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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"

22059 results found.

  1. GRB 030329 Optical Observations
  2. GRB030429: Optical Observations
  3. GRB030501: TAROT candidate afterglow present in archival images
  4. GRB 030501: TAROT possible candidate counterpart
  5. GRB 030429: confirmation of afterglow candidate
  6. GRB030429, possible optical counterpart
  7. GRB 030329 Oprical observations in Rozhen observatory
  8. GRB 030429: ROTSE-III observations
  9. GRB 030324: Radio Observations
  10. GRB030329 observed as a sudden ionospheric disturbance (SID)
  11. GRB030329, SPM optical observations (Correction)
  12. GRB030329, SPM optical observations
  13. GRB 030329, the review of the sky area in plate archive (1950-1998)
  14. Optical Observations of GRB 030418 with Magellan
  15. GRB 030329: optical spectropolarimetry at VLT
  16. GRB030329: optical polarization
  17. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  18. MASTER:optical observations GRB030418
  19. MASTER:optical observations probable GRB030414
  20. GRB030329: 444 AAVSO Measurements
  21. MASTER:optical observations GRB030416
  22. ROTSE-III prompt optical detections of GRB 030418
  23. GRB030418: Upper limits from recent and historical observations.
  24. GRB030418: Kiso near infrared observations
  25. GRB 030418: Optical afterglow
  26. GRB 030418: Optical afterglow candidate
  27. GRB030329: Optical Observations
  28. OT GRB 030329: early UBVRcIc spectral evolution
  29. GRB030329, UBVRI polarimetry, R-polarization
  30. GRB 030329: SARA Optical Observations
  31. OT GRB 030329: early spectrum
  32. GRB030329: VR Photometry at TNG
  33. GRB 030413: Optical Observations
  34. GRB 030329 Rc observations
  35. GRB 030329 VLBA Observations
  36. GRB 030329: VLT V-band photometry
  37. GRB030329: RTT150 optical observations
  38. GRB030329: Near Infrared Observations at Gunma
  39. Kiso observation of the GRB030329 at April 6
  40. GRB030329: Optical observcations
  41. GRB030329: BV photographic observations
  42. GRB 030329 Optical observations
  43. GRB030329: RTT150 optical observations
  44. GRB 030329: Supernova Spectrum Emerging
  45. GRB030329: Kiso B and R band observations
  46. GRB030329: RTT150 optical observation
  47. GRB030329: More AAVSO VR obs
  48. GRB030328: R upper limit after 6 hours by MASTER
  49. GRB 030329: BV photographic observations
  50. GRB 030329: SARA Optical Observations
  51. GRB 030329: SARA Optical Observations
  52. GRB030329: Optical observations
  53. SDSS 0.5m PT observations of GRB030329 (correction)
  54. SDSS 0.5m PT observations of GRB030329
  55. GRB 030329, Optical observations
  56. GRB030329: final R-band light curve by MASTER
  57. GRB030329 - more 15 GHz radio data
  58. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  59. GRB 030329: Sub-millimeter detection
  60. GRB 030329: SARA Optical Observations
  61. GRB 030329: SARA Optical Observations
  62. GRB030329, new UBVRcIc field photometry
  63. GRB030329: optical observations at Tokyo Tech
  64. GRB 030329: optical observations
  65. GRB 030329, BRI photometry
  66. GRB 030329 , SPM optical observations
  67. GRB030329: Optical observations at Teramo
  68. GRB 030329: Radio observations at GMRT
  69. GRB030329: more 15GHz observations
  70. Further AAVSO V,B,R observations of GRB030329
  71. GRB 030329: Additional Mt. Laguna Optical Observations
  72. GRB 030329: SARA Optical Observations
  73. GRB 030329: Observations with ANDICAM
  74. GRB030329: Optical observations
  75. GRB030329: further optical photometry and evidence for a light curve discontinuity
  76. GRB 030329: Correction to GCN 2056
  77. GRB 030329: KAIT optical photometry
  78. GRB030329 Further RBO Optical Observations
  79. GRB 030329: SARA Optical Observations
  80. AAVSO V & R observations of GRB030329
  81. GRB 030329: optical observations
  82. GRB 030329: beginning of the new fading phase in optical band
  83. GRB 030329: optical photometry
  84. GRB030329: Optical observations
  85. Photometry of GRB030329 - Constant OT Magnitude
  86. GRB 030329, R-band observations
  87. GRB 030329: further optical observations
  88. GRB030329 - OT brightens
  89. GRB 030329: OT observations at Kanazawa
  90. GRB 030329 RBO V Optical Observations
  91. GRB030329: Near Infrared Observations
  92. GRB 030324: Optical and NIR Observations
  93. GRB030329: R band light curve by MASTER
  94. GRB030329 - Light curve flattening
  95. GRB 030329: SARA Optical Observations
  96. GRB030329 - near contemporaneous optical limits from CONCAM
  97. GRB030329: R and B observations
  98. GRB 030329, optical observations
  99. GRB030329: Optical observations
  100. GRB030328: X-ray Fading and Spectrum Measured with Chandra

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