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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"

28089 results found.

  1. GRB 030329: Optical limit (contemporaneous imaging)
  2. IPN triangulation of GRB030509 (small errror box)
  3. GRB030329, BVRI photometry
  4. GRB030429, refiend optical brightness
  5. GRB 030329: Optical limit (contemporaneous photography)
  6. GRB030418, BVRcIc field photometry
  7. GRB030429, BVRcIc field photometry
  8. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  9. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  10. GRB030329: RTT150 optical observations and upper limit for a host
  11. GRB030501, optical observation
  12. GRB030501 triangulation (correction to GCN 2194)
  13. GRB030329: RTT150 optical observations and upper limit for a host
  14. GRB 030429: redshift from VLT spectroscopy
  15. GRB030501B triangulation (single error box)
  16. GRB 030329, BVRI photometry
  17. GRB030429: Optical Observations
  18. GRB030501: TAROT candidate afterglow present in archival images
  19. GRB 030429: confirmation of afterglow candidate
  20. GRB 030329 Oprical observations in Rozhen observatory
  21. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  22. IPN triangulation of GRB030425 (single error box)
  23. GRB 030329, the review of the sky area in plate archive (1950-1998)
  24. GRB 030329: optical spectropolarimetry at VLT
  25. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  26. GRB030329: optical polarization
  27. IPN triangulation of GRB030422 (two large error boxes)
  28. GRB030329, optical observation
  29. MASTER:optical observations GRB030418
  30. MASTER:optical observations probable GRB030414
  31. GRB030418: Kiso near infrared observations
  32. GRB 030418: Optical afterglow
  33. OT GRB 030329: early UBVRcIc spectral evolution
  34. OT GRB 030329: early spectrum
  35. IPN triangulation of GRB030414 (small error box)
  36. IPN triangulation of GRB030413 (small error box)
  37. Superluminal motion in GRB 030329 (Correction)
  38. Superluminal motion in GRB 030329
  39. GRB030329, optical position
  40. IPN triangulation of GRB030406 (small error box)
  41. IPN triangulation of GRB050403 (small error box)
  42. GRB 030329: BVRI photometry at Asiago
  43. GRB 030329: VLT V-band photometry
  44. Kiso observation of the GRB030329 at April 6
  45. GRB 030329, color evolution
  46. GRB030328, UBVRcIc field photometry
  47. GRB 030329 Optical observations
  48. GRB030329: Kiso B and R band observations
  49. GRB030328: R upper limit after 6 hours by MASTER
  50. SDSS 0.5m PT observations of GRB030329 (correction)
  51. SDSS 0.5m PT observations of GRB030329
  52. GRB030329: final R-band light curve by MASTER
  53. GRB030329, optical observation
  54. GRB030329, new UBVRcIc field photometry
  55. GRB 030329, light curve and SN prediction
  56. GRB 030329, BRI photometry
  57. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  58. GRB030329: Optical observations at Teramo
  59. GRB 030329: Radio observations at GMRT
  60. Further AAVSO V,B,R observations of GRB030329
  61. GRB 030329: Additional Mt. Laguna Optical Observations
  62. GRB 030329: Observations with ANDICAM
  63. GRB030329: further optical photometry and evidence for a light curve discontinuity
  64. triangulation of GRB 030331 (single error box)
  65. GRB 030329: optical observations
  66. Photometry of GRB030329 - Constant OT Magnitude
  67. GRB030329 - OT brightens
  68. GRB 030329, optical photometry
  69. GRB 030324: Optical and NIR Observations
  70. GRB030329: R band light curve by MASTER
  71. GRB030329 - Light curve flattening
  72. GRB 030324, optical search
  73. GRB 030329, optical observations
  74. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  75. GRB030329a: detection by Konus-Wind
  76. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  77. GRB030329, BVRcIc field photometry
  78. GRB030329, SPM optical observations
  79. GRB 030329: Optical decay and synthesis
  80. GRB030329 optical observations
  81. GRB 030329: Optical pre-Imaging
  82. GRB 030329: Upper limit from 5.6 hours before trigger
  83. GRB030328: X-ray Afterglow Observed with Chandra
  84. GRB 030329, R-band observations
  85. GRB 030329: OT B and R photometry, decline rate
  86. GRB030329: Upper limits from recent and historical observations.
  87. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  88. GRB 030329: Optical Afterglow Observations
  89. GRB 030328: optical observations
  90. GRB 030329: Optical afterglow fading
  91. GRB 030328: OT photometry
  92. GRB030328: optical spectroscopy at TNG
  93. GRB030328: optical photometry at the TNG
  94. VLT spectra of GRB 030328
  95. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  96. GRB 030328: Optical observations
  97. GRB030324 optical observation
  98. GRB030131, BVRcIc field photometry
  99. Possible GRB030323 localized by INTEGRAL
  100. GRB030323: Detection on 2003/03/24

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