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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

36077 results found.

  1. GRB030329: RTT150 optical observations and upper limit for a host
  2. GRB 030429: Radio Observations
  3. GRB 030429: redshift from VLT spectroscopy
  4. GRB 030429: IR photometry with IRSF/SIRIUS
  5. GRB030501B triangulation (single error box)
  6. GRB 030329 Optical Observations
  7. GRB 030329, BVRI photometry
  8. GRB 030501: TAROT possible candidate counterpart
  9. IPN triangulation of GRB030501 (IBIS event; annulus)
  10. IPN triangulation of GRB030501B (annulus)
  11. GRB 030429: confirmation of afterglow candidate
  12. GRB030429, possible optical counterpart
  13. GRB030501 localized by INTEGRAL
  14. GRB030425: CrAO optical observation
  15. IPN triangulation of GRB030429 (annulus)
  16. IPN triangulation of GRB030428 (two large error boxes)
  17. GRB 030329 Oprical observations in Rozhen observatory
  18. GRB 030429: ROTSE-III observations
  19. GRB 030324: Radio Observations
  20. GRB030329 observed as a sudden ionospheric disturbance (SID)
  21. IPN triangulation of GRB030426 (annulus)
  22. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  23. IPN triangulation of GRB030425 (single error box)
  24. GRB 030329, the review of the sky area in plate archive (1950-1998)
  25. GRB 030329: Spectral Evolution of SN 2003dh
  26. Optical Observations of GRB 030418 with Magellan
  27. GRB 030329: optical spectropolarimetry at VLT
  28. IPN triangulation of GRB030422C (annulus)
  29. IPN triangulation of GRB030422B (annulus)
  30. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  31. GRB030329: optical polarization
  32. IPN triangulation of GRB030422 (two large error boxes)
  33. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  34. IPN triangulation of GRB030421 (annulus)
  35. MASTER:optical observations GRB030418
  36. MASTER:optical observations probable GRB030414
  37. GRB030329: 444 AAVSO Measurements
  38. IPN triangulation of GRB030419 (annulus)
  39. MASTER:optical observations GRB030416
  40. ROTSE-III prompt optical detections of GRB 030418
  41. GRB030418: Upper limits from recent and historical observations.
  42. GRB030418: Kiso near infrared observations
  43. GRB 030418: Optical afterglow
  44. GRB 030418: Finder for afterglow candidate
  45. GRB 030418: Optical afterglow candidate
  46. GRB 030329 OT position
  47. OT GRB 030329: early UBVRcIc spectral evolution
  48. GRB030329, UBVRI polarimetry, R-polarization
  49. GRB 030329: SARA Optical Observations
  50. OT GRB 030329: early spectrum
  51. GRB030329: VR Photometry at TNG
  52. GRB030324: Candidate Optical Afterglow (Erratum)
  53. GRB030324: Candidate Optical Afterglow
  54. IPN triangulation of GRB030414 (small error box)
  55. GRB 030413: Optical Observations
  56. GRB 030329 Rc observations
  57. IPN triangulation of GRB030413 (small error box)
  58. IPN triangulation of GRB030410 (annulus)
  59. Superluminal motion in GRB 030329 (Correction)
  60. Superluminal motion in GRB 030329
  61. GRB 030329 and SN 2003dh
  62. GRB030329, optical position
  63. GRB 030329 VLBA Observations
  64. IPN triangulation of GRB030406 (small error box)
  65. IPN triangulation of GRB050403 (small error box)
  66. IPN triangulation of GRB030403 (annulus)
  67. GRB 030329: BVRI photometry at Asiago
  68. GRB 030329, light curve flattens
  69. GRB 030329: VLT V-band photometry
  70. If the SN/GRB connection confirmed
  71. GRB 030329: Supernova Confirmed
  72. GRB030329: RTT150 optical observations
  73. GRB030329: Near Infrared Observations at Gunma
  74. GRB030329: HET spectroscopic monitoring
  75. Kiso observation of the GRB030329 at April 6
  76. GRB 030329, color evolution
  77. GRB030328, UBVRcIc field photometry
  78. GRB 030329 Optical observations
  79. GRB 030329, color evolution
  80. GRB 030329: possible color change
  81. GRB030329: RTT150 optical observations
  82. GRB 030329: Supernova Spectrum Emerging
  83. GRB030329: Kiso B and R band observations
  84. GRB030329: RTT150 optical observation
  85. GRB030329: More AAVSO VR obs
  86. GRB030328: R upper limit after 6 hours by MASTER
  87. GRB 030329: BV photographic observations
  88. GRB 030329: SARA Optical Observations
  89. GRB 030329: SARA Optical Observations
  90. GRB030329, fading resumes
  91. GRB 030329, BVRI photometry
  92. SDSS 0.5m PT observations of GRB030329 (correction)
  93. SDSS 0.5m PT observations of GRB030329
  94. GRB 030329, Optical observations
  95. GRB 030329, nearby galaxies
  96. GRB030329, cessation of fading
  97. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  98. GRB 030329: Sub-millimeter detection
  99. GRB 030329: SARA Optical Observations
  100. GRB 030329: SARA Optical Observations

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