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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"

32552 results found.

  1. GRB 030329: OT B and R photometry, decline rate
  2. GRB030329: Upper limits from recent and historical observations.
  3. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  4. GRB 030329: Optical Afterglow Observations
  5. GRB 030329: precise position from Kyoto images
  6. GRB 030328 Optical Observations
  7. GRB030328: Decay index
  8. GRB 030328: Optical observations
  9. GRB 030328: optical observations
  10. GRB 030329: Optical afterglow fading
  11. GRB 030328: OT photometry
  12. GRB030328: optical spectroscopy at TNG
  13. GRB030328: optical photometry at the TNG
  14. VLT spectra of GRB 030328
  15. GRB 030328, optical spectroscopy
  16. GRB 030328, optical observations
  17. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  18. GRB 030328: Optical observations
  19. GRB 030328: Finding chart
  20. GRB030323 optical observations
  21. GRB030131, BVRcIc field photometry
  22. IPN triangulation of GRB030325 (final analysis)
  23. GRB030323: Detection on 2003/03/24
  24. GRB 030323: SARA Optical Observations
  25. IPN triangulation of GRB030325 (single small error box)
  26. GRB030324, optical observations
  27. GRB030324, optical observations
  28. GRB 030324: TAROT optical observations
  29. GRB030323: V, R, I photometry
  30. GRB 030324 (HETE #2641): Optical observations
  31. GRB030324, Optical Observations
  32. GRB030323: Upper limits from recent and historical observations.
  33. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  34. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  35. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  36. VLT/FORS2 spectra of GRB 030323
  37. GRB030323, ROTSE-III detection of possible optical counterpart
  38. GRB030323, optical observations
  39. GRB030323, possible optical counterpart
  40. GRB 030324 optical observations
  41. GRB 030320: Optical Observations
  42. IPN triangulation of GRB030320 (small error box)
  43. IPN triangulation of GRB030320
  44. GRB030226, addendum to GCN 1892
  45. IPN upper limit to a GRB associated with SN2003L
  46. GRB 030227: Optical limit at RIKEN
  47. GRB 030226 Optical observations
  48. IPN triangulation of GRB030306 (single small error box - REVISED)
  49. GRB030226: Optical observations at Asiago
  50. IPN triangulation of GRB030306 (two small error boxes)
  51. GRB 030226: Optical observations
  52. GRB030226: Analysis of Chandra data
  53. GRB 030227: Optical observations
  54. GRB030226, BVRc observations
  55. Chandra detection of the X-ray afterglow of GRB 030226
  56. GRB 030226, further optical/NIR imaging
  57. GRB 030226: Ic Observations
  58. GRB030227: Kiso optical upper limit
  59. GRB030227, BVRcIc field photometry
  60. GRB030226, BVRcIc field calibration
  61. GRB 030227 optical afterglow
  62. GRB 030226: Steep Decline
  63. GRB 030227: Confirmed Optical Afterglow (S1-A)
  64. GRB 030226: R band polarimetric observations
  65. GRB 030226: Optical observations
  66. GRB 030227: fading of candidate optical afterglow 'S1-A'
  67. GRB030227:Optical observations
  68. GRB 20030226: Upper limits from recent and historical observations
  69. GRB 030227, possible optical counterpart of XMM-Newton source
  70. GRB030227 - faint tentative OT candidate
  71. GRB 030226, optical observations
  72. XMM-Newton observation of GRB030227
  73. GRB 030227: Kyoto optical observation
  74. GRB 030226, optical light curve
  75. GRB 030226 spectroscopy
  76. Possible break in the GRB 030226 light curve
  77. GRB030226: optical observation
  78. GRB 030226: Confirmed decay index
  79. GRB030226: ESI spectroscopy
  80. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  81. Two absorption systems in GRB 030226
  82. GRB 030226, optical observations
  83. GRB030226: optical observations and refined redshift
  84. GRB 030226, optical observations
  85. GRB 030226: Optical afterglow
  86. GRB 030217: Optical Observations at 4, 5, and 6 Days
  87. GRB: Non-Referencing of GCN Circulars.
  88. GRB030217: optical observations
  89. IPN triangulation of GRB030217 (small error box)
  90. GRB030115, WSRT radio observations - correction to GCN 1864
  91. GRB 030131: marginal optical detection
  92. GCN/INTEGRAL Mistake Fixed
  93. GRB 030204: Optical Observations
  94. GRB030204 field photometry
  95. GRB020819: Kiso R and I band observations
  96. GRB 030204: Correction to GCN 1856
  97. GRB030131: Candidate Optical Afterglow
  98. GRB 030115: Optical Observations
  99. GRB 030204, optical observations
  100. GRB 030131, optical observations

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