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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"

35448 results found.

  1. GRB 021206, Radio afterglow candidate
  2. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  3. IPN triangulation of GRB030607 (annulus)
  4. IPN triangulation of GRB030606 (two alternate error boxes)
  5. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  6. IPN triangulation of GRB030605B (annulus)
  7. GRB 030528: Optical Observations
  8. IPN triangulation of GRB030605 (annulus)
  9. GRB 030528: tentative NIR counterpart
  10. GRB 030528, radio observations
  11. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  12. GRB030329, further radio observations at GMRT
  13. GRB030528, BVRI field photometry
  14. IPN triangulation of GRB030601 (annulus)
  15. GRB030528: Chandra TOO Planned
  16. GRB 030519B: optical observations.
  17. GRB 030329: optical observations
  18. GRB 030329/SN 2003dh: Jitter Episode
  19. GRB 030528, Teramo optical observation
  20. GRB 030528 Bisei optical observation
  21. GRB030528 (H2724): A long GRB localized by HETE
  22. GRB 030329: Correction to GCN 2254
  23. GRB 030329: Optical Observations
  24. GRB 030528: Optical observations at RIKEN
  25. GRB 030528 (=H2724) Kyoto optical observation
  26. IPN triangulation of GRB030523B (annulus)
  27. GRB 030416: Optical Observations
  28. GRB 030329: Planned XMM-Newton Observation
  29. IPN triangulation of GRB030523 (annulus)
  30. GRB 030329: optical photometry at various french observatories
  31. GRB 030329: optical photometry at Belesta observatory (France)
  32. GRB 030329/SN 2003dh: Possible increase in brightness
  33. GRB 030329: HST ACS Observations of the Host
  34. GRB 030329 Optical Observations
  35. GRB 021004: HST observations
  36. GRB030324: Further Observations of the Candidate Optical Afterglow
  37. IPN triangulation of GRB030519B=H2716 (small error box)
  38. GRB 030418: Second Epoch Optical Observations with Magellan
  39. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  40. IPN triangulation of GRB030519 (annulus)
  41. IPN triangulation of GRB030518C (annulus)
  42. IPN triangulation of GRB030518B (annulus)
  43. IPN triangulation of GRB030518A (annulus)
  44. IPN triangulation of GRB030514 (annulus)
  45. IPN triangulation of GRB030513 (annulus)
  46. IPN triangulation of GRB030509B (annulus)
  47. GRB 030329: Optical limit (contemporaneous imaging)
  48. GRB 030501: final TAROT limits
  49. IPN triangulation of GRB030509 (small errror box)
  50. IPN triangulation of GRB030509 - correction
  51. IPN triangulation of GRB030509 (single error box)
  52. GRB030329: RTT150 optical observations
  53. GRB 030329: Optical limit (contemporaneous photography)
  54. GRB030418, BVRcIc field photometry
  55. GRB 030429: Redshift of neighbor galaxy
  56. GRB030429, BVRcIc field photometry
  57. GRB 030329: High-Resolution Spectroscopy of the Host
  58. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  59. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  60. GRB030429: RTT150 optical observations, a possible host galaxy
  61. IPN triangulation of GRB030506 (annulus)
  62. IPN triangulation of GRB030505B (large error box)
  63. IPN triangulation of GRB030505A (annulus)
  64. GRB030329: RTT150 optical observations and upper limit for a host
  65. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  66. GRB030501, optical observation
  67. GRB030501C triangulation (annulus)
  68. GRB030329: RTT150 optical observations and upper limit for a host
  69. GRB 030429: Radio Observations
  70. GRB 030429: redshift from VLT spectroscopy
  71. GRB 030429: IR photometry with IRSF/SIRIUS
  72. GRB030501B triangulation (single error box)
  73. GRB 030329 Optical Observations
  74. GRB 030329, BVRI photometry
  75. GRB 030501: TAROT possible candidate counterpart
  76. IPN triangulation of GRB030501 (IBIS event; annulus)
  77. IPN triangulation of GRB030501B (annulus)
  78. GRB 030429: confirmation of afterglow candidate
  79. GRB030429, possible optical counterpart
  80. GRB030501 localized by INTEGRAL
  81. GRB030425: CrAO optical observation
  82. IPN triangulation of GRB030429 (annulus)
  83. IPN triangulation of GRB030428 (two large error boxes)
  84. GRB 030329 Oprical observations in Rozhen observatory
  85. GRB 030429: ROTSE-III observations
  86. GRB 030324: Radio Observations
  87. GRB030329 observed as a sudden ionospheric disturbance (SID)
  88. IPN triangulation of GRB030426 (annulus)
  89. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  90. IPN triangulation of GRB030425 (single error box)
  91. GRB 030329, the review of the sky area in plate archive (1950-1998)
  92. GRB 030329: Spectral Evolution of SN 2003dh
  93. Optical Observations of GRB 030418 with Magellan
  94. GRB 030329: optical spectropolarimetry at VLT
  95. IPN triangulation of GRB030422C (annulus)
  96. IPN triangulation of GRB030422B (annulus)
  97. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  98. GRB030329: optical polarization
  99. IPN triangulation of GRB030422 (two large error boxes)
  100. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope

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