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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"

31731 results found.

  1. GRB 080330: error in reported XRT position
  2. GRB 080330: Liverpool Telescope Optical observations
  3. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  4. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  5. GRB 080328: BTA optical imaging and spectroscopy
  6. GRB 080328, Swift-BAT refined analysis
  7. GRB 080328: Swift XRT refined analysis
  8. GRB 080325, Swift-BAT refined analysis
  9. Swift/UVOT observations of GRB080328
  10. GRB080325 - I and z-band Imaging
  11. GRB080328: Faulkes Telescope North observations
  12. GRB 080325: Subaru detection of NIR afterglow candidate
  13. GRB080310, late-time photometry with LBT
  14. GRB 080325: MITSuME Akeno optical upper limits
  15. GRB080325: XRT Refined Analysis
  16. GRB 080325: GROND Observations
  17. GRB080319B: optical observations
  18. GRB 080325: Swift/UVOT Upper Limits
  19. GRB 080319C: Gemini-North spectroscopic redshift
  20. GRB 080325: Early observations from OSN
  21. GRB 080325: NIR afterglow candidate
  22. GRB 080319D: GROND Detection of the Optical Counterpart
  23. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  24. GRB 080319B: Spitzer Mid-infrared Observations
  25. GRB 080319C: Suzaku WAM observation of the prompt emission
  26. GRB 080319B: Second & Third Epoch WSRT Radio Observations
  27. Radio Detection of GRB 080319B
  28. GRB 080320, Swift-BAT refined analysis
  29. GRB 080319D: GROND Observations
  30. GRB 080319B: TORTORA light curve
  31. GRB 080319B: optical upper limit
  32. GRB 080319D: optical upper limit
  33. GRB080319B: Time-Independent XRT Spectrum
  34. GRB 080319D, Swift-BAT refined analysis
  35. GRB 080319C: UVOT Observations
  36. GRB 080319B: UVOT Observations
  37. GRB 080319A: UVOT Observations
  38. GRB 080320: Swift XRT refined analysis
  39. GRB 080319B - CARMA mm Observations
  40. GRB 080320: Early Super-LOTIS Observations
  41. GRB 080320: J detection with FLAMINGOS
  42. GRB 080319D: Swift XRT refined analysis
  43. GRB 080320: optical limit
  44. GRB 080320: Gemini-N optical afterglow
  45. Konus-Wind observation of GRB 080319C
  46. GRB 080319B: Gemini-South photometry
  47. GRB 080319B: Allen Telescope Array Observations
  48. GRB 080319B optical observations
  49. GRB 080319C, Swift-BAT refined analysis
  50. Konus-Wind observation of GRB 080319B
  51. GRB 080319B: WSRT Radio Observations
  52. GRB 080320: SDSS source and Gemini-N observations
  53. GRB 080320: optical limit from IAC80
  54. GRB 080319C: Early RAPTOR Observations
  55. GRB 080319B: second epoch imaging from Canarias (correction to GCN7469)
  56. GRB 080319C: KAIT OA observations
  57. GRB 080320: ROTSE-III Optical Limits
  58. GRB 080319B : Lulin observation of temporal break at 0.2 days
  59. GRB 080319B: ROTSE-III Observations of Optical Counterpart
  60. GRB 080319B: optical observations
  61. GRB 080319C - SDSS Pre-Burst Observations
  62. GRB 080319A SDSS Pre-Burst Observations
  63. Swift-BAT trigger 306829 is IGR J16479-4514
  64. GRB080319B - SDSS Pre-Burst Observations
  65. GRB 080319B: RAPTOR observations of a naked eye burst
  66. GRB 080319A: Swift-XRT Team Refined Analysis
  67. GRB 080319B, Swift-BAT refined analysis
  68. GRB080319B: Prompt PROMPT Detections
  69. GRB 080319C: Swift-XRT Team Refined Analysis
  70. GRB 080319B: Swift-XRT Team Refined Analysis
  71. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  72. GRB 080319C: AGILE-MCAL observation of the prompt emission
  73. GRB 080319B: Hobby-Eberly Telescope Spectroscopy
  74. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  75. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  76. GRB 080319B: TORTORA synchronous observation
  77. VLT/UVES redshift of GRB 080319B from FeII fine-structure lines
  78. GRB 080319A/B/C: INTEGRAL SPI-ACS light curves available
  79. GRB 080319A, Swift-BAT refined analysis
  80. GRB 080319B: REM early data
  81. GRB 080319b light curve by Pi-of-the-Sky
  82. VLT/UVES redshift of GRB 080319B
  83. GRB 080319C: Early Super-LOTIS Observations
  84. GRB 080319A: REM observations
  85. GRB 080319B: Change in power law decay index
  86. GRB 080319B: Gemini-South Spectroscopy
  87. GRB 080319A: optical observations at the NOT
  88. GRB0 080319B : LOAO optical observation
  89. GRB 080319B: Super-LOTIS Detection of a Bright OT
  90. GRB 080319B: REM observations
  91. GRB080319A: P60 Optical Afterglow Observations
  92. GRB 080319B: UVOT Position
  93. GRB080310, LBT and MDM photometry
  94. GRB080315: Bok Optical Observations
  95. Swift/UVOT observations of GRB 080315
  96. Swift trigger 306323: Swift-BAT/XRT refined analysis
  97. GRB 080315: Optical observations
  98. GRB080310 : Lulin Optical observations
  99. GRB080310, unusual slow decay in the optical
  100. GRB 080310: GAO 150cm telescope Optical Observation

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