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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"

42279 results found.

  1. GRB 030324, optical observations
  2. IPN triangulation of GRB030320
  3. GRB030226, addendum to GCN 1892
  4. IPN upper limit to a GRB associated with SN2003L
  5. GRB 030227: Optical limit at RIKEN
  6. GRB 030226 Optical observations
  7. GRB030226: Optical observations at Asiago
  8. IPN triangulation of GRB030306 (single small error box)
  9. IPN triangulation of GRB030306 (intense; annulus only so far)
  10. GRB 030226: Optical observations
  11. GRB030226: Analysis of Chandra data
  12. GRB 030227: Optical observations
  13. GRB030226, BVRc observations
  14. Chandra detection of the X-ray afterglow of GRB 030226
  15. GRB 030226, further optical/NIR imaging
  16. GRB030227, optical observations
  17. GRB 030226: Ic Observations
  18. GRB030227: Kiso optical upper limit
  19. GRB030227, BVRcIc field photometry
  20. GRB030226, BVRcIc field calibration
  21. GRB 030227 optical afterglow
  22. GRB 030228, optical observations
  23. GRB 030226: Steep Decline
  24. GRB 030227: Confirmed Optical Afterglow (S1-A)
  25. GRB 030226: R band polarimetric observations
  26. GRB 030226: Optical observations
  27. GRB 030227: fading of candidate optical afterglow 'S1-A'
  28. GRB030227:Optical observations
  29. GRB 20030226: Upper limits from recent and historical observations
  30. GRB 030227, possible optical counterpart of XMM-Newton source
  31. GRB030227 - faint tentative OT candidate
  32. GRB 030226, optical observations
  33. XMM-Newton observation of GRB030227
  34. GRB030227: Kiso optical observations
  35. GRB 030227: Kyoto optical observation
  36. GRB 030226, optical light curve
  37. GRB 030226 spectroscopy
  38. GRB030227: refined INTEGRAL position
  39. GRB030227 localized by INTEGRAL
  40. Possible break in the GRB 030226 light curve
  41. GRB 030226 : Predicted light curve
  42. GRB030226: optical observation
  43. GRB 030226: Confirmed decay index
  44. GRB030226: ESI spectroscopy
  45. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  46. GRB 030226 simultaneous optical observations
  47. Two absorption systems in GRB 030226
  48. GRB 030226, optical observations
  49. GRB030226: optical observations and refined redshift
  50. GRB030226: Optical decay index
  51. GRB 030226 Optical Spectra and R,I,z' Imaging
  52. GRB 030226, optical observations
  53. GRB 030226: Optical afterglow
  54. GRB030226: Candidate optical afterglow
  55. GRB 030217: Optical Observations at 4, 5, and 6 Days
  56. GRB: Non-Referencing of GCN Circulars.
  57. GRB030217: optical observations
  58. IPN triangulation of GRB030217 (small error box)
  59. IPN triangulation of GRB030215A and GRB030215B (annuli)
  60. GRB030115, WSRT radio observations - correction to GCN 1864
  61. GRB 030131: marginal optical detection
  62. GRB030115, WSRT radio observations
  63. IPN triangulation of GRB030206 (annulus)
  64. GRB 030204: Optical Observations
  65. GRB030204 field photometry
  66. GRB020819: Kiso R and I band observations
  67. GRB030131: Candidate Optical Afterglow
  68. GRB 030115: Optical Observations
  69. GRB 030204, optical observations
  70. IPN triangulation of GRB030202 (annulus)
  71. GRB 030131, optical observations
  72. GRB030131: Kiso optical limit for corrected position
  73. GRB030131: Optical limits for corrected position
  74. GRB 030131: afterglow candidate
  75. GRB 030115, late-time optical observations
  76. GRB030131: corrected INTEGRAL position
  77. Type Ic SN2003L (SN/GRB?), optical spectrum
  78. GRB030131: Kiso Observations
  79. GRB 020819: Host galaxy at Radio Position
  80. IPN triangulation of GRB030131 - CORRECTION
  81. GRB 020819: afterglow candidate
  82. IPN triangulation of GRB030131
  83. GRB030131: Optical limit
  84. GRB 030131 optical observations
  85. GRB030131: refined position
  86. GRB 030131 optical observations
  87. A long GRB detected by INTEGRAL
  88. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  89. Type Ic SN2003L (SN/GRB?) Radio Observations
  90. GRB030115 submm upper limit
  91. GRB 030115: Further IR observations with IRSF/SIRIUS
  92. Publicizing GRB Discoveries - A Message from NASA HQ
  93. GRB 030115: Radio detection of IR candidate
  94. GRB 030115, simultaneous observations by BOOTES-1
  95. GRB 030115: IR observations with IRSF/SIRIUS
  96. GRB030115: R-band counterpart of IR candidate
  97. GRB030115, afterglow candidate
  98. GRB 021211: R-band observations at late-time
  99. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  100. IPN triangulation of GRB030115B (small error box)

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