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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"

32683 results found.

  1. GRB 030329: SARA Optical Observations
  2. GRB 030324, optical search
  3. GRB030329 - near contemporaneous optical limits from CONCAM
  4. GRB030329: R and B observations
  5. GRB 030329, optical observations
  6. GRB030329: Optical observations
  7. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  8. GRB030329a: detection by Konus-Wind
  9. GRB 030329: Light curve observed during the change of its slope.
  10. GRB030329, BVRcIc field photometry
  11. GRB030329, SPM optical observations
  12. GRB 030329: Optical Decay
  13. Redshift of GRB 030329
  14. GRB030329: ROTSE network observes steepening of decay curve
  15. GRB 030329, optical photometry
  16. GRB 030329: Optical decay and synthesis
  17. GRB030329 optical observations
  18. GRB030329: optical spectroscopy with the TNG
  19. GRB 030329: Radio Observations
  20. GRB 030329, optical spectroscopy
  21. GRB 030329: still bright
  22. GRB 030329: Optical pre-Imaging
  23. GRB 030329: visual observations
  24. GRB 030329: Upper limit from 5.6 hours before trigger
  25. GRB030328: R optical observation
  26. GRB030328: X-ray Afterglow Observed with Chandra
  27. GRB 030323: Gemini South VRI obsevations.
  28. GRB030329: Optical observations
  29. GRB030329:optical observations by MASTER
  30. GRB 030329: optical observations
  31. GRB 030329, R-band observations
  32. GRB 030329: OT B and R photometry, decline rate
  33. GRB030329: Upper limits from recent and historical observations.
  34. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  35. GRB 030329: Optical Afterglow Observations
  36. GRB 030329: precise position from Kyoto images
  37. GRB 030328 Optical Observations
  38. GRB030328: Decay index
  39. GRB 030328: Optical observations
  40. GRB 030328: optical observations
  41. GRB 030329: Optical afterglow fading
  42. GRB 030328: OT photometry
  43. GRB030328: optical spectroscopy at TNG
  44. GRB030328: optical photometry at the TNG
  45. VLT spectra of GRB 030328
  46. GRB 030328, optical spectroscopy
  47. GRB 030328, optical observations
  48. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  49. GRB 030328: Optical observations
  50. GRB 030328: Finding chart
  51. GRB030323 optical observations
  52. GRB030131, BVRcIc field photometry
  53. IPN triangulation of GRB030325 (final analysis)
  54. GRB030323: Detection on 2003/03/24
  55. GRB 030323: SARA Optical Observations
  56. IPN triangulation of GRB030325 (single small error box)
  57. GRB030324, optical observations
  58. GRB030324, optical observations
  59. GRB 030324: TAROT optical observations
  60. GRB030323: V, R, I photometry
  61. GRB 030324 (HETE #2641): Optical observations
  62. GRB030324, Optical Observations
  63. GRB030323: Upper limits from recent and historical observations.
  64. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  65. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  66. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  67. VLT/FORS2 spectra of GRB 030323
  68. GRB030323, ROTSE-III detection of possible optical counterpart
  69. GRB030323, optical observations
  70. GRB030323, possible optical counterpart
  71. GRB 030324 optical observations
  72. GRB 030320: Optical Observations
  73. IPN triangulation of GRB030320 (small error box)
  74. IPN triangulation of GRB030320
  75. GRB030226, addendum to GCN 1892
  76. IPN upper limit to a GRB associated with SN2003L
  77. GRB 030227: Optical limit at RIKEN
  78. GRB 030226 Optical observations
  79. IPN triangulation of GRB030306 (single small error box - REVISED)
  80. GRB030226: Optical observations at Asiago
  81. IPN triangulation of GRB030306 (two small error boxes)
  82. GRB 030226: Optical observations
  83. GRB030226: Analysis of Chandra data
  84. GRB 030227: Optical observations
  85. GRB030226, BVRc observations
  86. Chandra detection of the X-ray afterglow of GRB 030226
  87. GRB 030226, further optical/NIR imaging
  88. GRB 030226: Ic Observations
  89. GRB030227: Kiso optical upper limit
  90. GRB030227, BVRcIc field photometry
  91. GRB030226, BVRcIc field calibration
  92. GRB 030227 optical afterglow
  93. GRB 030226: Steep Decline
  94. GRB 030227: Confirmed Optical Afterglow (S1-A)
  95. GRB 030226: R band polarimetric observations
  96. GRB 030226: Optical observations
  97. GRB 030227: fading of candidate optical afterglow 'S1-A'
  98. GRB030227:Optical observations
  99. GRB 20030226: Upper limits from recent and historical observations
  100. GRB 030227, possible optical counterpart of XMM-Newton source

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