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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"

32508 results found.

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

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