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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"

42291 results found.

  1. GRB030323: Upper limits from recent and historical observations.
  2. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  3. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  4. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  5. VLT/FORS2 spectra of GRB 030323
  6. GRB030323, ROTSE-III detection of possible optical counterpart
  7. GRB030323, optical observations
  8. GRB030324, BVRcIc field photometry
  9. GRB030323, possible optical counterpart
  10. GRB030323, BVRcIc field calibration
  11. GRB 030324 optical observations
  12. GRB 030320: Optical Observations
  13. GRB 030324, optical observations
  14. IPN triangulation of GRB030320
  15. GRB030226, addendum to GCN 1892
  16. IPN upper limit to a GRB associated with SN2003L
  17. GRB 030227: Optical limit at RIKEN
  18. GRB 030226 Optical observations
  19. GRB030226: Optical observations at Asiago
  20. IPN triangulation of GRB030306 (single small error box)
  21. IPN triangulation of GRB030306 (intense; annulus only so far)
  22. GRB 030226: Optical observations
  23. GRB030226: Analysis of Chandra data
  24. GRB 030227: Optical observations
  25. GRB030226, BVRc observations
  26. Chandra detection of the X-ray afterglow of GRB 030226
  27. GRB 030226, further optical/NIR imaging
  28. GRB030227, optical observations
  29. GRB 030226: Ic Observations
  30. GRB030227: Kiso optical upper limit
  31. GRB030227, BVRcIc field photometry
  32. GRB030226, BVRcIc field calibration
  33. GRB 030227 optical afterglow
  34. GRB 030228, optical observations
  35. GRB 030226: Steep Decline
  36. GRB 030227: Confirmed Optical Afterglow (S1-A)
  37. GRB 030226: R band polarimetric observations
  38. GRB 030226: Optical observations
  39. GRB 030227: fading of candidate optical afterglow 'S1-A'
  40. GRB030227:Optical observations
  41. GRB 20030226: Upper limits from recent and historical observations
  42. GRB 030227, possible optical counterpart of XMM-Newton source
  43. GRB030227 - faint tentative OT candidate
  44. GRB 030226, optical observations
  45. XMM-Newton observation of GRB030227
  46. GRB030227: Kiso optical observations
  47. GRB 030227: Kyoto optical observation
  48. GRB 030226, optical light curve
  49. GRB 030226 spectroscopy
  50. GRB030227: refined INTEGRAL position
  51. GRB030227 localized by INTEGRAL
  52. Possible break in the GRB 030226 light curve
  53. GRB 030226 : Predicted light curve
  54. GRB030226: optical observation
  55. GRB 030226: Confirmed decay index
  56. GRB030226: ESI spectroscopy
  57. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  58. GRB 030226 simultaneous optical observations
  59. Two absorption systems in GRB 030226
  60. GRB 030226, optical observations
  61. GRB030226: optical observations and refined redshift
  62. GRB030226: Optical decay index
  63. GRB 030226 Optical Spectra and R,I,z' Imaging
  64. GRB 030226, optical observations
  65. GRB 030226: Optical afterglow
  66. GRB030226: Candidate optical afterglow
  67. GRB 030217: Optical Observations at 4, 5, and 6 Days
  68. GRB: Non-Referencing of GCN Circulars.
  69. GRB030217: optical observations
  70. IPN triangulation of GRB030217 (small error box)
  71. IPN triangulation of GRB030215A and GRB030215B (annuli)
  72. GRB030115, WSRT radio observations - correction to GCN 1864
  73. GRB 030131: marginal optical detection
  74. GRB030115, WSRT radio observations
  75. IPN triangulation of GRB030206 (annulus)
  76. GRB 030204: Optical Observations
  77. GRB030204 field photometry
  78. GRB020819: Kiso R and I band observations
  79. GRB030131: Candidate Optical Afterglow
  80. GRB 030115: Optical Observations
  81. GRB 030204, optical observations
  82. IPN triangulation of GRB030202 (annulus)
  83. GRB 030131, optical observations
  84. GRB030131: Kiso optical limit for corrected position
  85. GRB030131: Optical limits for corrected position
  86. GRB 030131: afterglow candidate
  87. GRB 030115, late-time optical observations
  88. GRB030131: corrected INTEGRAL position
  89. Type Ic SN2003L (SN/GRB?), optical spectrum
  90. GRB030131: Kiso Observations
  91. GRB 020819: Host galaxy at Radio Position
  92. IPN triangulation of GRB030131 - CORRECTION
  93. GRB 020819: afterglow candidate
  94. IPN triangulation of GRB030131
  95. GRB030131: Optical limit
  96. GRB 030131 optical observations
  97. GRB030131: refined position
  98. GRB 030131 optical observations
  99. A long GRB detected by INTEGRAL
  100. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m

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