Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. See news and announcements

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"

20557 results found.

  1. Konus-Wind detection of the bursts from SGR1806-20 region
  2. SGR 1806-20, submm observations
  3. RXTE PCA Observations of SGR1806-20 Region
  4. GRB030329: RTT150 optical observations
  5. GRB030329, optical observation in May
  6. GRB030418: R optical observations
  7. GRB 021206, Radio afterglow candidate
  8. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  9. GRB030329, SPM optical observations (Correction of GCN2075 R band)
  10. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  11. GRB 030528: Optical Observations
  12. GRB 030528, radio observations
  13. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  14. GRB030329, further radio observations at GMRT
  15. GRB030329, SPM optical observations
  16. GRB030528: Chandra TOO Planned
  17. GRB 030519B: optical observations.
  18. MASTER: optical observation GRB030601
  19. GRB 030329: optical observations
  20. GRB 030329/SN 2003dh: Jitter Episode
  21. GRB 030329: Optical Observations
  22. GRB 030528: Optical observations at RIKEN
  23. GRB 030416: Optical Observations
  24. GRB030329, Optical observations
  25. GRB 030329/SN 2003dh: Possible increase in brightness
  26. GRB 030329: HST ACS Observations of the Host
  27. GRB 030329 Optical Observations
  28. GRB030329: XMM-Newton observation
  29. GRB 021004: HST observations
  30. GRB030324: Further Observations of the Candidate Optical Afterglow
  31. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  32. GRB 030418: Second Epoch Optical Observations with Magellan
  33. HETE GRB030329, correction to Rc Observations in Loiano
  34. GRB030329: RTT150 optical observations
  35. GRB030329, BVRI photometry
  36. GRB 030429: Redshift of neighbor galaxy
  37. GRB 030329: High-Resolution Spectroscopy of the Host
  38. GRB030429: RTT150 optical observations, a possible host galaxy
  39. GRB030329: RTT150 optical observations and upper limit for a host
  40. GRB030501, optical observation
  41. GRB030329: RTT150 optical observations and upper limit for a host
  42. GRB 030429: Radio Observations
  43. GRB 030429: IR photometry with IRSF/SIRIUS
  44. GRB 030329 Optical Observations
  45. GRB030429: Optical Observations
  46. GRB 030501: TAROT possible candidate counterpart
  47. GRB 030429: confirmation of afterglow candidate
  48. GRB030429, possible optical counterpart
  49. GRB 030329 Oprical observations in Rozhen observatory
  50. GRB 030429: ROTSE-III observations
  51. GRB 030324: Radio Observations
  52. GRB030329 observed as a sudden ionospheric disturbance (SID)
  53. GRB030329, SPM optical observations (Correction)
  54. GRB030329, SPM optical observations
  55. GRB 030329, the review of the sky area in plate archive (1950-1998)
  56. Optical Observations of GRB 030418 with Magellan
  57. GRB 030329: optical spectropolarimetry at VLT
  58. GRB030329: optical polarization
  59. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  60. MASTER:optical observations GRB030418
  61. MASTER:optical observations probable GRB030414
  62. GRB030329: 444 AAVSO Measurements
  63. MASTER:optical observations GRB030416
  64. ROTSE-III prompt optical detections of GRB 030418
  65. GRB030418: Upper limits from recent and historical observations.
  66. GRB030418: Kiso near infrared observations
  67. GRB 030418: Optical afterglow
  68. GRB 030418: Optical afterglow candidate
  69. GRB030329: Optical Observations
  70. OT GRB 030329: early UBVRcIc spectral evolution
  71. GRB030329, UBVRI polarimetry, R-polarization
  72. GRB 030329: SARA Optical Observations
  73. OT GRB 030329: early spectrum
  74. GRB030329: VR Photometry at TNG
  75. GRB030324: Candidate Optical Afterglow
  76. GRB 030413: Optical Observations
  77. GRB 030329 Rc observations
  78. GRB 030329 VLBA Observations
  79. GRB 030329: VLT V-band photometry
  80. GRB030329: RTT150 optical observations
  81. GRB030329: Near Infrared Observations at Gunma
  82. GRB030329: HET spectroscopic monitoring
  83. Kiso observation of the GRB030329 at April 6
  84. GRB030329: Optical observcations
  85. GRB030329: BV photographic observations
  86. GRB 030329 Optical observations
  87. GRB 030329, color evolution
  88. GRB030329: RTT150 optical observations
  89. GRB 030329: Supernova Spectrum Emerging
  90. GRB030329: Kiso B and R band observations
  91. GRB030329: RTT150 optical observation
  92. GRB030329: More AAVSO VR obs
  93. GRB030328: R upper limit after 6 hours by MASTER
  94. GRB 030329: BV photographic observations
  95. GRB 030329: SARA Optical Observations
  96. GRB 030329: SARA Optical Observations
  97. GRB030329: Optical observations
  98. SDSS 0.5m PT observations of GRB030329 (correction)
  99. SDSS 0.5m PT observations of GRB030329
  100. GRB 030329, Optical observations

Advanced

Download all Circulars as a .tar.gz archive:
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov