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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"

28228 results found.

  1. GRB 030329: Observations with ANDICAM
  2. GRB030329: further optical photometry and evidence for a light curve discontinuity
  3. triangulation of GRB 030331 (single error box)
  4. GRB 030329: optical observations
  5. Photometry of GRB030329 - Constant OT Magnitude
  6. GRB030329 - OT brightens
  7. GRB 030329, optical photometry
  8. GRB 030324: Optical and NIR Observations
  9. GRB030329: R band light curve by MASTER
  10. GRB030329 - Light curve flattening
  11. GRB 030324, optical search
  12. GRB 030329, optical observations
  13. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  14. GRB030329a: detection by Konus-Wind
  15. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  16. GRB030329, BVRcIc field photometry
  17. GRB030329, SPM optical observations
  18. GRB 030329: Optical decay and synthesis
  19. GRB030329 optical observations
  20. GRB 030329: Optical pre-Imaging
  21. GRB 030329: Upper limit from 5.6 hours before trigger
  22. GRB030328: X-ray Afterglow Observed with Chandra
  23. GRB 030329, R-band observations
  24. GRB 030329: OT B and R photometry, decline rate
  25. GRB030329: Upper limits from recent and historical observations.
  26. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  27. GRB 030329: Optical Afterglow Observations
  28. GRB 030328: optical observations
  29. GRB 030329: Optical afterglow fading
  30. GRB 030328: OT photometry
  31. GRB030328: optical spectroscopy at TNG
  32. GRB030328: optical photometry at the TNG
  33. VLT spectra of GRB 030328
  34. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  35. GRB 030328: Optical observations
  36. GRB030324 optical observation
  37. GRB030131, BVRcIc field photometry
  38. Possible GRB030323 localized by INTEGRAL
  39. GRB030323: Detection on 2003/03/24
  40. IPN triangulation of GRB030326 (single small error box)
  41. IPN triangulation of GRB030325 (two small error boxes)
  42. GRB030323: V, R, I photometry
  43. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  44. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  45. VLT/FORS2 spectra of GRB 030323
  46. GRB030323, optical observations
  47. GRB030324, BVRcIc field photometry
  48. GRB030323, BVRcIc field calibration
  49. IPN triangulation of GRB030320 (small error box)
  50. Possible GRB 030320 localized by INTEGRAL
  51. IPN triangulation of GRB030306 (single small error box - REVISED)
  52. IPN triangulation of GRB030306 (single small error box)
  53. IPN triangulation of GRB030306 (two small error boxes)
  54. GRB030226, BVRc observations
  55. Chandra detection of the X-ray afterglow of GRB 030226
  56. GRB030227: Kiso optical upper limit
  57. GRB030227, BVRcIc field photometry
  58. GRB030226, BVRcIc field calibration
  59. GRB 030228, optical observations
  60. GRB 030227: Confirmed Optical Afterglow (S1-A)
  61. GRB 030227: fading of candidate optical afterglow 'S1-A'
  62. GRB030227:Optical observations
  63. GRB 030227, possible optical counterpart of XMM-Newton source
  64. GRB030227 - faint tentative OT candidate
  65. GRB 030226, optical observations
  66. XMM-Newton observation of GRB030227
  67. GRB030227: Kiso optical observations
  68. GRB 030227: Kyoto optical observation
  69. GRB 030226, optical light curve
  70. GRB030227 localized by INTEGRAL
  71. GRB 030226 : Predicted light curve
  72. GRB030226: ESI spectroscopy
  73. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  74. GRB 030226 simultaneous optical observations
  75. GRB 030226, optical observations
  76. GRB030226: Optical decay index
  77. GRB 030226 Optical Spectra and R,I,z' Imaging
  78. GRB: Non-Referencing of GCN Circulars.
  79. IPN triangulation of GRB030217 (small error box)
  80. GRB 030131: marginal optical detection
  81. GRB 030204: Optical Observations
  82. GRB030204 field photometry
  83. GRB020819: Kiso R and I band observations
  84. GRB030131: Candidate Optical Afterglow
  85. IPN triangulation of GRB030204 (small error box)
  86. GRB 030131, optical observations
  87. GRB 030131: afterglow candidate
  88. GRB 030115, late-time optical observations
  89. GRB030131: corrected INTEGRAL position
  90. GRB 020819: Host galaxy at Radio Position
  91. IPN triangulation of GRB030131
  92. GRB 030131 optical observations
  93. GRB 030131 optical observations
  94. A long GRB detected by INTEGRAL
  95. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  96. GRB 030115, simultaneous observations by BOOTES-1
  97. GRB 030115: IR observations with IRSF/SIRIUS
  98. IPN triangulation of GRB030115C (large error box)
  99. GRB030115, afterglow candidate
  100. GRB 021211: R-band observations at late-time

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