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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

27321 results found.

  1. GRB 030324: Optical and NIR Observations
  2. GRB030329: R band light curve by MASTER
  3. GRB030329 - Light curve flattening
  4. GRB 030324, optical search
  5. GRB 030329, optical observations
  6. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  7. GRB030329a: detection by Konus-Wind
  8. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  9. GRB030329, BVRcIc field photometry
  10. GRB030329, SPM optical observations
  11. GRB 030329: Optical decay and synthesis
  12. GRB030329 optical observations
  13. GRB 030329: Optical pre-Imaging
  14. GRB 030329: Upper limit from 5.6 hours before trigger
  15. GRB030328: X-ray Afterglow Observed with Chandra
  16. GRB 030329, R-band observations
  17. GRB 030329: OT B and R photometry, decline rate
  18. GRB030329: Upper limits from recent and historical observations.
  19. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  20. GRB 030329: Optical Afterglow Observations
  21. GRB 030328: optical observations
  22. GRB 030329: Optical afterglow fading
  23. GRB 030328: OT photometry
  24. GRB030328: optical spectroscopy at TNG
  25. GRB030328: optical photometry at the TNG
  26. VLT spectra of GRB 030328
  27. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  28. GRB 030328: Optical observations
  29. GRB030324 optical observation
  30. GRB030131, BVRcIc field photometry
  31. Possible GRB030323 localized by INTEGRAL
  32. GRB030323: Detection on 2003/03/24
  33. IPN triangulation of GRB030326 (single small error box)
  34. IPN triangulation of GRB030325 (two small error boxes)
  35. GRB030323: V, R, I photometry
  36. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  37. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  38. VLT/FORS2 spectra of GRB 030323
  39. GRB030323, optical observations
  40. GRB030324, BVRcIc field photometry
  41. GRB030323, BVRcIc field calibration
  42. IPN triangulation of GRB030320 (small error box)
  43. Possible GRB 030320 localized by INTEGRAL
  44. IPN triangulation of GRB030306 (single small error box - REVISED)
  45. IPN triangulation of GRB030306 (single small error box)
  46. IPN triangulation of GRB030306 (two small error boxes)
  47. GRB030226, BVRc observations
  48. Chandra detection of the X-ray afterglow of GRB 030226
  49. GRB030227: Kiso optical upper limit
  50. GRB030227, BVRcIc field photometry
  51. GRB030226, BVRcIc field calibration
  52. GRB 030228, optical observations
  53. GRB 030227: Confirmed Optical Afterglow (S1-A)
  54. GRB 030227: fading of candidate optical afterglow 'S1-A'
  55. GRB030227:Optical observations
  56. GRB 030227, possible optical counterpart of XMM-Newton source
  57. GRB030227 - faint tentative OT candidate
  58. GRB 030226, optical observations
  59. XMM-Newton observation of GRB030227
  60. GRB030227: Kiso optical observations
  61. GRB 030227: Kyoto optical observation
  62. GRB 030226, optical light curve
  63. GRB030227 localized by INTEGRAL
  64. GRB 030226 : Predicted light curve
  65. GRB030226: ESI spectroscopy
  66. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  67. GRB 030226 simultaneous optical observations
  68. GRB 030226, optical observations
  69. GRB030226: Optical decay index
  70. GRB 030226 Optical Spectra and R,I,z' Imaging
  71. GRB: Non-Referencing of GCN Circulars.
  72. IPN triangulation of GRB030217 (small error box)
  73. GRB 030131: marginal optical detection
  74. GRB 030204: Optical Observations
  75. GRB030204 field photometry
  76. GRB020819: Kiso R and I band observations
  77. GRB030131: Candidate Optical Afterglow
  78. IPN triangulation of GRB030204 (small error box)
  79. GRB 030131, optical observations
  80. GRB 030131: afterglow candidate
  81. GRB 030115, late-time optical observations
  82. GRB030131: corrected INTEGRAL position
  83. GRB 020819: Host galaxy at Radio Position
  84. IPN triangulation of GRB030131
  85. GRB 030131 optical observations
  86. GRB 030131 optical observations
  87. A long GRB detected by INTEGRAL
  88. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  89. GRB 030115, simultaneous observations by BOOTES-1
  90. GRB 030115: IR observations with IRSF/SIRIUS
  91. IPN triangulation of GRB030115C (large error box)
  92. GRB030115, afterglow candidate
  93. GRB 021211: R-band observations at late-time
  94. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  95. GRB 030115 : Possible IR counterpart
  96. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  97. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  98. GRB 030115: APO Optical Observations
  99. Information about where HETE will be pointing
  100. VLT spectroscopy of the probable host of GRB 021211

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