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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"

27395 results found.

  1. GRB030329: XMM-Newton observation
  2. GRB 021004: HST observations
  3. GRB030324: Further Observations of the Candidate Optical Afterglow
  4. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  5. IPN triangulation of GRB030519B=H2716 (small error box)
  6. HETE GRB030329, correction to Rc Observations in Loiano
  7. GRB 030329: Optical limit (contemporaneous imaging)
  8. IPN triangulation of GRB030509 (small errror box)
  9. GRB030329, BVRI photometry
  10. GRB030429, refiend optical brightness
  11. GRB 030329: Optical limit (contemporaneous photography)
  12. GRB030418, BVRcIc field photometry
  13. GRB030429, BVRcIc field photometry
  14. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  15. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  16. GRB030329: RTT150 optical observations and upper limit for a host
  17. GRB030501, optical observation
  18. GRB030501 triangulation (correction to GCN 2194)
  19. GRB030329: RTT150 optical observations and upper limit for a host
  20. GRB 030429: redshift from VLT spectroscopy
  21. GRB030501B triangulation (single error box)
  22. GRB 030329, BVRI photometry
  23. GRB030429: Optical Observations
  24. GRB030501: TAROT candidate afterglow present in archival images
  25. GRB 030429: confirmation of afterglow candidate
  26. GRB 030329 Oprical observations in Rozhen observatory
  27. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  28. IPN triangulation of GRB030425 (single error box)
  29. GRB 030329, the review of the sky area in plate archive (1950-1998)
  30. GRB 030329: optical spectropolarimetry at VLT
  31. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  32. GRB030329: optical polarization
  33. IPN triangulation of GRB030422 (two large error boxes)
  34. GRB030329, optical observation
  35. MASTER:optical observations GRB030418
  36. MASTER:optical observations probable GRB030414
  37. GRB030418: Kiso near infrared observations
  38. GRB 030418: Optical afterglow
  39. OT GRB 030329: early UBVRcIc spectral evolution
  40. OT GRB 030329: early spectrum
  41. IPN triangulation of GRB030414 (small error box)
  42. IPN triangulation of GRB030413 (small error box)
  43. Superluminal motion in GRB 030329 (Correction)
  44. Superluminal motion in GRB 030329
  45. GRB030329, optical position
  46. IPN triangulation of GRB030406 (small error box)
  47. IPN triangulation of GRB050403 (small error box)
  48. GRB 030329: BVRI photometry at Asiago
  49. GRB 030329: VLT V-band photometry
  50. Kiso observation of the GRB030329 at April 6
  51. GRB 030329, color evolution
  52. GRB030328, UBVRcIc field photometry
  53. GRB 030329 Optical observations
  54. GRB030329: Kiso B and R band observations
  55. GRB030328: R upper limit after 6 hours by MASTER
  56. SDSS 0.5m PT observations of GRB030329 (correction)
  57. SDSS 0.5m PT observations of GRB030329
  58. GRB030329: final R-band light curve by MASTER
  59. GRB030329, optical observation
  60. GRB030329, new UBVRcIc field photometry
  61. GRB 030329, light curve and SN prediction
  62. GRB 030329, BRI photometry
  63. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  64. GRB030329: Optical observations at Teramo
  65. GRB 030329: Radio observations at GMRT
  66. Further AAVSO V,B,R observations of GRB030329
  67. GRB 030329: Additional Mt. Laguna Optical Observations
  68. GRB 030329: Observations with ANDICAM
  69. GRB030329: further optical photometry and evidence for a light curve discontinuity
  70. triangulation of GRB 030331 (single error box)
  71. GRB 030329: optical observations
  72. Photometry of GRB030329 - Constant OT Magnitude
  73. GRB030329 - OT brightens
  74. GRB 030329, optical photometry
  75. GRB 030324: Optical and NIR Observations
  76. GRB030329: R band light curve by MASTER
  77. GRB030329 - Light curve flattening
  78. GRB 030324, optical search
  79. GRB 030329, optical observations
  80. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  81. GRB030329a: detection by Konus-Wind
  82. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  83. GRB030329, BVRcIc field photometry
  84. GRB030329, SPM optical observations
  85. GRB 030329: Optical decay and synthesis
  86. GRB030329 optical observations
  87. GRB 030329: Optical pre-Imaging
  88. GRB 030329: Upper limit from 5.6 hours before trigger
  89. GRB030328: X-ray Afterglow Observed with Chandra
  90. GRB 030329, R-band observations
  91. GRB 030329: OT B and R photometry, decline rate
  92. GRB030329: Upper limits from recent and historical observations.
  93. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  94. GRB 030329: Optical Afterglow Observations
  95. GRB 030328: optical observations
  96. GRB 030329: Optical afterglow fading
  97. GRB 030328: OT photometry
  98. GRB030328: optical spectroscopy at TNG
  99. GRB030328: optical photometry at the TNG
  100. VLT spectra of GRB 030328

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