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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"

27394 results found.

  1. GRB 021004: HST observations
  2. GRB030324: Further Observations of the Candidate Optical Afterglow
  3. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  4. IPN triangulation of GRB030519B=H2716 (small error box)
  5. HETE GRB030329, correction to Rc Observations in Loiano
  6. GRB 030329: Optical limit (contemporaneous imaging)
  7. IPN triangulation of GRB030509 (small errror box)
  8. GRB030329, BVRI photometry
  9. GRB030429, refiend optical brightness
  10. GRB 030329: Optical limit (contemporaneous photography)
  11. GRB030418, BVRcIc field photometry
  12. GRB030429, BVRcIc field photometry
  13. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  14. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  15. GRB030329: RTT150 optical observations and upper limit for a host
  16. GRB030501, optical observation
  17. GRB030501 triangulation (correction to GCN 2194)
  18. GRB030329: RTT150 optical observations and upper limit for a host
  19. GRB 030429: redshift from VLT spectroscopy
  20. GRB030501B triangulation (single error box)
  21. GRB 030329, BVRI photometry
  22. GRB030429: Optical Observations
  23. GRB030501: TAROT candidate afterglow present in archival images
  24. GRB 030429: confirmation of afterglow candidate
  25. GRB 030329 Oprical observations in Rozhen observatory
  26. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  27. IPN triangulation of GRB030425 (single error box)
  28. GRB 030329, the review of the sky area in plate archive (1950-1998)
  29. GRB 030329: optical spectropolarimetry at VLT
  30. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  31. GRB030329: optical polarization
  32. IPN triangulation of GRB030422 (two large error boxes)
  33. GRB030329, optical observation
  34. MASTER:optical observations GRB030418
  35. MASTER:optical observations probable GRB030414
  36. GRB030418: Kiso near infrared observations
  37. GRB 030418: Optical afterglow
  38. OT GRB 030329: early UBVRcIc spectral evolution
  39. OT GRB 030329: early spectrum
  40. IPN triangulation of GRB030414 (small error box)
  41. IPN triangulation of GRB030413 (small error box)
  42. Superluminal motion in GRB 030329 (Correction)
  43. Superluminal motion in GRB 030329
  44. GRB030329, optical position
  45. IPN triangulation of GRB030406 (small error box)
  46. IPN triangulation of GRB050403 (small error box)
  47. GRB 030329: BVRI photometry at Asiago
  48. GRB 030329: VLT V-band photometry
  49. Kiso observation of the GRB030329 at April 6
  50. GRB 030329, color evolution
  51. GRB030328, UBVRcIc field photometry
  52. GRB 030329 Optical observations
  53. GRB030329: Kiso B and R band observations
  54. GRB030328: R upper limit after 6 hours by MASTER
  55. SDSS 0.5m PT observations of GRB030329 (correction)
  56. SDSS 0.5m PT observations of GRB030329
  57. GRB030329: final R-band light curve by MASTER
  58. GRB030329, optical observation
  59. GRB030329, new UBVRcIc field photometry
  60. GRB 030329, light curve and SN prediction
  61. GRB 030329, BRI photometry
  62. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  63. GRB030329: Optical observations at Teramo
  64. GRB 030329: Radio observations at GMRT
  65. Further AAVSO V,B,R observations of GRB030329
  66. GRB 030329: Additional Mt. Laguna Optical Observations
  67. GRB 030329: Observations with ANDICAM
  68. GRB030329: further optical photometry and evidence for a light curve discontinuity
  69. triangulation of GRB 030331 (single error box)
  70. GRB 030329: optical observations
  71. Photometry of GRB030329 - Constant OT Magnitude
  72. GRB030329 - OT brightens
  73. GRB 030329, optical photometry
  74. GRB 030324: Optical and NIR Observations
  75. GRB030329: R band light curve by MASTER
  76. GRB030329 - Light curve flattening
  77. GRB 030324, optical search
  78. GRB 030329, optical observations
  79. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  80. GRB030329a: detection by Konus-Wind
  81. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  82. GRB030329, BVRcIc field photometry
  83. GRB030329, SPM optical observations
  84. GRB 030329: Optical decay and synthesis
  85. GRB030329 optical observations
  86. GRB 030329: Optical pre-Imaging
  87. GRB 030329: Upper limit from 5.6 hours before trigger
  88. GRB030328: X-ray Afterglow Observed with Chandra
  89. GRB 030329, R-band observations
  90. GRB 030329: OT B and R photometry, decline rate
  91. GRB030329: Upper limits from recent and historical observations.
  92. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  93. GRB 030329: Optical Afterglow Observations
  94. GRB 030328: optical observations
  95. GRB 030329: Optical afterglow fading
  96. GRB 030328: OT photometry
  97. GRB030328: optical spectroscopy at TNG
  98. GRB030328: optical photometry at the TNG
  99. VLT spectra of GRB 030328
  100. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC

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