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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"

28090 results found.

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

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