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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"

28117 results found.

  1. GRB 030329, optical observations
  2. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  3. GRB030329a: detection by Konus-Wind
  4. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  5. GRB030329, BVRcIc field photometry
  6. GRB030329, SPM optical observations
  7. GRB 030329: Optical decay and synthesis
  8. GRB030329 optical observations
  9. GRB 030329: Optical pre-Imaging
  10. GRB 030329: Upper limit from 5.6 hours before trigger
  11. GRB030328: X-ray Afterglow Observed with Chandra
  12. GRB 030329, R-band observations
  13. GRB 030329: OT B and R photometry, decline rate
  14. GRB030329: Upper limits from recent and historical observations.
  15. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  16. GRB 030329: Optical Afterglow Observations
  17. GRB 030328: optical observations
  18. GRB 030329: Optical afterglow fading
  19. GRB 030328: OT photometry
  20. GRB030328: optical spectroscopy at TNG
  21. GRB030328: optical photometry at the TNG
  22. VLT spectra of GRB 030328
  23. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  24. GRB 030328: Optical observations
  25. GRB030324 optical observation
  26. GRB030131, BVRcIc field photometry
  27. Possible GRB030323 localized by INTEGRAL
  28. GRB030323: Detection on 2003/03/24
  29. IPN triangulation of GRB030326 (single small error box)
  30. IPN triangulation of GRB030325 (two small error boxes)
  31. GRB030323: V, R, I photometry
  32. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  33. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  34. VLT/FORS2 spectra of GRB 030323
  35. GRB030323, optical observations
  36. GRB030324, BVRcIc field photometry
  37. GRB030323, BVRcIc field calibration
  38. IPN triangulation of GRB030320 (small error box)
  39. Possible GRB 030320 localized by INTEGRAL
  40. IPN triangulation of GRB030306 (single small error box - REVISED)
  41. IPN triangulation of GRB030306 (single small error box)
  42. IPN triangulation of GRB030306 (two small error boxes)
  43. GRB030226, BVRc observations
  44. Chandra detection of the X-ray afterglow of GRB 030226
  45. GRB030227: Kiso optical upper limit
  46. GRB030227, BVRcIc field photometry
  47. GRB030226, BVRcIc field calibration
  48. GRB 030228, optical observations
  49. GRB 030227: Confirmed Optical Afterglow (S1-A)
  50. GRB 030227: fading of candidate optical afterglow 'S1-A'
  51. GRB030227:Optical observations
  52. GRB 030227, possible optical counterpart of XMM-Newton source
  53. GRB030227 - faint tentative OT candidate
  54. GRB 030226, optical observations
  55. XMM-Newton observation of GRB030227
  56. GRB030227: Kiso optical observations
  57. GRB 030227: Kyoto optical observation
  58. GRB 030226, optical light curve
  59. GRB030227 localized by INTEGRAL
  60. GRB 030226 : Predicted light curve
  61. GRB030226: ESI spectroscopy
  62. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  63. GRB 030226 simultaneous optical observations
  64. GRB 030226, optical observations
  65. GRB030226: Optical decay index
  66. GRB 030226 Optical Spectra and R,I,z' Imaging
  67. GRB: Non-Referencing of GCN Circulars.
  68. IPN triangulation of GRB030217 (small error box)
  69. GRB 030131: marginal optical detection
  70. GRB 030204: Optical Observations
  71. GRB030204 field photometry
  72. GRB020819: Kiso R and I band observations
  73. GRB030131: Candidate Optical Afterglow
  74. IPN triangulation of GRB030204 (small error box)
  75. GRB 030131, optical observations
  76. GRB 030131: afterglow candidate
  77. GRB 030115, late-time optical observations
  78. GRB030131: corrected INTEGRAL position
  79. GRB 020819: Host galaxy at Radio Position
  80. IPN triangulation of GRB030131
  81. GRB 030131 optical observations
  82. GRB 030131 optical observations
  83. A long GRB detected by INTEGRAL
  84. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  85. GRB 030115, simultaneous observations by BOOTES-1
  86. GRB 030115: IR observations with IRSF/SIRIUS
  87. IPN triangulation of GRB030115C (large error box)
  88. GRB030115, afterglow candidate
  89. GRB 021211: R-band observations at late-time
  90. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  91. GRB 030115 : Possible IR counterpart
  92. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  93. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  94. GRB 030115: APO Optical Observations
  95. Information about where HETE will be pointing
  96. VLT spectroscopy of the probable host of GRB 021211
  97. IPN triangulation of GRB030101 (two large error boxes)
  98. GRB 021211: Probable Host and Underlying Supernova
  99. GRB 021112: Evidence for Another Dark Optical Afterglow
  100. GRB 021219: OSN optical observations

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