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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"

32494 results found.

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

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