88. GRB080310: Super-LOTIS suggestion of brightening
  89. GRB 080310, SMARTS optical/IR afterglow observations
  90. GRB 080310: REM observations
  91. GRB080307, optical upper limit
  92. GRB080229, optical upper limit
  93. GRB 080307: Swift-XRT Team refined analysis
  94. GRB 080307: Swift/UVOT Upper Limits
  95. GRB 080307: Early RAPTOR Limits
  96. GRB 080307, Swift-BAT refined analysis
  97. GRB 080307: TNT optical observation
  98. GRB080307: Optical upper limits
  99. GRB 080307: Gemini-N i-band observations - candidate afterglow
  100. GRB 080307: BOAO imaging - retraction and new limit

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