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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"

41192 results found.

  1. GRB030429: Optical Observations
  2. GRB030501: TAROT candidate afterglow present in archival images
  3. GRB 030501: TAROT possible candidate counterpart
  4. IPN triangulation of GRB030501 (IBIS event; annulus)
  5. GRB 030429: confirmation of afterglow candidate
  6. GRB030429, possible optical counterpart
  7. GRB030501 localized by INTEGRAL
  8. GRB030425: CrAO optical observation
  9. GRB 030329 Oprical observations in Rozhen observatory
  10. GRB 030324: Radio Observations
  11. GRB030329 observed as a sudden ionospheric disturbance (SID)
  12. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  13. IPN triangulation of GRB030425 (single error box)
  14. GRB030329, SPM optical observations (Correction)
  15. GRB030329, SPM optical observations
  16. GRB 030329, the review of the sky area in plate archive (1950-1998)
  17. GRB 030329: Spectral Evolution of SN 2003dh
  18. Optical Observations of GRB 030418 with Magellan
  19. GRB 030329: optical spectropolarimetry at VLT
  20. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  21. GRB030329: optical polarization
  22. IPN triangulation of GRB030422 (two large error boxes)
  23. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  24. GRB030329, optical observation
  25. MASTER:optical observations GRB030418
  26. MASTER:optical observations probable GRB030414
  27. GRB030329: 444 AAVSO Measurements
  28. MASTER:optical observations GRB030416
  29. ROTSE-III prompt optical detections of GRB 030418
  30. GRB030418: Upper limits from recent and historical observations.
  31. GRB030418: Kiso near infrared observations
  32. GRB 030418: Optical afterglow
  33. GRB 030418: Finder for afterglow candidate
  34. GRB 030418: Optical afterglow candidate
  35. GRB 030329 OT position
  36. GRB030329: Optical Observations
  37. OT GRB 030329: early UBVRcIc spectral evolution
  38. GRB030329, UBVRI polarimetry, R-polarization
  39. GRB 030329: SARA Optical Observations
  40. OT GRB 030329: early spectrum
  41. GRB030329: VR Photometry at TNG
  42. GRB030324: Candidate Optical Afterglow (Erratum)
  43. GRB030324: Candidate Optical Afterglow
  44. GRB 030413: Optical Observations
  45. GRB 030329 Rc observations
  46. Superluminal motion in GRB 030329 (Correction)
  47. Superluminal motion in GRB 030329
  48. GRB 030329 and SN 2003dh
  49. GRB030329, optical position
  50. GRB 030329 VLBA Observations
  51. IPN triangulation of GRB030406 (small error box)
  52. GRB 030329: BVRI photometry at Asiago
  53. GRB 030329, light curve flattens
  54. GRB 030329: VLT V-band photometry
  55. GRB 030329: Supernova Confirmed
  56. GRB030329: RTT150 optical observations
  57. GRB030329: Near Infrared Observations at Gunma
  58. GRB030329: HET spectroscopic monitoring
  59. Kiso observation of the GRB030329 at April 6
  60. GRB 030329, color evolution
  61. GRB030328, UBVRcIc field photometry
  62. GRB030329: Optical observcations
  63. GRB030329: BV photographic observations
  64. GRB 030329 Optical observations
  65. GRB 030329, color evolution
  66. GRB 030329: possible color change
  67. GRB030329: RTT150 optical observations
  68. GRB 030329: Supernova Spectrum Emerging
  69. GRB030329: Kiso B and R band observations
  70. GRB030329: RTT150 optical observation
  71. GRB030328: R upper limit after 6 hours by MASTER
  72. GRB 030329: BV photographic observations
  73. GRB 030329: SARA Optical Observations
  74. GRB 030329: SARA Optical Observations
  75. GRB 030329, BVRI photometry
  76. GRB030329: Optical observations
  77. SDSS 0.5m PT observations of GRB030329 (correction)
  78. SDSS 0.5m PT observations of GRB030329
  79. GRB 030329, Optical observations
  80. GRB030329, cessation of fading
  81. GRB030329: final R-band light curve by MASTER
  82. GRB030329 - more 15 GHz radio data
  83. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  84. GRB 030329: Sub-millimeter detection
  85. GRB 030329: SARA Optical Observations
  86. GRB 030329: SARA Optical Observations
  87. OT GRB light curves and SN predictions
  88. GRB030329, optical observation
  89. GRB030329, optical observation
  90. GRB030329, new UBVRcIc field photometry
  91. GRB 030329, light curve and SN prediction
  92. GRB030329: optical observations at Tokyo Tech
  93. GRB 030329: optical observations
  94. GRB030329: multiple re-brightening phases
  95. GRB 030329, BRI photometry
  96. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  97. GRB 030329 , SPM optical observations
  98. GRB030329: Optical observations at Teramo
  99. GRB 030329: Radio observations at GMRT
  100. GRB030329: more 15GHz observations

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